Polishing an M90 - Page 5 - 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 09-06-2006, 01:56 AM   #41
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1-4 quickly? If we can attribute that to the porting and polishing (from my experience on the 62, I think we can), that'* a significant gain by itself.
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Old 09-06-2006, 08:37 AM   #42
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You oughta feel the go pedal

Now I need an oversized tensioner. Anyone remember off the top of their head how large I go to make up .2 difference in pullies?
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Old 09-06-2006, 09:55 AM   #43
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Quote:
Originally Posted by BillBoost37
You oughta feel the go pedal

Now I need an oversized tensioner. Anyone remember off the top of their head how large I go to make up .2 difference in pullies?
if you have all stock pulleys I believe you go to a 3.5 pulley on the bottom SC Idler pulley.
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Old 09-06-2006, 01:12 PM   #44
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I just saw the vids...and WOW!!!!

Looks like fun, Bill!
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Old 09-07-2006, 06:47 AM   #45
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No way am I changing the lower idler until I have a need to take off the motor mount. It'* behind it in S2 B'villes.

I swapped up the tensioner to 3.5".. looks pretty good and an easy swap when you are doing the pulley.
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Old 09-07-2006, 01:20 PM   #46
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Quote:
Originally Posted by BillBoost37
No way am I changing the lower idler until I have a need to take off the motor mount. It'* behind it in S2 B'villes.

I swapped up the tensioner to 3.5".. looks pretty good and an easy swap when you are doing the pulley.

I know I have to change that pulley today on my car. I thought a 3.5 pulley on the tensioner would hit the mount ? How is the PCM relearning the pulley now?
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Old 09-07-2006, 02:18 PM   #47
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And underdrive waterpump pulley hits the mount. A 3.5 fit great on the tensioner.

Today is pretty good.. you know the weather.. nice...cool...

Checked a couple things Rogue clued me in on.. awaiting a shipment from Intense.
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Old 09-07-2006, 02:39 PM   #48
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Quote:
Originally Posted by BillBoost37
And underdrive waterpump pulley hits the mount. A 3.5 fit great on the tensioner.

Today is pretty good.. you know the weather.. nice...cool...

Checked a couple things Rogue clued me in on.. awaiting a shipment from Intense.
what pray tell is in that box?
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Old 09-07-2006, 03:01 PM   #49
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Adjustable fuel pressure regulator is in there!
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Old 09-07-2006, 11:12 PM   #50
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Ahaaa

The old adjustable fuel pressure regulator trick

That'* what worked for me last couple of years. Raise the pressure by about 4-6 psi and that will kill your KR with a little bit of cool richness.

I have mine set at 58 psi. Stock was 52 psi max.
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