Higher boost and E85 or Methanol
Higher boost and E85 or Methanol
(OP)
I have a mazdaspeed 3 with a built motor and a Garrett 3076 turbo. the engine is 2.4L Direct injection, and holds a fuel rail pressure at 1800 psi kind of like a diesel just not as extreme. I have 9.5:1 compression.
I want to run 400WHP Daily driver but this engine runs on 93 octane pump gas and I am spraying a 7 Gallon per hour nozzle of 50% Methanol and 50% Water into my intercooler piping about 16 inches before my throttle body.
My EGT reads about 1200 F at WOT and i run about 11.6-11.9 AFR. The turbo is flowing about 350 Grams/second of air. at 22PSI at 6k rpm. I am getting some engine knock and am very concerned about tuning the timing higher and not catching damage to the engine. I want to beat on it every day as safely as i can and i have a fully built motor so between the 93 octane gas with spraying methanol it should be enough but I don't feel it is and i do not want to spray more its terribly difficult to introduce the extra mixture of fuel into the intake tract and i cannot program the ECU to read it, it can only compensate.
The MAIN Question: E85 is NOT available around me, 99.9% methanol is available. 106 octane is available but costs way too much for daily driver. Should i just start putting Methonal in my gas tank with the 93 octane because i cant buy E85 ? what other options are there. I want to go up to 26-28 PSI and I want a more solid solution then trying to spray so much alcohol.
And What AFR Would be good for this application
*(please remember I am direct injected and my AFR runs a tad higher then the conventional port/intake manifold injections that have time to atomize pre cylinders and dont require so much fuel pressure, and have more time to spray)
I want to run 400WHP Daily driver but this engine runs on 93 octane pump gas and I am spraying a 7 Gallon per hour nozzle of 50% Methanol and 50% Water into my intercooler piping about 16 inches before my throttle body.
My EGT reads about 1200 F at WOT and i run about 11.6-11.9 AFR. The turbo is flowing about 350 Grams/second of air. at 22PSI at 6k rpm. I am getting some engine knock and am very concerned about tuning the timing higher and not catching damage to the engine. I want to beat on it every day as safely as i can and i have a fully built motor so between the 93 octane gas with spraying methanol it should be enough but I don't feel it is and i do not want to spray more its terribly difficult to introduce the extra mixture of fuel into the intake tract and i cannot program the ECU to read it, it can only compensate.
The MAIN Question: E85 is NOT available around me, 99.9% methanol is available. 106 octane is available but costs way too much for daily driver. Should i just start putting Methonal in my gas tank with the 93 octane because i cant buy E85 ? what other options are there. I want to go up to 26-28 PSI and I want a more solid solution then trying to spray so much alcohol.
And What AFR Would be good for this application
*(please remember I am direct injected and my AFR runs a tad higher then the conventional port/intake manifold injections that have time to atomize pre cylinders and dont require so much fuel pressure, and have more time to spray)





RE: Higher boost and E85 or Methanol
If you're knock limited now and you want more power without more knock, you will have to impose measures to increase knock margin, as you are contemplating. The path to more power is more boost pressure, as this results in more air available for combustion. To mitigate knock due to increased boost pressure, you have available the options of:
-higher octane fuel
-lower AFR (to a point, probably around 10:1 or equivalent, if fuel is not gasoline)
-more effective intercooling, if feasible
-retarding spark timing (to a point, EGT may become a limiting factor, but you would have to measure it pre-turbo to know).
-water or water-methanol injection (to a point, where combustion becomes unstable)
These measures will actually work best in combination. The only ones you can't overdo are higher octane and better intercooling.
I wouldn't add methanol to your tank unless you know your fuel system is methanol-ready, and can tune your application for the change in AFR, and accurately control the ratio of methanol to gasoline accordingly when you add the methanol.
Also, I'd advise you, if you don't know already, to evaluate your fuel system's ability to deliver the extra fuel needed to match the extra air you want to add, especially if you choose to put a less energy dense fuel (e.g. methanl-gasoline mixture) in your tank.
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
and what are all the options for raising octane rating. For my application i should stick to spraying 50% water ? or maybe more water or more methanol
RE: Higher boost and E85 or Methanol
my EGT sensor is about 14" AFTER the Turbine/Turbo in my Downpipe.
RE: Higher boost and E85 or Methanol
EGT 14" after the turbo doesn't tell you much about what's going on with the temperature limited components, e.g. exhaust valves, exhaust manifold, turbine & turbine housing.
