ITT: VVTuner "piggyback" wiring for stock (or nonMS) ECU - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-28-2014, 01:35 AM   #21
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I've none, but I'd love to see exactly what you did and how you got it to work.
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Old 10-29-2014, 02:00 PM   #22
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we are doing this conversion also, will the stock 99 ecu handle the camshaft sensor moving through the vvt movement? just trying to get it to run with the VVT tuner.
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Old 10-30-2014, 12:58 AM   #23
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To get the vvt motor to run on the 99 stock ecu with vvtuner you need to do the following.



-VVTuner Pin 8-15 to OCV (Polarity no care)
-VVtuner Pin 7 to 12v hot that's hot while cranking (hook it up to room while testing to rule out using the a 12v source that's not hot while cranking)
-VVtuner 9-14 to ground
-T off the cam/crank sensors (Grey with red and Grey with blue) that are going into the DB-37 connector to the ECU and send them to the cam/crank inputs on the vvtuner. You cannot hook the system up in pass through. Go into the VVtuner via Serial and disable pass-through mode.

I think that's it. The only thing I'm not 100% sure on is the ground. I don't remember if I grounded both 9/14 but i'm reasonably sure I did.

Re posting this below image brain originally posted earlier in this thread for ecu pinout info. This diagram shows you hooking it up with the stock ECU in pass through, that does not work. However the other info in this image is helpful.
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ITT: VVTuner "piggyback" wiring for stock (or nonMS) ECU-vvtuner%2520db15%2520pins%2520no%2520shields.png  
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Old 11-13-2014, 05:16 PM   #24
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Quote:
Originally Posted by EErockMiata View Post
To get the vvt motor to run on the 99 stock ecu with vvtuner you need to do the following.



-VVTuner Pin 8-15 to OCV (Polarity no care)
-VVtuner Pin 7 to 12v hot that's hot while cranking (hook it up to room while testing to rule out using the a 12v source that's not hot while cranking)
-VVtuner 9-14 to ground
-T off the cam/crank sensors (Grey with red and Grey with blue) that are going into the DB-37 connector to the ECU and send them to the cam/crank inputs on the vvtuner. You cannot hook the system up in pass through. Go into the VVtuner via Serial and disable pass-through mode.

I think that's it. The only thing I'm not 100% sure on is the ground. I don't remember if I grounded both 9/14 but i'm reasonably sure I did.

Re posting this below image brain originally posted earlier in this thread for ecu pinout info. This diagram shows you hooking it up with the stock ECU in pass through, that does not work. However the other info in this image is helpful.

this post was what I was looking for. when we wired it up as shown it started on the first try an the VVT tuner worked.
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