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Thread: HPFP drop off & vacuum instead of boost when on WOT

  1. #1

    Default HPFP drop off & vacuum instead of boost when on WOT

    Hi- Please help with intermittent HPFP drop offs & vacuum in manifold instead of boost when on full throttle. I have highlighted the HPFP readings in red where the problem occurs. This happened on the track at Eastern Creek at the end of the day. I am unable to replicate the issue on the road. I thought it may of been fuel surge but it did not feel like it. I have experienced fuel surge before but the fuel light was on before. This time I had another 25L left in the tank. It feels like boost cut.
    Any ideas. Could the PCV valve be the culprit ?
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    Last edited by mav2777; 27-05-2014 at 04:08 PM.
    MPS3 Gen 1. CPE CAI,HTP 3"TIP, Koni FSD, Whiteline RSB, Denso ITV22, CPE DP with 100cell hi flow CAT, Cobb AP, Autotek HPFP internals, ETS top mount intercooler, Anti lift kit, JBR REM 88a, EGR delete, Perm Plate/2 catch cans, GTX2860R, 3barMAP sensor, OS Giken LSD,SP63 pistons 9.5:1,Manley H Beam Rods 22.5mm, Clevite Main Bearings+Rod Bearings,ARP2000 Main Studs,ARP L19 Head Studs

  2. #2
    Join Date
    Jun 2009
    Location
    Newcastle
    Posts
    1,413

    Default

    Your realative throttle is at 8% in one cell with app of 99%, forget about what your foot is doing. One of the gurus will be able to help ya. Reading from ifail is a mole but from what I can see maybe your hitting the throttle close limit on map, look in your maps to see what the limit is set at and at what point the throttle is shutting in this log.

  3. #3
    Join Date
    Feb 2012
    Location
    Wollongong
    Posts
    846

    Default

    Fuel pressure should never drop to those levels even at idle. Something wrong for sure, could be your relief valve opening up which is dropping the pressure. Any strange sounds coming from your pump area?

  4. #4

    Default

    No strange noises.

  5. #5

    Default

    I thought I will update my findings on this. The last track day I kept the fuel above half way. Had no issues. So I expect I must of had fuel surge with 25L left in the tank before. HPFP drops were caused by fuel surge, relative throttle closing to protect motor & waste gate duty to O% all to protect motor from HPFP readings below 400. I don't know why I had fuel surge at these levels where as before never experienced till the low fuel light came on.

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