Torque convertor stall speed Q

[Anonymous]

I see lots of different stall speeds that get used and know the higher it is it's more for race that street use, but what's the stall speed of a standard convertor on a car to start with ????

[Blue]

It varies but will be around 1500 to 1800 rpm.

[Anonymous]

Cheers Blue

.

[Gringo]

The standard convertor on my car was about 1800 rpm stall, but my new cam doesn't 'come on' until about 2400rpm. That would mean, when I floor it from standstill, I'd have to wait for the road speed to catch up with the cam before it really got up and went. I've gone for a 2800 rpm stall convertor, which means as soon as I floor it, it should be on the cam and flying. That's the idea anyways...

[MilesnMiles]

Advertised stall isnt always accurate either. My stall is advertised at 2800 but is closer to 2200.
However, choosing correct stall to go with gears and cam makes a lt of difference. whilst i'm waiting for my 3.55 diff rebuild, the motor is grumbling a bit when in low revs with 3.23 rear.

[Dave-R]

The speed any given converter "stalls" at is determined by the torque curve of the engine.

The more torque the higher any given converter will stall.

So a converter that stalls at 1800rpm in a 318 might stall at 2800rpm in a 440.

Fitting bigger (longer duration) camshafts in an engine moves the torque curve higher up the rpm scale. This is how you make more HP.
But that usually means that with a longer duration cam you actually make less torque at lower rpms.
So any given torque converter in this hot engine is going to now stall at too low a speed. In fact it will pull the rpms down at idle.

So in engines with big cams you actually need a higher rated stall speed just to idle and drive in traffic correctly without the engine stalling.