Not possible to guess ideal AFR over the interet. Too many variables. I would suggest 10.0 and 12.0 as WOT tuning limits, for an aggressive power goal as you have.
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
Adding methanol to the fuel has several benefits - higher octane, reduced AFR sensitivity (you can run a lot more excess fuel), better charge cooling. Mixing can be problematic. A little moisture absorption (methanol is highly hygroscopic) and it won't mix with gasolene. Adding up to 5% acetone will help. Methanol flow requirement is more than double what you need for gasolene ie 20% methanol blend requires 20% increase in fuel flow.
Engineering is the art of creating things you need, from things you can get.
RE: Higher boost and E85 or Methanol
isn't acetone corrosive or highly highly volatile and extremely expensive like a gallon is 20$ ?
RE: Higher boost and E85 or Methanol
Acetone is not corrosive as such like methanol which attacks metals, especially aluminium, however acetone is an aggressive solvent for many polymers including many plastic and rubber bits that resist petrol and even methanol.
Methanol is considerably more aggressive than ethanol and I would not presume an E85 ready system will handle the chemical attack or increased volume of fuel required for methanol. The extra volume of fuel is enough so that even tank vents need to be considerably bigger.
Regards
Pat
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RE: Higher boost and E85 or Methanol
The latent heat of vaporization from the water/alcohol injection remains constant no matter where you inject it, but the inter cooler is more efficient at higher charge temperature so if you inject the water/alcohol after the inter cooler you get a lower ultimate charge temperature which gives maximum suppression to knock.
Water/alcohol that lays in the inter cooler in liquid form can cause corrosion and inhibit air flow.
Regards
Pat
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RE: Higher boost and E85 or Methanol
Methanol is much more corrosive, as already mentioned. However, the bigger problem is elastomers and plastics. Methanol will cause typical fluorocarbon o-rings & seals to swell over 100%. It will also permeate nylons.
I would expect your inter cooler already has substantial corrosion from your 50/50 water methanol spray.
RE: Higher boost and E85 or Methanol
When i installed the methanol kit i read all the possible mounting locations and this proved to be the best place, just enough space to mix with the air but not lose its cooling properties before hitting cylinders.
If I spray CO2 or NOS on the inter cooler and cool the air charge quite a bit that wont help my knock but might make it worse right? the colder air will just make more power and not help cool anything ? I know it adds about 20 WHP, but wont help knock ?
There is a Dual purpose for my car to have methanol. From factory the car is Direct injected meaning NO fuel goes through my intake system at all but there are 2 PCV systems that feed fumes and oil and gunk all through my intake manifold and valves and also a EGR that feeds exhaust through here as well, so there is NOTHING coming through to clean all that carbon and oil and crap build up in the entire intake tract. it looks like a sewer in there normally, i need the methanol to clean it.
RE: Higher boost and E85 or Methanol
15 May 11 23:28
To add to hemi's list for mitigating knock - reduce CR.
Adding methanol to the fuel has several benefits - higher octane, reduced AFR sensitivity (you can run a lot more excess fuel), better charge cooling. Mixing can be problematic. A little moisture absorption (methanol is highly hygroscopic) and it won't mix with gasolene. Adding up to 5% acetone will help. Methanol flow requirement is more than double what you need for gasolene ie 20% methanol blend requires 20% increase in fuel flow. "
What is CR
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
Assume the IC is air/air, maybe water/air would have greater cooling capacity, depends what you can fit.
Exhaust cutout or other means to reduce backpressure. Slightly cooler thermostat. The usual stuff.
RE: Higher boost and E85 or Methanol
MORE INFO: to satisfy if your wondering about turbo capabilities, one time i had the manual boost controller i no longer use in my setup backwards and the restrictor pill was backwards in the wastegate setup and the turbo was spiking to 32 psi before letting back down to the 14psi spring pressure i had in the waste gate at the time. thank god i had built the motor with chromolly billet rods and the wiseco pistons Or i woulda lost my motor.
Now to Further my Flow capabilities I can completely read my Temperatures of Air charge at the inlet of the intake system and the Boosted air temps and with the methanol my boosted temps are 60-70F. Without the alcohol the temps run in the 95-100's. I live in Tampa Florida its extremely hot and humid here.
