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Old 01-23-2019, 11:47 PM   #16
Screwblower
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Default Re: Turbo header primary size

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Originally Posted by joemondo View Post
Or you can always treat it like a blower car and slap some 2" primaries on there.
I did with 3 inch crossover.
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Old 01-27-2019, 04:18 PM   #17
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Default Re: Turbo header primary size

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Old 10-11-2019, 04:51 PM   #18
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Default Re: Turbo header primary size

What about a higher rpm setup with twin gt45's? I believe my primaries are 1-3/4" OD. 1200 hp less than 20 psi boost.
How critical is the primary size? Is the 1-3/4" marginal for this setup?
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Old 10-11-2019, 11:46 PM   #19
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Default Re: Turbo header primary size

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Originally Posted by tempname View Post
What about a higher rpm setup with twin gt45's? I believe my primaries are 1-3/4" OD. 1200 hp less than 20 psi boost.
How critical is the primary size? Is the 1-3/4" marginal for this setup?
Header size shouldn’t be equated to hp made or potential on a turbo setup. Jmo.
Match the port that is all.
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Old 10-12-2019, 10:17 AM   #20
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Default Re: Turbo header primary size

should have saved your 450 bucks if it's just a 5.3 and not some max effort combo
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Old 10-12-2019, 08:38 PM   #21
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Originally Posted by 93hatch View Post
should have saved your 450 bucks if it's just a 5.3 and not some max effort combo
Who has a 5.3?

Actually I measured and mine are 1-5/8”
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Old 10-13-2019, 06:00 PM   #22
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Default Re: Turbo header primary size

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Originally Posted by joemondo View Post
Or you can always treat it like a blower car and slap some 2" primaries on there.
I have 2” primaries on a 434 SBC and have yet to see an issue with it or the previous 383 they were on. Twin precision 76’s spool in 1.2-1.5 seconds to 12 psi on the brake.
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Old 10-14-2019, 05:25 PM   #23
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Default Re: Turbo header primary size

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Originally Posted by Screwblower View Post
Header size shouldn’t be equated to hp made or potential on a turbo setup. Jmo.
Match the port that is all.
Agree. I simply ported the truck manifolds I'm running, to match my TFS heads
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