AlpineRAM

The standard high pressure pumps for common rail diesels are dimensioned to supply just enough fuel per revolution to go WOT ( in the strongest version of the engine) <br>I feel that the key in common rails will be an increase in volumetric capacity (like taking the high pressure pump from the next bigger engine) and an increase in flow rate of the injector and maybe rail pressure. Just modifying pulse width is not good enough because you loose the timing of the burn.<br><br>Just my 2c<br><br>AlpineRAM

HOHN

I agree. I still think the common rail system will rule the roost VERY soon. It's just going to be a little more $$$ to get there!<br><br>Will we soon see entire common rail fuel system retrofits available from TST, DD and EDGE and the likes?? One can hope.<br><br>Hohn

Don M

Alpine is dead on. The common rail pumps we have are getting close to tapped. Pulse width is great to extend some but you can drop out of the efficiency curve of when to inject the fuel. The poor little rail is kinda small too.<br><br>New rails and a new pump would be great.<br><br>Don~<br>

StakeMan

If you change the pump then its not the same. Thats like saying the VP44 is the greatest after you changed over to a p-pump.<br><br>At what point will the &quot;stock pump&quot; not make more HP without burning up.

AlpineRAM

Stake- one of the charming facts about common rails is that you can swap the high pressure pump easily. The stock high pressure pump will not burn up- it's just the pop off valve being shut 100% of time. The boxes for the 03 do modify the rail pressure signal (comparable to a boost fooler) and could potentially lead to pump failures. Now we are talking about not enough volume- meaning pressure would drop because we inject more than the pump can deliver- the pump would actually relax a bit ;D
Actually the common rail separates the generation of pressure from the measuring and timing of delivery. So just changing the high pressure pump to keep up with the demand of higher flowing injectors while keeping the pulse width and timing will increase power output and not change the system significantly. A viable way would be to increase flange width of the hp pump. Then you would have to fool the blow off valve that controls rail pressure and use higher flowing injectors.

Just pondering on how I'd do it...

AlpineRAM