Can someone please explain converter lokup and unlock? Which is better for performance? How do you determine the RPM, MPH points for lock and unlock? What is the theory behind it?
converter lockup?
- Thread starter lightngsvt
- Start date
MO Lightning
Savin' for an HD F150
Talk to "Icepick" on this board. He locks his convertor at a certain point on the track with good results. I know others that bypass the lockup and leave it unlocked for the whole pass. I just leave it out of OD and put it to the wood. I have yet to hook up the convertor switch on mine. "dpracing" has the info on the wiring for the switch. I have it at home, somewhere...
OK thanks, Ill shoot Dave an e-mail. But could someone explain the concept and what actually occurs during locking and unlocking? I assume that it somehow mechanically locks the tranny to the engine, as opposed to just a fluid coupling?
MO Lightning
Savin' for an HD F150
Yeah, the lockup just applies a clutch inside the convertor to lock it 1:1 instead of the fluid coupling/slippage from the turbines and such.
HotRod
Motivational Speaker
From my experience, in a near stock Gen1, I went slower with the convertor unlocked the whole 1/4. My ET was slower and my MPH went down. Its simply not as efficient with the lockup off. Too much slippage. It was a nice experiment but not a successful performance upgrade.
Hotrod, you have a tuner, right? What are your settings?
John, so you basically arent locking up until 83mph in 3rd? I dont think any of our trucks is seeing 80 mph in 2nd gear! Right? So some run better with no lock and some run better with "alot" of lock? Great...... Another variable to play with.... :m 
GJLS, If I tune by your method (judging by how fast you run, you must know what are talking about) that would have me setting my lockup at 68 in second and 108 in 3rd to be 1000 rpm over my torque peak at 4200 RPM. Heck I have only been running 95-97 in the 1/4 mile.....
GJLS, If I tune by your method (judging by how fast you run, you must know what are talking about) that would have me setting my lockup at 68 in second and 108 in 3rd to be 1000 rpm over my torque peak at 4200 RPM. Heck I have only been running 95-97 in the 1/4 mile.....
Last edited:
lightngsvt said:John, so you basically arent locking up until 83mph in 3rd? I dont think any of our trucks is seeing 80 mph in 2nd gear! Right? So some run better with no lock and some run better with "alot" of lock? Great...... Another variable to play with.... :m
GJLS, If I tune by your method (judging by how fast you run, you must know what are talking about) that would have me setting my lockup at 68 in second and 108 in 3rd to be 1000 rpm over my torque peak at 4200 RPM. Heck I have only been running 95-97 in the 1/4 mile.....
Chuck your going 108 at 4200 in drive ???
I lock mine at 65 in 2nd and 99 in drive and I'm shifting at 5900
Jerry
svtpickemup
Active member
Mike Arnett at Silverstate Motorsports (yeah, the Turbo guy) knows quite a bit about lockup. He is an Autologic dealer. If I remember correctly he has his truck set to lock and unlock in almost every gear during his 1/4 mile pass. He says it is like having a seven speed automatic. I guess it keeps him closer to peak his peak torque.
Of course, you do things like that when you have a dyno and the Autologic software...........
Of course, you do things like that when you have a dyno and the Autologic software...........
GJLS said:
No.... What I meant was since my tq peak is at 4200, to set it 1000 rpm above that would equal 68 in 2nd and 108 in 3rd. But I think im a moron, because I was close to needing to shift into 4th at the top end and that was only 97 mph. What did I figure wrong???
It's really going to vary from truck to truck(power adder, N/A, cams, etc. etc.) it's a trade off between not transfering all the power (unlocked) and keeping the engine in it's operating range.
That's one area where the EEC-Tuner shines, take your laptop to the track and dial that bad boy in
That's one area where the EEC-Tuner shines, take your laptop to the track and dial that bad boy in
lightngsvt said:
No.... What I meant was since my tq peak is at 4200, to set it 1000 rpm above that would equal 68 in 2nd and 108 in 3rd. But I think im a moron, because I was close to needing to shift into 4th at the top end and that was only 97 mph. What did I figure wrong???
Chuck the best thing to so is like Raymond said it's all in what works best with your setup.
Jerry
