Torque converter slippage

[Mike Rietow]

Originally Posted by Makinchips

What percentage does an 8" a/sa or b/sa converter slip approx.

I'm considering upping the rear gear in my bracket car which runs low 10s presently but am unsure of the rpm gain from converter slip.

There is an equation. Need this info.

Tire size + observed roll out? + bias or radial?

Current gear

New gear

The current rpm and mph at the stripe.

It'll tell exactly what rpm you'll cross with the new gear , as well, as converter slip percentage with the current and new gear.