14T double, 2.25 Stealth gearing suggestion

[ca-rj]

As the title states, I am looking for a starting point for a 14T double. I'm running an 81T spur and the car will be run a very tight track with one long straight.

Thanks.

[bully]

With 81 tooth spur start with 13 or 14 tooth pinion and run for 3 minutes and check temps,if around 55 -60 degrees Celsius go smaller if under 50 degrees Celsius let cool and run full five minutes and check final temps again..