20-02-2013, 12:40 PM
The most interesting part that I can see is that the CP3 pumps do seem to work slightly differently than the CP1 pumps - however whether the regulation side works the same I do not know...
The CP3 has a system kinda like the Bosch VE pumps, they have a gear driven pump inside the pump also that supplies the radial piston pumps inside with fuel:
![[Image: CP3flowchart.GIF]](http://www.relentlessdiesel.com/media/fprmods/CP3flowchart.GIF)
Notice that the regulator on these controls the flow rate *BEFORE* the piston pumps... Does the CP1 control the pressure AFTER the piston pumps?
Where my question and maybe confusion lies is that on some CP1 based systems, they have the regulator built into the rail, so does this mean as a general rule that the CP1 is regulated after the pump, or before the pump? If it's the same system as the CP3, then we should be good to go, from my research the regulator is VERY similar to the CP1 regulator, which makes me think that probably the regulation side of it is probably the same, from the pictures I can see of CP1s, I cannot tell if they are the same.
A big CP3 pump would be absolutely CHRONIC in my honest opinion, you'd literally have NO problems with any fuel flow. The tables controlling duty cycle will have to be changed for certain, whether the PID control values will have to be changed for the ECU to be able to control over and undershoot when the IQ changes, I do not know... However every company manufacturing Diesels now seems to have gone straight towards CP3s.
The CP3 has a system kinda like the Bosch VE pumps, they have a gear driven pump inside the pump also that supplies the radial piston pumps inside with fuel:
Notice that the regulator on these controls the flow rate *BEFORE* the piston pumps... Does the CP1 control the pressure AFTER the piston pumps?
Where my question and maybe confusion lies is that on some CP1 based systems, they have the regulator built into the rail, so does this mean as a general rule that the CP1 is regulated after the pump, or before the pump? If it's the same system as the CP3, then we should be good to go, from my research the regulator is VERY similar to the CP1 regulator, which makes me think that probably the regulation side of it is probably the same, from the pictures I can see of CP1s, I cannot tell if they are the same.
A big CP3 pump would be absolutely CHRONIC in my honest opinion, you'd literally have NO problems with any fuel flow. The tables controlling duty cycle will have to be changed for certain, whether the PID control values will have to be changed for the ECU to be able to control over and undershoot when the IQ changes, I do not know... However every company manufacturing Diesels now seems to have gone straight towards CP3s.
