Gear Vendors overdrive

Revhendo said

This is what I mean about getting answers that don't directly address my question.
Plus I love being taken out of context......

So, simplifying......
You drive at 70mph and your engine is running at 3000 rpm. Your converter stall (the theoretical point where pump and turbine speed are the same?) is 2500 rpm. Things are happy, right?

You add an overdrive that drops your rpm below the 2500 rpm, then isn't your converter "slipping" which in turn creates HEAT?

Isn't this why modern AODs have lock up converters?

Click to expand...

yes and no -

Case in point - ME!

I have a 400 hp 360 3.23 gears and a 3800 stall dynamic 9.5" converter
I used to have a mopar 175k converter with the same setup and burned it up with the tranny - Why? It was slipping.

The 9.5" dynamic converter lowered my cruising RPM , raised my mileage and lowered my ET at the track.
It was more efficient and designed to handle the slip different then the old school mopar unit

The pitch of the fins, the stator angle and the case size determines flash stall.

I wrote a 2 part article on it a few years ago and went to dynamic converters and watched them assemble one and saw all the differences they had to choose from - neat **** right there!

Anyway - the car cruises 3200 @ 75 - so anything under that should be slipping and heating up but the pitch of the blades combined with the smaller case ( 9.5" diameter compared to the 11" stocker ) made the converter slip only when it was overpowered with torque ( when you nail it ) otherwise it acts like a stocker.