Gearbox V tyre size V Diff ratio's

[atomman]

I've been playing round with various Subaru diff ratios in my car , So I quickly knocked up a spreadsheet today so I could cross reference RPM with different combo's like tyre size , diff ratio, etc etc

Anyways I thought this might come in handy for some people when choosing a rear diff ratio for the tyre size you a run on your Z or as a reference.

I have tried to include some common tyre size's I have seen every one use , if there's any more let me know and I will add them.

Its a work in progress so will update it here when I've got some graphs etc .

 

[atomman]

here's another handy calculator for shift points and rev drop ,

http://westfield-world.com/gearboxshifts.html

and another for gear shift points , cool animation of speedo and rev counter to

https://www.blocklayer.com/rpm-gear.aspx

 

[atomman]

It wont let me edit the top post so here's an updated spreadsheet , I will continue to add Tyre, Diff and gearbox options