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D2 - Transmission Gearboxes, diffs, drive shafts. |
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#11
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Quote:
I get how having the wheels of one axle on the ground (while the other axle is turning) might be bad for some AWD systems. But I thought we were saying that the axles should (ideally) be turning in opposite directions? That I don't get. I mean, if all 4 wheels are turning in the same direction, is that not the same as the vehicle coasting along the road? Or are we talking about protecting the gearbox here? I can see how opposing rotations might cancel out at the diff, preventing rotational forces from transferring to the gearbox.
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------ ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust |
#12
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Wheels on the same axle should rotate in opposite directions
So lets say we're testing the front axle - spin one wheel forwards and one wheel backwards which will result in net zero rotation of the front diff. In that case its perfectly fine that the rear axle isn't turning. |
#13
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Bear in mind, 10 mins before the brake test they lift each axle and turn each of the wheels by hand, if the car has a "proper" diff you see one wheel turning backward as the other turns forward. Nice reminder to the tester......
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#14
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Here in NI, the tests are conducted slightly differently. The first stop in the building is where the emissions, lights, wipers, seat belts, etc. are all checked by the tester. The next stop is for the brakes and suspension, which is all automated. All the tester does is follow the instructions on screen and press a remote to go to the next step in the checks. The third and final stop is where the car goes up on the lift, with even that mostly automated, as the pads in the lift do the twisting and turning of the wheels whilst the tester is underneath checking the various components.
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