Cool Can Revisited
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Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Cool Can Revisited
(This is the '57, but all of the principles apply to 3rd gens.)
After going out earlier than I thought I should have at Super Chevy, due to dial-in inabilities, I went home and made that coffee can into a cool can. I went out last Wednesday to test & tune to give it a whirl. Also had slicks on for the 1st time (had ET Streets for SC).
Okay, slicks had the desired effect on 60' times - not better, necessarily, but more consistent. That typically means 1320' times are going to be more consistent, too.
But, wasn't always the case. It still would fall over at the 1-2 shift and before the 2-3 shift from time to time.
So, rechecked the timing after 2nd run - dead on where I had set it, 40 degrees at 2500 RPM. But, for some reason, I went on up to 4000 RPMs, and was surprised to see it add a couple of more degrees. Took it to 5000, timing jumped back & forth about 4 degrees each side.
I backed the timing off a couple of degrees to see what would happen for the next 4 runs I was able to get in. Seemed a little better.
Next day, got an MSD in-cap HEI coil to replace the GMPP coil. Now timing was steady past 5k (although still gained a couple of degrees above 4000). Took it out for Bracketnationals Friday and Saturday. Managed to go a few rounds for a change (including semi-finals on Saturday). I was entered in more than one race both days, and had to do some hot-lapping - cool can really came in handy then. Never fell over once all weekend.
Moral of the story - Perhaps you have a fuel delivery issue, but make sure you track down and eliminate all ignition issues as well.
After going out earlier than I thought I should have at Super Chevy, due to dial-in inabilities, I went home and made that coffee can into a cool can. I went out last Wednesday to test & tune to give it a whirl. Also had slicks on for the 1st time (had ET Streets for SC).
Okay, slicks had the desired effect on 60' times - not better, necessarily, but more consistent. That typically means 1320' times are going to be more consistent, too.
But, wasn't always the case. It still would fall over at the 1-2 shift and before the 2-3 shift from time to time.
So, rechecked the timing after 2nd run - dead on where I had set it, 40 degrees at 2500 RPM. But, for some reason, I went on up to 4000 RPMs, and was surprised to see it add a couple of more degrees. Took it to 5000, timing jumped back & forth about 4 degrees each side.
I backed the timing off a couple of degrees to see what would happen for the next 4 runs I was able to get in. Seemed a little better.
Next day, got an MSD in-cap HEI coil to replace the GMPP coil. Now timing was steady past 5k (although still gained a couple of degrees above 4000). Took it out for Bracketnationals Friday and Saturday. Managed to go a few rounds for a change (including semi-finals on Saturday). I was entered in more than one race both days, and had to do some hot-lapping - cool can really came in handy then. Never fell over once all weekend.
Moral of the story - Perhaps you have a fuel delivery issue, but make sure you track down and eliminate all ignition issues as well.
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