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Old 22 Oct 2008, 03:46 am
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Default Can the viscous centre differential on a 4WD Honda CR-V be changed to a Torsen centre

differential instead? Or any other more reliable centre differential application.
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Old 22 Oct 2008, 04:01 am
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not really.the viscous setup in the CR-V is built into the nosecone of the rear end, so you can't easily take it out of the driveline or replace it.also, it's not a typical 'viscous diff' you find in many other applications, it's actually a hydraulically actuated pressure plate system. most viscous diffs use the temp of the fluid to engage the clutches, while the CR-V actually works more like the 'gears' of an automatic transmission.the driveshaft runs a hydraulic pump and one set of clutches, the free-rolling rear wheels drive another pump and a second set of clutches. when the driveshaft driven pump out pressures the wheel driven pump (front wheelspin), the excess pressure engages the clutch packs, tying the rear wheels to the driveshaft in a smooth manner.the only real complaint is that the center diff is slow to lock, so honda made the 3rd gen CRV with a set of balls and runners along with the dual-pump setup. the balls and runners (like the old hondamatic transmission from the 70s) pre-engage the clutch packs when the slippage is sudden.all in all, for a normal road driven SUV, it's a pretty clean and simple setup. all contained in the rear diff package, it doesn't have any computers or solenoids to crap out and give up on you. it also works pretty well for a AWD system on the race track...sure, it's not an STi, but with the right suspension and tires, I can run the course nicely.
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