QUESTION: I have been wondering about water/air intercooling and what i want to know is is there a way to daily drive like this. my fabricator uses them in his 1000HP car at the track but he uses ice water i think and only for track running the car is for of course and he only speaks spanish so its hard to talk to him. my questions is how does it work internally and will it be beneficial to use this with regular water daily, will it get too hot after driving a bit and not be beneficial anymore or can i get one and empty it for daily use and then when im gonna race fill it up with cold water ?
RE: Higher boost and E85 or Methanol
It's just a closed loop cooling system. Daily driving, should stay within 10* of ambient temp.
Yes, add ice at the track if you want. This is a major benefit of using water/air. Adding "cold water" will not do anything for you. Ask your fabricator how many lbs of ice he melts in one run.
Re: turbo selection, plot it on the compressor map and make sure you're in the right place. Efficiency depends on flow and pressure ratio.
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
Agreed, Pat. My aSSumption was that the OP was considering blending moderate amounts of methanol, but not anywhere near M85.
I also aSSume that the OEMs, when they harden a fuel system for E85, overdo things a bit, for the sake of warranty avoidance. And, US OEMs at least, have had experience with M85 in the 80's & 90's (ah, the good old days, M85 at the pump, in California at least), and I expect, though I don't know, that the lessons learned then are now being applied to E85.
Gruntguru, you are quite right, CR is a very important knob in the quest for increased supercharged horsepower. Since the OP has already "built" his motor, I left that out of my list of post-build tuning measures.
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
I did However put a 5 layer cometic metal gasket instead of the factory 2 layer piece of crap to raise the CR a small tad.
I estimate I am flirting with 400 Wheel Horsepower.
RE: Higher boost and E85 or Methanol
If the gasket you installed was thicker than the factory gasket, then, all else being equal, the CR was reduced as a result.
If the 5 layer gasket is actually thinner than the factory gasket, and you knew this when you installed it, and at the same time you were seeking significantly more power through higher boost, then you were shooting yourself in the foot.
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
Reduced dome height on the piston or a deeper small dia dish of increased volume close to the spark plug at TDC is a much more effective route in my opinion. Later closing of the inlet valve may also help, depending on where it already is and unless you increase duration, later closing is also later opening which may be counterproductive.
Regards
Pat
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RE: Higher boost and E85 or Methanol
And I'll say it again. NOBODY is designing OE fuel systems with methanol compatibility in mind. It might take awhile for the problems to manifest themselves, but they will.
RE: Higher boost and E85 or Methanol
how about octane booster how many bottles can i add and what brand.
how many bottles would it take to get to 100 octane on 12 gallons.
RE: Higher boost and E85 or Methanol
Glad you gave up on the methanol...I ruined a nice pair of carbs, even with acetone/gasoline flush.
Agree 100%, Pat. In addition, a thicker head gasket can limit the ability of the fire ring to seal the combustion chamber without resorting to "O" ringing the block. Old school stuff that I have not done in a while, even on high boost and 16:1 CR engines.
I chased similar problems when building an all out 2.3 Turbocoupe in the early 80's. Managed 290hp at the wheels on pump gas, but more was probably available with today's technology. At some point you are just going to need to go to the higher octane fuel if you wish to continue power increases. It's expensive, but considering your goals, I think it's just about the cheapest trick left to you.
Rod
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
FWIW, I fully concur with my learned colleagues above on quench, chamber shape, and thick headgaskets. I'll defer to dgallup on the subject of gasoline diluted with methanol, as he seems to be more connected with that aspect of the industry than myself.
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
you wont believe the crap i have endured on the forum specific to my car platform everyone is a bunch of jerks and instead of answering my questions about tuning they flame me for asking the questions and not reading the entire internet. I know how to research things and apply them but sometimes the information is platform specific and cannot be had simply by reading, for not everything applies to your applications. Thus the only and best place to inquire about my car and the software i specifically use to tune can only be answered by this group of people where only a small amount really know how to answer my question and the ones who dont just talk junk.
you would think i would get more support going the route i have taken to build a motor and go for higher power which noone has truly broken 500WHP on this car because its soo hard to do.
RE: Higher boost and E85 or Methanol
Look at other DI engines of similar displacement (Cobalt SS for example)
RE: Higher boost and E85 or Methanol
what temperature is considered dangerous ?
RE: Higher boost and E85 or Methanol
Mike Halloran
Pembroke Pines, FL, USA
RE: Higher boost and E85 or Methanol
how about octane booster how many bottles can i add and what brand.
how many bottles would it take to get to 100 octane on 12 gallons."
