19 lbs of boost @ 5000 RPM on a M90? ITS POSSIBLE - Page 3 - 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 10-12-2004, 02:37 PM   #21
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I bet some of the Shop sponsored rides (ZZP INTENSE) etc will be interested in this. Pass it along to them?
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Old 10-12-2004, 02:38 PM   #22
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Matt, don't take any comments in here as negative. People are looking at the practicality of it, trying to plan ahead and get some questions answered, while you pursue the blower part of the equation. Just hashing it out logically. We need to look at things like inlet location, TB mounting (adapt a Thunderchicken TB maybe?) and stuff like that. And how to overcome the FWD and RWD arrangements.

And on a side note, you should see how many people around here run out and buy crap without looking into it like you are If everyone took good hard look at stuff first like you're doing with this, we'd have alot more money in our pockets.
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Old 10-12-2004, 02:38 PM   #23
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Quote:
I bet some of the Shop sponsored rides (ZZP INTENSE) etc will be interested in this. Pass it along to them?
Yes, maybe they can research a kit for the L67'*.
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Old 10-12-2004, 03:00 PM   #24
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Quote:
And on a side note, you should see how many people around here run out and buy crap without looking into it like you are
Guilty ....
thats why I have the 104 plugs instead of the 605'*

JLathem
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Old 10-12-2004, 04:31 PM   #25
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Well i'm now just waiting for a response from them. I asked if there is anything available in the meantime, but i'm expecting a big negative...

I am hoping they have something at least on the drawing board. Whatever the case, we'll find out soon!
Anyway, lets keep discussing. If anyone has concerns or ideas on this, now is the time to post them.
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Old 10-12-2004, 05:05 PM   #26
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The VE of an Eaton M90 is rumored to be 95%. Doesn't leave much room for improvement.
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Old 10-12-2004, 08:26 PM   #27
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Quote:
Originally Posted by willwren
The VE of an Eaton M90 is rumored to be 95%. Doesn't leave much room for improvement.
I thought it was lower than that? Why does it make so much heat then?
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Old 10-12-2004, 08:45 PM   #28
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Quote:
Originally Posted by willwren
The VE of an Eaton M90 is rumored to be 95%. Doesn't leave much room for improvement.
Correct, and to elaborate a little on that remember that the roots style supercharger is a positive displacement pump. Every rotation of the M90 moves ~90ci of air. I used the ~ because this number is effected by Volumetric Effeciency. This is simply its theoretical output vs its actual output. Such as if you had an M100 (100ci capacity) and only 90ci of air came out each revolution it would have a 90% VE. Some of the air slips between the rotors, which is why you '94+ guys have teflon coating on your rotors.

Anyway, no matter what you do each rotation will only ever pull ~90ci of air, expose the rotors, port the heck out of it, do whatever you want; the space between the lobes will only allow that fixed amount. Below is a chart outlining the volumetric effeciency of the M90



This is by the people over at zzperformance. This doesn't leave a lot to play with. Especially since its impossible to get to 100%. Surely not so much of an improvement to take it up to 19+psi. Also, roots style superchargers are NOT high pressure superchargers. They are not designed, nor do they do well, at that high of boost. You may see some of the larger displacement pumps pushing those numbers, but thats the cap on most of those also. My guess is somewhere in the fine print they spin the heck out of this thing.

Thoughts?
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Old 10-12-2004, 09:06 PM   #29
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20 PSI sounds cool.... blown lower end doesn't.
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Old 10-13-2004, 12:57 AM   #30
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remember they run it on an IC from the factory. I wish GM had been that thoughtful
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