Stall speed vs temps vs fluid

[TT/Ameasap]

I did a quick search and had little results to these in correlation.

I picked a stall speed of 3200-3400 9.5" L/U converter for my combo. I may be running a bit higher temps in the motor and was wanting to know how much (educated guess welcome ) the temps are effected by fluid and stall speed.

another question was about the size of the converter(9.5")... What does that effect besides rotating mass?

Thanks

Bo

 

[Dusty Bradford]

I did a quick search and had little results to these in correlation.

I picked a stall speed of 3200-3400 9.5" L/U converter for my combo. I may be running a bit higher temps in the motor and was wanting to know how much (educated guess welcome ) the temps are effected by fluid and stall speed.

another question was about the size of the converter(9.5")... What does that effect besides rotating mass?

Thanks

Bo

Thickness of the fluid does effect stall speed. Thicker/cooloer fluid will tighten the converter stall. 200 rpm is common from regular ATF to a thicker tractor fluid like Hy-Trans Ultra from CaseIH. If you sit on the transbrake for an extra 2-3 seconds like has happened in races you could see the rpm drop on the gear change drop 400 rpm less. One car I drive will do a wheelstand with cold fluid and hang the tires about 2 feet in the air with only a 45 minute cool down. The hot fluid keeps the nose down because it's slipping more.

The larger the converter, the tighter it can be....An 8" may work well in a high rpm set-up or a light car but a turbo car or low rpm big block will blow right through it. A small converter can couple as well as a larger one but it takes rpm to get it there. I have 8 second N/A big blocks running 8" converters but they shift at 9500 Put some n20 on it and shift it at 7500 and it needs a 9.5 or 10". There are also numerous cores, pumps, pump fin angle, stators, stator blade count and fin angle....It's not just the size of the converter but the parts design on the inside that effect stall and how well a certain size converter will work. Just recently, I had a big block customer with a 9" that wasn't quite efficient enough in high gear. It was as tight as I could go so we made the move to a 9.5.

 

[TT/Ameasap]

Thanks for explaining that!