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torque convertor slippage percent #2598028 12/28/18 04:07 PM 12/28/18 04:07 PM
Joined: Jun 2016 Posts: 911 Washington H hemienvy OP super stock
hemienvy OP super stock H Joined: Jun 2016 Posts: 911 Washington	360 / 727 in a 1/2-ton pickup, 3.23 gears, 275-60-15 tires. Using the old formula: MPH = RPM x tire diameter / 336.13 x total gear ratio I calculate about 16% convertor slippage at 50 MPH, level driving no load. At 50 MPH I'm at 2250 RPM. Does this seem high for a stock convertor ?

Re: torque convertor slippage percent [Re: hemienvy] #2598030 12/28/18 04:12 PM 12/28/18 04:12 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Sounds high. I would expect to see more like 5-7%. Try this speed/rpm calc to double check your math: https://www.e-bodies.org/resources/rpm-speed-gear-tire-size-calculator/

Re: torque convertor slippage percent [Re: hemienvy] #2598045 12/28/18 04:37 PM 12/28/18 04:37 PM
Joined: May 2005 Posts: 4,761 Florida BDW master
BDW master Joined: May 2005 Posts: 4,761 Florida	I agree, 7% is about right

Re: torque convertor slippage percent [Re: hemienvy] #2598052 12/28/18 04:55 PM 12/28/18 04:55 PM
Joined: Jan 2003 Posts: 26,017 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 26,017 Rio Linda, CA	Originally Posted By hemienvy I calculate about 16% convertor slippage at 50 MPH, level driving no load. At 50 MPH I'm at 2250 RPM. Be sure your speedo is accurate (check with GPS or roadside markers) and the tire diameter you used in your calculations is correct (check the rollout). The INTERNET, the MISinformation superhighway

Re: torque convertor slippage percent [Re: hemienvy] #2598128 12/28/18 08:34 PM 12/28/18 08:34 PM
Joined: Jan 2003 Posts: 3,575 The Netherlands BigBlockMopar master
BigBlockMopar master Joined: Jan 2003 Posts: 3,575 The Netherlands	IMO the slipage gets relatively more at slower rpms as the convertor become less efficient/capable of transferring the torque. Switching the convertor Lockup ON from OFF on a A518 transmission resulted in some 200-300rpm drop usually while cruising at around 1500-2000rpm on my setup. That's more than 10%. BigBlockMopar.com

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