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chrisbrad66

New Member
Hello all, i am just wondering if there is a way of upgrading or modifying the 2.5 diesel auto box so it slips less? i.e fitting different e.c.u or reprogramming or different torque convertor? any one any ideas? i hate working the engine so hard all the time for little speed.
 
How is the ECU going to stop the torque convertor slip? Check your fluid it should be pinkish, if it's dark or brownish you may have engagement clutch slip which is a far more serious problem.
 
fluid is a nice red/pink colour, on other autos i have owned they didnt slip no where near as bad as these range rovers do, just wondered if there was a mod to make it slip less, had my trannie checked by ashcrofts and they reckon it's as normal, but forgot to ask if it can be modded in any way, it doesnt slip at all when in lock up which suggests as ashcrofts said the transmission is fine,
 
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Ashworths do do an upgrade for the diesel box. They fit the 4.6 internals and a larger torque converter. Cost £750 for stage 1 last time I checked.
 
Ashcrofts also do an adjustable replacement for the ECU I believe where everything can be set including pump pressure.
Personally I think the torque convertor is too small/wrongly specified, I agree it allows too much slip but it is a 2.2 tonne vehicle with a small engine.
 
Datatek said:
Ashcrofts also do an adjustable replacement for the ECU I believe where everything can be set including pump pressure.
Personally I think the torque convertor is too small/wrongly specified, I agree it allows too much slip but it is a 2.2 tonne vehicle with a small engine.
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With the Nanocom you can reset the gearbox ECU adaptive values. Whether that would help or not i don't know.
 
I believe the boxes are the same but the drive plate not. I think that in the diesel p38 its triangular and in the 4.0 its round, so they need to adapt the 4.0 torque converter fixation to mach the triangular drive plate in the diesel.
They do that for the Td5 wich also has a triangular drive plate but i dont know if it's the same as the p38.
Sorry if im saying something absurd here, i have no experience with this whatsoever, just from what i read.
I emailed Ashcroft about this some time ago but got no answer.
Hope you can understand what im saying, my english is just so so.
 
JotaPê;1795688 said:
I believe the boxes are the same but the drive plate not. I think that in the diesel p38 its triangular and in the 4.0 its round, so they need to adapt the 4.0 torque converter fixation to mach the triangular drive plate in the diesel.
They do that for the Td5 wich also has a triangular drive plate but i dont know if it's the same as the p38.
Sorry if im saying something absurd here, i have no experience with this whatsoever, just from what i read.
I emailed Ashcroft about this some time ago but got no answer.
Hope you can understand what im saying, my english is just so so.
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Yes i understand. Point is that i think the 4.0 torque convertor and gearbox, apart from the bell housing, are the same as the diesel. The torque convertor has four bolts retaining it to drive plate. If the TD5 has a trangular drive plate then there maybe only be three retaining bolts. This is possibly the mod they do to the convertor.
 
Diesel and 4.0 have the same torque convertor, it was bigger on the 4.6 for a while.

Tony, re-set adaptive values on the auto box? That's a new one on me. It's supposed to adapt to driving conditions and driver but that is a contiuous process as far as I can see and can't be re-set?
 
Datatek said:
Diesel and 4.0 have the same torque convertor, it was bigger on the 4.6 for a while.

Tony, re-set adaptive values on the auto box? That's a new one on me. It's supposed to adapt to driving conditions and driver but that is a contiuous process as far as I can see and can't be re-set?
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According to Nanocom manual you can reset adaptive values of box if you fit a new ECU or box. Will give it another read, but think you can return ECU back to presets with it. I would think if the car did a lot of towing the ECU would learn and adapt to that use. If you then stopped towing with it would it return to it standard trim. I don't know. Go on Nanocom site and read the manuals. Tell me your interpretation.
 
wammers said:
According to Nanocom manual you can reset adaptive values of box if you fit a new ECU or box. Will give it another read, but think you can return ECU back to presets with it. I would think if the car did a lot of towing the ECU would learn and adapt to that use. If you then stopped towing with it would it return to it standard trim. I don't know. Go on Nanocom site and read the manuals. Tell me your interpretation.
Click to expand...


With a new ECU you have to preset some values on the petrol version, I can't remember if it's all petrol versions, or "damage may occur to the box"
As far as I'm aware it's a one shot process but I'll look into it when I have a mo:) Nothing to do on the diesel version.
 
Datatek said:
With a new ECU you have to preset some values on the petrol version, I can't remember if it's all petrol versions, or "damage may occur to the box"
As far as I'm aware it's a one shot process but I'll look into it when I have a mo:) Nothing to do on the diesel version.
Click to expand...

Well just hand Nanocom powered off USB, i can't find any reference to it on the menus. So maybe it just applies to the petrol setup as you say.
 
wammers said:
Well just hand Nanocom powered off USB, i can't find any reference to it on the menus. So maybe it just applies to the petrol setup as you say.
Click to expand...


Right had time to check up on this stuff. There are indeed 3 types of torque converter, the diesel is 260mm diameter, the 4.0 and 4.6 use 280mm diameter. On 4.6's up to MY99 the torque converter is longer than the 4.0 after MY99 the 4.0 and 4.6 use the same torque convertor.
The EAT ECU after 99MY on all petrol models implements CANBUS, on this ECU there are 2 calibrations, one for the 4.0 and one for the 4.6, when an ECU is changed the correct calibration must be selected or premature wear will occur. An ECU removed from the car remembers the calibration and need not be changed if being re-used with the same engine type.
There is no calibration on diesel EAT ECU's or pre 99MY petrol.:D
That lot is from RAVE, however I have read elswhere that the 4.0 and diesel have the same torque convertor:confused:
 
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