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Old 02-04-2008, 04:15 PM

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Detecting stall speed?

Is there anyway to find what the stall speed of a converter is without removing it? thanks

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Old 02-04-2008, 04:24 PM
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You can hold your foot on the brake in rev it up till it start's to pull,This will give you a idea were it's at.If you have a tach.
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Old 02-09-2008, 01:48 AM
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Set up a data acquisition system to log RPM and look at the slope of the graph

Look at the blue line. This one stalled at about 4000rpm after staging at about 3000rpm.
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Old 02-11-2008, 04:32 AM
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You need a tach and a safe stretch of open road to make a simple driving test.

With most street tires the tires will spin before you reach the torque converters maximum stall by either stationary "power braking" the car or launching at full throttle.

With racing slicks that "hook up" well, you can just watch the tach as you launch the car at full throttle from a stop.

The best way to get a good idea of the actual stall speed in the car using street tires is to slowly/smoothly accelerate in first gear using minimal throttle. Shift to drive and let the trans shift to a higher gear (3rd is best).
When the transmission shifts to the higher gear, floor the throttle and jamb on the brakes hard with both feet and watch the tach. It (the tach) will flash to your converter stall speed briefly before the transmission either down shifts and or the tires spin.

On a 350ci motor a stock GM th 350 12" converter will stall at 2100-2200 rpm
A typical 11" diameter "high stall" converter will stall at 2800 to 3000rpm.
A typical 10" diameter "street/strip" converter will stall around 3200 to 3600 rpm.
A smaller ci motor will show a lower stall speed (less engine torque). A larger ci motor will show a higher stall. Usually a 454 BB will show about 500rpm higher stall than a 350 with the same converter.
"Race" 8" and 9" converters can vary a lot in the actual stall depending on their specific internal construction.

Last edited by F-BIRD'88; 02-11-2008 at 04:44 AM.
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