Fuel

Discussion in 'Non Technical' started by beaver, Apr 26, 2018.

  1. beaver

    beaver southern zeds

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    Filled up with bp ultimate this morning(the station is close by and has a big turnover) had about half a tank of shell vpower(nearest station is a 40k round trip away) left in it at the time,headed out for a nice quite drive to the upper yarra dam, about a 70k round trip. During week days this road is very quite, anyway at around 5k rpm in third and 15psi I hear detonation, not bad, but not good either. At first I thought the BC solenoid valve had started to cycle early instead of at 18psi, it makes a racket when its bleeding air, which sounds a little like detonation. So I turn the controller of, actuators are set to open at 14psi, at 5k rpm on flat road in second detonation again, and also detonating in third at the same rpm. I'm starting to think vacuum leak, regulator, low fuel pressure, checked this out when I arrived home, Idle is stable at 750, cant hear any air leaks,fuel pressure is good at idle, and doesn't leak down quickly. Up shot is I poor some nulon octane booster in and no more detonation. The only thing other than some mechanical, vacuum, fuel issue, timing is @15deg solid, that I haven't uncovered, is the fuel I put in it this morning. Tell me vpower is the way to go, and ultimate is rubbish.
    Your thoughts.. experiences.. please!
     
  2. MagicMike

    MagicMike Moderator Staff Member

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    You didn't grab the wrong pump? :D E10 91 is no good haha

    If you can hear the det that's pretty severe!
     
  3. beaver

    beaver southern zeds

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    No mate not the wrong pump, I can hear it.. really pissing me off..
     
  4. beaver

    beaver southern zeds

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    I,ve also relocated the det sensor to the back bolt on the plenum firewall end. When the new engine went in the det sensor was replaced with a new one in the stock possi it was faulty right from the start . I don't have any codes atm, but that could be because sensor is not as sensitive at the new location.
     
  5. rob260

    rob260 Moderator Staff Member

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    Codes don’t indicate that the sensor has detected detonation, only that the sensor itself is faulty. So no codes only means that the ECU has not detected a sensor a fault, not that the ECU has not detected knocking.
     
  6. beaver

    beaver southern zeds

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    Yes I know mate, I should have said, not sensitive enough to trip the ecu, into retarding the timing and adding fuel. Safety mode.
     
  7. rob260

    rob260 Moderator Staff Member

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    Ah ok totally misunderstood you.

    Yeah I wouldn’t really expect it to work on the top of the plenum, I don’t know why people advocate that... at least your ears did the job!
     
  8. Shane001

    Shane001 Well-Known Member

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    Depends what state you're in, in Sydney it's generally considered the opposite.
     

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