So my LPFP is toast and can't even hold "normal" boost pressures anymore.
I went ahead and got a new CL version OEM pump since it seems it is a "malfunction"
issue rather than a "insufficient volume" issue, and i'll have to see how it does from there.
So the question is what are the options besides the USP solution which i don't really like?
I've seen some individual tries but all seem to run into issues.One is the "starvation issue"
which i don't really comprehend.What is the difference between the OEM pump and the
aftermarket ones that make them starve of fuel ?I mean most are replacing the "core pump"
and not the whole basket so why is there a problem ??Anyone got any schematics that might
be of help ?
I really can't understand how there hasn't been a serious aftermarket LPFP all of this time.
I know we have a returnless fuel system and that the pump is volume controlled by the ECU
but SOMEONE of those big companies should be able to make a pump work the same way and
provide increased volume !!!!
Oh and another thing...If you find your injection duty has gone up lately, better check the
LPFP.Up to now i was under the impression a bad LPFP would normally starve the HPFP and
drop rail pressure but that is NOT the case (at least with a low performing pump like mine was).
Instead the ECU increases injection time to provide the extra fuel but that reaches an end point and
then the problem starts (and it also stresses the injectors).The issue seems to be worse with the S3 injectors that provide less flow in the same rail pressures, so you should be extra careful if using those....