Intercooler piping size
#1
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Hey guys, I've been looking at intercooler kits on the market but i don't know if I should run 2" or 2.5"!
I'll be running a T25 turbo (2.5" inlet, 2" outlet) and I don't want too much restriction but I don't know if any problems arise from running piping that's too big! Any quick advice?![big grin](https://www.miataturbo.net/images/smilies/biggrin.gif)
Thanks!
edit: how does 2" pipping from turbo to ic then 2.5" from ic to engine sound?
I'll be running a T25 turbo (2.5" inlet, 2" outlet) and I don't want too much restriction but I don't know if any problems arise from running piping that's too big! Any quick advice?
![big grin](https://www.miataturbo.net/images/smilies/biggrin.gif)
Thanks!
edit: how does 2" pipping from turbo to ic then 2.5" from ic to engine sound?
Last edited by spitefulcheerio; 05-06-2011 at 01:24 PM.
#3
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Most of the engineering/science behind it is you want the speed of the air to stay below Mach 0.4. Temp has the biggest influence on the speed of sound (humidity does too not but a huge factor).
Generally you can get away with running smaller hotside vs coldside for this reason. (speed of sound is slower at colder temps)
With that in mind... for your power goals 2.0" all the way would probably be fine.
I run 2.25 hotside and 2.5 coldside. I think the FM kit does 2.0 hot and 2.5 cold...so that would be fine for your setup. Running 2.5 coldside is nice because the TB uses 2.5" coupler for it.
Generally you can get away with running smaller hotside vs coldside for this reason. (speed of sound is slower at colder temps)
With that in mind... for your power goals 2.0" all the way would probably be fine.
I run 2.25 hotside and 2.5 coldside. I think the FM kit does 2.0 hot and 2.5 cold...so that would be fine for your setup. Running 2.5 coldside is nice because the TB uses 2.5" coupler for it.
Last edited by aaronc7; 05-06-2011 at 02:22 PM.
#5
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Me too. 2" hot side, 2.5" cold side. 2" hot side is nice because it's slightly easier to route through tight areas. I'm running power steering and A/C. I believe there is less pressure loss in the pipe itself as well. It may be minimal anyway.
2.5" cold side works well also because my intercooler has a 2.5" cold side outlet. This combination nets me about 1 psi, maybe a hair less, total pressure loss.
2.5" cold side works well also because my intercooler has a 2.5" cold side outlet. This combination nets me about 1 psi, maybe a hair less, total pressure loss.
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