Member Since: 22 Sep 2014
Location: Hereford
Posts: 2284
I went ahead and reset mine when I bought my IIDTool, I had no idea it could have a negative impact
3rd Feb 2015 12:32 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
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By the book it should not have a negative impact. Indeed, resetting the adaptions is an essential precursor to a gearbox re-flash, otherwise you get a 100kg paperweight.
Resetting the adaptions is, by the book, part of the oil change procedure or any internal repair. Like many gearbox issues the lack of routine servicing has altered the status quo. A gearbox hanging on for dear life will not appreciate new oil. Those that are not quite as worn will survive and welcome the fresh oil but combined with an adaptions reset may again send it over the edge. A properly serviced, or low milage, gearbox will welcome the flush and the reset.
It is one if those areas where judgement and experience trumps what you read in the manual.
As always I will champion the mantra of 'change early, change often' when it comes to gearbox oil. I'm planning my first single flush already. Just got some tooling issues to sort out.
Land Rover - Turning Drivers into Mechanics Since 1948
When mine was rebuilt, they reset the box as part of the procedure - but the comment was always that the gear changes are as rough as a bears for the first 20-30 miles until it sorts itself out. But when ever I've reset mine it just changes the change points until it re-adapts.
So the question is, are there two resets? A standard adaptive reset (Which ISTR the manual says should be done before giving to a new owner) and a full reset of all the clutches?Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
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3rd Feb 2015 8:43 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
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Posts: 72787
I've found the couple of times I've done it my box has become smooth as a smooth thing and the laziness it had was gone. Main thing it lost was the little bit of over revving on change up. I just used the "BMW method" (key in, foot on gas for 30 secs, etc), is the IID reset different and easy safe to do (remember it's diagnostics for dummies)?
06 box with 125k on the clock, double flush done at 81k.
3rd Feb 2015 8:54 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
The vehicle has 2 adaptive systems: one hosted by the engine ECU and one hosted by the gearbox. A gearbox reset can only be achieved by a diagnostic tool.
Gearbox adaptions work when the gearbox can compare the current normal shift with its ideal. If the shift is ok then the system can adapt the pressures required to reduce the delta from the current normal shifts to the ideal. If the shift is unusually harsh then the data is not used for adaption because the delta is too large. Over time the 'ideal' will change to reflect mechanical wear and the shifts will become slower.
When a gearbox is new the 'ideal' is a preset arbitrary value. The ideal is not set too perfect as this would have the effect of rejecting the data from the current shifts as the delta would be too large. A new box will also need a certain amount of bedding in so its underlying performance will change quite rapidly. The adaptions will learn what the gearbox can achieve, the better shifts will be identified and accepted for adaption and the delta between adaptions shifts and the improving ideal set of values. Shift quality and shift time will improve towards the optimum. As driving style will influence the shift quality a certain amount of the performance will reflect driver style. As the box gets older and/or the oil quality reduces the ideal target will move to reflect the lower goal. As you run to the edge of adaption available the margin for driver style becomes very small. Ultimately the adaptions are just seeking a shift that works, with no points for style and grace. The cliff edge approaches....
Change early, change often.
Land Rover - Turning Drivers into Mechanics Since 1948
thread resurrection: after an adaptation reset, is there a specific procedure to get the gearbox to re-learn the shift patterns?
I complained to the dealer about a slight judder when coming to a stop and between 3rd & 4th on hard acceleration and they said they cannot do an oil change but they did reset the gearbox adaptation.--
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
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Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
There is no specific procedure, just drive normally and not to extremes. The adaptions are constrained when the box is not up to normal temperatures, so short journeys will not help.Land Rover - Turning Drivers into Mechanics Since 1948
I have a 50km highway drive to a client this afternoon, will use this to get the box warm.--
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged
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for the first 20-30 miles until it sorts itself out. But when ever I've reset mine it just changes the change points until it re-adapts.
