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Paul Webster · Sep 20th, 2007, 08:14 PM

Quote: Originally Posted by Snowie (original)

Has any one any idea on what is the ideal exhaust back pressure.

Mine is currently circa 3.4 PSI Is this too high and interfeering with BHP gains

Set up is GP with JCM 4.2.1 Sports cat and standard GP twin rear silencers complete with the 'flat' bit before the 'y' piece.

We've been eperimting with cat backs and it seems that what you think should work doesn't and what shouldn't work does.

The difference in trq on some is unreal. We were discussing today about having a catback shootout one day next week

Sep 20th, 2007, 08:14 PM	#11
Paul Webster MINI2 Master Join Date: Jul 2005 Location: Beds Cambs Northants Local Time: 01:42 PM Posts: 1,938 Offline	Quote: Originally Posted by Snowie (original) Has any one any idea on what is the ideal exhaust back pressure. Mine is currently circa 3.4 PSI Is this too high and interfeering with BHP gains Set up is GP with JCM 4.2.1 Sports cat and standard GP twin rear silencers complete with the 'flat' bit before the 'y' piece. We've been eperimting with cat backs and it seems that what you think should work doesn't and what shouldn't work does. The difference in trq on some is unreal. We were discussing today about having a catback shootout one day next week Slicks 11.77@115.92mph Street tyres 12.162 @ 119.02 It's not how much you spend but how well you spend it