If you are thinking of spending that much money there is an obvious solution to all your problems. Go talk to a supplier of racing fuel (VP or such) and select a fuel to do the job.
Engineering is the art of creating things you need, from things you can get.
RE: Higher boost and E85 or Methanol
I dont know what form they are selling it in, but any ideas of what form it is in, and what do i need to mix it with if its pure.
RE: Higher boost and E85 or Methanol
Now I'm not sure if the wieseco pistons have this moulding but it will be very beneficial. The other thing to note is that there will be huge amounts of fuel at the outer edges of the chamber meaning squish bands will be highly useful in reducing knock(which you have reduced by using a lower comp headgasket).
The only way from here IMO is to modify the manifold to use 4 extra injecotrs and use both port and DI injectors. Then you can add methanol or E85 or whatever on the port injecotrs. I definately wouldnt be using methanol or e85 with those HP pumps.
RE: Higher boost and E85 or Methanol
I could always add 4 separate alcohol injectors in each of the 4 runners in front of valves, and with that I could plug off the existing nozzle because it would be too big. I dont know but if we can spray it safely the way me and many others have i could just spray more and make it capable of flowing enough for what i need
Now for you guys to come correct me and tell me why this wont work I am listening. and I also ask if I do it this way I wont need acetone right ? it will mix when compressed in cylinder or as well might even evaporate from heat well before cylinders ??
RE: Higher boost and E85 or Methanol
So even tho my new head gasket is more stff and more like metal vs the flimsy factory gasket its bad ?
RE: Higher boost and E85 or Methanol
If you want to use that gasket you need to take the extra thickness off the top of the block so the piston to head clearance remains as the factory set it or just maybe a little tighter even is better.
To reduce compression, increase the depth of the dish in the piston. Do not increase the dia of the dish without very careful consideration of where it gets close to the head and what that does to turbulence from the squish as the piston approaches the head.
You can run any fuel you like as a supplementary through a separate system so long as that system is designed for that fuel.
Can you tune the ECU on the OEM system.
Can you replace the OEM ecu with something like a a Motec.
If you must use the stock OEM system and a supplementary system, an MFI system as the secondary might be possible. Something like those made by Enderely or Kinsler or Hilborne. They are simple and reliable and dead easy to tune once you understand how they work, although they have zero self correction for anything and as a supplementary rather than as a stand alone, you would be pioneering new ground.
If the OEM will fuel as though the engine is std and not self correct to a point, you can add extra fuel to match extra airflow the OEM won't recognise via a purely mechanical system, however it will only like WOT or closed throttle operation.
For a DD the transition from OEM only on part throttle to MFI implementation on boost will be real tricky to work out.
If I used supplementary MFI, I would use it with methanol.
Regards
Pat
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RE: Higher boost and E85 or Methanol
http://www.100ll.com/)
Add it to your street gas at 20%, ie 1 qt to a gallon of 93 octane auto fuel. There's enough lead in it (even at it's "low Lead" status) to raise your "streetable" octane. Avoid the temptation to run the car on straight avgas, even if you can afford it. It's the combination of the octane improvers in the auto gas, combined with the small amount of lead from the avgas that does the trick. Remember also, that the avgas has no road tax on it. Usual disclaimers apply.
RE: Higher boost and E85 or Methanol
Even if yo take it off and only fit it for inspection, lead in the system will wash through for weeks even when running only unleaded.
Regards
Pat
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RE: Higher boost and E85 or Methanol
So what does leaded mean for gas ? and how high will this raise my octane by mixing it, will it be better then buying 106 octane race fuel from sonoco ?
i always leaded meant it would damage internals of the engine.
RE: Higher boost and E85 or Methanol
Do yourself a favor and just go buy a few hundred dollars of dedicated race fuel before you break one or more multi thousand dollar bits and pieces. Advice from one who has BTDT all too many times in the search of 'savings'. The project looks like just that, a project. No one in his right mind drives a machine as you are building on the street.....Well, almost no one, mea culpa!!!
Rod
RE: Higher boost and E85 or Methanol
I change the charts then the device flashes the entire ecu with the new parameters and is also used to turn of all the Check engine lights from my mods. the only thing i cant do is tell it I am spraying additional fuel, i have to depend on AFR self correction to compensate for the extra fuel.
