Torque converter
June 25th, 2024, 06:58 PM
#2
CH3NO2 LEARN IT BURN IT
Join Date: Jul 2010
Location: Land of Taxes
Posts: 5,011
"Do all Stock turbo 400 converters have the same slippage?"
Answer is, no..You mean the same "stall" speed. Its determined/engineered/governed by engine & chassis applications. Mundane church goin Delta 88 vs LS5 Big Block Corvette vs 454 HD 1 ton pick up vs 455 RV chassis....all different stall speeds.
"Is there any that have very little slippage?"
You mean low or stock passenger car stall RPM speed. An average passenger car TH400 would have the lower stall speeds.
High performance built drive trains generally employ a high stall to take advantage of other modifications,,,induction, cams, heads, intakes, rear gears etc.
Do some you tubing on how a torque converter works. Visuals are worth 1000 words.
Answer is, no..You mean the same "stall" speed. Its determined/engineered/governed by engine & chassis applications. Mundane church goin Delta 88 vs LS5 Big Block Corvette vs 454 HD 1 ton pick up vs 455 RV chassis....all different stall speeds.
"Is there any that have very little slippage?"
You mean low or stock passenger car stall RPM speed. An average passenger car TH400 would have the lower stall speeds.
High performance built drive trains generally employ a high stall to take advantage of other modifications,,,induction, cams, heads, intakes, rear gears etc.
Do some you tubing on how a torque converter works. Visuals are worth 1000 words.
June 25th, 2024, 07:05 PM
#3
Registered User
Join Date: Jan 2010
Location: central Indiana
Posts: 5,402
Here we go again.
All non lock up converters have a little slippage. Having said that, if it’s a quality well built converter it won’t be noticeable at part throttle.
Converters are load sensitive. The more load, the higher the stall speed right up to its maximum. Put it another way, at maximum torque (say 500lbs ft) the converter has stall speed of 3500. At part throttle the engine has 200lbs-ft of torque, the stall speed will be considerably lower.
The D5 converter used in the Buick Grand National will go to around 2800rpm. There is no way GM would have allowed that if they thought it would result in drivability or customer complaints.
The best advice I can offer is getting a custom made converter from the company of your choice. Coan, Hughes, ATI, all make top shelf quality converters. Call them, have as much info about your particular project, they will build exactly what you need.
All non lock up converters have a little slippage. Having said that, if it’s a quality well built converter it won’t be noticeable at part throttle.
Converters are load sensitive. The more load, the higher the stall speed right up to its maximum. Put it another way, at maximum torque (say 500lbs ft) the converter has stall speed of 3500. At part throttle the engine has 200lbs-ft of torque, the stall speed will be considerably lower.
The D5 converter used in the Buick Grand National will go to around 2800rpm. There is no way GM would have allowed that if they thought it would result in drivability or customer complaints.
The best advice I can offer is getting a custom made converter from the company of your choice. Coan, Hughes, ATI, all make top shelf quality converters. Call them, have as much info about your particular project, they will build exactly what you need.
June 25th, 2024, 08:53 PM
#4
Registered User
Join Date: Feb 2013
Location: Phoenix, AZ
Posts: 14,701
While not a TH400, the Hughes Performance converter in my TH350 is rated 2500 RPM stall speed and has around 250-300 RPM slippage at cruising speeds. As Matt said, a quality converter can have a high stall speed with high torque input and “normal” low slippage at low input torque during cruising speed.
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