Car won't 60, should I change rear gear?
#1
Car won't 60, should I change rear gear?
Race weight is 4150ish 4l80 with a 2.10 1st gear. 28.2 tall Mickey radials and 3.5 rear gear. My 60 is always between 1.34 and 1.39. I should be in mid/high 1.2s with the power I'm making I would think. I'm thinking the tall 1st gear is killing me
#2
TECH Enthusiast
Have to kill the power. That heavy, and that agressive of a first gear, especially on a radial is hard to make work.
Either need to change the first gear in the trans to a lower ratio, or kill power and ramp it back in.
Either need to change the first gear in the trans to a lower ratio, or kill power and ramp it back in.
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#9
whp, redline, and desire to optimize for 1/8 or 1/4?
#10
#12
At 4150lbs and 1400whp, your looking at ~130mph 1/8 trap. At 7K trap (before converter slip) equates to 4.56 rear gear and 9.58 SLR (closer where you should be). At 6% TC slip, trap rpm will be 7450 or use 4.30 gear for max 7K incl slip. If you up the whp, you'll need to lower (numerically) gear ratio to maintain target rpm with increased trap mph.
Last edited by tblentrprz; 07-18-2017 at 06:40 PM.
#17
Not calling you a liar, but that makes no sense. If you have all that extra s$%@... seems it would be heavier. My car, which is the same as yours....but with me in it weighs 3750. And I have no cage or heavy 9". Maybe your scale is suspect.
#18
the car is 3860 without me in it, its been weighed twice, lsx block, cage, 2 big turbos, piping. its not light. id have to have my converter loosened up. dont think i can get it to stall anymore than 43-4400 and 12 psi. im still kind of wondering if its something with the converter
#19
the car is 3860 without me in it, its been weighed twice, lsx block, cage, 2 big turbos, piping. its not light. id have to have my converter loosened up. dont think i can get it to stall anymore than 43-4400 and 12 psi. im still kind of wondering if its something with the converter
#20
9 Second Club
iTrader: (10)
the car is 3860 without me in it, its been weighed twice, lsx block, cage, 2 big turbos, piping. its not light. id have to have my converter loosened up. dont think i can get it to stall anymore than 43-4400 and 12 psi. im still kind of wondering if its something with the converter