High stall, how does it work?

[Franco Cozzo]

Hey guys, I'm curious to a high stall, in an automatic car, how does it work? Does that mean the car won't move until it hits 3000 RPM for example? I've barely ever driven an automatic car.

Thanks much.

[pks54]

Every car (automatic) has a stall converter otherwise the car will stall when not moving. The stall converter will "slip" untill the stall speed is reached where it theoretically will mean no slipping occures. Thus a higher stall converter will make the car rev faster to its stall speed which will mean you are in the sweet spot zone for more horse power and torque. Usually a higher stall will go hand in hand with lower diff gear ratios as you will see modders put on. As you could imagine with a higher stall and normal cruising diff ratios you will be constantly driving (when cruising) in the "slipping" zone of the stall converter.
Hope thank makes sense.

[Windsor220]

Originally Posted by pks54

Every car (automatic) has a stall converter otherwise the car will stall when not moving. The stall converter will "slip" untill the stall speed is reached where it theoretically will mean no slipping occures. Thus a higher stall converter will make the car rev faster to its stall speed which will mean you are in the sweet spot zone for more horse power and torque. Usually a higher stall will go hand in hand with lower diff gear ratios as you will see modders put on. As you could imagine with a higher stall and normal cruising diff ratios you will be constantly driving (when cruising) in the "slipping" zone of the stall converter.
Hope thank makes sense.

It will lock up when cruising though if you have a converter with a lock up clutch in it.

[mik]

http://www.youtube.com/watch?v=MvLoX0z9qoY
http://www.youtube.com/watch?v=PKUbo4gzPAU

[JACK250]

Originally Posted by pks54

Every car (automatic) has a stall converter otherwise the car will stall when not moving. The stall converter will "slip" untill the stall speed is reached where it theoretically will mean no slipping occures. Thus a higher stall converter will make the car rev faster to its stall speed which will mean you are in the sweet spot zone for more horse power and torque. Usually a higher stall will go hand in hand with lower diff gear ratios as you will see modders put on. As you could imagine with a higher stall and normal cruising diff ratios you will be constantly driving (when cruising) in the "slipping" zone of the stall converter.
Hope thank makes sense.

As far as I understand it still pulls under the rated speed when driving, it just won't pull hard enough to make the car burnout under stall speed if the brake is applied?

[Matt47569]

there's a stall speed and a flash speed.. a 3000rpm stally will have a 3000rpm flash speed, which is where the revs will shoot straight too when the foot goes down

stall speed will be somewhere like 2600rpm which is where you can put your foot on the brake and build revs to that point before the tyres begin to spin. believe it varys with how much torque the car has etc

[scoupedy]

They use a turbine in a fluid filled disc the outside of the converter is attached to the flywheel and the inside turbine to the transmission as the converter spins the oil grabbs at the turbine and spins it thus removing the shock of gear changes and getting up to the stall speed. The higher the stall the finer the pitch is on the turbine and hence has to spin faster before it gets enough grip this is how i understand it