Thread: Discovery 2 transmission remap

Originally Posted by onebob

This mod will be good for those of us running taller tyres - I’d be happy to 80kmh lock up again vs the near to 90kmh I have now …

For sure, one thing I hadn't given much thought was bigger tyres.

Different diff ratios or transfer case gearing would of course be picked up by the ABS sensors so won't make much difference, other than the RPM the engine would be doing, which could be an issue on the torque front if it's too low.

Originally Posted by onebob

This mod will be good for those of us running taller tyres - I’d be happy to 80kmh lock up again vs the near to 90kmh I have now …

yup I was thinking the same.

This is very interesting, thank you for the effort and the post about it, how much effect would it have a I already have a V8 torque converter on my remapped td5, it seems to go alright but is that just because I don't know what I'm missing?

Originally Posted by finallyrangie

This is very interesting, thank you for the effort and the post about it, how much effect would it have a I already have a V8 torque converter on my remapped td5, it seems to go alright but is that just because I don't know what I'm missing?

I don't know.

It'll be better!

In all honesty the lower stall speed converter probably overcomes some of the issues driveability wise of the stuck unit.

It still however locks up at the same speed as the stock one and uses the same shift maps which are not optimised for a tuned vehicle.

When I get a chance I'm going to send out a couple of remapped units, and one will be going on a car with a tune and the V8 converter.

I'm just so busy at the moment!

I'll get the guy to report back here on whether it's worth doing it not.

Originally Posted by shack

Other usual features MIGHT be a towing mode which would replace the completely pointless sport mode.

A TD5 with ECU and IC upgrade I tend to think works better when in sport mode.

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

Originally Posted by onebob

This mod will be good for those of us running taller tyres - I’d be happy to 80kmh lock up again vs the near to 90kmh I have now …

How do the speedo correction units (e.g. Hunter Di) effect this? I know it's correcting the speedometer and odometer reading, but are the ECU and TCU receiving correct speeds or not? I cannot recall where in the wiring the correction happens - pretty sure I followed Slunnie's guide in installing it 10 years ago.
If the TCU speed signal is the uncorrected one this would need to be taken into consideration for those with larger tyres when having a custom TCU remap done.

James - can you program the TCU to prevent entering a gear before a certain speed?
Having previously been involved in playing with Ford Falcons the taxi mechanics and drivers swore that keeping the four speed automatic transmission in 3rd for any driving at 60km/h or under reduced wear and tear on the gearbox etc. I've always followed this in my D2a Td5 and the original auto is now at 320,000km and still smooth - might be connected, might not. But it would be nice to know that I don't actually need to manually shift the auto shifter from D to 3 each time as the TCU is programmed not to shift into 4th gear until at least 65km/h, for example.

Aside from watching out for the change in the engines rpm and feel through the vehicle is there an easy way to see what gear the transmission is and torque converter lock status? I'd like to do some driving being more observant of what's going on so that I could give some consideration towards what I'd rather like to be going on... Does the Nanocom have a screen that displays this?