torque converter lock and unlock switch - Ford Powerstroke Diesel Forum
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Old 07-08-2011, 01:21 PM
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torque converter lock and unlock switch

hey guys

Been thinking about trying to make a converter unlock switch for sled pulling only. What do you guys think. I think it would be easier on the 5r110 and shifting to second toward the end of the track. Could i please get some pros and cons if any. Thanks Brad
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Old 07-08-2011, 01:26 PM
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You want to unlock your TC. Do they actually lock up during a sled pull run?
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Old 07-08-2011, 02:01 PM
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I would think you want it unlocked for the shift and right after the shift to keep RPMs up there after hitting 2nd, and I do not know if it is mechanically possible for the converter to lock in first.
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Old 07-08-2011, 02:20 PM
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im wanting the converter locked in 3rd going down the track than im wanting it unlocked when i get to the end. In my sled pull video you can hear my truck power out in the end because its locked in 3rd
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Old 07-10-2011, 12:30 PM
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What do you guys think about down shifting to 2nd at the end. How would that go over with the 5r110?
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Old 07-10-2011, 02:46 PM
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the pcm controls of operation of the clutch through the tcc solenoid. grounding the solenoid engages the clutch

so you'd need a 3 way switch, one position for stock operation, one to engage and one to disengage

the solenoid is duty cycled by the PCM and to be honest I'm not sure how this would affect that. obviously with an on/off switch you'd have instant full engagement, can't say if that could be detrimental to the clutch

oh yeah, and you'd surely set a dtc
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Old 07-10-2011, 06:12 PM
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How about down shifting to 2nd?
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Old 07-11-2011, 04:14 AM
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Old 08-10-2012, 10:24 AM
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Quote:
Originally Posted by 01redcrew View Post
hey guys

Been thinking about trying to make a converter unlock switch for sled pulling only. What do you guys think. I think it would be easier on the 5r110 and shifting to second toward the end of the track. Could i please get some pros and cons if any. Thanks Brad
I know it's a year late, but did you ever get a switch setup? I just finished mine last night and it works great, although I have the switch to lock the convertor during a pull. TCC's typically don't lock during a pull and a transmission can still shift with the TCC locked. I pulled once last year, starting in 2nd and ending in 3rd and didn't get much wheel speed from that! So I am using my switch to gain the extra wheel speed in 2nd, so that I can start and stay in 2nd the whole length of the track and end up with more wheel speed than I would have if in 3rd with an unlocked TCC. This way the tranny doesn't have to shift, the TCC is not burning the tranny fluid, and I have addition wheel speed and RPM. Took it out last night and can get to 18-20 mph in 2nd/lo, which is good enough for me; would like 25, but 3rd would be too much for the power I am making. Also, found out last night that you would really only want to use the switch for sled pulling. In 4 low, with TC locked, and no load it is very difficult to be steady. The truck starts to buck very quickly (like someone new learning how to drive a stick) and I can see how you could break something very easily! If you still need info on the wiring and such let me know and I'll get the wiring schematic and pics up. You will get a trouble code, although the way it's wired the tranny will not go into limp mode or anything.

Last edited by c85r86; 08-10-2012 at 11:09 AM.
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Old 08-11-2012, 01:51 PM
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nope i never got around to doing it. I still want to do it in the future. I think depending on tuning your running isnt the converter locked in 3rd gear?
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