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Sand Setting on Evoque
J77
 

Posts: 1,272
Joined: Jul 2011
Location: Fife
Post: #21
RE: Sand Setting on Evoque

Got it in one. Thumbs Up

18MY Range Rover Velar R-Dynamic SE D240
08-05-2012 07:03pm
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mark_n
 

Posts: 1,720
Joined: Jul 2011
Location: London
Post: #22
RE: Sand Setting on Evoque

I wld have thought that any accumulated transmission windup was released when the viscous couplings were themselves released or the transmission put into neutral.

Mark

Evoque was great, now in an RRS SVR
09-05-2012 04:22am
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lrdaft
 

Posts: 142
Joined: Jan 2011
Location: Aberdeen
Post: #23
RE: Sand Setting on Evoque

Evoque doesn't have a viscous it has a haldex unit in the rear diff to provide 4wd not enough time to explain how it works but in sure someone will provide the answer shortly

Pure sd4 auto Fuji cirrus
09-05-2012 06:33am
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Donny Dog
 

Posts: 773
Joined: Feb 2012
Location: United Kingdom
Post: #24
RE: Sand Setting on Evoque

This appears to give the answer - and, no, it's not a wind-up!! Laughing

"The Haldex Electronic Control Unit (ECU) disengages the Haldex clutch in the centre coupling as soon as brakes are applied to allow ABS work properly. When performing tight low-speed turns (e.g. parking) the clutch is disengaged by Electronic Control Unit to avoid "wind-up" in transmission. When Electronic Stability Programs (ESP) are activated the Haldex is disengaged to allow the ESP system to effectively control the vehicle. This applies under acceleration and deceleration conditions".

Presumably similar disengagement is, or in theory could be, performed if the Evoque was left in 'sand' setting and then run on a low-slip surface such as tarmac.
09-05-2012 01:30pm
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jitenc
 

Posts: 550
Joined: Sep 2011
Location: london
Post: #25
RE: Sand Setting on Evoque

(08-05-2012 09:59am)XFullFatTim Wrote:  Your Evoque, and all 4WD Evoques, use the viscous coupling to determine how much power to send to the rear wheels as well as the fronts. In normal driving something like 95% of the drive goes to the front and 5% to the rear, the viscous coupling can change this to be something like 95% rear and 5% front depending on traction, additionally it can send power from side to side using the ABS and TC to the wheels with most grip.
Launch control, as used in sand mode "locks" the VC and sends equal power to all the wheels. In addition to the VC Evoque and Freelander2 have an intermediate reduction drive, (aka IRD) which acts like a differential. When you go round corners as you know the inside wheels rotate at a differ speed to the outside wheels ( thanks to the differential in the axle) by locking you remove this ability for the wheels to rotate at different speeds, and this manifests itself as damage to the drive system. If you get transmission wind up then there are 2 options to unwind it if you haven't already done damage - reverse round a few corners (inconvenient) or find a slippery surface like wet grass and you might hear the wheel slip or a bang, you hope it isn't a bang!
Try googling transmission wind up or better still take yourself on a Land Rover Experience course as they have a very nice video that explains how diffs, diff locks and limited slip differentials work and what transmission wind up is and how to avoid it.
Sorry I cannot explain very clearly, maybe Richard will do a better job.

Thanks Tim, I think this is the only post that has got me more confused and at the same time interested to see how the whole thing works. I think we need to book a LR Experience for Evoque members only... to mess around in Demo cars... won't really like to mess in mine first...Very Happy

Got mine : Dynamic Fuji White with Lux Pack and black contrast roof.
Optional extras : Privacy glass, Heated steering wheel and TPMS.
Me: Very HappyVery Happy
09-05-2012 02:01pm
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Biker
 

Posts: 211
Joined: Nov 2011
Location: Sydney
Post: #26
RE: Sand Setting on Evoque

I'm assuming ESP is de-activated when in sand mode? If that is the case, you can get wind-up. If not, then no worries.

TD4 180 HSE MY17 Fuji White
09-05-2012 10:22pm
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Donny Dog
 

Posts: 773
Joined: Feb 2012
Location: United Kingdom
Post: #27
RE: Sand Setting on Evoque

(09-05-2012 10:22pm)Biker Wrote:  I'm assuming ESP is de-activated when in sand mode? If that is the case, you can get wind-up. If not, then no worries.

See my earlier post above.
09-05-2012 10:45pm
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crimson_flames
 

Posts: 17
Joined: May 2012
Location: Australia
Post: #28
RE: Sand Setting on Evoque

So Donny, does that mean its ok to use the sand mode on tarmac and go fast on corners?
16-05-2012 03:11am
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Donny Dog
 

Posts: 773
Joined: Feb 2012
Location: United Kingdom
Post: #29
RE: Sand Setting on Evoque

(16-05-2012 03:11am)crimson_flames Wrote:  So Donny, does that mean its ok to use the sand mode on tarmac and go fast on corners?

It doesn't specifically say it disengages at high speed, and I'm in no position to offer any guarantees, but the technology is clearly there to protect the transmission in the cases listed, and I can't see why it wouldn't do so in any circumstance where there was an operational conflict..
16-05-2012 08:33am
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