RPM calculator for gear changes

12-29-2000, 08:54 PM

Hey, Randy's Ring and Pinion has a great calculator to find what RPM you'll be spinning with size "X" tires and gear "X". It even figures out the tire height and tells you the RPM for manual or auto. the site is www.ring-pinion.com.

lx mike · 12-30-2000, 03:49 PM

we have the same thing here, called the analyzer, i went and check that link out and it is good for finding tire sizes the analyzer we have here give more info such as: for each gear, rpm's for each 10 mph and also mph for each 100 rpm's very helpfull for figuring cruise speed and also can help with shift point if u know your hp curve.

[This message has been edited by lx mike (edited 12-30-2000).]

MiracleMax · 12-30-2000, 09:57 PM

Hah, depress yourself with the optimum shift point calculator at http://www.prestage.com/

Inputing the ratios for a T-5 (2.95, 1.94, 1.34, 1.00, .65) and simulated engine power curve, The 1st to 2nd shift only resulted in a loss of 170 ft/lbs @ 7000 rpm.

extending the power to 12000 rpm showed a gain if I shifted at 8000 rpm in later shifts! (like a hydraulic roller motor could rev that high! and produce). Helpful none the less

88workcar · 12-30-2000, 10:14 PM

I wish we had a chart for speedo gears. I have 4.30s and a tremac and 28 tires. And the wrong speedo gear.

------------------
Jason B Johnson 88LX,speed density,edel heads,4.30s,B-303,cobra,tremac,
12.38 @ 111.28 1.80 60ft 28X10 street tires
12.17 @ 112 26 X 10 slicks

Jeff Chambers · 12-31-2000, 09:44 AM

I've got a javascript calculator on my site that lets you put in the tire size to figure the correct gear. It also gives the error you'll see in your speedometer.

Just follow my sig and go to the Tech Articles section.

------------------
Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
http://www.kellnet.com/chambers

01-01-2001, 08:09 PM

Does anyone know how to find out it the AOD in my car has 7 or 8 teeth on the drive gear? The website mentioned above is great, Thanks alot.

------------------
86 GT T-tops, AOD, B&M shift kit and hammer shifter, ROH wheels, K&N, Timing, 87 spindles, rear disc, BBK 1.5, poly bushings, Crutchfield front kick panel speakers.

12-29-2000, 08:54 PM	#1
Enrique Rodriguez Guest Posts: n/a	RPM calculator for gear changes Hey, Randy's Ring and Pinion has a great calculator to find what RPM you'll be spinning with size "X" tires and gear "X". It even figures out the tire height and tells you the RPM for manual or auto. the site is www.ring-pinion.com.

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12-30-2000, 03:49 PM	#2
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	we have the same thing here, called the analyzer, i went and check that link out and it is good for finding tire sizes the analyzer we have here give more info such as: for each gear, rpm's for each 10 mph and also mph for each 100 rpm's very helpfull for figuring cruise speed and also can help with shift point if u know your hp curve. [This message has been edited by lx mike (edited 12-30-2000).]

12-30-2000, 09:57 PM	#3
MiracleMax Registered Member Join Date: Apr 1999 Location: Hayes, Va, USA Posts: 798	Hah, depress yourself with the optimum shift point calculator at http://www.prestage.com/ Inputing the ratios for a T-5 (2.95, 1.94, 1.34, 1.00, .65) and simulated engine power curve, The 1st to 2nd shift only resulted in a loss of 170 ft/lbs @ 7000 rpm. extending the power to 12000 rpm showed a gain if I shifted at 8000 rpm in later shifts! (like a hydraulic roller motor could rev that high! and produce). Helpful none the less

12-30-2000, 10:14 PM	#4
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	I wish we had a chart for speedo gears. I have 4.30s and a tremac and 28 tires. And the wrong speedo gear. ------------------ Jason B Johnson 88LX,speed density,edel heads,4.30s,B-303,cobra,tremac, 12.38 @ 111.28 1.80 60ft 28X10 street tires 12.17 @ 112 26 X 10 slicks

12-31-2000, 09:44 AM	#5
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	I've got a javascript calculator on my site that lets you put in the tire size to figure the correct gear. It also gives the error you'll see in your speedometer. Just follow my sig and go to the Tech Articles section. ------------------ Jeff Chambers Trophy Stock #3 11.97 Seconds / 114.5 MPH http://www.kellnet.com/chambers

01-01-2001, 08:09 PM	#6
Enrique Rodriguez Guest Posts: n/a	Does anyone know how to find out it the AOD in my car has 7 or 8 teeth on the drive gear? The website mentioned above is great, Thanks alot. ------------------ 86 GT T-tops, AOD, B&M shift kit and hammer shifter, ROH wheels, K&N, Timing, 87 spindles, rear disc, BBK 1.5, poly bushings, Crutchfield front kick panel speakers.