 | Home > Puma (Tdci) > 2.2 XS, Can you switch off the Traction Control? |
 
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558  
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it's not really vehicle speed but the fact that one or more wheels are turning faster ( spinning )
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25th Feb 2014 11:15pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8203  
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all your ETC commnets - correct in my undrstanding
the issue is how agressively the TC is applied. Simens was far harhser system. in WG example very easy to stall the vehicle with agressive TC responding qucikly. Similar to how TC reactions are the same parameter in M&R as GGS but its a more agressive response in M&R. if it was too agressive in GGS it could stop the vehicle (momentum wise) Cheers James 110 2010 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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25th Feb 2014 11:16pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018  
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I was thinking more of the open centre diff meaning it would not be possible to spin a wheel on both axlexs. The ABS module monitors the signal from the differential-lock unit and depending if differential-lock is engaged or disengaged, changes the strategy of calculating the vehicle reference speed. The vehicle reference speed is calculated using the longitudinal sensor within the yaw-rate sensor in conjunction with the actual wheel speed. When the differential-lock is engaged the front and rear axles are driven at the same speed and therefore when cornering the front axle will be traveling faster than if the differential-lock was disengaged. If the ABS did not change the strategy of calculating the reference speed it would assume that the reference speed calculated with the differential-lock engaged, as incorrect and consequently a fault code would be stored. |
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25th Feb 2014 11:21pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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I'm quoting from the MY12 Workshop Manual. The vehicle reference speed is calculated using the longitudinal sensor within the yaw-rate sensor in conjunction with the actual wheel speed. Otherwise it would come on if you were turning a sharp corner. |
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25th Feb 2014 11:36pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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yes sorry thought you meant speedo speed
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25th Feb 2014 11:52pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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isn't yaw-rate more to do with stabity control for example if you were stuck in the mud so stationary and tried to drive out but couldn't how would the yaw sensor know what your trying to do as your not moving . the traction control still works ever if your not moving by the wheel sensors giving speed readings for each wheel think the different wheel speed has to be greater then different speed given by cornering as if you stop one wheel the other wheel on the same axle travels twice the speed |
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26th Feb 2014 12:25am |
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| Natlas Member Since: 20 Mar 2013 Location: West Sussex Posts: 462 
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Hi Guys,
Just found out that you can temporarily disable traction control by lightly touching the brake pedal with your left foot - seems to work and help in deep mud. Cheers, John 2.2 90 XS 88" Series One Old Norton 
Minerva |
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6th Mar 2014 10:04pm |
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| pjw4233 Member Since: 30 Nov 2009 Location: Lake District & Cheshire Posts: 273 
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Interesting topic
Surprised to hear TC can stall the vehicle, in theory it shouldn't brake more than two wheels at any one time, especially with the older system which worked independently on each axle. That means with the older system, even with TC you would only have drive to one axle. The new system is four way, working on all four wheels, so in theory you can get away with not using the CDL like in the Disco 2, though there would be more wheel spinning involved. Personally I'd always use the CDL for better control. Interesting fact, with the CDL locked, the hand brake works on both axles, as they are locked together, which is one of the reasons I'd have it locked off roading. Personally during a failed hill, I wouldn't waste my time with the hand brake, the sooner you are in reverse gear and let out the clutch pedal, the sooner you are in control. Last edited by pjw4233 on 7th Mar 2014 12:26am. Edited 1 time in total |
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7th Mar 2014 12:17am |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443 
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"Personally during a failed hill, I wouldn't waste my time with the hand brake, the sooner you are in reverse gear and let out the clutch pedal, the sooner you are in control."
That's when I found the brake pedal solid and unresponsive and off we went, me as a passenger  |
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7th Mar 2014 12:25am |
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| pjw4233 Member Since: 30 Nov 2009 Location: Lake District & Cheshire Posts: 273
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I can see where you are coming from.
I've had quite a few failed climbs whilst doing TYRO/RTV events, as soon I feel the climb is going to fail, I'm in reverse gear before gravity takes over. I never waste time with the hand brake and don't normally waste time with the brake pedal. I've surprised a few people doing RTV in a standard Puma, TC when used correctly makes the vehicle very competitive. |
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7th Mar 2014 12:37am |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443
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Second to reverse on a sloppy well worn Td5 110 is not a slick, split second affair, not on mine anyway
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7th Mar 2014 12:42am |
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| pjw4233 Member Since: 30 Nov 2009 Location: Lake District & Cheshire Posts: 273
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I guess I have that to look forward to, in the near future |
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7th Mar 2014 12:51am |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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 as per the workshop manual:
"ETC is activated if an individual wheel speed is above that of the vehicle reference speed (positive slip) and the brake pedal is not pressed." |
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7th Mar 2014 6:19pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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I'd disagree with this and your later post about not even bothering with the footbrake. You may speed up getting back in control, but that's only because your technique puts you out of control in the first place by using the clutch before you have stalled. If you are in a timed competitive event that may be a corner worth cutting but not in normal circumstances. |
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7th Mar 2014 6:25pm |
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