What size headers will make the most power for turbo

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Mar 10, 2008 | 04:44 PM

crazycat

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From: upstate N,Y

What size headers will make the most power for turbo

Hi I am doing a front mount single gt45 turbo t6 76mm on my 383 LT1. I am making the headers for the turbo myself. Whats the best diamiter pipe to use, I was told smaller was better because it would give the gases more speed to spool the turbo, Is this true ? Also Will I make more power If I make the tubes on the headers egual ? If the header tubes are longer before I join them to merge is that better ? thanks...

Mar 10, 2008 | 06:22 PM

2000 Tran Zam

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From: Ahwatukee, Az

All I know is on STS systems they recommend using stock manifolds... So I would suggest doing the same thing or similar with your lt1 (dont know how well they flow).

Mar 10, 2008 | 06:24 PM

cjg454ss

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stock 6.0 manifolds have been pushed to 1500rwhp, not sure about the lt1 manifolds. but jusst an fyi

Mar 10, 2008 | 06:55 PM

SS4Matt

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From: West Bloomfield MI

i built my turbo kit using 1 3/4" stainless for the headers, got some nice formed collectors from Stainless Works i believe it was, and then used 2 1/2" stainless for the crossover from the headers to the turbo. then just a 4" downpipe from my turbo all the way out.

Something along those lines is desirable.

Mar 10, 2008 | 07:55 PM

crazycat

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From: upstate N,Y

O.K thanks, But are longer tubes better than say a block hugger right into a single pipe all the way to the turbo. thanks

Mar 11, 2008 | 12:31 AM

SS4Matt

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From: West Bloomfield MI

Quote:

Originally Posted by crazycat

O.K thanks, But are longer tubes better than say a block hugger right into a single pipe all the way to the turbo. thanks

by a "single pipe all the way to the turbo" do you mean a log type manifold like the old phamspeed kit? then Yes. a tubular header is better, but like others are saying; the 6L truck manifolds that most people use for their "budget ls1 turbo builds" is a very proven unit. considering Ohio Boys have gone what... mid 7's with them and you can pick them up for free pretty much.

i think i have a set of 6L manifolds with stainless works flanges sitting in the back of the shop from my original plans which have changed since then.

Mar 11, 2008 | 08:41 AM

Beaflag VonRathburg

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From: Jax Beach, Florida

Ideally you want to base the pipe diameter on how much exhaust gas the engine flows. A good base would be 1-5/8 tubing. Along the same lines you want the headers to be equal length and the shorter the better for quicker spool.