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Old 09-29-2007, 03:42 PM   #1
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Default Pully question

I'm considering adding headers to my 97 and I'm wondering how small can I go with my SC pully. Can I go below a 3.4"? or will I run in to KR problems. Also, what will be the ball park estimate on HP increase from stock manifolds and stock SC pully. Thanks.
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Old 09-29-2007, 07:45 PM   #2
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there is no magic formula to say what will and what wont give you KR

Typically, you need rockers and the headers/PEM'* before you can put on the 3.2....

I dont see a PCM listed in the Mods either....
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Old 09-29-2007, 09:42 PM   #3
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Get a scantool or scangauge first. Then try a pulley or two and see what your car will tolerate.

I suggest waiting until you get a PCM. Seems the S2 really favors a PCM to get the most out of a 3.4" pulley with no KR.
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Old 09-29-2007, 09:46 PM   #4
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so with the mods he has, a PCM will probbaly yield no KR?
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Old 09-29-2007, 09:59 PM   #5
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I didn't say that.

Some cars can step to a 3.5, some to a 3.4. The only way to know is to be able to scan.
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Old 09-29-2007, 10:15 PM   #6
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Scanning is key!

I had a FWI, TOG headers w/ full exhaust and a Intense standard PCM on my old L67 and I stuck with a 3.4" I probably would have dropped to a 3.3" but I spun a bearing before I was able to scan.


But if you do get headers I would say it would be relatively safe to go to a 3.3".

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Old 09-30-2007, 12:02 AM   #7
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I do plan to get a PCM as well, didn't mention that, sorry. I figure I'll try a 3.4 first and see how that goes, then perhaps try a 3.3 and see how it works. I can always go back to a 3.4 if it'* a problem.
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Old 09-30-2007, 12:23 AM   #8
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3.3? No way.

3.5 or 3.4"
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