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AWD Discussion A forum dedicated to the AWD systems fitted to Volvo cars. |
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Not all 4 wheel drive systems are equalViews : 2770 Replies : 9Users Viewing This Thread : |
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Jun 18th, 2017, 21:04 | #1 | |||
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Not all 4 wheel drive systems are equal
I stumbled across this video and found some of the results surprising. no Volvos tested but still interesting.
Some of these systems leave a lot to be desired. https://www.youtube.com/watch?v=t09ExAUgtyE
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Jul 1st, 2017, 09:40 | #2 |
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Hmmm that's a bit of a propaganda video but does make some key points. All post 2003 AWD Volvo models are haldex based as it the Passat but Volvo do their own software so they may behave differently.
This is an interesting vid.... https://m.youtube.com/watch?v=tpp5tW71qYI Early model XC90 doing its thang at 9mins, XC70 at 26 min and XC90 again straight after.
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Jul 1st, 2017, 10:27 | #3 | |
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Quote:
If both front wheels are spinning on rollers then the 4wd will no engage so what are they proving? Manual 4wd like a land-rover would always have drive to both axels so would drive over the rollers but what does it prove?
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Jul 1st, 2017, 20:08 | #4 |
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At a guess, I was hoping these systems would detect the rear wheels were not rotating and hence there was a problem.
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Jul 1st, 2017, 23:50 | #5 | |
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Quote:
It gets tricky when one wheel on an axle is spinning as it will then rely on the traction control system to apply the brakes to the spinning wheel thus sending power to the stationary one.
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Jul 1st, 2017, 23:56 | #6 |
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Hmmm, that didn't seem to happen on the Volvo?
I looked at it and thought maybe the 4wd was happy if both front wheels were rotating at the same speed? Maybe not, would be interesting to know for sure?
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Jul 2nd, 2017, 08:21 | #7 |
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They seem to do okay when it's one front wheel on the ground but not so well when it's one rear wheel. I think this is because with just one wheel of the axle on the ground the car is relying on both the AWD system to send power to both axles and the traction control to brake the free spinning wheel. On an older car, the rear brakes are more likely to have weakened than the fronts?
The other thing I would add is there are not many real life situations where you would have zero traction on three wheels. Interesting the older V70 in this second vid which has thermo viscous coupling based AWD does okay on the one rear wheel test..... https://m.youtube.com/watch?v=CQPNH4XRbWA
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