VM

[welling4x4]

Can any one HELP. I have a range rover with a factory fitted VM engine. on road it goes very well off road BUT off road the engine won't pull the skin off a rice pudding. I have changed the fuel lift pump with a new original one. I changed the fuel filter. fitted new pipe work from tank to lift pump & now I am @ a loss & am calling on the more experience off roaders for help. THANKS.

[taurion]

I presume you want a bit more torque at low engine speed to solve your off road problem. My RR works on the farm and tows a 3.5t trailer. To improve the general drivability I have tweeked the fuel pump. 3 turns on the knurled nut in the fuel pump under the turbo diapragm brings in max turbo boost at 1500rpm. But.... Max boost pressure 1 bar , max EGT 600- 700°C, and keep an eye on cylinder head temp, if not a short life. It is the same adjustment that can be done to the 200 /300tdi because they all have the Bosch VE fuel pump.

[welling4x4]

I presume you want a bit more torque at low engine speed to solve your off road problem. My RR works on the farm and tows a 3.5t trailer. To improve the general drivability I have tweeked the fuel pump. 3 turns on the knurled nut in the fuel pump under the turbo diapragm brings in max turbo boost at 1500rpm. But.... Max boost pressure 1 bar , max EGT 600- 700°C, and keep an eye on cylinder head temp, if not a short life. It is the same adjustment that can be done to the 200 /300tdi because they all have the Bosch VE fuel pump.

Thanks very much. I'll have a l@@k to see whats what.