Feature request: Don't unlock TC if...

[Philip Lochner]

I'm not sure if this needs to be a feature request or if my config is just wrong or if I don't understand how to implement....

I was driving down mountain passes with my Jensen Interceptor recently (on a 3700km road trip ) and every time I get off the throttle completely, she unlocks TC, then one could feel the car surge forward as the braking effect of running against compression was reduced - something I did not want - which then caused me to have to apply brakes.

I would like to have it such that the TC remains locked (if it was locked) even with 0 throttle above a specified speed, at least for 2nd, 3rd and 4th gears.

[muythaibxr]

The behavior you're describing as to how it's currently working is more or less how every auto I've driven works, though I can see why you'd want it to stay locked up.

[Philip Lochner]

though I can see why you'd want it to stay locked up.

Its simply to retain the maximum effect of engine braking while going down a steep hill. Although not quite as severe its a bit like popping it into neutral when the TC unlocks, in that it starts gaining speed - exactly what you do NOT want, the very reason your foot is off the accelerator. Also, there is no NEED for it to unlock under these circumstances - at least not that I can see.

It would be no different to having a manual in gear with foot off the accelerator and engine providing maximum engine braking.

[muythaibxr]

Yeah, I am agreeing with you but just adding that most stock autos that I have driven also unlock the converter in the same situation.

[Philip Lochner]

most stock autos that I have driven also unlock the converter in the same situation

That might be but I fail to understand why....

Also, "stock autos" also do some fantastically inexplicable things. My '14 Ford Ranger eg refuses to shift into 3rd unless rpms > 2100 for any amount of throttle when it could very well have shifted at much lower revs at light throttle. Irritates the life out of me!!

I realise that TransControl FW is a very low priority and that requests like this(and no timing retard for downshift) are unlikely to get attention.

Still hoping though.

[Raymond_B]

My 2012 F-150 has a pretty cool "tow/haul" mode. I used this on a trip up the East coast and back towing a trailer loaded with car parts. When engaged you cannot tell anything until you begin to brake, it takes a moment and then the truck would come out of overdrive, hold the brakes longer and it would go down one more gear. The up-shifts were delayed as well. This provided great engine braking while going down several 4-5% grades.

[devojet]

I have my "lock up min tps" set to 0.0% and it stays locked up until I touch the brakes or drop below min speed. Im using lock up in 3rd and 4th. Im pretty sure Im using release version 1.0 so not sure if the behaviour has changed or not.

Cheers
Daniel.

[Philip Lochner]

I have my "lock up min tps" set to 0.0% and it stays locked up until I touch the brakes or drop below min speed. Im using lock up in 3rd and 4th. Im pretty sure Im using release version 1.0 so not sure if the behaviour has changed or not.

Cheers
Daniel.

Thanks!! I'll check my config.

[Philip Lochner]

I have my "lock up min tps" set to 0.0% and it stays locked up until I touch the brakes or drop below min speed. Im using lock up in 3rd and 4th. Im pretty sure Im using release version 1.0 so not sure if the behaviour has changed or not.

Cheers
Daniel.

Thanks!! I'll check my config.

I checked my config and "Lockup min TPS is already set to 0%". I lowered the RPM thresholds from 1400 t0 1100 but could you please post a screenshot of you config or attach your msq?

[devojet]

Here is my msq.