Is a 4" intake pipe overkill

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Mar 18, 2008 | 02:13 AM

Banshee Ben

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Is a 4" intake pipe overkill

What do you think the efficiency if from a 3" to a 4".

I know the tb is closer to 3" but the easier it can take it...

I have twins running into two 2.5" inlets on the inter cooler then a outlet of undetermined size. Then straight to the TB.

Mar 18, 2008 | 07:22 AM

smokinHawk

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From: Columbus, ohio

my TB is 4" od which hooks up nicely to a 4" tube.
overkill, maybe if your trying to only make 500rwhp, but if your shooting for 1k rwhp, it might help some
my turbo has a 3" outlet, here i run that size tubing to my IC, where i made it have a 4" outlet, then that size tubing to the TB (no maf).

Mar 18, 2008 | 07:51 AM

Z06PSI

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From: Thomson, GA

Well 78mm roughly = 3"
90mm roughly =3.5"
100mm roughly = 3.9"

Choose accordingly.

Mar 18, 2008 | 10:16 PM

Beaflag VonRathburg

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From: Jax Beach, Florida

^ How about LT1 throttle bodies? I don't have one here to measure.

Mar 18, 2008 | 10:30 PM

Z06PSI

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From: Thomson, GA

52mm is 2.0 inches
58 2.28 inches

Mar 18, 2008 | 10:31 PM

Sideways240sx

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From: Byron, IL

i agree with the tb thing, but your intake is feeding your turbos. Then it is pushing past the tb. I would think what ever size the inlet is on the turbo is should be good, because you are not restricting the turbo. My inlet on my turbo is 5 inches, but i just put a 5 inch arifilter on it and called it a day.

Chris

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