Gearing Question........

[VIPER BAZ UK]

Ordered the new 5th 6th gears....

.80 / .63 Can some one tell me or have a link to a chart that would now tell me my new RPMs at 80mph ect ect from my oe 5th and 6th..
Many thanks

 

[PhoenixGTS]

Found a good one with google. Here is a link:

Second Strike Gearing Calculator

[EDIT] dang just noticed you cannot insert your own ratios on that one. I can't find the one I used to determined that with GenII-height rear tires, 3.55 rear gears and the .64:1 6th my car would theoretically be going right at 200 mph @ 6,200 in 6th. Search through old posts and you will find one.

 

[VIPER BAZ UK]

Bump............

 

[PhoenixGTS]

Try playing with this version of the Unitrax gear calculation function from their site:

Unitrax - For driveline and differential parts and services. Using parts from the most reliable companies in the industryana Spicer, American Axle, Timken, Gear Vendors, Torsen, Federal Mogul and Lucas Oils

 

[FE 065]

rpm x td
---------- = MPH
gr x 336

td = tire diameter
gr = overall gear ratio (axle gear x trans ratio)
336 = constant

and variations for gr, td, rpm

 

[Jack B]

Try playing with this version of the Unitrax gear calculation function from their site:

Unitrax - For driveline and differential parts and services. Using parts from the most reliable companies in the industryana Spicer, American Axle, Timken, Gear Vendors, Torsen, Federal Mogul and Lucas Oils

I could never get the Unitrax calculator to hit reality, there has been that discussion before.

An additional heads-up, the oem tire is 26", but, if you are using a 26" bias ply slick it will grow at least 1" at the end of the quarter.

 

[VIPER BAZ UK]

Got the OE specs..

But cant find a chart/conversion table to work out with .80 / .63 5th and 6th

GearRatioOverall Ratio(Rpm)Mph1st2.66:18.17:1(6000) 562nd1.78:15.46:1(6000) 833rd1.30:13.99:1(6000) 1144th1.00:13.07:1(6000) 1485th0.74:12.27:1est (4950) 1656th0.50:11.54:1est(3360) 165

 

[VIPER BAZ UK]

Found one....

Fatboy Raceworks » Graphical Transmission Gear Ratio Calculator