RE: Higher boost and E85 or Methanol
Geeze, I AM getting old!
Maybe this should be in "Engineering History"?
http://www.radford.edu/~wkovarik/ethylwar/
Some interesting reading here.
There are some who would say the "Battle of Britain" (that was in WW II )was actually won by the Ethyl Corporation; climb performance by the defending British aircraft being much improved by the exotic 115/145 octane "super Gasoline".
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
However, by adding even a smallish amt of 'lead' (leaded racing fuel)you can arrive at octane numbers greater than simple average. Considerably more in some cases.
Worried about contact with the lead in 'leaded fuels'? I'm too old to even consider that but perhaps you are not. I'll admit it is a genuine concern these days, but I'm kinda old and have washed thousands of parts in leaded fuels since the 1940's(besides casting thousands of rounds of lead bullets) and, at least so far, I don't seem to suffer any permanent health problems.
Sorry, I don't get your reluctance to buy the correct octane fuel at eight bucks a gallon when you have invested tens of thousands of dollars in the project. Go buy a used Prius and use the money you save on fuel to buy race gas.
Rod
RE: Higher boost and E85 or Methanol
Once i find the most efficient and cost efficient way to achieve what i want i will do it, and if the answer is running pure 106 sonoco i dont care lol i just need to find my options.
So lol dont blow a lid over my questions, i just also noted the aircraft fuel is cheaper then the sonoco gas and also only a bit mroe then methanol its right in the range im already paying ... but ill just be using more it of it more often oh well ? i can switch tunes for real racing.
RE: Higher boost and E85 or Methanol
Lead from the fuel will coat things inside the chamber, piston tops and ports and will wash through for some time afterward, hence my warning about passing emissions.
If it where not for catalytic converters being poisoned by lead I think we would still be using it. I know it's toxic, but so are the substitutes.
Mixing leaded and unleaded fuel is a guessing game as different components that may be used in fuel have different reactions to the addition of lead. You will never know the exact composition of any fuel you buy, or if it changed from last time. The specs for fuel are performance based not formulation based.
as you have no catalytic converter and by the sound of it are unlikely to ever retrofit just buy the 110 octane or do risky experiments at your own peril.
I like Rod and maybe yourself are stark raving mad when it comes to the pursuit of power, even in a DD.
Regards
Pat
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RE: Higher boost and E85 or Methanol
It should read 130/145 octane.
AND IT'S PURPLE! Probably run 100 "hg MAP with this stuff.
Thruthefence regrets the error.
RE: Higher boost and E85 or Methanol
Regards
Pat
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RE: Higher boost and E85 or Methanol
"Mixing leaded and unleaded fuel is a guessing game as different components that may be used in fuel have different reactions to the addition of lead. You will never know the exact composition of any fuel you buy, or if it changed from last time. The specs for fuel are performance based not formulation based."
are you trying to say the blend will variate too much and its not worth trying and wont be effective ? or if you do try to mix there is a process to test to see if its good or needs more of one thing or the other.
RE: Higher boost and E85 or Methanol
From what I saw, I am convinced that if you are not a chemical engineer employed in the race fuel industry, just stick to buying the 'off the shelf' race gas. I did some combination of unleaded premium and leaded regular when I could no longer get proper high octane fuel for my street rods late 70's early 80's. I followed what I had read in the auto mags and, yes, it really did seem to work. A little leaded mixed in with a tank of premium made for an octane sufficient to keep the little beastie from pinking and knocking under heavy acceleration. Keep in mind that was for STREET and in no way would I subject one of my $50,000 race engines to such fuel. Any engine I build for common usage today must be able to run on 89 octane regular and our race engines are fed 110 VP.
Here is a little thought that perhaps most folks don't take into consideration when it comes to cost in racing.....For a weekend at Laguna Seca as example...
Tow vehicle fuel---$640
Race fuel two day race---$110 to $160
Tires---$400 to $800
Lubricants (Red Line Racing)---~$110
Wear and tear, especially on the old man---Priceless.
Entry fees, food for crew, etc.---All for just an amateur, vintage race weekend. Double all this if we take both cars. Trust me, this IS bucks down racing...The 'big boys' would laugh at such numbers.
Hey, it's up to you. Make some short video, post to YouTube and, give us the link---especially if you get 500rwhp!!!!! I may be losing interest in this thread but NEVER in the subject matter. Get on with it and then tell us what YOU have observed.
