Printable Version | Subscribe | Add to Favourites
New Topic New Reply
Author: Subject: Turbo exhausts, much gain to be made?
StrikerChris

posted on 12/12/15 at 02:40 PM Reply With Quote
Turbo exhausts, much gain to be made?

Trying to fill time in work, for me and apprentices.Thought making a new exhaust would kill some time, at the mo I have one with a cat, 3" going in, 2.5" exit. I forget where it came from.Now I don't have to worry about emissions and its an easy project for the apes, thought I'd get them to stick a 3" straight through pipe together. Question is do exhausts make much difference on turbo motors, , especially over such a short length? That fan the gasses hit must cock things right up from the start!

Chris

View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
mark chandler

posted on 12/12/15 at 05:11 PM Reply With Quote
On my little car I run a 3" pipe all the way even though the turbo has a 2" exit, this runs at 102db, if I need to run below this I have 12" of 2" perforated tube with wadding that goes up the tail pipe so effectively adding a 2" restriction at the end.

When this is in place it is noticeable that it is down on power, the top end is slightly stifled.

Regards Mark

[Edited on 12/12/15 by mark chandler]

View User's Profile View All Posts By User U2U Member
MikeRJ

posted on 12/12/15 at 08:41 PM Reply With Quote
Any back pressure on a turbo exhaust system can degrade performance (e.g. spool time, maximum boost), so it's important for it to be as free flowing as possible. Gas velocity isn't an issue downstream of the turbo, which is why you see huge 3+" systems used on high power GTRs etc.
View User's Profile View All Posts By User U2U Member
coyoteboy

posted on 12/12/15 at 10:33 PM Reply With Quote
Yeah larger is, within reason, always better with tubby engines.

Best gains tend to depend on the engine in question, but try to concentrate on keeping diameters matched and blending the wastegate flow in smoothly further away from the turbine rush oem would.

[Edited on 12/12/15 by coyoteboy]






View User's Profile E-Mail User View All Posts By User U2U Member

New Topic New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.