[kern417]

"HPFP Crashing" is becoming a trigger word for B58 owners but luckily it's something that can be identified in logs and is typically fixed pretty easily. Check out the video for the lowdown.

[blacksapphire440i]

Does anyone know how much boost stage 2+ OTS maps usually run? Both MHD and bm3?

[kern417]

Originally Posted by blacksapphire440i

Does anyone know how much boost stage 2+ OTS maps usually run? Both MHD and bm3?

https://f30.bimmerpost.com/forums/sh...3#post25202063

[blacksapphire440i]

Originally Posted by kern417

https://f30.bimmerpost.com/forums/sh...3#post25202063

Appreciate it! thanks!

[sultan340]

Originally Posted by kern417

https://f30.bimmerpost.com/forums/sh...3#post25202063

Thanks for the clarifications in the video, great content as usual. I managed to get rid of the dip with a stage 1 dorch hpfp upgrade, but what I understand is we'll have to make some map adjustments to get the boost related deviation right.

[kriszty]

nice explained...

[T_H_O_M_A_S]

what do you mean by saying the sensor doesnt actually control anything ?

[eluded]

Originally Posted by blacksapphire440i

Does anyone know how much boost stage 2+ OTS maps usually run? Both MHD and bm3?

I think it's 19 pounds, stage one is 17.2 psi

[kern417]

Originally Posted by sultan340

Thanks for the clarifications in the video, great content as usual. I managed to get rid of the dip with a stage 1 dorch hpfp upgrade, but what I understand is we'll have to make some map adjustments to get the boost related deviation right.

yes you should always try to optimize boost control for the best performance and safety

Originally Posted by T_H_O_M_A_S

what do you mean by saying the sensor doesnt actually control anything ?

it's a monitor for the hpfp piston travel. it doesn't control pressure or flow.

[T_H_O_M_A_S]

the travel of the piston is fixed by the cam lobe .
the electrical connection to the hpfp is actually a fuel quantity valve .
if its just a monitor , how is pressure regulated within the rail ?

[kern417]

Originally Posted by T_H_O_M_A_S

the travel of the piston is fixed by the cam lobe .
the electrical connection to the hpfp is actually a fuel quantity valve .
if its just a monitor , how is pressure regulated within the rail ?

Guess I should specify it's correlating the piston stroke with fuel supply. The pressure sensor is on the rail. #2 on the diagram




Edit: Ok I'm seeing what you're referring too. What I was trying to clarify was that people thought it was the fuel pressure sensor and that's not the case. I'll add some clarification to the video.

[T_H_O_M_A_S]

to me its still a closed loop
with the pressure sensor reading the pressure
and the dme controlling the valve on the hpfp
trying to maintain the required pressure in the tune .

whenever your see dips in your logs logs , the valve is at duty cycle 100
and no more fuel can be supplied to the rail in order to maintain the pressure
therefore you will need an upgraded hpfp with a bigger piston .

[kern417]

right, and my understanding was that it is monitoring flow not controlling flow. so i'll need to add some clarification in the video

[kern417]

Originally Posted by T_H_O_M_A_S

to me its still a closed loop
with the pressure sensor reading the pressure
and the dme controlling the valve on the hpfp
trying to maintain the required pressure in the tune .

whenever your see dips in your logs logs , the valve is at duty cycle 100
and no more fuel can be supplied to the rail in order to maintain the pressure
therefore you will need an upgraded hpfp with a bigger piston .

I made a new video to clarify things