Rod
RE: Higher boost and E85 or Methanol
I will go dyno next weekend after another week of tuning, I am talking with a professional who makes the tuning device via email and he is drastically improving my tuning for me and has helped more than anyone. he himself happens to own the same car so it helps alot enthus wise.
With similar mods and boost levels people with my car are making around 400 so i should expect at least that much.
RE: Higher boost and E85 or Methanol
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
Mixing fuels is a guessing game. Probably 99 times out of 100 you can guess right, and people publish magazine articles on ONE test.
1 in 100 you guess wrong and blow an engine. Is it worth it.
Regards
Pat
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RE: Higher boost and E85 or Methanol
You might have better luck with 'blue stripe' marine exhaust hose. The variant without the wire spiral will even flex a little.
If that doesn't work out, you can progress to blue silicone marine exhaust hose, but be careful to check the limiting pressure; it comes in several wall thicknesses.
Mike Halloran
Pembroke Pines, FL, USA
RE: Higher boost and E85 or Methanol
Regards
Pat
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RE: Higher boost and E85 or Methanol
There is another online shop based in Colorado that has good prices. I forget the name, but if you search on turboford.org it should come up. My recommendations are based on shipping to the US. If overseas, you should able to find a good source closer to your location.
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
http://www.summitracing.com
http://www.jegs.com
http://www.importperformanceparts.net
http://www.nolimitmotorsport.com
Regards
Pat
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RE: Higher boost and E85 or Methanol
http://www
RE: Higher boost and E85 or Methanol
I haven't had the time to read many of the posts but one thing I have picked up, and its a bit of an aside, is that you are running a wall guided DI set-up and increasing fuel delivery.
You need to be careful with this as it can put you at risk of significant bore wash, which will cause some very expensive damage. Not only that but badly set up GDI engines (in terms or inj pressure & timing) can fill the sump with fuel in a very short time, degrading the oil and causing damage throughout the engine.
MS
RE: Higher boost and E85 or Methanol
In Kettering's biography "Professional amateur" I think he mentions that the introduction of tetraethyl lead (1920s?) was anticipated as increasing engine wear by some mechanism or another. Interesting how theory is sometimes overcome by fact.
I'm eagerly waiting for medical "science" to discover that hot salty fat is actually good for me but only when taken with mega-doses of cheap domestic beer.
RE: Higher boost and E85 or Methanol
"Troubles continued to test Kettering and Midgley's commitment to tetraethyl lead in the 1922 to 1923 period. The compound was extremely hard to make and it broke down quickly in the sunlight. Engine tests showed that particles of lead burned holes in the exhaust system and valve seats. Lead oxide also caked onto spark plugs, stopping the engine after a few thousand miles. "
RE: Higher boost and E85 or Methanol
Regards
Pat
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RE: Higher boost and E85 or Methanol
http://tinyurl.com/4344v5r
RE: Higher boost and E85 or Methanol
All to PC for me. I've washed so many parts in leaded fuel and handled so much lead that, if you can believe all the hype, I should have died long years ago. However---I'm still here and still using leaded racing fuel.
If your using an Okie credit card, the "new gas" tastes better than the old leaded stuff....;o)
Rod
RE: Higher boost and E85 or Methanol
Furthermore, DISI engines operate with quite different needs wrt knock-limited and MBT AFR. They operate best with mixtures rather closer to stoichiometric than old PFI/carbureted engines. Even the Audi R8 turbocharged FSI LeMans racing engines before the Diesel era were running closer to lambda 0.85-0.93 at full-load on gasoline.
Blending some methanol in the fuel tank will raise the octane number of the blend, and also the very high latent heat of vaporization of methanol will help charge cooling. Direct injection magnifies the charge cooling effect. Just make sure that the fuel system components are compatible with MeOH. If this is OK, I would suggest running the tank to near empty and splash blend a small amount to about ~M50 start to start. Calculate your fuel use carefully and observe knocking tendency and progressively add more *pure gasoline* until you are at the threshold of knocking; determine the percent MeOH at that point and that's about where you should be running. Lambda should be brought back up to the aforementioned ~0.85 as a starting point, however. When you run higher MeOH percentages, you will need a higher injector flow rates to maintain a given lambda at the same pulse width duty cycles, so keep this in mind).
