As I have read on here, the TDI VE is an electronic version of the Cummins 4bt VE. In fact, on older engines, the only difference I have seem to have found is the shaft size (IIRC, the VW VE is 15mm, the Cummins is 20mm). So for sake of argument, lets say they are mostly the same. The reason for this thread is to find out WHY the fuel inlet pressure are lower on the VW vs the Cummins VE.
I will quantify this with me having a 1993 Cummins 6bt. I have a Walbro 392 HPFP with a Mallory 4307M regulator set at 16psi pre-filter. Through the filter was close to 12psi when checked by a banjo bolt. I have friends pushing more than 17psi inlet on the 6bt and the seals are holding fine. In fact, we notice more top end fueling and less smoke in the higher RPM range.
So how does the VW VE differ from the Cummins VE?
I will quantify this with me having a 1993 Cummins 6bt. I have a Walbro 392 HPFP with a Mallory 4307M regulator set at 16psi pre-filter. Through the filter was close to 12psi when checked by a banjo bolt. I have friends pushing more than 17psi inlet on the 6bt and the seals are holding fine. In fact, we notice more top end fueling and less smoke in the higher RPM range.
So how does the VW VE differ from the Cummins VE?