CHR15E wrote:Makes me glad I drive manuals.
Well aside when the flywheel went on mine last June.
Would that be one of those F-expensive dual mass flywheels Chris?
CHR15E wrote:Makes me glad I drive manuals.
Well aside when the flywheel went on mine last June.
The simplest explanation for the operation of a Haldex is this:scoobyh123 wrote:The Haldex unit is as i thought then, i was trying to keep it simple last night! I know it has full electronic control taking speed inputs from the wheel sensors, gearbox sensors and probably a few others. All this is then processed and the ECU makes adjustments to the clutches, brakes etc within the unit to vary the torque seamlessly - that's about as much as i know about it!
traineefarmer wrote:The simplest explanation for the operation of a Haldex is this:scoobyh123 wrote:The Haldex unit is as i thought then, i was trying to keep it simple last night! I know it has full electronic control taking speed inputs from the wheel sensors, gearbox sensors and probably a few others. All this is then processed and the ECU makes adjustments to the clutches, brakes etc within the unit to vary the torque seamlessly - that's about as much as i know about it!
Imagine the propshaft is separated by a hydraulic pump, the input shaft connected to the pump shaft and the output shaft connected to the pump body. In normal conditions with the vehicle travelling at a steady speed, the pump's shaft and body will be rotating at the same speed and raising no hydraulic pressure. However, as the rear wheels start to slip and there starts to be a difference in the rotational speeds of the shaft and the pump body, the pump begins to work and pressure in the system begins to build. This pressure is used to engage a clutch which also links the props. As the clutch engages the pump body and shaft speeds once again equalise so the pressure drops, clutch disengages, then pressure builds, clutch engages, etc, etc.
And that is how the Haldex can transmit something like 80% of torque before you add in the electronic wheel speed sensors and in-built electric pump which can over-ride the "mechanical" engagement and provide near 100% torque transfer.
I hope that makes sense. For a "simple" explanation it turned into quite a big paragraph.
You could have bought a reasonably good 800 for that Chris and had all the spares you needed! It seems a very retrograde step to make such a complicated clutch though, clutches should be simple IMHO.CHR15E wrote:It would. £700 all in. New flywheel, clutch, concentric slave cylinder and starter motor.
Joys of newer cars I guess?
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