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      09-05-2019, 06:47 PM   #80
OzBMR's Avatar

Drives: BMW M140i
Join Date: Aug 2019
Location: Brisbane, Australia

iTrader: (0)

Your log looks really good. I'm running a high boost, low timing setup, peak boost 22PSI then pretty well 20 PSI flat to 6000 RPM, so I'm fuel limited to about E12 and I consistently see HPFP pressures drop to about 1300 PSI, but only between 3800 - 4500 RPM. This is because the HPFP is a lobe based design and at peak torque/Load the RPM limits the pump capacity. At the drag strip where the car is always >5000 RPM I've noticed HPFP stays 2500 PSI+

You should try ramping your Load/boost target up from 5000 RPM, you've got plenty of fuel pressure to play with there.

Originally Posted by Solid67 View Post
Lol nevermind, just went back and looked at some other logs and the lowest its gotten is 1500psi. Seems like I'm starting to get close to the edge.
M140i LCI Mineral Grey
Dorch Stage 2 HPFP, CG Precision DS-1, XHP, MHD Stage 2 HPFP E30 @ E42 100 - 200 6.96s 10.93@127mph
Stock DP, XHP, MHD 95/102 OTS E30 fuel, Hoosier DR2 11.5@121mph about 8.0s 100-200