Replace M62 with M90 or M112 - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 04-20-2005, 01:53 AM   #31
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Old 04-20-2005, 06:24 PM   #32
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why not have them buy a new one, keep your old one, spend $70 on the parts, repair it, and then sell it as rebuilt on ebay for $400 like the other people do... new supercharger and $330 net to spend on mods
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Old 04-21-2005, 10:27 PM   #33
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Quote:
Originally Posted by matt95ssei
Go with an M112. Imagine how fun it would be? And for the "too much boost" simply slap a bigger pulley on it until you want that extra power which will be available with much less KR due to the lower intake temps obtained by the m112 producing the same boost as a m62 but at a lower speed (less friction = less heat = denser air + less K.R)
You’re not totally right here. When you compress air it creates heat. Yes I'm sure when supercharger rotors are spun faster heat is created because of friction but this heat is marginal at most. You would gain a good amount of HP with spinning a supercharger slower just because it would take less HP to spin the supercharger pulley.[/quote]
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Old 04-21-2005, 10:49 PM   #34
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It requires DEEP thinking. The 112 takes more hp to drive than the 62 or 90, but it provides more FLOW per stroke, so you can spin it slower. You really have to do the math to see where the break-even point is.

More PRESSURE (indicated in boost PSI) isn't really what we're after here. We only use it as a reference when dropping pulley diameters. Flow in CFM is what'* key, but not at the cost of hp, and the 112 may just require more hp than we'd gain from it, due to the larger rotating mass.
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