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Old Jul 17, 2005 | 12:59 PM
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CAT3's Avatar
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Default Gearing question for racing...

Ok, on my 3.23's, I currently run the traps at 5300rpm in D running all motor at 11.79 @ 112mph. Once 3rd hits, I pick up slowly. My shifts are at 6900 and car pulls great until the big 3rd, then it gradually picks up. Running MT DR 275x50x15 (basically the 26x15). Should I go 3.73 or 4.10? I dont plan on keeping the rear or tire size this way for long, but until I swap to 9" and bigger tires what do you think?

TSP 231/237 112* cam, PP 5.3L heads, Level 2 Cmotor Trans, Fuddle 3800 Stall...

TIA

Charlie
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Old Jul 17, 2005 | 03:58 PM
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id try shifting sooner and see how that canges your times first. if this is striclty a race car then put as much gear in as your motor can handle, street car, i would say probably a 3.73
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Old Jul 17, 2005 | 09:29 PM
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Mix street and strip. Basically race it almost every w/e. I tried the lower rpms and when I started to raise it, she ran quicker. Only getting about 19mph in the top half, NA that is. Going to hit the nitrous soon, so might end up staying put.
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Old Jul 18, 2005 | 06:20 AM
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Originally Posted by CAT3
Ok, on my 3.23's, I currently run the traps at 5300rpm in D running all motor at 11.79 @ 112mph. Once 3rd hits, I pick up slowly. My shifts are at 6900 and car pulls great until the big 3rd, then it gradually picks up. Running MT DR 275x50x15 (basically the 26x15). Should I go 3.73 or 4.10? I dont plan on keeping the rear or tire size this way for long, but until I swap to 9" and bigger tires what do you think?

TSP 231/237 112* cam, PP 5.3L heads, Level 2 Cmotor Trans, Fuddle 3800 Stall...

TIA

Charlie
When I ran the 275/50/15 ET Street Radial with the 4L60E in my car I ran 4.11's in the 9" ..When running the same combo and going to a 26/10/15 ET Drag I had to go to a 4.30 because the ET Drag is considerably taller then the 275/50/15..I think your going to need at least a 4.11 to help the car trap better..

Right now I'm running 4.70's with a 28" tire and fixing to put 4.86's in it with a Turbo 400 setup in the car..
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