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Supermiata 36-2 trigger wheel sync issue

 
Old 09-23-2018, 05:31 PM
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Default Supermiata 36-2 trigger wheel sync issue

Just took my recent VVT swap to a tuning shop and they are noticing frequent enough sync issues. We suspect and issue with crank sensor and the 36-2 trigger wheel. It is a brand new sensor from Mazda so I don't believe the sensor it the issue. I set the gap by using a credit card. My wiring job was not the best in that many of my wires were too long so I coiled them up and zipped tied them. They at least were going to cut the wires down to proper size and insulate them all a bit better to make sure there isn't an interference issue. I wanted to see if people on here had other ideas of fixes to try. ECU is the MSLabs MS3 basic. Power numbers are spot on even given the sync issue so that is the good news at least!
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Old 09-23-2018, 05:46 PM
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Are you using just the crank sensor (ie running batch fire injection and wasted spark ignition) or are you also using the stock cam sensor? Assuming NB1/NB2.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
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Old 09-23-2018, 05:54 PM
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It is a VVT motor in a 94 chassis. I did the wiring talked about in vvt swap thread where you split the orginal NA sensor to the NB cam and crank sensors. I hope that answers your question.
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Old 09-23-2018, 06:25 PM
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Were you already running the stock 4T wheel before without issues?
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 09-23-2018, 06:30 PM
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Brand new engine and had the 36-2 installed on it during build. Previously car had the orginal engine in it.
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Old 09-23-2018, 06:52 PM
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I had an similar issue when my ignition input capture was on rising edge. Totally fixed it with the falling edge setting
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Old 09-23-2018, 07:00 PM
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Originally Posted by germanmiata View Post
I had an similar issue when my ignition input capture was on rising edge. Totally fixed it with the falling edge setting
Did you just change that setting to fix or more? I see a warning about this must match your tach input. Mine is also set to rising currently.
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Old 09-23-2018, 08:16 PM
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You need to get the sensor just about kissing the wheel, so make sure it's wicked close.
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Old 09-24-2018, 03:46 AM
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If your ECU was brand new and originally set for the 4G63 (ie NA CAS) mode, then you need to change your ignition input capture.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 09-24-2018, 06:01 AM
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Originally Posted by Reverant View Post
If your ECU was brand new and originally set for the 4G63 (ie NA CAS) mode, then you need to change your ignition input capture.
​​​​​​
​​​​​I already have spark mode set to Miata 36-2. Could you tell me what settings for rest of ignition options?

The ECU is one I bought direct from you a few years ago.
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Old 09-24-2018, 06:13 AM
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Other ignition settings I have are.
skip pulses - 3
Input capture - rising edge
Spark output - going high
Number of could - wasted spark
Spark hardware - ms3x spark
Cam input - js10
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Old 09-24-2018, 06:54 AM
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Also to clarify, it isn't constant sync issues. But enough to cause the ECU to fire a check engine.
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Old 09-24-2018, 01:42 PM
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Serial number of the ECU please.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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