OBS convertor lockup
1 - 17 of 17 Posts
Joined
·
15,472 Posts
The tune, and the V.B. the way it is set up I beleive.
Joined
·
150 Posts
size of the dump hole in the pump controls firmness.
Joined
·
10,051 Posts
Jon thank for the reply. So is the firmness variable with engine power output rpm or something along those lines or does it hit the same way every time and has to be fairly stiff to prevent slipping at higher engine power output?
Tom
Tom
no the e4od's are not pwm. No matter what (e4od's), the tc will unlock on the shifts unless a tc lockup switch is used. Jon did something to my built trans where it wont flare on the shifts at all even without using the tc lockup switch, maybe he'll chime in and enlighten us. Infact several times while racing i forgot to use my tc lockup switch and it made very little difference in my times.
My ford reman (in my 97) flares on the shifts even with Jons valve body, if the trans ever has to come out i'll let him do his magic to that one aswell.
Joined
·
150 Posts
What issues are you having Tom?
Joined
·
10,051 Posts
No major issues really Jon other then the convertor locks up a little harder then I would like at light throttle esp in lower chip settings. The regular shifts were that way as well but I had those tuned out for the light acceleration stuff. It is not enought to warrant pulling the transmission by any means but it is enough that I wanted to learn some more and get some knowledgeable input. I have noticed this in other transmission as well and maybe it is partially the characteristic of the beast. I am also guessing that I am more particular about it then most as I know at lot of guys like snappy shifting stuff esp barking tires at WOT
Tom
Tom
ya think???? except how to break em!!!! lol...
Joined
·
824 Posts
Rusty Like your one to talk you broke some parts as I remenber.
Tom,
The E4od uses the on/off lockup. When it's off, oil fills that space allowing a cushioning effect on apply. Limiting the cushion effect in an E4od results in a harder lockup if that makes sense.
If the pump was drilled Tom, the cushioning effect is reduced. It's commonly described as what it does "firmer Converter clutch apply". Many believe that must mean a pressure increase. 
In your truck, the apply feel is determined by more than 1 factor.
Another factor is multi discs and clearances. More discs in less space = a firmer apply. A shift kit all by itself sort of. You have 4 factors I know of affecting TCC. The unknown is when it applies since you have TDE-1 programming or a chip could be overriding. The PCM either commands Tcc On or off in your truck. The 4R100 in Diesels have the pulse modulated apply, designed to be softer by adjusting pulses. No pulse adjustment in your truck. The benefit in my op. is you need not worry about programmng applying your TCC without enough pulses. If you can picture a brake pad against a rotor wearing away, that would be my concern of the wrong pulse apply on the TCC from programming in a 4R100 behind a diesel. I'd consider your lockup a plus unless it's spilling your coffee. Then the cover and piston need to be up to the task as well. 1 of the factors inside would than need a change, meaning pulling the unit.
In your truck, the apply feel is determined by more than 1 factor.Another factor is multi discs and clearances. More discs in less space = a firmer apply. A shift kit all by itself sort of
. You have 4 factors I know of affecting TCC. The unknown is when it applies since you have TDE-1 programming or a chip could be overriding. The PCM either commands Tcc On or off in your truck. The 4R100 in Diesels have the pulse modulated apply, designed to be softer by adjusting pulses. No pulse adjustment in your truck. The benefit in my op. is you need not worry about programmng applying your TCC without enough pulses. If you can picture a brake pad against a rotor wearing away, that would be my concern of the wrong pulse apply on the TCC from programming in a 4R100 behind a diesel. I'd consider your lockup a plus unless it's spilling your coffee. Then the cover and piston need to be up to the task as well. 1 of the factors inside would than need a change, meaning pulling the unit.1 - 17 of 17 Posts
