exhaust flow questions
exhaust flow questions
(OP)
Hello all,
I'm building a project car for track / street use. It's an all motor aplication that has a high flow cat. I'm 41 so having a car thats loud doesn't appeal to me very much. BUT, at the same time I want performance. My ecu is tuned with Hondata so changing the exhaust when I go the roadcourse isn't an option. I need to find an exhuast that will give me the best of both worlds.
I have been playing with the idea of putting a factory.....restrictive muffler on it and then adding yet another one to relieve back pressure from the factory exhaust and reduce the amount of exhaust note of having one none restrictive exhaust. Is it worth the added cost to add another muffler to it and will it yeild the result I want?
Thanks in advance,
Barney Demonbreun
AshlandMotorsports.com
I'm building a project car for track / street use. It's an all motor aplication that has a high flow cat. I'm 41 so having a car thats loud doesn't appeal to me very much. BUT, at the same time I want performance. My ecu is tuned with Hondata so changing the exhaust when I go the roadcourse isn't an option. I need to find an exhuast that will give me the best of both worlds.
I have been playing with the idea of putting a factory.....restrictive muffler on it and then adding yet another one to relieve back pressure from the factory exhaust and reduce the amount of exhaust note of having one none restrictive exhaust. Is it worth the added cost to add another muffler to it and will it yeild the result I want?
Thanks in advance,
Barney Demonbreun
AshlandMotorsports.com





RE: exhaust flow questions
ISZ
RE: exhaust flow questions
RE: exhaust flow questions
For a street/track car, the options are endless. A nice high flow cat and something like a Flowmaster Hushpower II could be a winner. Won't hurt hp too much and a moderate loss in midrange tq for most engines up to ~300hp for a single exhaust. You could use a Supertrap (the disc thingy that ISZ refers to)but it's a real PITA for most street applications. It IS, however, easily "tunable" by adding discs for track and removing them for street which makes them a good choice.
I've used both for track applications over the years (SCCA mandates sound limits) in racing, but with the exception of Laguna Seca, no tracks in Socal require noise attenuation in vintage race cars.---Lucky me!
Rod
RE: exhaust flow questions
RE: exhaust flow questions
Soooo. Would I be really off base to assume that modern ECU could accept a wide range of mods (within reason)?
That's one reason I love my "vintage racing" Mini Cooper--- MSD/plug wires (no COP's)/Weber carb/open exhaust/etc. "No worries, mate"!
Rod
RE: exhaust flow questions
I carry my kids around in this car and the exhaust is loud enough that we can't hardly carry on a conversation. Not to mention.....on getting old enough to not want my car so loud just cruising around town.
RE: exhaust flow questions
Be that as it may...When you try to combine street and track capabilities in ONE automobile...You most often get the best street characteristics (unwanted?) in your track setup...and...the very worst characteristics of the track version in your street car.
Perhaps I'm a little older, but I would not take a race car to the store....so you should think hard on the concept of using your "grocery getter" on the track.
Rod
RE: exhaust flow questions
RE: exhaust flow questions
Just food for thought. Most forum members have already seen this so it's probably going to bore them to death...sorry for that. None the less, what happened to my pretty little black '63 Mini could happen to you. I knew better and that makes it even worse!!!
http://www.youtube.com/watch?v=tGIQ85maG2w
Rod
RE: exhaust flow questions
RE: exhaust flow questions
The good news is that the back pressure would probably be reduced, theoretically to as little as 1/4 of the original back pressure.
So, you are on the right track, but the practical complexities are enormous.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: exhaust flow questions
RE: exhaust flow questions
www.waldronexhaust.com
Rod