? convertor flash/stall

[madcarson]

Help me understand how these relate,if I have a 2800 stall then what is flash ? Is it what you rev to prior to launch or ? I don't have a transbrake yet so using linelock and or footbrake
Thanks:smoke:

[Taylor1969]

sort of... problem is - a converter will flash different in different cars because of weight, HP, etc.

[Steve Chryssos]

Stall speed is a technical term. Flash stall is more of a benchracing term.

If you want the long winded definition check out this thread HERE (https://www.pro-touring.com/forum/showthread.php?t=50466&highlight=stall+speed)

The short scientific versions is as follows: Stall speed is the rpm at which 100% of the input torque is being absorbed by the fluid coupling device with the output side locked. But that means little or nothing to hot rodders, so the definition has been turned around to suit the application.

The short, hot rodder friendly version is as follows: A torque converter's rated stall speed is the rpm that the engine will slip up to when 100% of input torque is applied and the output side is locked.

A transbrake or other locking device is required to truly measure stall speed in a vehicle. With a foot brake or line lock, torque is still being sent out the back of the trans, thru the driveshaft and to the rear wheels, so measured stall speed rpm will appear somewhere south of rated stall speed. So if you buy a true 2800 stall converter. it might show 2500 rpm when measured with a foot brake or line lock.

Flash stall is nothing. You can essentially ignore it since it is tested in an environment that is full of variables. It's a measurement from a roll or with the car at rest but brakes not applied. Since there's less resistance under these circumstances, the stall rpm will appear higher.

All of this means a lot to drag racers who are staging up against a "tree". Stall speed for a pro-touring car needs to be looked at differently since less than 100% of input torque is being applied most of the time (on and off throttle)