Torque Convertor lock up instal

[Davis Dieso]

does this also work on the v6 and have the same benifits. if so where is it a benifit and are there any drawbacks for use by the average jo daily driver?
sorry but just trying to understand the concept of this still

This would work with the V6 Barcode, similar result but different. The petrol produces its torque higher in the rev's than the diesel (low RPM torque). For just day to day commuting/around town etc, probably not worth the hassle as the petrol needs to rev anyway, in saying that, if you wanted to be on the button (lock up) all the time some small benefit could result. If you were hauling a tradie trailer around most of the time or towing a caravan, then far more benefit could be had. It just allows the engine to push the car along like a manual instead of it revving higher (than need be). Toyota seem to like there engines revving high instead of being able to stick your foot into it without it kicking back. In the good 'ol days of auto's, you had to plant your foot to the floor to kick them back. The prado changes back to 3rd and unlocks the convertor at the same time, giving the effect of changing back two gears. With the lock up switch, it only kicks back to 3rd and powers on (same as 2nd).
Hope this helps. Cheers Jamie

[MRW82]

One example, I was towing a car trailer (with a suzuki Sierra on it) and found the torque converter wasn't locked the majority of the time, unless I kept the speed above 105. Revs were around 2200rpm at 100, instead of sitting just under 2000. still drove great, towed great, but trying to take it easy towing was actually harder on the transmission. I Don't like the idea of locking it into 4th, revs jump by 500 rpm

The Diesel engine is a torquey little bugger from right down low, there is no need for torque converter slip in those conditions, the engine can handle it easy. If I could manually select to lock it, problem solved. Not sure where the petrol makes it's peak power, but I think it would benefit in the same conditions.

The other advantage would be 4wd downhill descents, low range, 1st gear, torque converter locked would give great crawl control. But the brake pedal lockout could be an issue. James would it be possible to incorporate a low range lockout of the brake pedal disengage relay (or an over ride of some sort)?

[barcode]

does this also work on the v6 and have the same benifits. if so where is it a benifit and are there any drawbacks for use by the average jo daily driver?
sorry but just trying to understand the concept of this still

[Davis Dieso]

This is great and what I have been looking for.



I would love to try this on my 90 as well, but not sure if I know enough about wiring to give it a go... I might need to bribe my brother who understands electricals.

I've had a bit of a look at the 90 wiring diagram and I can't see any reason why it can't be done on it either..
Suggest you get someone who's clued up on electrical though as it may get too daunting... J

[Davis Dieso]

Right you are, I knew you can shift from D to N without the brake but thought there was an interlock from N to D, but there's not. So the relay IS necessarythanks.

Yeah its one of those things that may not happen but don't want to know about it if it does??? Did I mention I get 0.5lt/100km better economy too?? J

[fridayman]

This is great and what I have been looking for.

I'm keen to give it a go - just haven't had time to look into it yet. Hopefully I can adapt your design to suit the 90 series. How have you found yours now you have had it in for a while DD?

Cheers Ben.

I would love to try this on my 90 as well, but not sure if I know enough about wiring to give it a go... I might need to bribe my brother who understands electricals.

[MRW82]

Right you are, I knew you can shift from D to N without the brake but thought there was an interlock from N to D, but there's not. So the relay IS necessarythanks.

[Davis Dieso]

That is correct MRW82, however, it is possible to shift from N to D and N to R without putting foot on brake. Should you accidently/unnkowingly lockup the convertor (while in N) and then shift into R or D it might not be a good look, if you know what I mean?? It may not be necessary to have the P lockout but I included it anyway just incase the brake cancel didn't work.
Yes it is damn good, considering it can be done for $20.00 and whole lot of time mucking about to do the job, but WELL worth it, believe me. I think towing will be better still, it should just show up the shortfall of the convertor even more. As you say, the benefit of a manual in an auto.
Cheers, Jamie

[MRW82]

This is fantastic jamie. I imagine it would be great for towing. The no slip power/drive of a manual with the clutchlessness of an auto. I'm going to get my auto electrician mate to wire it up into my D4D.
Although I do feel the park/neutral lockout is redundant as the shift lock means you have to have your foot on the brake pedal to change to/from those gears, which foot on brake =lockup disengaged. Can you see any problem with leaving that relay out?

[Davis Dieso]

Its been a month or so now and haven't done any towing yet but will do in 3 weeks so keen to try it out.
I can't imagine driving without it now. I lock up the convertor once in second gear and it changes up smooth and direct. Quite a gap between 2nd and 3rd with a smaller gap between 3rd and 4th. Kick downs from 4th to 3rd (eg) aren't an issue. As I've said before, it'll go right down to 40km/hr with slight throttle in 4th, starts to get a little growly! Remember, anytime touch the brake pedal cancels the lock up.
My advice to anyone contemplating... Just do it.

[Graz]

It makes a huge difference to the cruise control.On slight hills it only kicks back 1 gear instead of 2. and even when you come across a steeper hill the kick back is not as violent.

[Anth120playdo]

Appreciate your efforts dd.

[Torrie 72]

I'm keen to give it a go - just haven't had time to look into it yet. Hopefully I can adapt your design to suit the 90 series. How have you found yours now you have had it in for a while DD?

Cheers Ben.

[Davis Dieso]

Anyone had a crack at this yet??

[Davis Dieso]

Yeah 120d4d, it will be a bit daunting reading it all first up,but when its boiled down to bit by bit it may make a bit more sense. I don't know how it would differ for a D4D?
just message if in trouble...
Cheers, Jamie