Does the pipe size really matter?
Joined: Jun 2005
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From: Fake Virginia
heh i just asked this in another thread.
some thoughts (no science to them):
changes in flow area are a restriction. you want smooth transitions (not steps)
the flow after the IC is probably very turbulent so larger tubing might help flow.
stock throttle body is 2.5... for flow? people run larger throttle bodies for some reason.
the IC is the limiting factor anyway.
hmm.
some thoughts (no science to them):
changes in flow area are a restriction. you want smooth transitions (not steps)
the flow after the IC is probably very turbulent so larger tubing might help flow.
stock throttle body is 2.5... for flow? people run larger throttle bodies for some reason.
the IC is the limiting factor anyway.
hmm.
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I think if you'll do a search over at m.net, or through Corky's posts there, you'll find that he's researched this at length.
If I remember correctly, he did back to back runs on pipe size ranging from about 1.75-3.00 inches and found virtually no difference in spool/power/response/etc... In the power and psi ranges we typically deal with on this forum, anywhere from 2.0-3.0 will be identical.
The benefit of smaller pipes is (as said earlier) that they are much easier to route... and they're cheaper (both for pipe and couplers). However, almost all of the eBay intercoolers out there are 2.5" in/out and the intake manifold inlet for 1.6 and 1.8 motors is also 2.5".
Depending on your turbo, the compressor outlet can be anywhere from 1.75 to 2.5". Most of the smaller T25's I've seen have been 2", which means a 2"-2.5" enlarger coupler and then 2.5" all the way to the manifold. Somebody with a T3, what do your compressor outlets run?
I run 2" all the way to the manifold, and use a 90* 2"-2.5" enlarging coupler there.
If I remember correctly, he did back to back runs on pipe size ranging from about 1.75-3.00 inches and found virtually no difference in spool/power/response/etc... In the power and psi ranges we typically deal with on this forum, anywhere from 2.0-3.0 will be identical.
The benefit of smaller pipes is (as said earlier) that they are much easier to route... and they're cheaper (both for pipe and couplers). However, almost all of the eBay intercoolers out there are 2.5" in/out and the intake manifold inlet for 1.6 and 1.8 motors is also 2.5".
Depending on your turbo, the compressor outlet can be anywhere from 1.75 to 2.5". Most of the smaller T25's I've seen have been 2", which means a 2"-2.5" enlarger coupler and then 2.5" all the way to the manifold. Somebody with a T3, what do your compressor outlets run?
I run 2" all the way to the manifold, and use a 90* 2"-2.5" enlarging coupler there.
I did some searching and found similar stuff...I'll just try to copy your I/C setup
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Joined: Jun 2005
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From: Fake Virginia
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Senior Member
Joined: Mar 2005
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thanks
Ive stopped searching at m.net about things like this that might be a grey area because of the smug cloud around that forum
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Junior Member
Joined: Oct 2006
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FWIW, the rear-mount camaro guys run huge pipes up and down the entire length of the car and they have zero problems with lag or making power. The turbo and the engine both flow such an enormous amount of air that the volume of the pipes are completely immaterial.
I think you will get bigger gains just from avoiding lots of unnecessary turns and unnecessary pipe diameter changes. That is more of a flow-related argument than a volume related argument. My thinking is that if the outlet on my T04E compressor is 2", how much gain am I going to get from running bigger pipes?
I think you will get bigger gains just from avoiding lots of unnecessary turns and unnecessary pipe diameter changes. That is more of a flow-related argument than a volume related argument. My thinking is that if the outlet on my T04E compressor is 2", how much gain am I going to get from running bigger pipes?
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