Torque Converter Slip
10-28-2003, 08:40 PM
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Car: 1992 RS Camaro bracket car
Engine: 350
Transmission: TH-350
Torque Converter Slip
I know it exists.... Does anyone have a percentage or rule of thumb for calculating Torque Converter Slippage?
i am trying to figure what tire size will work best. Does amount of slip vary much with engine power or it is a fixed rate?
Any comment would be appreciated.
i am trying to figure what tire size will work best. Does amount of slip vary much with engine power or it is a fixed rate?
Any comment would be appreciated.
10-28-2003, 09:18 PM
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
8-10% is typical.
A 10" 3800 stall converter is loose and will have a high slip percentage. A 8" 3800 stall converter is very tight.
To calculate just how much slippage is in the converter you need to know a few things.
Tire diameter
Finish line rpm
Finish line mph
Rear gear ratio
From that, converter slip can be calculated.
My converter is an 8" that stalls at 5700 rpm. My tire size grows to an estimated 30" tall (29" tire). I cross the finish line at 7000 rpm and 128.47 mph with 4.56 gears. That gives me 8.87% converter slip. Guessing at a 29.5" tall tire with less tire growth drops the slip percentage down to 7.32%
So even though a small loose converter is designed to slip a lot at low rpms, mine works just fine since my engine operates mostly above the stall point.
A 10" 3800 stall converter is loose and will have a high slip percentage. A 8" 3800 stall converter is very tight.
To calculate just how much slippage is in the converter you need to know a few things.
Tire diameter
Finish line rpm
Finish line mph
Rear gear ratio
From that, converter slip can be calculated.
My converter is an 8" that stalls at 5700 rpm. My tire size grows to an estimated 30" tall (29" tire). I cross the finish line at 7000 rpm and 128.47 mph with 4.56 gears. That gives me 8.87% converter slip. Guessing at a 29.5" tall tire with less tire growth drops the slip percentage down to 7.32%
So even though a small loose converter is designed to slip a lot at low rpms, mine works just fine since my engine operates mostly above the stall point.
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