My exhaust system for SR20det is I think 2 & 3/4" down to 2.5" to a 2.25" tailpipe, seems to flow nice and passed the noise test at 86db
----- Original Message ----- From: "Cleary Signs" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, April 28, 2004 1:12 PM Subject: Re: exhausts questions > what induction will you be running on the L20, i wouldn't call a L20 a high > reving motor, i would go the 4-2-1 on a L series, esp a L20, if running N20, > what size gas kit will you be running? as this will determine what size pipe > you need. > As the exhaust gases cool they condense, so i would be 2 1/2 to half way > then, go down to 2 1/4 through the diff. > on a 4-2-1 system, 4 x 1 3/4 primaries 12" long, into 2 x 2" into a 2 1/2 > collector at 18" long. i think this is what Murray Coote told me. this is > for a 200hp+ L series. Ring Dave Feron in Redcliffe, i'm pretty sure he'll > still have the specs. > > Heath > > ----- Original Message ----- > From: "Jake Andrew" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Wednesday, April 28, 2004 9:10 AM > Subject: Re: exhausts questions > > > > I have just done a fair bit of research into exhaust systems as I am > having a full custom system done for my 1600 at the moment. Everyone I have > spoken too seems to think that anything over 2 1/4 inch on a NA 2 litre is > simply overkill and will only produce more noise. For a high revving 2 litre > a good 2 1/4 inch system should produce great results. An example given to > me was the S2000 which runs 2 1/4 inch pipes till it splits to the twin rear > mufflers. These engines are making around 170kw which is more than most L > series will make in NA form. > > I am getting a set of 4-1 extractors made with 1 5/8 primaries going to a > full mandrel bent 2 1/2 inch exhaust with a resonator and triple pass hi > flow rear muffler. This should have very good flow whilst not being overly > loud. This system is for an L20 that will be running a fair bit of nitrous > and will most likely end up supercharged. To run a 2 1/2 inch exhaust you > will have to cut the rear crossmember as the factory crossmember exhaust > hole is 2 1/2 inch. > > I run a 3inch system on my FJ20et 1600 with only a truck resonator at the > rear. It flows extremely well, you can drop a tennis ball in the top and it > rolls straight through, but is up around 105db. > > Jake > > > > > > --- Brad <[EMAIL PROTECTED]> wrote: > > > > >From my experience any bigger than 3" is a waste of time, perhaps this > might more apply to NA cars than turbo, but I think definitely guys go for > the milo tins and cost themselves power. > > > > I think the rice-tosspots put on shit for the sake of it when they could > choose their bits more carefully and appropriately and end up with more > power and less noise. > > > > I know I'd always prefer a sleeper. > > > > A very common mistake lots of people make too is fitting race-style > extractors to a road car so the thing is tuned for 5000rpm and is shit at > low revs. > > > > We built a custom exhaust for the HQ which had nice big collectors going > to a smaller diameter pipe (I think 3" down to 2.5") with a hotdog and > megaphone. OK not a good indication of a road system, but our car (which > was down on outright power due to no head work etc), had great drive out of > the corners so you could nip up the inside of people on the short tracks. > > > > The exhaust was shorter overall as well (came out under the drivers door > as apart from in front of the rear wheel), and the guys with longer exhausts > seemed to have better top-end (but they were probably on the dyno more). > > > > > There is some debate about exhausts being too big & not providing enough > > > back pressure. > > > But i think its only the first part of your exhaust (the headers) that > > > affect this. > > > that why some new exhaust systems run variable exhaust manifolds as it > > > affects your torque at various revs. > > > > > > go to about halfway down on this web page for some info. > > > > > > http://www.autospeed.com/cms/A_46/article.html > > > > > > > > > I am running 4-2-1 motivator extractors into 2 1/2 with 3" tail pipe & > turbo > > > muffler. > > > the 4-2-1 (or "y" extractors) give a slightly more spread torque range > than > > > 4-1 > > > I think 2 1/2 inches is biggest that will fit in the rear cross member > of a > > > 510 > > > without enlarging the hole :) > > > > > > When i got rid of the bit of curtain rod that was on my car i noticed > not > > > more power > > > but that the engine felt like it could rev out further easier. > > > > > > BUT i could have it all wrong so ask some professionals :-) > > > cheers Jeff > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] Behalf Of kla > > > Sent: Sunday, April 25, 2004 12:47 AM > > > To: [EMAIL PROTECTED] > > > Subject: exhausts questions > > > > > > > > > I've been wondering about sports exhausts, as i was thinking of > getting a > > > system installed (extractors to the back) > > > and i was wandering. as a general rule. sizes. obviously too small > means > > > not enough flow, but what about big? > > > what happens when you get too big, and what is generally the best size > for > > > a 1.5litre (standard, non-turbo etc.) > > > if its too big do you get a dead space effect where it cant move > enough of > > > the air or what? > > > cheers. > > > > > --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/[EMAIL PROTECTED]/ > > --------------------------------------------------------------------- > > > > > > > > > > > > > > > _____________________________________________________________ > > AutoSpeed - The World's Best High Performance Online Magazine > > http://www.autospeed.com > > > > > > > > > --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/[EMAIL PROTECTED]/ ---------------------------------------------------------------------
