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FYI-3.90 to 4.33 gear change result

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Old Nov 7, 2004 | 11:20 AM
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From: Bordentown, NJ
Car: 82 Camaro Z/28
Engine: 383 SBC
Transmission: TH350
FYI-3.90 to 4.33 gear change result

Finally got to take it out and was able to get 3 time runs in. Previous best single pass with 3.90's was 11.55@117.83 with a 1.548 60ft. First run spun the tires a little and bounced it off the rev limiter in 1st, ran 11.705@117.81 with a 1.60 60ft. Second run, took out some air in tires and moved down shift point, still spun a bit and tickled the rev limiter in 1st, ran 11.638@117.74 with a 1.584 60ft. Third run did the same air out and and took down shift point again, hooked better with just a little skip and didn't hit the limiter and ran a 11.531@117.62 with a 1.548 60ft. New best but not by much. I think there is a little more to be had in the 60ft, gotta get some more time with it, I still rev'd a little over where I normally shift in 1st. Overall I'm pleased with the way the car feels, it feels like it's charging to the finish line hard, I just got to relearn how the car likes to be driven. I was hoping for a little better but that's how I made out so far.

Last edited by SS CAM; Nov 7, 2004 at 11:23 AM.
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Old Nov 7, 2004 | 06:45 PM
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From: Medford, Oregon
Car: 1989 Iroc Z L98
Re: FYI-3.90 to 4.33 gear change result

Originally posted by SS CAM
Finally got to take it out and was able to get 3 time runs in. Previous best single pass with 3.90's was 11.55@117.83 with a 1.548 60ft.
How much does your car weigh out of curiosity? What are the specs on your camshaft?

Moderator edit: Full quote of a previous message isn't required.

Last edited by AlkyIROC; Nov 7, 2004 at 07:35 PM.
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Old Nov 8, 2004 | 04:54 PM
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SS CAM's Avatar
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From: Bordentown, NJ
Car: 82 Camaro Z/28
Engine: 383 SBC
Transmission: TH350
Unknown, race weight is about 3450. Cam is Comp solid flat tappet small base circle magnum cam. Lobe sep 110, gross lift .534 intake and exhaust with 1.5 ratio rockers however I'm running with 1.65 ratio rockers, duration @ .050 intake and exhaust is 250.

I was down to 13psi in 28x12.5 ET Streets on last pass, I think I could take out another 1/2 lb or so and was wondering what some of you guys were running on similar tires?

Last edited by SS CAM; Nov 8, 2004 at 05:08 PM.
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Old Nov 8, 2004 | 05:01 PM
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From: Medford, Oregon
Car: 1989 Iroc Z L98
Awesome setup you have, thanks for the post! Any port work done to the heads?
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Old Nov 8, 2004 | 05:23 PM
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From: Bordentown, NJ
Car: 82 Camaro Z/28
Engine: 383 SBC
Transmission: TH350
Unknown, Thanks man, it's alot of fun, well at least when things go right No port work done to the heads they're out of the box Dart Pro 1 215 aluminum's.
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