Re: Exhaust sizes (HELP)

[andrew smith]

Daniel, I reckon 2 1/2" is probably ok up to 250hp and anything over that i would probably go for 3".Ive done quite a few 2 1/2" and 3" exhaust for turbo cars.Mainly 1600's,silvias,skylines and vl's.A vl with a 60 trim t3 i did went from 226rwhp to 256 rwhp going to a 3" from 2 1/2".I havent done any other before and after dyno runs but they all felt better with a 3".The 2 1/2" ones ive done felt heaps better than the standard stuff.A mate just did a 3" exhaust on a twin turbo 2.5 supra and you should have felt the difference.The standard exhaust was the worst ive ever seen.It was actually less the an 1 1/2" in places.Ive allways fitted 3" to turbo 1600's as most guys say they'll be happy when they run 12's which needs over 300hp to achieve. Andrew Smith Daniel Kroehn wrote: List, heres a question for all you switched on turbo boys.  Following traditional lines for an exhaust, I was going to get a 3 inch system for my turbo project.  However after reading "maximum boost" by corky bell, it seems that he reckons that for the approximate engine power output of my engine, I should use a 2.5 inch system.  The book also states that for a turbo setup the least exhaust is the best?  I'm very confused by now.  Anyway back to the 2.5 inch set-up, this size comes from a few calculations to do with exhaust gas  velocities.  He recommends that the exhaust gases shouldn't exceed ~450 feet per second, and thus a 3 inch system would be capable of much more than that, so no good?There's a bit more in the book but at this stage I've just become totally confused. Eagerly awaiting some opinions.................. Daniel Kroehn  --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/membersozdat@datascribe.com.au/ ---------------------------------------------------------------------