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Old 03-21-2014, 01:45 AM   #1
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Default 1.6 Switching to 36-1 setup

I am trying to switch over my MS-I Miata to a 36-1 setup.

I installed the OEM Protege wheel that everyone has been using. Since my oil pump does not have the hole for the stock NB Crankshaft Position Sensor, I made a bracket to hold it in place.

I wired the sensor up using the instructions found for FM's wheel that uses the same sensor:
http://www.flyinmiata.com/support/in...ng%20wheel.pdf

Setup Tunerstudio as 36-1
Using Configuring Megasquirt for a DIYAutotune.com trigger wheel
Which had me set
Trig A: 3
Trig A return: 8
Trig B: 21
Trig B return: 26

Went to start it, cranks but nothing happens, no fuel no spark.

Tunerstudio reads no rpm.

Checked my wiring for the sensor, turns out I had power and ground switched. Switched them around and tried it again. Still does not fire but now I saw PW but still no rpm. Did I fry the sensor?

Do I need to modify my MSI? (running standard miata mods)

I did try to run tooth logger and cranked it. Nothing showed up, then I had a few teeth randomly show up (still didn't fire) and then back to no teeth.
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Old 03-21-2014, 11:01 AM   #2
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Can you check the sensor's output with a volt meter while turning the engine with a breaker bar with the key on? It should go from 0 to 12 volts and back again as the teeth pass under it.

Also, can you post a tooth log of an attempted start?
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Old 03-21-2014, 07:26 PM   #3
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It is alternating between 2.5v (no tooth) and 5v (tooth).

Megasquirt wont see any tooth in the log, so the log is literally empty.

Is this signal usable for MS?
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Old 03-22-2014, 09:13 AM   #4
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This is the circuit that I'm using
( disregard the original pull up, that is removed)
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Old 03-25-2014, 01:04 AM   #5
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ok so from doing some extra reading it should be switched to 0v whenever a tooth passes by.

Do I need to use a different size pullup resistor? (using 470ohm currently)
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Old 03-26-2014, 10:59 AM   #6
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Can you check the current when there is a tooth in front of it? When using the opto circuit, you need at least 10 mA to trigger.
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Old 03-28-2014, 12:59 AM   #7
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I switched to a different sensor (2007 Dodge Caliber, $12 at Advance Auto Parts) made a mount and now the car runs. Either the 2 NB sensors I bought/tried are defective or I'm crazy. Anyway, looks I'll be running the Dodge sensor with a custom mount
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