p38 auto gearbox question

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leesp38v8

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Is it possible to program the gear box to change gear better? Mine is a bit silly going from 3rd to 4th feels like its got a gear between the to gears for a second or to. Weird????
 
It will be in 4th then around 50 mph torque convertor will lock giving the impression of a change up. Quite normal. On the V8 you can reset the ECU adaptive values if you fit a new box but you can't do that on the diesel version.
 
Last edited:
wammers said:
It will be in 4th then around 50 mph torque convertor will lock giving the impression of a change up. Quite normal. On the V8 you can reset the ECU adaptive values if you fit a new box but you can't do that on the diesel version.
Click to expand...

Ya dun oil filter etc. This makes senses in what ur saying, I will run the box till it go,s bang and fit a new one. How much r box's these days. Cheers
 
leesp38v8 said:
Ya dun oil filter etc. This makes senses in what ur saying, I will run the box till it go,s bang and fit a new one. How much r box's these days. Cheers
Click to expand...

If the gearbox is behaving nomally and is serviced regularly - why should it go bang? It might out-last the car.
 
leesp38v8 said:
Is it possible to program the gear box to change gear better? Mine is a bit silly going from 3rd to 4th feels like its got a gear between the to gears for a second or to. Weird????
Click to expand...

That's torque convertor lock up/unlock and is normal. There is an ECU replacement available, I think Ashcrofts may do it, that allows the user to change all sorts of settings from oil pressure to change points. Probably a good way of destroying the box if you don't know what you are doing.:D
 
Mine does a weird thing, as you approach 40mph at medium throttle it feels like it changes up and then back half a gear. If your gentle on the throttle it changes up to forth then a few mph later the torque converter locks up like normal.
It will only do it at medium throttle, if you give it the full beans it feels like its got 5 gears & then the lock up.
Its been the same for the year I've had it, and done 10k miles
Changed gearbox oil & filter when I first got it, it made the changes smoother but behaviour was the same.
I just live with it, back off the gas as it gets to 40mph & its fine
 
stewie said:
Mine does a weird thing, as you approach 40mph at medium throttle it feels like it changes up and then back half a gear. If your gentle on the throttle it changes up to forth then a few mph later the torque converter locks up like normal.
It will only do it at medium throttle, if you give it the full beans it feels like its got 5 gears & then the lock up.
Its been the same for the year I've had it, and done 10k miles
Changed gearbox oil & filter when I first got it, it made the changes smoother but behaviour was the same.
I just live with it, back off the gas as it gets to 40mph & its fine
Click to expand...

Slightly stick valve in block most likely. You could try some Lucas transmission treatment with your next oil change see if that helps.
 
Highly recommend Lucas tranny fix, i gave mine a bottle when changing fluid/filter and gearbox just gets smoother & smoother as miles ticks on.

Also recently had all adaptive values reset, changed the behavior but now after 500 miles its same as before - smooth as silk - 114K on the clock

Sure feel the lock up a little like an extra gear, before the lucas fix i must have had at least 8 gears - box all over the place.
 
Usually only use reset with a new box. It remembers the driving style to some degree. So if the bloke who had it before you was Lewis Hamilton and you are a nun, maybe worthwile doing. Can be done with Nanocom if you know somebody who has one for the 4.6 box.
 
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