Thursday, November 23, 2006 - 12:58 pm, by: Mark Paddick(Sparks)
One other thing that many won't notice is that the lock-up clutch in the torque converter will not operate above the speed-cut speed unless it is already engaged when passing that speed. Even then the differential between speed sensors will soon be great enough for the ECU to decide the 'box is slipping and the clutch will disengage. it will not engage again until the speed sensors match i.e. you slow down below speed cut. This is a failing of all speed cut devices available. It could be overcome by using 3 speedo correctors, one on each speed sensor input of the ECU, all set to the same correction factor. This way the ECU never gets a speed signal above the speed cut level and all the speed sensors match so the ECU can control the gearbox properly. The only downside is that the car speed, and therefore gearbox speed, can be significantly higher than the ECU thinks so some of it's gearbox operating decisions could still be a bit suspect. This is nowhere near as likely as with the normal speed-cut defender and all the other problems are fixed properly.
BTW Four speedo corrector kits (3 for speed cut and one for speedo correction) are less than $200 from Jaycar. If the speedo and speed cut correction factors are the same you can get away with 3 kits by taking the speedo input from after the speed cut corrector..
Friday, November 24, 2006 - 08:33 pm, by: Dan McColl(Hoon)
That is the speed cut remover I have. It's wired into some wires at the bottom of the engine ECU.
I went and had a play yesterday (please note, this was on a non duty runway at an airport, Please, Please do not do this on a public road.)
Any way, My speedo shows up to 180, then sits on 180. My car usually changes to 4th at 178 - 179 kph. I can hold it in 3rd (OD off) until it bounces off the rev limiter. Then by releasing the OD button it will change to 4th. It will do this at WOT, with or without the kickdown switch operated. It will also do this at any throttle percentage below WOT. Mashing the happy pedal above 180kmh will not invoke a kickdown.
The only thing that can trick it is to press the OD button well over 180, then it will kick down.
I can get 7500 rpm without any other mods. hehe.
So that's what it does. I only just noticed the spelling error on the case of the speed cut remover.
Note: It will do over 200. I guess I've been to about 220 - 230 based on RPM.
Saturday, November 25, 2006 - 01:16 am, by: Mark Paddick(Sparks)
Can you tell if the lock-up is working?
Cruise should be fine as long as you don't alter the original speed signal to it so the ones that do affect cruise operation aren't wired to the correct spot. I wonder what the ECU is doing with the ECT slip error that is definitely gets? Obviously not much. It possibly is ignoring it because the other two sensors are still in sync. I'd love a better focus shot of that board if the chips aren't custom. And how many wires does it actually intercept? And which ones?