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Making a Ported M90 Work?

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Old Oct 15, 2014 | 08:47 PM
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Default Making a Ported M90 Work?

So I've got a M90 on the shelf in the garage, just sitting there.

I want to install it as remote mount on my ls1 swapped 91 camaro. It has a 236/238 601 camshaft with longtube headers.

From my understanding, a stock M90 will become a restriction at higher RPM's. So my question is, if I port the M90 as much as possible and use the correct size pulley, will I see gains all across the powerband? I am not looking for crazy high HP numbers at all. Simply, all I want is a really fun street car, with a supercharger whine.

Or, is there absolutely no hope with gains from a M90?

BTW, I want to retain my stock hood, therefore the M90 appeals to me because it is on the smaller size of the superchargers. I can always upgrade to a procharger or magnuson later down the road.

Last edited by LSX Man; Oct 15, 2014 at 09:42 PM.
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Old Oct 16, 2014 | 04:06 AM
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Its designed for 2-5lt engines. You'd be spinning that thing out of its efficiency range. They are factory fitted to our v6 commodores in Oz, most lucky to reach 250rwkw on a 3.8 buick.
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Old Oct 16, 2014 | 05:28 AM
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You may gain a little torque down low, but after that it will be a restriction and dead weight. I wouldn't bother IMHO.
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Old Oct 16, 2014 | 08:18 AM
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https://ls1tech.com/forums/forced-in...5-m90-ls1.html
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Old Oct 16, 2014 | 11:07 AM
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If your dead set on it, a 5.3 might do better. Maybe even a 4.8.
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Old Oct 16, 2014 | 05:54 PM
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Get another, 2 should work
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Old Oct 16, 2014 | 07:35 PM
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Haha I would love to do two.

Looks like I am going to hold off until I can afford something larger.
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Old Oct 17, 2014 | 02:30 PM
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Originally Posted by TT427
Get another, 2 should work
Agreed! And look at Aston martins 90s vantage for some great ideas on mounting.
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