New Converter, Different Shift Points?

[Adger Smith]

You are trying to do something you want to do. Listen to your car. It is telling you it doesn't like what you want to do.

[S/ST 3040]

Originally Posted by Adger Smith

You are trying to do something you want to do. Listen to your car. It is telling you it doesn't like what you want to do.

I ran the tighter converter with the taller tire and the 60" to 330' was better, the 330' to 660' was better but, loses MPH in 1/8th mile and the 1/4.


Then, I swap to the 1.4" shorter tire and the 60' is better than ever but, shift recovery is worse than the same converter with the taller tire.


I'm not hearing what it's trying to tell me. I would think the shorter tire would recover on the shifts better than the tall tire. Unfortunately, my last race was all 1/8th mile so, I never ran it out the full 1/4 mile. Looking at the MPH at the 660' doesn't indicate it was going to find anything in the last 660' but, I could be wrong.


I called ATI about sending one of them back. They told me they would be guessing if, they tried to make either one of them better and suggested I just use the one the gives the best ET.


Thanks for the responses, so far.

[Adger Smith]

Quote: Then, I swap to the 1.4" shorter tire and the 60' is better than ever but, shift recovery is worse than the same converter with the taller tire.

Did it ever occur to you the taller tire had the car going faster at the shift point than the short tire. Think about the physics that comes in play when that happens. The difference in the load on the stator, maybe, Aye... No wonder it wont recover. BTY: there are subtle changes that can be done to a converter that has no effect on stall speed that helps with recovery and TQ multiplication. You could even drop the pump pressure and make the converter act entirely different. Why do you think that any serious Comp racer or serious SS racer has at least two or three converters that all stall within a few hundred RPM of each other?