92-93 L67 owners looking for more power - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 03-04-2008, 01:48 PM   #1
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Default 92-93 L67 owners looking for more power

This probably has been discussed before, but I just had the micrometer out and checked the inlet of the GEN II M62 and found it to be 62.xx MM.
I then checked the outlet of the TB and found it to be 59.40 MM.

If you can find a shop to open the TB up 2.5MM you'd be seeing about a 5% (or more) flow capability from the TB, and more boost. Combine with a 2.2 or 2.3" SC pulley, non cracked and ceramic coated exhaust mani'* and you could really feel the extra power no doubt.
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Old 03-04-2008, 03:34 PM   #2
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And now you're going to recalculate based on throttle plate diameter, which is actually the biggest restriction?

http://www.bonnevilleclub.com/forum/...ighlight=story



57.85mm on the plate. You can see all the dimensions you just measured here too, other than the inlet of the SC. As long as it'* bigger than the plate diameter, there'* not much to gain (not 5% certainly).
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Old 03-04-2008, 03:59 PM   #3
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It wouldn't hurt to smooth out the TB-SC transition, though. Enough to justify the cost? I dunno.
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