RPMs for 3.08-4.1 rear gears and the A4 at diffrent speeds

[BillyCobin]

Since everyone asks about gas milage and RPMs if they switch gears, I thought I would make a chart to help visualize it. I used Dom's equation that he posted in another topic to make the chart. For tire size I used 26.2 inch diameter. This I determined from here. I used the tire size 215/60R16.

The transmission ratio was determined on a 1996 Camaro convertable with a 4L60-E transmission using AutoTap.

I looked through a few posts about gear swaps, and the RPMs in the chart seem to line up fairly well with the real world numbers members are posting.

rpm = (mph x gear ratio x 336) / tire daimeter

-----------------Reverse (2.28)-------------
mph-----3.08----3.23----3.42----3.73----4.1
15------1350----1416----1499----1635----1798
30------2701----2833----2999----3271----3596
45------4052----4249----4499----4907----5394

-----------------1st Gear (3.05)------------
mph-----3.08----3.23----3.42----3.73----4.1
15------1807----1895----2006----2188----2405
30------3614----3790----4012----4376----4810
40------4818----5053----5350----5835----6414
45------5421----5685----6018----6564----7215

-----------------2nd Gear (1.68)------------
mph-----3.08----3.23----3.42----3.73----4.1
30------1990----2087----2210----2410----2650
45------2986----3131----3315----3616----3975
55------3649----3827----4052----4419----4858
65------4313----4523----4789----5223----5741
75------4976----5219----5526----6027----6625

-----------------3rd Gear (1.00)------------
mph-----3.08----3.23----3.42----3.73----4.1
55------2172----2278----2412----2530----2891
70------2764----2899----3070----3348----3680
85------3357----3520----3728----4065----4469
100-----3949----4142----4385----4783----5258
120-----4739----4970----5263----5740----6309
140-----5529----5799----6140----6696----7361

-----------------4th Gear (.69)-------------
mph-----3.08----3.23----3.42----3.73----4.1
55------1498----1571----1664----1815----1995
70------1970----2000----2118----2310----2539
85------2316----2429----2572----2805----3083
100-----2725----2858----3026----3300----3628
120-----3270----3429----3631----3960----4353
140-----3815----4001----4236----4620----5079
160-----4360----4573----4842----5280----5804

[ July 07, 2002: Message edited by: BillyCobin ]</p>

[Silver3800V6FBodyKY]

Those are good charts, but they're not exactly right. In forth gear, it takes me about 2700 RPMs to cruise at 70, where your chart says 2539. Good work though with the charts. That must have taken awhile unless you have a programmable calculator.

[99Camaro99]

For 3.42s, you're a tad bit off, CLOSE, but a tad off. Here are some numbers for ya

1st gear redline = 40MPH +/- 2MPH
2nd gear redline = 77MPH =/- 2MPH
3rd gear redline = 118MPH fact :D

4th gear crusing
1000RPM - 40MPH
1500RPM - 48MPH
2000RPM - 62MPH
2500RPM - 82MPH
3000RPM - 96MPH

hope this helps