What heat range for a 3.2" Pulley? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-19-2007, 04:43 PM   #1
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Default What heat range for a 3.2" Pulley?

I have been running my 3.2 for a few days now, My stock PCM is still in the learning process I think but I'm pushing around 12* of WOT timing at most times, ocassionaly during the the middle of second gear the KR count will spike from 0.0 to 2.0 or so. During 3rd gear, I've seen it jump to 3* of KR brining the timing advance back to 9*

So should I be running 1 heat range colder or 2 heat range colder plugs I'm running the autolite 105'* right now.

Would another heat range colder plug make any difference in KR or overall ignition timing or would they just end up fowling? I usualy swap a 3.4 for long trips on the car.....so take that into acccount....

If I get a PCM with 3* extra timing, would I notice increased KR since I'm probably at the limit of the stock exhaust manis as it is?
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Old 07-19-2007, 05:06 PM   #2
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You are making less power with the 3.2 pulley and less timing then if you put the 3.3 back on and got all 18 degrees. I would take the 3.2 pulley off.

If you put in a PCM with more timiing you will get more KR.
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Old 07-19-2007, 05:15 PM   #3
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Quote:
Originally Posted by OLDsman105
You are making less power with the 3.2 pulley and less timing then if you put the 3.3 back on and got all 18 degrees. I would take the 3.2 pulley off.

If you put in a PCM with more timiing you will get more KR.
the timing is the same with either pulley. nearly 100% identical. Only excpetion is I get 1* to 2* more KR with a 3.2 vs a 3.3. Butt dyno feels a difference with the 3.2. With a 3.4 I get no KR at all and timing around 14*. Stock I think I was at 15*
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Old 07-19-2007, 05:39 PM   #4
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Do you mean 104s now? I would try a NGK TR6 or Autolite 103. I also think at this level you really need to get some PEMs or Headers. I heard your oil pressure isn't that great... I would start saving for a new motor; heck my pressure wasn't bad and I got a rod knock and metal shavings in my oil now

Ed
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Old 07-19-2007, 06:07 PM   #5
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Don't quote me on this but I believe full timing on a Series 2 L67 stock is 18*.
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Old 07-19-2007, 06:36 PM   #6
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Max timing is 15 on an S2 however it may go over that if other adder tables see specific parameters. You are better off with the 3.4 and no kr then the 3.2 and 2-3 KR. As the weather cools down outside for the fall and winter you will make more boost than you are now and you will increase heat in the cylinder causing even more KR and possibly piston damage.

Do not get a PCM with extra timing if you are seeing KR currently. I would put headers on that car before I would even think about putting a 3.2 on it.
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Old 07-19-2007, 07:19 PM   #7
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ok, back to the 3.4 until I get some race gas then. I'm going to try 104'* and a 3.3 to see what that combo does.

Depending on my financial situation this winter I plan to build up another motor to throw in.
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Old 07-19-2007, 07:29 PM   #8
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Hans, I believe he said 'headers', not 'race gas'. He also said 3.4, not 3.3.

I'd personally take Todd'* advice as gospel and stick to it.
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Old 07-19-2007, 08:29 PM   #9
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Quote:
Originally Posted by willwren
I'd personally take Todd'* advice as gospel and stick to it.
I agree with that. I'm running my 3.4 and I have cam AND headers, I get 0 KR. With the 3.2 I was getting upwards of about 3 KR at higher RPMs. Changing to colder plugs is just a band-aid solution as would adding race fuel to the tank.
You want to get rid of KR completely, not just diminish it.
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Old 07-19-2007, 10:35 PM   #10
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KR MUST be killed by MECHANICAL means.
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