Does the pipe size really matter?
#1
Does the pipe size really matter?
Currently I'm not running an IC, but I'm piecing this together still. I've got an intercooler that I'm going to use and it has 2" inlets/outlets. Anyone know the outlet size on the GT2560 turbo from the FM kit? I can't remember offhand.
Anyways, does the pipe size really matter? Say I run 2" from the turbo to the IC, should I keep 2" up to the TB and just use a transition or bump up to 2.5" (think thats the TB size) after the IC all the way to the TB. Does it really make a difference at all?
Anyways, does the pipe size really matter? Say I run 2" from the turbo to the IC, should I keep 2" up to the TB and just use a transition or bump up to 2.5" (think thats the TB size) after the IC all the way to the TB. Does it really make a difference at all?
#6
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It would be interesting to see a comparison between 2" and 2.5" charge pipes. I would suspect that the larger volume of air held in 2.5" pipes would offset any gains in velocity. Actually, I think velocity isn't that important in a boosted application.
#14
Mine's 2.5 all around. The only adapter is from the commpressor to the first intercooler pipe. My intercooler has 2.5" inlet/outlet, so I bought a 2.5" universal pipe kit on ebay.
Note: 2.5" leaves little room to work within the space provided for the pipes, and t-bolt clamps included in ebay pipe kits SUCK. I broke 5 after driving on the salty roads.
Note: 2.5" leaves little room to work within the space provided for the pipes, and t-bolt clamps included in ebay pipe kits SUCK. I broke 5 after driving on the salty roads.
Last edited by SamS; 01-28-2007 at 12:28 AM.
#17
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.