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94-95 Megasquirt on 96 Miata

 
Old 08-20-2018, 12:06 AM
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Default 94-95 Megasquirt on 96 Miata

Sorry if this has already been asked, I've tried searching and couldn't really find a clear answer

So I ended up getting a really good deal on a bunch of turbo parts, and I got a Megasquirt PnP 2, however it came out of a 94 Miata. I have a 96, so mine is OBD2, and from what I can tell, the OBD1 and OBD2 NA Miatas have a different ECU harness. So what I'm wondering is would it be possible to just modify the harness and run the OBD1 megasquirt, or would I have to get a whole new ECU?

Also any write-ups or information on how to modify the harness (if possible) would be great
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Old 08-21-2018, 02:35 PM
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This question (X year PNP into Y year chassis) has been asked here many times. It is theoretically possible, but it is also a bad idea. You will be much better off selling what you have and buying the proper PNP box for the chassis you have. Modifying an stock harness is just asking for trouble.
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Old 08-21-2018, 03:06 PM
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Originally Posted by MetalMuffins View Post
This question (X year PNP into Y year chassis) has been asked here many times. It is theoretically possible, but it is also a bad idea. You will be much better off selling what you have and buying the proper PNP box for the chassis you have. Modifying an stock harness is just asking for trouble.
Mod parent up. 90-93 to 94-95 is doable, 90-95 to 96-97 is a lot more involved and there's always the possibility of destroying the ECU in the process just by making a mistake on a single wire.
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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 08-21-2018, 09:45 PM
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Alright, sounds like I'll have to sell/trade it for a 96-97 ecu
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