One other thing you can do is if your engine has mapped computer-controlled cam phasing, you can try to retard the intake camshaft. This will have the effect of reducing the effective compression ratio and operating on a pseudo-Miller cycle. If you have a limited adjustment range, you could try to retard the timing by physically moving the camshaft by one tooth in the retard direction (re-indexing the cam position sensor accordingly) and also adjusting the phasing map so that you don't have such late IVC when you don't want it (e.g. at low load, low RPM).
There's no reason why a DISI, 4-valve pentroof head cannot retain a 9.3 geometric CR with the amount of boost you are running. It's a simple calibration issue.
RE: Higher boost and E85 or Methanol
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
At higher revs when the engine starts coming "on the cam", detonation is less of a problem anyways.
Engines in those applications are designed to make power with revs, not stump-pulling torque off idle. In a drag-racing car, you use a torque converter with a really high stall speed ... having torque off idle doesn't matter much. In a roadracing sport-bike, the rider keeps the revs high, in the powerband. In a heavy(ish) car with a manual transmission, absence of low-end torque (relative to top end power) could get rather annoying.
I agree with the other comments that your thick head gasket solution is the wrong thing to be doing; you need whatever squish you can get.
RE: Higher boost and E85 or Methanol
Forced-induction race engines by virtue of radical cam timing run a de facto Miller cycle (minus the late EVO that makes it a true Miller).
RE: Higher boost and E85 or Methanol
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
At higher revs when the engine starts coming "on the cam", detonation is less of a problem anyways.
Not forced-induction and only partially germane to the discussion, but Mazda's SKYACTIV-G is basically a Miller-Atkinson cycle with late IVC, allowing the engine with 14:1 compression to survive with pump gasoline. I suspect heavy full-load enrichment, especially near the max. power point but that's not an operating point in certification drive cycles.
h
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
RE: Higher boost and E85 or Methanol
But, I just wanted to say (Since I own a mk6 GTI)
Too bad APR is only for VAG cars. For a few grand you can get 450 whp from a 2.0 TSi/FSI engine installed and with proven reliability.
Fe
RE: Higher boost and E85 or Methanol
Fex32, I agree with your first sentence. The remainder of your post is cryptic, superficial and unhelpful, since you have thrown in 4 TLA'a (three letter acronyms) that are not commonly known (correct me if I'm wrong), and I don't see how it relates to the OP.
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
I never meant to offend anyone here, particularly the other respected members like yourself. And I expect the same respect in return. I have my own engineering expertise to which I am surely extremely knowledgeable about (I won't go right out and say what I mean here...). I already acknowledged your good knowledge on this subject and still stand by it, as I have respect for it.
My post was not meant for you.
The OP is surely familiar with the acronyms as he is obviously a sport tuner (not an engineer) and knows the long rivalry between MS3s and GTIs.
I happen to be a GTI owner and know many MS3 owners. I thought I might put a bit a advocacy in this thread..... although not helpful technically it is relavent....(if not to at least make the OP chuckle
If you are wondering why I am reading this it is to learn for myself outside of my regime.
Feel free to think otherwise.
With all due respect intended,
FeX32
Fe
RE: Higher boost and E85 or Methanol
I apologize if you are an engineer Nitr0EngiEx.
To add to the above post, I think my reputation thus far on this forum has proven some of my spare time is full of witty engineering
During the day I am a research engineer at a robotics institute.
Fe
RE: Higher boost and E85 or Methanol
I forgot what I was going to say
RE: Higher boost and E85 or Methanol
Much appreciated.
APR refers directly to http://www.goapr.com/ , which is a very well respected tuning company for Volkswagen, Audi, and Porsche.
VAG usually refers to the group of automotive companies which encompass VW. http://en.wikipedia.org/wiki/Volkswagen_Group
This now includes many manufactures other then just VW.
TSI/FSI, is the type of engine produced for 6th generation (Mk6) GTI's. I believe it refers to Turbocharged Stratified Injection. (See attachement) . I believe VW won several awards with its development as it combines power and fuel economy.
If the OP was driving a GTI instead of a MS3 (Mazdaspeed 3), he could shell out 3-4 grand for a kit by APR for at least 380whp. I realize that the OP might be offended by this, or he might like to "do it yourself".
Sorry for the VAG advert here. hehe
Thanks for the invite to stick around this thread. Will do.
Fe
RE: Higher boost and E85 or Methanol
Worrying about what the OP may or may not think is apparently a simple waste of time as he posted this question on 15,May and last cked back on 30,May. Seems like the OP is out of the loop.
Rod