SOLVED - Strange rail pressure bahavior after first WOTs

[marvix]

After start car, no mather if is cold,warm, stoped for 5minutes or....
First 3,4 WOT pulls droped rail pressure.. Then i can 100x WOT and hold min 1800psi... if i dont pull pedal to 100proc, pressure holds everytime. Very disapointing for me... It happens on every map i try, not on stg0 so much (there drop is to 1500psi not to 800 like 18, 19, 20, 21, 22psi boost target maps , MHD OTS, custom)

Car is n54 FBO, custom small hybrids, 3,5bar tmap ..... try to do custom map with tuner

Heres some logs from car remaps process >

stg0 map stock with MHD installed >>

https://datazap.me/u/cr4sh/log-17157...0&data=3-18-19

2x bad pulls then 1800psi and start working well > >

https://datazap.me/u/cr4sh/log-17158...0&data=3-22-23

good pressure 23psi target > >

https://datazap.me/u/cr4sh/log-17158...0&data=3-22-23


what can i try? No vakum leaks, injector index12, car run smooth in both causes, no error codes...

 

[bernardo774]

i have the same issue, but just with high boost target.
3 years ago i run E50, so now the HPFP cant hold 102oct.

but with 15-16psi target, no crash.

sound like need new hpfp

 

[marvix]

i changed hphf and same bahavior,, after engine start,, 3 or 4 pulls spikes low pressure and (hphf crash) then is stable and car run well...
hphf crash only when low pressure spikes lot.. it doesnt matter if car is hot, cold.. it happens everytime after engine start... 3 pulls spikes with full throttle, then ok...

i will try change lpfp sensor to updated bosch and change filter in tank ,,, will see

 

[marvix]

lpfp is wallbro 455 with stock ekpm2,,, i try to change this module to another,, - same bahavior... I ordered ekmp3 and will code voltage fix,, will see..

fuckin gremlin

 

[marvix]

yep.. there is real gremmlin,,, there was hidden parraler ecu conected to DME... maybe from previous owner,, so dropped in first WOT is SOLVED