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Old 08-20-2009, 04:38 AM   #201
NSFW
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Crawford used Subaru's JDM twin-scroll manifold for Ken Block's car. Anybody know the inner diameter of the primaries on that header?
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Old 08-20-2009, 09:57 AM   #202
offset
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Quote:
Originally Posted by jagstyle View Post
Is the tiny runner diameter used on the perrins any good for high power rotated turbo setups (rotated gt3076r .82 on E85) or should I get something with larger diameter runners instead?
From what I have read and understood, the Perrins are better slightly lower HP setups, while something with a little bigger runners like the Gruppe-S EL headers work a little better on bigger HP setups. I would love to find some other good alternatives around this price range for bigger HP setups, just for the sake of having some options.

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Old 08-20-2009, 11:33 AM   #203
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Quote:
Originally Posted by offset View Post
From what I have read and understood, the Perrins are better slightly lower HP setups, while something with a little bigger runners like the Gruppe-S EL headers work a little better on bigger HP setups. I would love to find some other good alternatives around this price range for bigger HP setups, just for the sake of having some options.

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Has this been tested or is this just speculation?
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Old 08-20-2009, 12:30 PM   #204
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I have done personally testing and tuning on the Perrin ELH, WBR ELH, and iON UELH (very similar to GT-spec UELH). I have owned them all.

WBR spooled the slowest, and made the least power. I could run 20 psi at red-line with it, but would only flow about 305 g/s

iON spooled next fastest, made the most power. I could only run 18 psi at red-line, but flowed 310 g/s (less psi, more flow)

Perrin spooled the best, and lost a small amount of airflow to the iON.

My conclusion about headers (and TGV, and inlet pipe). The turbo can only flow so much air. Making things more efficient is always good, but many times on our cars does not result in much more power. Contrary to what all the vendors want you to believe, there is very little power to be had in any of them (300-330 whp set-ups).

Sure you may make 10 more whp at the same psi, but the turbo is now just at a slightly different spot on the comp map. If you tune both turbos to the same degree, you will end up with about the same whp (+/- 5), one set-up may just require a touch more boost then another.

If you go all out (flow as much as the turbo will do) on an alky or race gas tune, you will find the overall airflow will be the same.

That said, I like my Perrin headers, car is quieter, spools better, and supposedly results in more controllable EGTs, especially if you like road courses.
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Old 08-21-2009, 12:04 AM   #205
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Quote:
Originally Posted by NSFW View Post
Crawford used Subaru's JDM twin-scroll manifold for Ken Block's car. Anybody know the inner diameter of the primaries on that header?
38 mm in case of STI header. JDM LGT is notably smaller (32 mm IIRC).
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Old 02-12-2018, 11:12 AM   #206
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Another bump for re-host of the images.

The thread is of far less utility w/o them!
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Old 02-13-2018, 11:48 PM   #207
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Congrats to you for doing research and finding a 12 year old thread. I'm not even mad, I'm impressed.
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