On the 4.4 V8 Diesel Range Rover L405, the diesel particulate filter (DPF) is fitted because it is a requirement in the European market which uses Euro4 fuel, but here in Malaysia the diesel quality of Euro2M basically means that the DPF clogs up and the engine ends up running very very badly. I am not a tuning expert (by any means whatsoever) so I am looking for advice on how to remove the DPF and re-tune the engine ECU to run without it, thereby permitting a lower grade diesel fuel.

Land Rover manufactures the diesel L405 without the DPF for export, so customers buying from the official dealer don't have the problem - the problem occurs in the grey import market where pre-owned cars are imported and sold here.

Can anyone out there advise me on this?

If there are no sensors on it, just cut the pipe and fit a short length of tube in place of the DPF. I doubt you need to re-map but could be wrong.

There will be a upstream and downstream sensors to measure pressure difference to judge on how full the dpf is and when to regenerate it. It will have to be erased from the ecu by reflashing it. Seen as it is a fairly new car and the systems are interlinked etc it could be a challenge but it show be able to be done. Best to shop around in local area

matt1987 said:

There will be a upstream and downstream sensors to measure pressure difference to judge on how full the dpf is and when to regenerate it. It will have to be erased from the ecu by reflashing it. Seen as it is a fairly new car and the systems are interlinked etc it could be a challenge but it show be able to be done. Best to shop around in local area

Click to expand...

Wouldn't the system just think the DPF is very clean if there's no pressure differential - or if there needs to be some then surely a resister fitted to the downstream (or upstream depending on which way round the readings work) to fool the ECU into thinking there is a pressure differential.

Get two voltmeters and read both sensors at the same time - work out what resistance is required to create the voltage differential.

Look up Ohms law - it's easy enough.
V
---
I*R

I think the situation is that the DPF does clog up more than the regeneration can handle because of the crappy diesel fuel and then this adversely affects the engine running and the ECU tries to deal with it but its not programmed to deal with the scenario. The DPF has definitely got to come out but somehow the ECU has to be programmed to forget all about the DPF otherwise, well, otherwise what? I don't think anyone has yet just removed the DPF.

It has occurred to me that if Land Rover are building 4.4 TDV8's for export without a DPF they have obviously produced an ECU mapped to run it! I just need the part number - anyone with Microcat Live out there?

Or even just a local Land Rover dealer who, for a fee, might be able to reprogram the car with the local software for the Malaysian market?