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Old 10-20-2003, 08:38 PM   #1
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Default Hello Im new and need advise!

My name is Mike Im from Southern CA I have a 95' pontiac supercharged SLE engine mounted in my offroad car so I cant tell you how fast it is in the 1/4 or what kinda stereo I have but with all the smog BS and the factory computer replaced with a link system I made 292 hp and 342 lbs or torque I bought the engine this way it runs good but Im going to upgrade and have some work done like a custom exhaust made, bump0 up the timing install a new cam, and wanted to know if going to smaller puller is worth it its already so small compared to a series II, so any help would be great, Thanks Mike
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Old 10-20-2003, 09:42 PM   #2
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Welcome to the club! Got pictures of this beast? What is the size of your pulley your running now?
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Old 10-20-2003, 10:43 PM   #3
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I bet it'* a 2.8" pulley. Go to www.pulleyboys.com and order the 2.5". It'* worth the money.
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Old 10-20-2003, 11:29 PM   #4
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yeah Im trying to get some pics up so you guys can check it out I saw one guy was running a 2.0 pulley is that to small and will it slip on the belt at high RPM'* remember my computer is totally tunable via lap top so I dont have to worry about running into a lean condition whats the stock boost and how much boost are these SC capable of running? I want to get the right one Im going to dyno the car in about a month and I want the right pulley to see a decent increase in hp, Thanks Mike
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Old 10-21-2003, 02:53 AM   #5
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Anything smaller than 2.5 is gonna cause knock, and get into the heat-loss inefficient zone of the M62. Your performance will actually decrease at a certain point if you go smaller.

If you're worried about belt slip, do what I did. Go to www.zzperformance.com and buy the oversized idler pulley. It'll give you a little extra belt wrap around the smaller pulley, and helps you keep the stock belt length.
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Old 10-21-2003, 03:02 AM   #6
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I don't have any advice to offer, but I will add my request for pics! And welcome to the nuthouse!
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Old 10-21-2003, 12:49 PM   #7
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Quote:
Originally Posted by willwren
Anything smaller than 2.5 is gonna cause knock, and get into the heat-loss inefficient zone of the M62. Your performance will actually decrease at a certain point if you go smaller.

If you're worried about belt slip, do what I did. Go to www.zzperformance.com and buy the oversized idler pulley. It'll give you a little extra belt wrap around the smaller pulley, and helps you keep the stock belt length.
willwren, sounds good to me but I can get rid of knock by ajusting the maps in my computer and can I ask why you run a pulley boys 2.2" and not a 2.5" pulley? Thanks Mike oh yeah and I have a very large intercooler Im running before the throttle body so that should help keep the SC cool!
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Old 10-21-2003, 01:29 PM   #8
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Dirty, I run a 2.2 because my stock pulley was a 2.55". That'* true for the 92/93. 94/95 had a 2.85" pulley stock.
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Old 10-21-2003, 08:06 PM   #9
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Quote:
Originally Posted by willwren
Dirty, I run a 2.2 because my stock pulley was a 2.55". That'* true for the 92/93. 94/95 had a 2.85" pulley stock.
so in your eyes going lower than a 2.5 is a waste or just too small?do you know about how much boost that will produce I dont even know what my stock boost is I need a gauge
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Old 10-22-2003, 02:57 AM   #10
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If you're running an intercooler, you could go smaller, but remember, the wear and tear on the SC is dramatically increased at the higher rpms.

Stock boost should be about 8-9psi at WOT. You should gain about 2 psi going from the 2.8 to the 2.5. Roughly 20-25 horsepower.
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