RPM's = MPH? HELP!

teamjkd · #1 (**permalink**) 10-14-2003, 07:49 PM

Need help to fix a screw up. I installed a New Image flame gauge face replacement. It looks awesome, but my tach needle is way out of wack! I'm hoping someone could check their rpm to mph and post their results. Like rpms to 40mph & 60mph from a dead stop? Also rpms at 65 hwy cruisin? The more info the better. I have a 2000 SR5 4x4 TRD. Please help me get my wifes " I TOLD YOU SO" look off her face!

woody1 · #2 (**permalink**) 10-14-2003, 11:34 PM

And I thought when logging data, using cruise control for at least 2 mile on level roads, was being an excessive compulsive engineer collecting worthless data..... hope this helps
40=1500
55=1800
70=2200
75=2400
80=2550
85=2700
90=2900

Agent WD-40 · #3 (**permalink**) 10-15-2003, 02:30 AM

Quote:

Originally Posted by woody1

And I thought when logging data, using cruise control for at least 2 mile on level roads, was being an excessive compulsive engineer collecting worthless data..... hope this helps

Haha. That plays great into the stereotype.

teamjkd · #4 (**permalink**) 10-16-2003, 02:08 AM

The info really helped thanks!

Agent WD-40 · #5 (**permalink**) 10-18-2003, 03:06 AM

woody1, what size tires do you have on your truck? I see you have 17" rims. Is the OD on your tires comparable to the 265/70/16?

Do you think if you were to jack up the rear wheels and accelrate so the speedo said 70mph (assuming the speedo is correct) you can set your tach? Or will the lack of a load make that not work out given we have an automatic?

woody1 · #6 (**permalink**) 10-19-2003, 02:27 AM

RPM vs Speed posted were with OEM tires.
I'm running Falken P275 R60 17, Diameter basically the same as OEM; same observations ±2%.