wkdtime Posted August 21, 2006 Share Posted August 21, 2006 When running a T67 turbo to aim for 500+BHP is it a better option to go for a 4" DP appose to a 3" DP which most come with? Is the difference noticeable? Reason i ask is that the PHR stage 2+ (GT67) which is designed for 500BHP+ has only a 3" DP, wouldnt it operate better with a 4" DP similar to the BL stage 2? Quote Link to comment Share on other sites More sharing options...
Alex Posted August 21, 2006 Share Posted August 21, 2006 4" would be nice but not necessary. Quote Link to comment Share on other sites More sharing options...
Pig Posted August 21, 2006 Share Posted August 21, 2006 What would the benefits be from a 4" DP? Quote Link to comment Share on other sites More sharing options...
Alex Posted August 21, 2006 Share Posted August 21, 2006 In theory even less backpressure so faster spool up and better volumetric efficiency. Quote Link to comment Share on other sites More sharing options...
Pig Posted August 21, 2006 Share Posted August 21, 2006 Im thinking of buying a smaller exhaust. would there be any benefit in a 4" DP is i only have a 3" exhaust? Quote Link to comment Share on other sites More sharing options...
Alex Posted August 21, 2006 Share Posted August 21, 2006 not really no... Quote Link to comment Share on other sites More sharing options...
LeeT Posted August 21, 2006 Share Posted August 21, 2006 3" will be plenty big enough for most on here Quote Link to comment Share on other sites More sharing options...
wkdtime Posted August 21, 2006 Author Share Posted August 21, 2006 Just found out that PHR do a 4" and a 3.5" DP. Quote Link to comment Share on other sites More sharing options...
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