[HTi]Johnson Posted March 18, 2005 Share Posted March 18, 2005 How big is the I.D. (Inside Diameter) of a stock crossover pipe? and what would be the perfect size for a happy medium...you know...not too laggy and pretty good topend? [HTi]Johnson Link to comment Share on other sites More sharing options...
rallyruss Posted March 18, 2005 Share Posted March 18, 2005 the narrowest point is aprox 1 1/4" right at the bend to go up to the turbo. I choped that section out and put in a 2" section. posted it back when I did it. also smoothed the ports in and out of the up pipe. runs good but then again I did the TD04 at the same time so who knows what it really did. Link to comment Share on other sites More sharing options...
[HTi]Johnson Posted March 18, 2005 Author Share Posted March 18, 2005 OOOH!! Pretty turbo. I was thinking of TRYING to make an equal length crossover pipe...out of 1.5" tube of .095 wall...so that makes it likea little smaller than 1.375"(1 and 3/8th inch) [HTi]Johnson EDIT: Oh yeah, the reason I can't make it bigger is because of my resources...everything I have access to is for some heavy duty tube. (I work for an Ornamental Iron company:-p) Link to comment Share on other sites More sharing options...
rallyruss Posted March 18, 2005 Share Posted March 18, 2005 OOOH!! Pretty turbo. I was thinking of TRYING to make an equal length crossover pipe...out of 1.5" tube of .095 wall...so that makes it likea little smaller than 1.375"(1 and 3/8th inch)[HTi]Johnson that would probably work well. leave the dump into the turbo a bit small to keep speed up. I was looking at the turbo off a 1.8T VW in my garage and it has a tiny inlet but can make some real good power. Link to comment Share on other sites More sharing options...
garner Posted March 18, 2005 Share Posted March 18, 2005 OOOH!! Pretty turbo. I was thinking of TRYING to make an equal length crossover pipe... Equal length will be a pita unless you have a very tight mandrel bender. I build mine out of stainless weld elbows and straight pipe (from coyote steel) check it out http://usmb.net/gallery/album290/P6160094 The pipe is 1.5 schedule 80 (i think) the id is 1 5/8 which is too big but it flows like a mo fo If I were to do it over, I'd go for about 1 1/4 or 1 3/8. reguardless of the id the design is far superior to that pos bathroom plumbing thing they car a header. garner Link to comment Share on other sites More sharing options...
TheSubaruJunkie Posted March 19, 2005 Share Posted March 19, 2005 This thread has made me realize just how badly I want a new header... and a new turbo... oh... and then I can install my IC -Brian Link to comment Share on other sites More sharing options...
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