I agree, but i'am not talking about bigger lift pump, but bigger pump rotor(high presure side - plunger/piston is bigger diameter). It's very common pratcice for bosch VE pump tuners(VAG's etc) to fit bigger head and rotor. More fuel is injected in the same time/one pump plunger stroke.
Stock M51 pump internals are good up to 220hp, with 11mm head someone(in Estonia?) achieved 290hp with big turbo. 12mm is to big, and can sieze at high RPM due to lack of lubrication and fuel cavitation.
I've no idea what was done to my setup but, don't nobody tell me again that an M51 is gutless. Here's what I do know. Full size truck (Iveco) intercooler. FIP appears to have been an electronic pump converted to mechanical. There is a sensor of some description with two cut wires opposite the inlet port. It has been tuned to make use of the extra large intercooler and happily belches black smoke on very modest usage of the accelerator. It pulls very well bolted to an LT95 although I'm assuming the gearing hasn't been changed to suit the diesel engine as there is a serious drop in engine revs when going from third to fourth gear. It accelerates like a rocket through the other gears and feels very torquey although I haven't yet had a chance to do any towing to find out it's torque performance. In my opinion, it is far superior to a TDI but I suppose 6 inline is better than 4. On a side note, the alternator hasn't got a W terminal and I have no Tacho/ rev counter. I'm assuming that, that was standard BMW spec and the tacho was driven in some other way like the ABS system or something. I have the wire in location at the alternator but just don't have anywhere to plug it into. Any suggestions as to how to tackle this problem :-/Oh i see, but we are not talking that sort of modification. Keep things simple. This OP has a RR classic fitted with a M51 and a mechanical VE injection pump. The suggestions based on that seem to have gone some way to solving his problems up to now.
Great. What about famous hot start issue?I agree, but i'am not talking about bigger lift pump, but bigger pump rotor(high presure side - plunger/piston is bigger diameter). It's very common pratcice for bosch VE pump tuners(VAG's etc) to fit bigger head and rotor. More fuel is injected in the same time/one pump plunger stroke.
Stock M51 pump internals are good up to 220hp, with 11mm head someone(in Estonia?) achieved 290hp with big turbo. 12mm is to big, and can sieze at high RPM due to lack of lubrication and fuel cavitation.
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