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  1. Viper488

    Post turbo exhaust tuning important?

    You can still optimize HP, at least on a n/a car, by chooing the correct exhaust plumbing at all points to the exhaust system exit. Sounds like tuning. Anyway- Why isn't it an issue on street cars? Maybe you mean OE cars with turbos, and the typical manufacturer not particularly concerned...
  2. Viper488

    Post turbo exhaust tuning important?

    Well I'm confused then. Hemi says "tuning really isn't an important consideration post turbo. The cylinder pulses are heavily dampened due to the expansion in the turbine. The overriding criterion is minimization of backpressure." Then, subsequent replies here go on to talk about raising...
  3. Viper488

    proper exhaust dimeter

    I'd suggest measuring your exhaust backpressure. David Vizard suggests about .2psi for a no hp loss exhaust system. Pay as much attention to the muffler you stick on the end of it. You don't want a muffler with perforated core that's restricting exhaust flow. See if you can find info on the...
  4. Viper488

    Tire diameter as part of overall gear ratio

    Well, related topics aside, I'm just wondering if there's a difference between a stiff gear turning a tall tire and a not-so stiff gear turning a shorter tire. When both set ups more or less equal out mathematically when plugged into a mph formula. Or any variations of that formula. A...
  5. Viper488

    Tire diameter as part of overall gear ratio

    I know that tire diameter is part of various formulas like: MPH = RPM x Tire Diameter ------------------ gear ratio x 336 But just in case.. I wanted to ask if all other things being equal, does a ring & pinion ratio of say 3.45 with a talle(r) tire perform better in drag racing than a r&p...
  6. Viper488

    Insulation of Car Exhaust

    One of the car mags, Hot Rod or Car Craft, just did a test on all the heat coatings available for various parts of the engine. Coating the headers did lower external measured exhaust manifold temps by 200deg, but did not increase dyno HP at all, as I recall.
  7. Viper488

    Post turbo exhaust tuning important?

    I would think so. Yet there just doesn't seem to be much general info or tech articles on the internet about post turbo exhaust tuning etc..
  8. Viper488

    Tuning motorcycle carburettors

    On a side note, I glued some plastic dowel rod to the underside of my 1150 Suzuki's CV carb tops to fill up most of the cavity above and in the slides. I theorized that engine vacuum has to empty out the slide cavity each time you wick the throttle.. The dowel rod was small enough to fit...
  9. Viper488

    Air Inlet Sizing Question (Fluids Theory)

    Speaking of today's high gas price world, would you believe a V10 Viper turbocharged to over 1000hp can get almost 30mpg on the highway with its' OE 3.07 axle ratio and a .5 overdrive 6th gear? 10 litre/450hp Vipers typically get highway mpg numbers well into the 20's when burbling along in...
  10. Viper488

    Exhaust collector venturi function/advantage ??

    How important is the rotational order of primaries entering a collector? Meaning having primaries arranged in the collector in order of their firing order to yield maximum benefit from an adjacent primary's ability to assist it's neighbor. As opposed to having the across the collector from...
  11. Viper488

    Post turbo exhaust tuning important?

    I've been searching the internet and can't any info on choosing pipe diameter, flow requirement calculations etc for a turbocharged car. Plenty of theory for n/a cars of course. People in the car forums I hang out in say it 'doesn't matter'. Could be I suppose. With the turbo blocking so much...
  12. Viper488

    Optimum muffler position is..?

    I've recently found and read the Vizard article. Many websites have printed it. If the muffler was further back that'd leave more room for the gases to expand before reaching the restriction of a typical muffler. Vizard says tune the engine for best H/ collector length, then add the...
  13. Viper488

    Cleaning prisms in production application

    So sonic cleaning is out then? There's a number of crevices in the small assembly but most of the cleaning is on the many faces of the prism. There is also some sort of orange-ish acid used for stubborn stains. They're not horribly dirty, just the odd fingerprint or bit of foggy film to be...
  14. Viper488

    Cleaning prisms in production application

    A relative of mine is involved with a company that has its' production employees use kleenex, toothpicks, and acetone to clean their prisms during the product assembly process. This seems terribly lo-tech, and is a major hold up in the overall production count per shift. The prisms are used in...
  15. Viper488

    AMODEL type A/B plastic for intake manifold?

    I'd like to re-do an after market blower intake manifold in some sort of plastic media that's comparable to AMODEL. Something that does not have to be injection molded. Available in Part A&B canned form, or that can at least be purchased in block form to allow me to have it machined to my...
  16. Viper488

    Low cost plastic molding?

    Are there new age molding techniques that a private party can use to get have something molded in low volume without having to use the expensive steel molds? I want to as cheaply as possible what is essentially a box that's flared a bit at the top using some sort of heat resistant plastic or...
  17. Viper488

    More blower psi vs same + ported heads

    Anything over a 5psi pulley on this engine is strongly discouraged by those who know due to the pistons. A higher cylinder inlet charge temperature mostly because the air's heated up more by the increased blower speed, or by increased compression in the intake after the blower? As designed...
  18. Viper488

    More blower psi vs same + ported heads

    I feel like this keeps straying off course... The facts are that on this engine with this particular blower, the blower with the 5psi pulley and ported heads, makes more rwhp than without ported heads-lots more. The blower with the 7psi pulley with unported heads make more power than the 5psi...
  19. Viper488

    More blower psi vs same + ported heads

    Well...on these particular blowers, whatever negative side efffects there are, more blower speed does yield more horsepower. You seem to be saying because of the qualifiers it all balances out to zero gain...(?) That aside, I'm still wondering what the difference is in the end for this...
  20. Viper488

    More blower psi vs same + ported heads

    Okay, here's an engine with hypereutectic AL pistons traditionally said to be limited to 5psi from a DIY blower kit using a Whipple blower. Setting that aside for the moment, but keeping that limitation in mind, what's the difference between adding ported heads to that 5 psi s/c engine, or...

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