Thread: diff ratio change

Originally Posted by onebob

In a Discovery 2 the jaycar speedo corrector has not been successful. There are posts on the forum from users. The goto speedo corrector is the HUNTER DI SPARES C6100. A search on the forum will turn up helpful recent and past info on both…

Would be interested if the Hunter one can slow the HDC if it is programmed for it by sending a lower speed to the ECU. Understand that this would still be an Auto SLABS only tweak, but if it could would be a tremendous boon.

Originally Posted by RRT

Would be interested if the Hunter one can slow the HDC if it is programmed for it by sending a lower speed to the ECU. Understand that this would still be an Auto SLABS only tweak, but if it could would be a tremendous boon.

It’s purely a signal convertor and ratio controller. But consider driving “thru” the brakes, it puts you in control of your descent rather than rely on a computer, and it is a very satisfying skill to master and use. The ABS does get a real work out and I had my HDC “give up” 2/3rds of the way down Hearn’s Spur Track on the way out of Wonnangatta.Have never wanted to use it again….

Originally Posted by onebob

It’s purely a signal convertor and ratio controller. But consider driving “thru” the brakes, it puts you in control of your descent rather than rely on a computer, and it is a very satisfying skill to master and use. The ABS does get a real work out and I had my HDC “give up” 2/3rds of the way down Hearn’s Spur Track on the way out of Wonnangatta.Have never wanted to use it again….

Would certainly spook me too no doubt. Was this the brakes overheating or the ABS unit itself? I do see merit in HDC as a tool but again I bow to users findings especially if the descent cannot be controlled in as slow a fashion to be safe. One of the joys of the D1 manual (especially on the 29's) was engine braking down steep slopes - also think it is a discovery thing that the supple ride gives a certain level of safety with regard to traversing rougher terrain at slightly higher levels of speed, not stupid levels, but a little more.Control is paramount and take your point with mastering skills.In doing the upgrades to the D2 one focus was brake performance, with nearly 3 tonne of mass coming down a steep slope not sure cheap generic ebay brake pads are going to cut the mustard and hence the choice of the yellow stuff pads / slotted discs.

By the way still think it is an interesting question as to whether by modifying the speed signal to SLABs the HDC can be slowed down into tricking it think the vehicle is doing 7 kmh when it is only doing three - some modern HDC can be controlled by the cruise control and tap tap up or down for speed.

I don't think HDC is such a big thing. I've found when things are that slippery that low first has enough engine braking. And if its not that slippery then you can just put your foot on the brake and it stops or the ABS works anyway.

Originally Posted by RRT

By the way still think it is an interesting question as to whether by modifying the speed signal to SLABs the HDC can be slowed down into tricking it think the vehicle is doing 7 kmh when it is only doing three - some modern HDC can be controlled by the cruise control and tap tap up or down for speed.

You can't modify the speed signal to SLABS ECU cos it calculates that from all 4 wheel speed sensor inputs, the speed signal convertor is working on the signal delivered by the SLABS