alex_pescaru
Member Since: 12 Mar 2009
Location: RO
Posts: 4642
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Front - Rear -> Haldex
Left - Right -> ABS
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8th Jan 2021 10:57 pm |
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Nodge68
Member Since: 15 Jul 2020
Location: Newquay
Posts: 2082
 
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| Re: Traction Control Question | |
HSFreelander wrote:Hi All,
Can someone explain to me how the TTC system works left to right? I know that slip on a front wheel will cause the Haldex to power the rear but will it also help to power the other (grounded) front wheel?
I've recently been told that to test if you're getting RWD, jack up one front wheel and, carefully, see if you can drive off the jack (I'm not suggesting anyone should - you may damage your car or injure yourself or someone else). If the car feels like it is trying to push off the jack then you've got RWD. If the jacked wheel just spins then you've got trouble. But surely TTC would kick in and just power the other (ground) front wheel, so its not a test for RWD?
Any comment would be really helpful. Thanks
TC works by applying the brakes on the wheels that are spinning faster than the average road speed of the slowest wheels, which is calculated by the TR system. By applying the brakes on the spinning wheels, the axle differential applies more power to the wheels not spinning on the same axle. This all happens very quickly, applying drive in a series of fast pulses, to keep the vehicle in motion.
The front/ rear split isn't a fully variable system, the front being driven directly from the gearbox, via a standard differential. The rear drive is simply tapped off the gearbox, so can add rear drive when needed, but the rear can't get 100%, as the front is always engaged.
Oh and never test the rear drive with the vehicle on stands, as the drive snatches in very fast, so could easily launch the vehicle forward, with unpleasant and potentially dangerous results.
Either have all wheels free of the ground, or test the system on a slippy surface. Hyundai Ioniq 5 Ultimate. The family car.
2009 Rimini Red SE TD4. Gone.
2006 Tonga Green i6 HSE. Gone.
Audi A5 convertible, my daily driver.
1972 Hillman Avenger GT, the project.
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9th Jan 2021 11:09 am |
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