Auto gearbox modification

[BUSHWHACKER]

Simplicity is my middle name.

Hahahaha!! Yeah right, you still 'dicking' around with your website?

[MattF]

Uhh.. I cant believe you'd suggest something so simplistic mate! Maybe you really did move into hairdressing...

Simplicity is my middle name. There's less for the f*ck up fairy to ruin that way. If it's just using pulses as you mentioned above, I'd just adapt the timing, personally. No need for overrides or such, and you know that everything is still working as it was intended, just earlier than it would normally.

[Apache]

Uhh.. I cant believe you'd suggest something so simplistic mate! Maybe you really did move into hairdressing...

[MattF]

Don't know if this has already been suggested, (I'll admit, I switched off mentally after around, ooh, say post.......................... ..










one, ), but wouldn't your best option just be to invert the ECT setup?

[Apache]

Why not just invent teleportation and be done with it lol

... Hmmmm... if I connect pin C3 to the input of B11, and invert the output before summing it with the output of the secondary speed sensor...

[The Lovely Boyo]

Yeah, there's two speed sensors and the ECU polls them to ensure they're the same.

The way I'm doing it, if you forget the switch it wont matter. Its not a latching switch, its an electronic latch.

However, I can read the speed (its just a pulse train) and use a comparator to set points at which 'things' happen. Tis another way of doing it. A digital speedo calibrated to GPS to compensate for wheel size is also possible.

Errrrr, wot?

Why not just invent teleportation and be done with it lol

Something tells me you are feeling a little 'enthusiastic' about this one mate!!!!

[Apache]

Yeah, there's two speed sensors and the ECU polls them to ensure they're the same.

The way I'm doing it, if you forget the switch it wont matter. Its not a latching switch, its an electronic latch.

However, I can read the speed (its just a pulse train) and use a comparator to set points at which 'things' happen. Tis another way of doing it. A digital speedo calibrated to GPS to compensate for wheel size is also possible.

[The Lovely Boyo]

There's something in that ECT write up about the ECU monitoring the speed.

Could you knock up an auxillary speed sensor and just use that to blot out the lock up signal below a certain speed????? Or am I being a bit errr 'simplistic' lol

That way, if you forget about the switch it won't matter?????

[Apache]

Yes thanks Andy, thought I'd mentioned that in an earlier thread.

Took in some A-roads on the way in today. Lockup on, OD off, 1500rpm in 3rd at 30mph. Pulls reasonably well with a light foot up to around 45mph. Select OD, smooth shift to OD in lockup, and around 1650rpm.

Down selecting from OD to 3rd at around 40mph was smooth too.

[The Lovely Boyo]

I'm pretty sure that most auto Surfs were fitted with the A340F box.

Some had the built in transfer case which was the A340H (I think, can't be bothered to look).

Andy, did you get that pdf about the Toyota ECT?

[gwh200]

Hehe.

All I'm aiming to do is make something useful, but something numpty-proof which will avoid stuffing the box - which needs more than a single switch.

Andy, tried with OD off on the way home and lockup at any speed forces (what feels like) 3rd gear. I think the ECU must push the box into the highest gear when it detects lockup - this means I can have high geared manual by using the OD button to select 3 - 4 (OD). Obviously, this isn't totally satisfactory, but it aint a bad start for what *I* want!

Incidentally Andy, the changes with OD off are as smooth as with OD on. What box is fitted to the 2.4s?

Next step is to instrument the ECU so I can see the decisions its making in real time. This will probably amount to a bit of veroboard full of LEDs labelled up with their function.

Its really getting interesting!

is there a fundamental difference bewteen the 2.4 and 3.0 liter box ??




geek

[Apache]

Hehe.

All I'm aiming to do is make something useful, but something numpty-proof which will avoid stuffing the box - which needs more than a single switch.

Andy, tried with OD off on the way home and lockup at any speed forces (what feels like) 3rd gear. I think the ECU must push the box into the highest gear when it detects lockup - this means I can have high geared manual by using the OD button to select 3 - 4 (OD). Obviously, this isn't totally satisfactory, but it aint a bad start for what *I* want!

Incidentally Andy, the changes with OD off are as smooth as with OD on. What box is fitted to the 2.4s?

Next step is to instrument the ECU so I can see the decisions its making in real time. This will probably amount to a bit of veroboard full of LEDs labelled up with their function.

Its really getting interesting!

[KERRSURF]

are you re-designing the ECU then.

[Apache]

Like the abuse earlier, if its locked up, you're gonna get get some nasty-ass clunkly gearchanges.

Only in the lower gears I would imagine.

If that does happen, I need to think about an automatic momentary deselection of lockup during up and down changes.

[TonyN]

First I need to know why the box doesn't seem to change down in lockup. You chaps dont know?

Like the abuse earlier, if its locked up, you're gonna get get some nasty-ass clunkly gearchanges.