Discovery 2 transmission remap

Quick reply to all:

If the Hunter DI is installed it should make no difference to ANYTHING other than the dash display, it's purely cosmetic, but still a handy mod.

The slabs ECU could be "remapped" to fix this without the Hunter DI and that would change how the entire drivetrain behaved.

I.E. engine, torque converter, auto shift.

twr7cx:

The TCU can be mapped to stay in any gear until whatever speed you want... Or many many other possibilities!

And yes, you can tell what gear you are in by the solenoids settings in the D2 auto box section of the nanocom... But you'll have to calculate it yourself.

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Originally Posted by shack

Quick reply to all:

If the Hunter DI is installed it should make no difference to ANYTHING other than the dash display, it's purely cosmetic, but still a handy mod.

The slabs ECU could be "remapped" to fix this without the Hunter DI and that would change how the entire drivetrain behaved.

I.E. engine, torque converter, auto shift.

twr7cx:

The TCU can be mapped to stay in any gear until whatever speed you want... Or many many other possibilities!

And yes, you can tell what gear you are in by the solenoids settings in the D2 auto box section of the nanocom... But you'll have to calculate it yourself.

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Are you talking about if the speedo correction is mounted to affect only the dash? Most are connected in at the SLABS output, shouldn't that affect everything other than the SLABS itself?

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Originally Posted by shack

I know a couple have mentioned that over the last few years, and I guess personal preference comes in to the deal.

From what I can see in the mapping and research I've done, all it does is stays in each gear longer on Accel, will drop back a gear sooner at the same torque request( I.E. 3<4).

It will also drop out of TCC lock at higher rpm.

The feeling off how the car drives may also be down to the individual tune that is installed as well.

But with a TD5, is important to remember that maximum efficiency is theoretically at about 2k RPM, so the further we run from that, the less efficient it probably is.

Anyway, that's my take!

And if you like sport mode and how the car currently goes with the stock TCU, leave it alone and enjoy your car!

Cheers
James

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You will have you're development program. I just like the early kickdown of S mode but also think it locks up too late.

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Originally Posted by Slunnie

Are you talking about if the speedo correction is mounted to affect only the dash? Most are connected in at the SLABS output, shouldn't that affect everything other than the SLABS itself?

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If that's the case then I was wrong, I thought they were only fitted to the Speedo input somewhere, apologies for that.

When I installed my Hunter DI Speedo corrector I interrupted the PWM speed signal right at the SLABS unit, and not at the instrument pack.
My naive expectation was / is that connecting there would mean that the corrected signal would continue to be shared to ALL the devices that require a speed signal input.

Talking to my mechanic son just now and he reckons that the later lockup speed I experience is likely related to the increased load that the TCU sees now that I’m running non standard tyres.

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Originally Posted by onebob

Talking to my mechanic son just now and he reckons that the later lockup speed I experience is likely related to the increased load that the TCU sees now that I’m running non standard tyres.

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I'll look up a wiring diagram later when I get 5 to double check.

And yes, your mechanic son is bang on about additional load altering lockup points.

But you could have a couple things going on if indeed you are also "correcting" the signal to the TCU.

Hey Shack
Is it possible to modify the torque setting that puts Mario and Stan on or is this controlled via the ECU?

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Originally Posted by RRT

Hey Shack
Is it possible to modify the torque setting that puts Mario and Stan on or is this controlled via the ECU?

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I'm not aware of any "torque setting" at this stage, but there could be one.

However, don't forget that the TCU can't actually work out what the torque is, it gets sent a signal over the canbus of ESTIMATED torque, and adapts itself to that.

What is probably happening is a P0722 fault, have you seen that?

That happens when the torque converter is slipping more than what the TCU tune specifies as acceptable.

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Originally Posted by shack

I'm not aware of any "torque setting" at this stage, but there could be one.

However, don't forget that the TCU can't actually work out what the torque is, it gets sent a signal over the canbus of ESTIMATED torque, and adapts itself to that.

What is probably happening is a P0722 fault, have you seen that?

That happens when the torque converter is slipping more than what the TCU tune specifies as acceptable.

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That's the one!