DrJay's Performance rebuild...PART TWO! - 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 12-25-2004, 10:24 PM   #1
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Default DrJay'* Performance rebuild...PART TWO!

Closed due to cleaning......
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Old 12-25-2004, 10:34 PM   #2
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Git er Done !!
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Old 12-25-2004, 10:36 PM   #3
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This is really gonna give some of the bigger SII guys some real thinking to do!!!
So, a 11 second Series I Bonneville whooping Z06'* just might become a reality!!!! Minus broken rods or pistons.
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Old 12-26-2004, 12:06 AM   #4
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Your gonna make the CGP guys angry! Good luck with the build!
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Old 12-26-2004, 12:20 AM   #5
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I think you're going to run into the problem that your blower is actually going to become a restriction instead of adding power. That little tiny M62 can only flow so much air. I think you're gonna need a bigger blower. Zooomer is putting out 410whp (so a little over 500 crank hp) and his P&P'ed M90 is maxed out. So, your M62 is gonna max out way before that...

Shawn
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Old 12-26-2004, 12:38 AM   #6
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Old 12-26-2004, 12:57 AM   #7
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ok, i think i need to come over for a day and learn from these things that your doing. I just got a CAI and i thought i was fast
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Old 12-26-2004, 12:57 AM   #8
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There is a point when droping a pulley size is not going to help you because the M62 is not efficent enough anymore. If that wasn't the case you'd see people with M90'* running 2" pulleys and such. Just my .02

One ? - the boss ok'd it? elaborate please?

Anyway you look at it good luck!
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Old 12-26-2004, 01:00 AM   #9
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Quote:
Originally Posted by llBlazin_llLo
One ? - the boss ok'd it? elaborate please?
I'm assuming his GF, or someone else who has a hand on the $$$ coming and going.
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Old 12-26-2004, 01:07 AM   #10
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Quote:
Originally Posted by DrJay
Hmm..not sure I follow what you mean by "maxed out." If I make even 1psi then the supercharger is obviously flowing more than the engine is. I'm fully expecting a substantial drop in pressure, but if I felt so inclined I could use a 2.0" pulley...could you elaborate a little?
So lets say the supercharger is making 1psi. You would have so small of a pulley on it so that it would make that 1psi, that if you took the blower off the difference in air temperature would make up for the 1psi boost you lost, you follow? A 2" pulley is going to create so much heat because it brings the blower out of its efficiency range, that it would be more worthwile to run a larger pulley due to the temperature of the outlet air. This is why you don't see very many people running smaller than a 2.55" pulley on an M90, because if you go smaller than that, it isn't going to be efficient enough to make more power. Yeah, you could throw a 2.35" pulley on it, and spin it faster, and yeah, it would move more air, but the air is so hot that you are actually losing power because you are having to pull timing to make up for the huge amounts of heat the blower is producing. To make the kind of power you are hoping to make, you're gonna have to go with a bigger blower. Personally, I would put a M112 on it, but an M90 would at least be better than the M62. Or just go with a different power adder altogether.

Shawn
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