Forums/Z31P/z31-performance-upgrade-forums engine-management/Nistune latest update - Knock maps for Z31 now?!?!?!?
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300zxturboftw: (2013-11-06 21:47:19)
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.
G-E: (2013-11-06 22:53:38)
The ecu and sensor are not terribly good at distinguishing noise from knock at high rpm, hence the cutoff
300zxturboftw: (2013-11-07 03:26:55)
Could get a standalone sensor to wire into the ecu to feed knock signal
G-E: (2013-11-07 05:39:20)
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: (2013-11-09 15:11:40)
plus the oem sensor location is horrible!
G-E: (2013-11-09 22:05:49)
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: (2013-11-10 03:48:56)
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.
G-E: (2013-11-10 04:02:28)
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