How to tell how much gear you need

46callaway

46callaway

Registered
Elapsed Time X MPH = 1335
Examples:
13.35 x 100.00 MPH = 1335
12.00 X 111.25 MPH = 1335
If the factor is more than 1335, add more rear gear.
If the factor is less than 1335, reduce rear gear
 
I'm not sure I found this on another site but it seems to work. For your best ET/MPH I get 1404, you need a little more gear to be ideal (4.56). Makes sense but I have no idea how it works.
 
You're right, for best track performance, I do need a 4.56 rear gear. I figured this out via dyno charts, lots of track slips and calculations I made while I ran with the 4.10s.

I guess what I'm wondering is what variables condense to factor the number 1335 from the trap speed and ET. I would presume several variables, not the least of which would be HP and weight.
 
Seems right, but I don't have time to figure out...

I would say that the et is a torque rating (torque meaures time to cover a distance) and the MPH would equate to a HP rating as HP is a measurement of speed achieved over time.

Very cool though.

Mike
 
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