Hey everyone, it’s been too long since I’ve posted anything at all. A mixture of life, racing, and work have slowed down the updates. Hopefully more to come in the near future.

I’ve had a spreadsheet for a long time that I pilfered and highly modified. It’s a full transmission calc with editable fields for Tire diameter, final drive and redline/shift point. It’s come in handy multiple times.

Mind you these are theoretical numbers based on math, real world figures may vary slightly dependent on actual redline, true rolling diameter of the tires and accuracy of your MPH devices. It’s a great tool.

It’s published on a public google sheet and you can download it if you’d like or edit the blue variables and see live changes to MPH. I’ve included columns for numerous different examples if you wanted to see the comparison between a 25″ and 25.7″ tire or compare the difference in MPH based on redline.

Enough chatter, here’s the link.
Impreza Gearing Spreadsheet

Any questions or comments don’t hesitate to fire them off our way.

-T3h_Clap