RPM Shift Point Recomendations........

Manewaymja2 · Oct 4, 2009

Hey there guys, some of you may remember this car that i spoke of buying from a guy in Kentucky a while back with a built 302 / .30 over with allot of goodies. Well i finally got the car here in Nassau Bahamas after 3 mths and here are the results on which i was wondering where should i set my shift point at for running the 1/8th mile on drag slicks.

The Tune produced aprox. 400WHP and could have done more but kept it there due to Hyper pistons. The car is running a procharger 8psi of boost on 91 octane.
Here goes with the dyno results and then from there maybe someone can make some suggestions on a good shift point as to get the most out of the car. Please

RPM DJWhPw DJWhTq
3000 175 305
3100 186 313
3200 198 324
3300 208 331
3400 218 338
3500 229 344
3600 238 348
3700 251 356
3800 262 362
3900 272 369
4000 287 376
4100 300 383
4200 311 390
4300 321 392
4400 330 395
4500 339 396
4600 348 397
4700 356 398
4800 362 395
4900 370 393
5000 375 391
5100 380 388
5200 385 386
5300 390 381
5400 392 375
5500 393 369
5600 394 365
5700 390 360

Cobra912 · Oct 4, 2009

need info on gears, transmission, etc to really give opinion but I would say around 5500-5600 as your data indicates. I shift my paxton 1220SL / 331 combo around 5600 where it makes the most power.

dresmnkaos · Oct 4, 2009

i would set my shift light at 5400. by the time you react to the light you'll be 200 rpms higher and at the peak of your HP level. if you got some pretty high (numerically) gears then i may opt. to shift a little sooner than 5400. that way you can get to the next gear quicker to increase your MPH.

after you shift, if the rpms stay up around 3800, that thing is gonna be fun to drive.

Cobra912 · Oct 4, 2009

dresmnkaos said:
i would set my shift light at 5400. by the time you react to the light you'll be 200 rpms higher and at the peak of your HP level. if you got some pretty high (numerically) gears then i may opt. to shift a little sooner than 5400. that way you can get to the next gear quicker to increase your MPH.
after you shift, if the rpms stay up around 3800, that thing is gonna be fun to drive.

I'm not sure I understand what you are saying here. If you have steeper or numerically higher gears, you would have to shift sooner as the rpms will climb faster or be reached sooner than a numerically lower gear but I would think you would want to keep it in the optimum power band by shifting at the same shift point? It's all variable depending on tire type, size/diameter, transmission, gear ratio etc. so each car and driver is different.

Manewaymja2 · Oct 4, 2009

Ok the Gear Box is a Tremec TKO, The Rear Gears are 3.73's, The Tires are M/T Drag Slicks 26.0X10.0-15, Rims SPRTSTAR 15X8,5X4.5,5.5RS.

Thinking to run the tires say 14psi??????

Would i want to shift at the point that the car makes the most Torque or the Most WHP?

Thanks Guys

Cobra912 · Oct 4, 2009

I run 12-13 psi in my slicks. Best way to tell is get someone to see if it spins off the line with 14 psi. And check the pressure after every run as they warm up so too will the psi go up.

Manewaymja2 · Oct 4, 2009

OK will try the 12-13 psi.

Would i want to shift at the point that the car makes the most Torque or the Most WHP?

Ok the Gear Box is a Tremec TKO, The Rear Gears are 3.73's, The Tires are M/T Drag Slicks 26.0X10.0-15, Rims SPRTSTAR 15X8,5X4.5,5.5RS.

RPM Shift Point Recomendations........

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RPM Shift Point Recomendations........

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