Torque converter slippage
 

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.

Re: Torque converter slippage
 

We get 4%-6% with an 8" ATI.

Re: Torque converter slippage
 

How about 10 inch? I need a stall of 5000 - 5600 for my Impala SS

Re: Torque converter slippage
 

How are you going to get that stall from a 10" converter with low hp?. gsa612

Re: Torque converter slippage
 

you would be hard pressed to get that from a 9"
8" is the area ,, tune the converter from there

Re: Torque converter slippage
 

ATI told me as much as 9% for a PG 8" 5800 rpm 1.76 first gear 3200 lb. 509 BBC 800 hp was not uncommon.

Re: Torque converter slippage
 

Thanks...my car is a 1995 Impala SS LT1.
Weight 4150 lbs, stock rods, limited to about 7000 rpm.
Trying to understand the latest generation of converters.

Determining best gear to chose for top end.
5% slippage more gear, 8% slippage less gear.

D

Re: Torque converter slippage
 

Dan
The more gear that you have in the car the less the converter will slip. Talk to ATI about your combo and they will get you in the ballpark on the first try. Then you can make some changes as you move forward and test the car. Talk to Charlie at ATI. He is real familiar with the class racing stuff. You really can’t go wrong with them.

Re: Torque converter slippage
 

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.