How do you determine the diameter of I/C piping?
Thread Starter
Joined: Nov 2004
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From: 03 Sedona WRX
How do you determine the diameter of I/C piping?
i'm in the process of putting together a turbo mustang. Nothing super fast, just a built 351w based engine with a big single on it.
my goal is modest at only 500-550whp on pump...and i doubt i ever really tune for race gas, unless i get really bored on weekend.
so i'm just trying to figure out what diameter of i/c pipe i'm going to run.....and i wasn't sure if there was some kind of calculation to go by, or if you base it off hp figures..or what...
any help would be appreciated
my goal is modest at only 500-550whp on pump...and i doubt i ever really tune for race gas, unless i get really bored on weekend.
so i'm just trying to figure out what diameter of i/c pipe i'm going to run.....and i wasn't sure if there was some kind of calculation to go by, or if you base it off hp figures..or what...
any help would be appreciated
Honda-Tech Member
Joined: Sep 2003
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From: Boost is good
Re: How do you determine the diameter of I/C piping? (rhd)
Maybe the piping from turbo to intercooler, the same size as the outlet on turbo?
and from intercooler to TB... Run a pipe exactly the same size as the throttle body inlet?
Thats what I would at least do. 
and from intercooler to TB... Run a pipe exactly the same size as the throttle body inlet?
Thats what I would at least do.
Honda-Tech Member
Joined: Mar 2001
Posts: 4,408
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From: Somewhere in California
Re: How do you determine the diameter of I/C piping? (rhd)
posted in the FAQ:
https://honda-tech.com/zero...02591
From what I've read your piping size should be matched up to the amount of airflow your turbo setup is going to have. But usually for the compressor to intercooler inlet people run the same size pipe as the compressor outlet. Then from intercooler outlet to TB you can run either a 2.25" or 2.5" piping. I dont think it would be a good idea to match piping size with your TB, because if you have a large TB (2.75"+) then you might end up going with a piping diameter that is too big.
https://honda-tech.com/zero...02591
From what I've read your piping size should be matched up to the amount of airflow your turbo setup is going to have. But usually for the compressor to intercooler inlet people run the same size pipe as the compressor outlet. Then from intercooler outlet to TB you can run either a 2.25" or 2.5" piping. I dont think it would be a good idea to match piping size with your TB, because if you have a large TB (2.75"+) then you might end up going with a piping diameter that is too big.
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