Nistune latest update - Knock maps for Z31 now?!?!?!?

  • 300zxturboftw
    300zxturboftw
    Senior Member
    • 3709
    #1

    Nistune latest update - Knock maps for Z31 now?!?!?!?

    Has anyone looked into the update for oct 24 with Nistune? I read the updates and it said it added knock maps for the Z31. I'm assuming those are the Knock Delta compare in the drop down for fuel and timing? I guess the real question is how do we take advantage of this now so the ECU recognizes knock from the sensor past 3000 rpm and in boost.
    Usual Z31 suspect: Garage Queen (aka broken)
  • G-E
    G-E
    Junior Member
    • 6320
    #2
    The ecu and sensor are not terribly good at distinguishing noise from knock at high rpm, hence the cutoff
  • 300zxturboftw
    300zxturboftw
    Senior Member
    • 3709
    #3
    Could get a standalone sensor to wire into the ecu to feed knock signal
    Usual Z31 suspect: Garage Queen (aka broken)
  • G-E
    G-E
    Junior Member
    • 6320
    #4
    Any aftermarket/standalone knock sensor system with a calibrated output might still not tickle the z31 hardware properly… you'd have to ask matt about how it decides it's knock and what device would trigger it
  • Axel kain
    Axel kain
    Moderator
    • 1221
    #5
    plus the oem sensor location is horrible!
    Damn dirty angels....these cars!

    Current Daily Driver - 86 Turbo.
    Under the cover - THE BANANA… that needs to be re-energized.
    sigpic
  • G-E
    G-E
    Junior Member
    • 6320
    #6
    Axel kain;n763273 wrote: plus the oem sensor location is horrible!
    The knock sensor is a piezo, it just makes signal based on vibration, short of producing too little voltage, I don't see how a piezo can be horrible
  • Axel kain
    Axel kain
    Moderator
    • 1221
    #7
    I didnt say knock sensor design was a bad idea, I said, the stock location is bad, for getting any consistent and unbiased pickup. if it were in the intake galley, or with another on the drivers side, sure.

    reading comprehension, please practice.
    Damn dirty angels....these cars!

    Current Daily Driver - 86 Turbo.
    Under the cover - THE BANANA… that needs to be re-energized.
    sigpic
  • G-E
    G-E
    Junior Member
    • 6320
    #8
    Simplistically, you're not likely to knock on only one side, but going by the ecu-engine cycle, cylinder #3 is the one most likely to be lean below 3000 rpm, which is exactly where it is, and exactly when it operates

    Being on the head would be fine if your valvetrain was quiet, being in the galley wouldn't improve things over being on the outside, and being too close to the top of the block is difficult with the oil/water/stud passages surrounding the cylinders