Estimated HP gain with a 2.2" pulley? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-21-2007, 02:57 PM   #1
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Default Estimated HP gain with a 2.2" pulley?

What is the estimated gain with a 2.2" pulley? I am curious, as I might make a appointment to get some runs on a dyno with a before and after. I found a local one that has good prices.
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Old 12-21-2007, 03:09 PM   #2
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About 20hp and 30tq, properly tuned and with the right fuel pressure.

This is assuming no cracks in the EM'*, and all other things up to snuff.
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Old 12-21-2007, 03:17 PM   #3
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WOW

I really didn't expect it to that much. I know 20 hp really isn't a ton, but still much more then I expected, I was thinking around 5 - 10
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Old 12-21-2007, 03:58 PM   #4
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Quote:
Originally Posted by crash93ssei
WOW

I really didn't expect it to that much. I know 20 hp really isn't a ton, but still much more then I expected, I was thinking around 5 - 10
yes trust me it makes a HUGE difference

when i put on my 2.55 form the 2.8 even though i was getting KR in 2nd and 3rd gear... 1st gear i was getting non.

When i had the 2.55 on first gear i could just lite up the tires and bounce of the rev limiter did it by mistake because i did not think it was going to smoke the tires that much
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Old 12-21-2007, 04:34 PM   #5
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And this will add more torque than it will HP...

But make sure you are tuned for it and have no KR.... KR is engine death

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Old 12-22-2007, 02:11 PM   #6
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Got the pulley today.

Forgot to ask, do I need a larger tensioner pulley so the belt doesn't slip? If so, anyone have a part number for it?
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Old 12-22-2007, 02:23 PM   #7
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Yes, you need a 3.5" or you will get mad slip. Part numbers are in Techinfo.

http://www.bonnevilleclub.com/forum/...ode=cat&cat=18


Have you read the top article in this section:

http://www.bonnevilleclub.com/forum/...ode=cat&cat=20

Do you have a scantool and fuel pressure gauge?
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Old 12-22-2007, 02:32 PM   #8
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Oh yeah, damn I am empty-minded today. I forgot to check techinfo for the #'*.

I got my scantool, 0* KR everytime I check. Fuel pressure gauge is being picked up tonight.

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Old 12-22-2007, 03:16 PM   #9
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PS- Dont waste time at advance or auto zone. i could not fine the right pulley for the life of me.
Just goto NAPA and get one from there.
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Old 12-22-2007, 03:24 PM   #10
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AZ bozo'* look at you like , where the NAPA guys will say "Oh, you want an oversized.......this look right?" And they'll pull out a ruler to verify it for you.
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