McCool98

I understand a higher stall TC increase your off the line performance, but i'm confused as to what the TC actually does in the drive train. Can someone explain it to me? I'm a mechanical engineer so you don't have to put it in lamen terms. lol

-Jason

BlackHawk T/A

iTrader: (3)

Read this:

http://auto.howstuffworks.com/torque-converter.htm

McCool98

What i've gleaned from that doc is that when you increase the "stall" of a TC you are changing the rpms at which th clutch locks up. With a higher stall you can effectively increase the amount of time between which you step on the gas and the clutch locks up - multiplying the torque. So you get more torque up until the clutch locks, correct? If you have a 3000 stall TC you get more torque through those RPMS, and once the clutch locks up you lose that torque multiplier?

BlackHawk T/A

iTrader: (3)

No, the stall speed is affected by how the torque converter is made (angle of the fins and such)

The clutch just locks the unit so you stop slipping (much like a manual transmission). This isn't done until higher speeds.

McCool98

So what exactly does the "stall speed" do for the torque converter?

BlackHawk T/A

iTrader: (3)

There is Flash Stall, which is the RPM your converter will jump to when the car goes WOT from idle. At this RPM it will send the power down the line, so to speak.

Brake stall is how high it will spin to before trying to move the car, while the brakes are applied.

The stall ratings you see are flash stall.