Torque Converter lock up question
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Staging Lane
Joined: Apr 2015
Posts: 63
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From: Kansas
Torque Converter lock up question Just did a 4L80e swap with an edge 3700 stall and my tuner was asking me what gears i wanted the converter to lock up at WOT and i really didnt know the right answer. Its a N/A car no power adders. Just wanting your guy's opinion, on what gears the torque converter should be locked up in
Moderator
Joined: Aug 2010
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From: Ann Arbor, MI
Unless the converter is a triple disk ($1000+) I would strongly advise against ever locking at at WOT or you will quickly wear out the lockup clutch and clog up the trans with friction material.
I do have a 3600 stall triple disk and I tune it to lock up at 4200 RPM in 2nd and immediately in 3rd after the shift. Don't know if the 4200 in 2nd is the ideal RPM but it seems enough to give me enough shift extension after the 1-2 shift.
Due to gearing a slippage, you have to determine/calculate/estimate what MPH the desired RPM corresponds to since the lockup is tuned by MPH. Since I log most runs with my scanner I can quickly determine what MPH corresponds to any RPM.
I do have a 3600 stall triple disk and I tune it to lock up at 4200 RPM in 2nd and immediately in 3rd after the shift. Don't know if the 4200 in 2nd is the ideal RPM but it seems enough to give me enough shift extension after the 1-2 shift.
Due to gearing a slippage, you have to determine/calculate/estimate what MPH the desired RPM corresponds to since the lockup is tuned by MPH. Since I log most runs with my scanner I can quickly determine what MPH corresponds to any RPM.
Teching In
Joined: Oct 2019
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problem with no lock up in 3rd is that you wont get real dyno numbers as convertor would not lockup. Dyno operators always need a 1:1 ratio to close to it which is 3rd gear.
TECH Junkie
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From: White Bear, Mn
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Here is a link to a shot vid of my caprice popping off. Thanks for the info and replies I really appreciate it.