Piping Sizing Questions
04-18-2006, 01:03 PM
#1
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Piping Sizing Questions
I just have a couple questions on piping sizes. I currently have an almost boosted vq35 in my sentra. Im using 2.5"hot and 3" cold i/c piping and a 3" downpipe and 3" exhaust.
Now, I purchased a used reverse y pipe setup of a 4th gen max that we were modding to fit my car, but the feed piping is only 2.25". Do you think its worth re-making some new feed pipes in 3"? Or would the 2.25 be sufficeint.
Thanks in advance for the input,
Scott
Now, I purchased a used reverse y pipe setup of a 4th gen max that we were modding to fit my car, but the feed piping is only 2.25". Do you think its worth re-making some new feed pipes in 3"? Or would the 2.25 be sufficeint.
Thanks in advance for the input,
Scott
04-18-2006, 10:39 PM
#2
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Is just the two pipes comming off the headers 2.25" or is the whole thing 2.25"?
Reverse Y-pipes are usually made from aftermarket Y-pipe's which are usually 2.5" after the collector.
I use 2.5"-3"-2.5" feedpipe and it's fine. Mardi uses 2.5" feed pipe IIRC on his boosted 3.5. I guess if you don't mind reworking the piping 3" would not be a bad idea. But you want the exhaust velocity to be as high as possible going to the turbo.
Reverse Y-pipes are usually made from aftermarket Y-pipe's which are usually 2.5" after the collector.
I use 2.5"-3"-2.5" feedpipe and it's fine. Mardi uses 2.5" feed pipe IIRC on his boosted 3.5. I guess if you don't mind reworking the piping 3" would not be a bad idea. But you want the exhaust velocity to be as high as possible going to the turbo.
04-19-2006, 06:15 AM
#3
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The actually pipe after the y pipe that directly feeds the turbo is 2.25". Maybe its 2.5" but I had measured it a couple times. I think i may leave the pipe size as is and if boost responce is terrible I'll go to a 3" exhaust feed
04-19-2006, 09:13 AM
#4
3" feed is probably unnecessary. Two 2.25" off the manifolds to a 2.5" y pipe and up pipe is probably all that would be ever needed. The exhaust will bottleneck at any reasonably sized turbo anyway. 3" up pipe will probably not gain any noticable flow difference.
After the turbo is a different story. 3" all the way back is the way to go.
After the turbo is a different story. 3" all the way back is the way to go.
04-19-2006, 01:07 PM
#7
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those are the answers i like to hear!
but its not 2.25 from each manifold. its 1.xx" from the manifolds into a 2.25" feed...just for clarification.
I may aswell keep what I have for now. Thanks for the input
Oh ya, and I'll definetly post some pics after this weekend. I dont own a digital camera so one of my friends will be by on saturday to take a few pics. My cardomain site has a few pics aswell, but they are older and taken before the tranny and accessories were mounted .
http://www.cardomain.com/ride/762650
but its not 2.25 from each manifold. its 1.xx" from the manifolds into a 2.25" feed...just for clarification.
I may aswell keep what I have for now. Thanks for the input
Oh ya, and I'll definetly post some pics after this weekend. I dont own a digital camera so one of my friends will be by on saturday to take a few pics. My cardomain site has a few pics aswell, but they are older and taken before the tranny and accessories were mounted .
http://www.cardomain.com/ride/762650
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