is this an ok to drop a pulley size? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-05-2005, 11:24 AM   #1
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Default is this an ok to drop a pulley size?

I just got done doing a full tune up on my car, and before i did the tune up, my knock count was up to about 8 or 9 on a 5 minute run going up to around 65 mph. I scaned it again after everthing was done and now its 0 all the way up to 75. Would it be safe for me to drop another pulley size and not have to worry too much about more kr?
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Old 03-05-2005, 12:12 PM   #2
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Youre running 0 KR now, which is excellent, but you might see some show up if you drop to a 2.1 or something.
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Old 03-05-2005, 12:28 PM   #3
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What kind of a tune up did you do to get rid of the kr?
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Old 03-05-2005, 12:35 PM   #4
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i replaced my battery, plugs, plug wires, pcv valve, and fuel filter. i left my old air filter on there because it was still good. I think i also got my fuel curves right now, if not right then pretty close to it. My sig might be wrong, right now i have a 2.5" pulley, and i want to drop to a 2.2. Would the kr i would get with the smaller pulley outweigh the gains? remember im also going with a cam and some rockers with this setup too.
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Old 03-05-2005, 12:45 PM   #5
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Even initially, you shouldn't get much KR from a 2.2 inch pulley. Now, any smaller and it will outweigh the gains. Anyhow, with rockers and cams you should definitely be okay. When are you interested in a 2.2 inch pulley? I am thinking of demodding my car to sell it and I have just bought a 2.5 inch pulley. I might be able to sell you mine if you are interested. Let me know. Thanks
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Old 03-05-2005, 01:00 PM   #6
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A well-tuned 93 will get some KR with a 2.2" pulley on a hot day unless you seriously boost your octane higher to 94 or 95 at least.

Whether rockers or a cam would solve that remains to be seen. I'm probably camming also.
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Old 03-05-2005, 02:30 PM   #7
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I'd say wait for the cam/ rockers. Then try the 2.2. I wouldn't do it know though, not engough supporting mods. Do you have a PCM yet.
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Old 03-05-2005, 02:36 PM   #8
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I disagree completely. The injectors add nothing, but the CAI and exhaust are there. The only thing he'* lacking is the 180 thermostat. A PCM would help, but won't be required for the 2.2".
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Old 03-05-2005, 03:36 PM   #9
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Quote:
I disagree completely. The injectors add nothing, but the CAI and exhaust are there. The only thing he'* lacking is the 180 thermostat. A PCM would help, but won't be required for the 2.2".
My bad. I was thinking about the 94'-95'*. I which case I thought you had lost you're mind. Then I saw he had a 93'. DOH...
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