turbo header build Q's

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turbo header build Q's

Post  stanggt on November 29th 2011, 5:37 pm

Im building a 545bbf with twin s400 series turbos and need to know what size tubing to use for headers and also what size the hotside pipes should be. thanks
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Re: turbo header build Q's

Post  Northwest outlaw on December 1st 2011, 1:41 pm

If you are talking about the B/W s400 I think it is a 5" DP and tubes for the headers what heads are you running?
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Re: turbo header build Q's

Post  whatbumper on December 1st 2011, 2:42 pm

Most are 5" and they have a different taper than the Precision's and Garrett's. Stepping down to a 4" quickly after the flange is what most do.

NW outlaw can help you on tubing size. The only turbo headers for bb's that I have built were for a twin 91 car and they were 2.25" with a 4" hot side and 4" after turbo but the exhaust was only like 18" long each.

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Re: turbo header build Q's

Post  stanggt on December 1st 2011, 5:47 pm

Northwest outlaw wrote:If you are talking about the B/W s400 I think it is a 5" DP and tubes for the headers what heads are you running?
yes, the exaust is 5" but what size pipe should I run from headers to the turbos? 3" or 3.5"?The heads are SCJA Kasse heads. Thanks Outlaw, was wondering if anyone could help me here.
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Re: turbo header build Q's

Post  96Mustang460cid on December 1st 2011, 11:31 pm

I'm doing a single turbo 547 and decided to use 2", 14 gauge primary tubes to 2.5" collectors combining to a 3" as it goes to the turbo. I'd think that a similar setup should be fine for you too. All of that seems very small, but the exhaust gauge is under pressure.

Have a good day!
Michael
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