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Matt Cramer

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Everything posted by Matt Cramer

  1. Matt Cramer
    The *limits* are a band-aid, the correction is not. If you are not having reset issues I'd leave it on.
  2. Matt Cramer
    I see you have Cold Advance enabled, so while that's in effect the timing on the gauge will not match the timing table. Looks like all is well to me.
  3. Matt Cramer
    I suspect it's the cranking pulse width. It is likely it's rich but it could be so lean it misfires. You can go as low as zero, though values below the injector opening time won't do much good.
  4. Matt Cramer
    The fueling can suddenly go rich or lean. Also, they'll show up in a data log, and MegaTune will beep when it's connected and a reset happens.
  5. Matt Cramer
    Oil is pretty much invisible to a VR sensor, unless you've got some serious problems with metal shavings in it. The biggest problem is that you'd likely need a pretty large wheel and small VR sensor, although it's nothing crazy if you have the room on the front of the engine. Putting it in a distributor would be a real headache though.
  6. Matt Cramer
    Could you post an MSQ and a data log? It could be you have some other setting kicking in that affects the timing and moves it away from what's shown in the map.
  7. Matt Cramer
    Sounds like your high temperature cranking pulse widths need to be adjusted, and from your description, they're probably a little bit too rich. This one's an issue with the warm up enrichment - try adding a bit more of it at low temperatures. This may make you have to turn the after start enrichment down by a proportional amount.
  8. Matt Cramer
    Sequential injection would be the big one. There are a couple other features Megasquirt does not currently have that some of the other aftermarket systems offer, but whether this is an issue depends on what your car is going to need.
  9. Matt Cramer
    Trigger offset should fix it except for limp home mode.
  10. Matt Cramer
    If you're using a USB adapter, make sure it's not wiggling in the port. Having it come unplugged can freeze up MegaTune.
  11. Matt Cramer
    C31 and C32 are part of the Megasquirt's VR sensor circuit and only come into play when the MS is reading the crank trigger directly instead of the PIP signal from an EDIS module. The usual symptom of the wrong value there is a drop in the RPM reading.
  12. Matt Cramer
    That message usually shows up when you have MegaTune set to the wrong COM port. It happens when whatever MegaTune is communicating with echos back whatever character it is sent.
  13. Matt Cramer
    The Megasquirted KAs out there so far have all used the optical pick-up in the distributor. I'm not aware of anyone who's used the flywheel sensor.
  14. Matt Cramer
    The 029v and 029y4 codes both have the ability to run six cylinder sequential COP with baro correction, but this would need a cam sensor as well. With just a crank sensor, it sounds like you're on the right track for how to wire it up.
  15. Matt Cramer
    What are you doing for an O2 sensor? It looks like the sensor is either disconnected or you are running pig rich the whole time.
  16. Matt Cramer
    Pretty rare - it could be a sign of corrupted firmware, but it may have been a setting that wasn't burned permanently to the ECU and so it didn't stick when it was powered up again. It should've stuck if you clicked "Burn to ECU" when you set it, though.
  17. Matt Cramer
    Take a data log and post it - this will include a record of your battery voltage and other things the Megasquirt records that will provide good clues. If your voltage wasn't steady enough to control an analog relay, it's definitely not going to be good for digital circuitry.
  18. Matt Cramer
    Yep, you're going to need a tach signal to get an O2 signal. That's just a software peculiarity - they didn't see a need for it to update the O2 reading with the engine stopped, so it doesn't.
  19. Matt Cramer
    That's what it should read - what's it reading with the engine running?
  20. Matt Cramer
    Does LogWorks give you a reasonable AFR reading when you connect directly to the LC-1?
  21. Matt Cramer
    Check the signal on the analog output with a voltmeter. What's it reading?
  22. Matt Cramer
    The Megasquirt doesn't really affect the rest of the wiring, only the wiring for its own inputs and outputs. The relay board just needs power, ground, and a switched 12 volt source to turn it on - these are the only connections with the non-EFI wiring. The rest of it doesn't connect to the MS at all.
  23. Matt Cramer
    Which sort of gauge are you using?
  24. Matt Cramer
    The 12 volt terminals are to power your injectors from. You can run six injectors off one bank and another six off the other. If you only have six injectors I'd split them between the two banks though.
  25. Matt Cramer
    Got a few pictures and more details here: http://madscientistmatt.blogspot.com/2005/12/surge-overkill.html The final installation ended up not using the check valve.
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