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| freddie206 Member Since: 18 Oct 2015 Location: Skipton Posts: 90   
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I also fitted the Discovery cruise control to my Td5 and have the same “symptoms” as you describe. From what I’ve read/learnt on here it behaves like that because the cruise control built into the ECU is fairly rudimentary. As far as I’m aware there’s nothing that can be done but I’d happily be corrected.
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4th May 2022 9:21pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17452 
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My Disco2 does this, it is really a very rudimentary system.
There is a road near here which consists of a series of humps and dips. Using the cruise control along it is both hilarious and disturbing, since when you go up a hump the vehicle slows, then accelerates as hard as it can, flies over the top creating a feeling of weightlessness, starts to rocket down the other side and spontaneously comes right off the power at about the time you get to the bottom of the dip causing it to slow right down just in time for the cycle to repeat. It is a very strange ride, and one which people would pay for at a fairground. |
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4th May 2022 11:06pm |
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| Penfold_6290 Member Since: 22 Sep 2021 Location: Dorset Posts: 320 
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Same here I'm afraid. Very hard to get a nice steady speed unless the road is very flat, the faster you go the worse it gets.
It is better than nothing but does take some managing. |
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5th May 2022 7:33am |
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| Intercept Member Since: 27 Feb 2017 Location: Suffolk Posts: 587 
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Mine is the same. The surge/backoff depends on RPM - if it's within the turbo's high boost range then it's worse, but at low RPMs it is good. I'm wondering about talking to my remap guy at Empire to see if it is possible to detect the CC engagement and dial back the boost.
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5th May 2022 10:04am |
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| phillips321 Member Since: 16 Dec 2021 Location: UK Posts: 103 
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I’ve noticed it’s much worse since my stage2
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5th May 2022 10:14am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2859
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Hmmm.....l have the two button cruise control on my TD5 and don't experience this issue, except when you try to use it at low speeds, where it can struggle to maintain a steady speed. On the rare occasions l want to use it at under 40mph l find it works better in 4th gear than 5th
At motorway speeds it's fine, l've used it continuously for hours driving to Scotland. My TD5 has a mild remap around 25% more power and torque l was told. My cruise control is the "wiring harness and two buttons" Nakatanenga one, that you can actually make yourself. |
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11th May 2022 8:03am |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039  
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I have a tuning box and I have it wired that way it only works at full throttle and not if CC is regulating the speed.
So it doesn't feel harsh at all. OK it is slow to react. My only hills are fly-overs so there I feel I loose speed and when I am almost on the top it is back at the set speed and when it goes down again I am low on speed again where it gets flat. That is a bit strange for a car behind me but I don't worry to much about that. Roel 1984 90 2.5 na Diesel - RR V8 (1994-2001) 1997 Camel Trophy Discovery 300TDI (2001-2009) 2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts. 2003 90 Td5 (2009-now) |
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11th May 2022 8:26am |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 625  
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It is possible to change cruise controll parameters the "same way" as remaping ECU for more power.
I have cruise control in Discovery 2 and Def 130 - both with some more power, both on the heavy side and it works, but I use it mainly on highways for cruising around 100 km/h during long trips. The switch on is not super smooth, but when switched with gently manipulation of throttle (slow release of pedal), it works nice. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo  |
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11th May 2022 8:36am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17452
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I imagine that this is simply because when the CC tells the ECU to accelerate with 80% throttle (or whatever percentage it uses) there is more power available so the vehicle accelerates faster. It will then similarly be much more noticeable when it comes off the power. |
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11th May 2022 5:04pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2859
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l think it must be possible to change how the cruise control works in the software because mine is really smooth in operation even on flat roads or roads that go up/down.
When it accelerates in cruise it comes on the power gradually rather than flat out. One exception is when pressing the "resume" button, again the power builds rather than full power immediately, but it seems to be able to summon up more acceleration than l can get out of it with the gas pedal !! l can't explain the uneven operation of the cruise control on your Defenders, except to say that mine doesn't do it. |
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11th May 2022 5:33pm |
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