A few years back when I bought my racecar, it came with a spare gearbox.
Its been sitting in my basement since then, then the other day i ripped it apart to determine what the hell it is.

SA style shifter model
Gear teeth:
28/13
26/20
21/25
17/29
31/15

At first I was like "Cool, another racebox" based on the 28/13 gears which in my simple mind gives a ratio of 2.153:1 Pretty long even for a racebox. But somehow, based on the other gears, I think I've got something wrong, did I miss an extra conversion ratio or what ?

I would upload pictures, but my internets' broke and the work pc wont accept bluetooth transfer Either way, it looks like any other gearbox inside, nothing fancy.

Kim

 

www.nopistons.com to the rescue.

Transmission Ratios for the rotary enthusiast:

http://mrmazda.no-ip.com/tranchrt.txt