never asked before?

[Apache]

Try ECT and keeping your foot on the floor?

[kitesurf_phil]

Try ECT and keeping your foot on the floor?

I did the embarassing one when I first started towing. I got on this flippin great big hill in Devon. I was getting slower and slower, so I booted it. The revs picked up and so did the speed but I was waiting for the gearbox to change up. After ages, with the engine screaming just below the red line, I suddenly remembered the kick-down. It did change up when I eased my foot off the loud pedal.

[sparkyaj]

EASY SOLUTION!!!!!!!!!

Get a 3L manual like me

[Apache]

All that gearchanging in motorway jams? How very 'working class'

[Steve Letts]

If you want it to come out of lockup without having to kick it down a cog, try lightly tapping your brake pedal and watch the revs. You only have to touch it hard enough to bring your brake lights on and I'll bet it unlocks. (you should see the revs come up by a couple a hundred)
They do this so that when you stamp the brakes in a panic stop the converter unlocks and prevents you stalling the engine. But it has other uses as well.
Expanding that, You could fit a switch that fools your transmission into thinking the brake lights are on, and so holds it out of lockup.

[phoebelala]

Try ECT and keeping your foot on the floor?

But not on wet slippery corners unless you favour the trousers of a brown kind

[Nicc]

Lock up

So does any one know anything more about forcing lock up. Any ideas of where solenoids are / wiring to overide. I'd give it a go with more information.

[Apache]

So does any one know anything more about forcing lock up. Any ideas of where solenoids are / wiring to overide. I'd give it a go with more information.

I've drawn a blank on getting detailed diagrams of the surf AT ECU and the sensor inputs it receives. If you find anything, let me know.

[The Lovely Boyo]

An interesting 15 cents too.

A very interesting 15 cents.

My 2.4 locks up (level road, no acceleration) at 42mph, and will stay locked down to 39mph. So the torquier 3.0l should be at least the same.

Anyway, I used to work at Borg Warner, where we made auto boxes. There was some kind of tie up with Aisin Warner - very similar boxes. As far as I know, the change points are 'mappable'.

Think we all better go on a hunt for those diagrams.......

[dirtydog]

I don't know if the 2.4 is designed to lock up earlier but mine does it a 50 MPH. It is OK most of the time, although it can make the truck suddenly go sluggish when building up to carriageway speed on slip roads. Flicking the overdrive off compensates pretty well.

I would be interested in something that would hold lock-up off until 60 MPH for when I have the caravan on the back, then I won't have Apache gnashing his teeth when he is following.

its called the OD off button Phil! you can get 70+ before needing top gear - not that i try
BTW mine can lock up at 40mph if im gentle but then like you say it can sometimes come too early.... sticking your foot down a bit more usually works around 50ish as it stops it changing too early and leaving you with no oomph.

[The Lovely Boyo]

My 2.4 locks up (level road, no acceleration) at 42mph, and will stay locked down to 39mph. So the torquier 3.0l should be at least the same.

Anyway, I used to work at Borg Warner, where we made auto boxes. There was some kind of tie up with Aisin Warner - very similar boxes. As far as I know, the change points are 'mappable'.

..

EDIT - I think me been spouting Bull shyte. Aren't these boxes overdrive, not lock up torque convertors??????

Been out testing the shift points. OD on and OD off.

I seem to have 1st; 2nd; 2nd od; 3rd; 3rd od; 4th and finally 4th od.

Overdrive is not the same as having a lock up convertor. I need to go away and think, my head is hurting.

http://www.toyotasurf.asn.au/forum/v...verdrive#76197

Apache - maybe one of these - http://www.powertraincontrolsolution...content-4.html

I think the box is the A343.

[Nicc]

Gearchange mapping?

I am busy reading what Lovely Boyo has posted in his links - very interesting.

A thought though;
If all the gears are shifted WRT speed sensor input, if a frequency multiplier was placed in line to the ECU then gears could be programmed to change smoothly as designed but at differing and programmable speeds - couldn't they?!?

Any tech wizards out there that could verify this idea or is it pie in the sky and I am clutching at the proverbial straws?

[Apache]

I am busy reading what Lovely Boyo has posted in his links - very interesting.

A thought though;
If all the gears are shifted WRT speed sensor input, if a frequency multiplier was placed in line to the ECU then gears could be programmed to change smoothly as designed but at differing and programmable speeds - couldn't they?!?

Any tech wizards out there that could verify this idea or is it pie in the sky and I am clutching at the proverbial straws?

Nicc, you're on the right track, but it wont be as simple as that. Speed will be a factor, but so will engine load.

Boyo, are you sure you get 'lock up' at 42mph? I never get it below about 55mph and it always drops out before I drop below 50mph.

My original reasoning is that a lot of flat roads tend to run at about 45mph (such as the bulk of the midlands bit of the A49 on a Friday!) which is why I want to tweak lockup so it didn't drop out until around 40mph.

I'll peruse the diagrams when I get home... Cheers!

[Nicc]

More info

Some information I have found here. As this is my first auto I found quite interesting. (Info on Toyota Auto Trans)

Not sure how to insert this as a hypelink so you will have to paste in your browser;

http://www.autoshop101.com/forms/h16.pdf


Oh it did it automatically!

[The Lovely Boyo]

Boyo, are you sure you get 'lock up' at 42mph? I never get it below about 55mph and it always drops out before I drop below 50mph.

Yeah been testing today - the OD seems to be some kind of lock up????

In first od on or off = no difference.
Second, slight difference.
Third - this is where it gets strange. I seem to have a 'half' gear between third and OD top.

With OD on, Hard revs up to 50mph in third = 3000rpm, then it drops to 2500 which I can hold if I keep revving, then it drops again by another 500 rpm. So I end up doing 2600 at 60mph ish.

The search goes on........