 | Home > Puma (Tdci) > Puma MY11 Traction control |
 
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2633   
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Bruce, the TC on mine (MY10) is very sensitive, sometimes even engages when I hit potholes, so it sounds like his TC is not engaging as it should? As for pre- & post-MY11, the difference is when the CDL is not engaged. IIRC, on pre-MY11, the TC works only on each axle, whereas on post-MY11 it works across both axles, much like the 4ETC on the D2. -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged 
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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13th Apr 2012 10:02am |
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| BruceT Member Since: 01 Nov 2010 Location: South Africa Posts: 517
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Thanks Naks that is what I have experienced with mine also.
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13th Apr 2012 10:10am |
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| MartinK Member Since: 02 Mar 2011 Location: Silverdale (Lancashire/Cumbria Border) Posts: 2665  
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When I did a Land Rover Experience day, we cross-axled a 110 with TC/ABS (mine's a County so I doesn't have this!), you needed to get the revs up slightly (over 1000rpm, and probably nearer 1500rpm) for TC to kick-in...Otherwise it just sat there, cross-axled with the wheels spinning... Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's)
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13th Apr 2012 10:18am |
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| BruceT Member Since: 01 Nov 2010 Location: South Africa Posts: 517
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Thanks you Martin.
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13th Apr 2012 10:33am |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3639 
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would be interested to know more about how the TC behaves as I have never seen the light flash up on my 2011MY DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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15th Apr 2012 3:48pm |
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| bm52 Member Since: 04 Apr 2010 Location: Kent Posts: 2189 
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on my MY10 90 when cross axled the TC kicks in at quite low revs, almost on tickover, the TC combined with the anti stall seems to work in tandem? BM52
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15th Apr 2012 4:18pm |
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| Landie Boy Member Since: 14 Jan 2011 Location: Essex Posts: 431 
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This is the same for me, a LRE instructor said that they changed it around this point so considerably more revs were required... not sure whats the benefit of doing this? Jack |
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15th Apr 2012 4:29pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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Probably to make it less sensitive and stop it kicking in over speed bumps and potholes. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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15th Apr 2012 5:14pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7993 
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don't get hung up on the revs, its the wheel speed that it pics up on, yes higher revs higher wheel speed but you could be in a higher gear for any given engine speed so not necessarily rpm related.
Pre11MY was a seimens system and worked across axle only, ie say front axle, it monitors both wheel speeds and brakes one of the wheels if its going a certain % faster than the other wheel it is monitoring on the same axle. It does not take into account what the other axle is doing. With CDL unlocked you could have two font wheels doing 30mph and the rear axle wheels stationary and the ETC wont do anything about it. 11MY is bosch system and works on sensing all 4 wheel speeds relative to each other not just 2 across any one axle. therefore for Post 11MY you dont need CDL locked for it be most effective. all other LR platforms use this 4 wheel speed sensing option. ETC (all systems) works by applying a breaking force to a wheel if it is determined that wheel is spinning a certain % faster than other wheel(s). this in itself adds load to the vehicle so an increase in engine speed can be required. the greater the speed of the spinning wheel in relation to the other wheel(s) the quicker and more effective ETC will respond and act. so at idle low 1st one wheel doing say 5mph (in the air) the other 3 stationary ETC will work but it will respond quite slowly and wont brake that hard or for that long as the speed differentiation between that wheel and others is low. If you were to increase the speed of that spinning wheel ( up a gear same revs or more rpm) to say 30mph ETC will react alot quicker and brake the wheel harder and for longer periods. (it doesn't actually brake it constantly is cadence brakes it (max amount is 10 times a second)) this is why you get a lurching effect at low speeds when ETC cuts in when the speed differentiation is not great enough for the wheel to be braked long enough to allow you to move forward. (which occurs by the power taking the other route through the open diff) Tgt speed for Siemens and Bosch systems i believe is the same. BUT Bosch system is not so aggressive when it responds at low speed differentiations and is therefore not always felt or experienced as much when comparing it to pre11MY. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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15th Apr 2012 8:37pm |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3639
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James
thanks for the eloquent response I understand now. when is the next Green Laning Trip, it would be great to join you again in the summer and test out the TC all the best Rob DEFENDER 90 TDCI XS, I hope everyone is well and your land rovers make you happy |
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15th Apr 2012 8:48pm |
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| bm52 Member Since: 04 Apr 2010 Location: Kent Posts: 2189
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James, thanks for the great explanation BM52
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15th Apr 2012 8:50pm |
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| bm52 Member Since: 04 Apr 2010 Location: Kent Posts: 2189
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James, thanks for the great explanation BM52
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15th Apr 2012 8:50pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7993
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anti stall will work as the name suggests to stop it stalling, as ETC works it stuff it increases engine load, antistall increases fuelling to overcome the extra load. on pre11MY in extreme circumstances with no driver interaction ETC can stall the vehicle. it can still stall a post 11MY but its less likely to as the ETC doesnt work as harshly at the lower engine speeds where you are relying on anti stall. and yes we do spend alot of time on rollers testing these things! Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop Last edited by jst on 16th Apr 2012 6:03am. Edited 1 time in total |
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15th Apr 2012 8:53pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7993
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no worries. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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15th Apr 2012 8:53pm |
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