What a Day!! 99 L67 TB to Sonoma.....TOG's/3.2" MPS to - Page 2 - 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 09-24-2006, 10:42 PM   #11
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Porting the outlet by increasing it'* size generally isn't good practice. The outlet isn't the restriction, and you can decrease the Supercharger'* efficiency. The INLET is the problem.
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Old 09-25-2006, 09:38 AM   #12
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Correcting certain inefficiencies at the inlet and cleaning up the roughness inside can make good improvements.
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Old 09-29-2006, 12:09 AM   #13
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Bad news for me.

Some kid with 98 Grand Prix GT found the 00 GTP with TOGS and swapped the exhaust and manifolds before I could get mine off my GTP parts car.

So I only get the junk motor, ported SC with nherbst454 3.2" MPS, and 3/4" phenolic TB spacer.

I talked to the kid, thinking he might have lost some power as I did when I put the 3" exhaust on my Series I L67, but he says he has so much more power now over 30 mph. (I was hoping otherwise) :(

I am going to offer him $250 and a set of ceramic coated/ported manifolds for them but in about 2-3 weeks.
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Old 09-29-2006, 09:08 AM   #14
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You called to tell me about parts that weren't in your hands already?

Sorry to hear...
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