4.10's gears at the drag strip - Questions

[Nobody]

According to the calculators, the motor is turning 6,000 rpm at 108mph. I trap at 108mph now with my 3.55's. I think I will hit my rev limiter at the end of the track if I go with 4.10's. How do you work around this?

 

[85_SS_302_Coupe]

i crossed at about 5200 on 265/50/15s, in 4th.

 

[ninjacoupe]

Use a slightly taller tire on the rear.

 

[Mavrick]

How about 3.90 gears if you don't want to run a taller tire?

 

[Grn92LX]

My old combo crossed the line around 5500 with 373's on a 25.5" tire. I trapped around 109. Trap speed is NOT what you cross the line at. You are probably crossing the line at like 115mph since trap speed is the avg of the last 60' (or something like that) of the run.

 

[cleanLX]

6000rpm with 4.10's and a typical 26" tire is over 113mph... even useing a 25.5" tire is over 111mph...
to get to 108mph at 6000 with 4.10's, you've got to be on a 25" tire... that is a small tire.

At 108mph you travel that last 60 feet in 0.38 seconds.
No way in heck your vehicle is going to accelerate 7mph in .38 of a second, when it only accelerates ~20mph from the 1/8 mile to the 1/4 mile mark... approx 5 seconds, so, approx 4mph per second... so, approx 1.5mph is gained thru the traps for a vehicle trappin 108mph.
Even that assumes the car is accelerating as hard at the line, is is did as an average over the top half of the track.