10.3 in a 1/8 to 9.8 when i went from 3.08's to 3.73, then 9.8 to 9.3 when i went from 3.73's to 4.10's. Its worth every cent you will spend!
i must not know how to drive.... i went to track about a year ago, with my 373's and all my 60' were between 2.6-2.9 and my 1/4 mile times were around 14.9-15.3's
I would argue that on a manual transmission, you shouldn't gain more than .1 or .2 if you can drive well. Factory gearing is certainly cabable of 2.0 and 2.1 60' times, even on street tires; yes, it takes some practice to do that. Gears simply make it easier to get good 60' times because you don't have to play with the clutch so much. In my NPI with street tires on an average track with little to no prep, I get regular 2.1s by launching between 3000 and 3500, and slipping the clutch. I've even gotten a few 2.0s.
The biggest advantage I see to changing the gearing, is to make the gearing work out as you are crossing the line. On my NPI, I have to shift to 4th just before the finish line which hurts me. If I hold 3rd, it costs me several tenths and about 3mph. I'm also leaving a couple tenths on the table shifting to 4th so late because it is at the top end of the track. I make the shift to 4th and I end up crossing the line at 4000-4200 instead of 5k where I'd like to be.
The best gears will make your 1:1 gear (4th on a 5sp) rev to 100-200rpm above your peak horsepower as you are crossing the finish line. IE, if your peak power is at 5500, then you want to cross the stripes at around 5600 in 4th.
Yea maybe....jk
Your car stock runs a 15.... and a 2.6- 2.9 60'? wow.... dump that clutch and get moving!
you should be able to get a 2.10 2.0 pretty easy...
i went from 9.4 to 9.15 going from 3.08 to 3.90. miles per hour stayed the same.
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