The Definitive "VVT swap into 90-97 chassis" Megathread. - Page 29 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-25-2018, 05:44 PM   #561  
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Am I doing this correctly?
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Old 04-25-2018, 05:46 PM   #562  
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doing what correctly?

Nevermind picture hadn't uploaded yet I guess. I have no idea though, I just bought the DIY MS3 pnp pro
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Old 04-26-2018, 09:56 AM   #563  
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Sorry, that wasn't meant to be cryptic. Posted at work and meant to edit got sidetracked and forgot. I'm VVT swapping my 95, did I get all I need to build a MS3 properly?
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Old 04-26-2018, 10:23 AM   #564  
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Go to trubokitty.com
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Old 04-26-2018, 10:43 AM   #565  
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Go to trubokitty.com
That's where that list was compiled from, just looking for verbal confirmation past that.
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Old 05-16-2018, 03:44 PM   #566  
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Has anyone wired up a NB alternator to an ms3 successfully yet?
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Old 06-11-2018, 11:53 AM   #567  
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I got my swap done, fired up right away and idled well on the MS3Basic basemap. I drove the car around on Saturday to rough in a VE table and Autocrossed the car on Sunday in the pooring rain without hiccup. The only pending issue I have currently is my tach still does not work. I wired the ignitor wires blk/wht and yel/blue together. There is a 1k ohm resistor in the Diag box from when I had COPs on the car as a 1.6 between -IG and +B. Having thread thru this thread multiple times I am still a bit confused on what I need to do to get the tach working again. Here are the 3 common trends I see in this thread about getting the tach back

1) wire Black/White and Yellow/Blue together at the ignitor harness - this redirects the tach back to the cluster
2) wire the Tach output pin on the ECU options plug to the Black/White wire on the stock ECU harness
3) wire the Tach output pin on the ECU options plug directly to the Yellow/Blue wire on the cluster harness plug

There was a bit of discussion around this, but no body seemed to verify what worked and what did not.
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Old 06-11-2018, 01:09 PM   #568  
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It depends on the year of the chassis (i.e. the wiring) and which coils you are using. You have VVT coils with no tach output, so you need to use the ECU to drive your tach. There are probably OEM wires which already run from the ECU area to the cluster, so just figure out which wire to connect the tach output to, and then configure the tach output appropriately.
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Old 06-11-2018, 01:55 PM   #569  
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So on my 1991 Federal car, it appears I would need to wire the Tach Output from the MS3 Basic to ECU pin 2I which is the yellow/blue wire for Igniter Terminal E. I am curious why this is not done internally in the MS3 and requires and external wire run to solve.
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Old 06-11-2018, 01:58 PM   #570  
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Quote:
Originally Posted by hedz0r View Post
So on my 1991 Federal car, it appears I would need to wire the Tach Output from the MS3 Basic to ECU pin 2I which is the yellow/blue wire for Igniter Terminal E. I am curious why this is not done internally in the MS3 and requires and external wire run to solve.
cause, even when you wire it to 2I, you still need to physically splice together the B/W wire from 2I going to the igniter to the Yel/Blu wire coming out of the igniter that goes back to the dash tach.

I prewire my 90-94 units this way in case someone upgrades...
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Old 06-11-2018, 02:08 PM   #571  
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cause, even when you wire it to 2I, you still need to physically splice together the B/W wire from 2I going to the igniter to the Yel/Blu wire coming out of the igniter that goes back to the dash tach.

I prewire my 90-94 units this way in case someone upgrades...
This makes sense, thanks for the clarification.
So wiring Tach output from the MS3 to 2I on the ECU connection will bring my tach back.
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Old 06-11-2018, 03:16 PM   #572  
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only if you then connect 2I to the tach...

2I only connects the ECU to the ignitor connector.
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Old 06-11-2018, 05:53 PM   #573  
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So I wired pin10 on the DB37 connector, which is yel/grn to 2I on the 91 ECU harness which is yel/blu and got a no start which is odd to me. Guess I'll just run pin10 to the cluster itself
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Old 06-12-2018, 10:11 AM   #574  
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what coils are you even running right now? why did you remove the COPs?
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Old 06-12-2018, 10:39 AM   #575  
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stock 01 VVT coil near plug. Toyota COPs came off because they did not fit in the valve cover without significant trimming and no options for a mounting plate. I ran a wire from the ECU Tach out to the cluster and wired it to the white plug pin H which us yel/blu and I got the tach back.
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Old 06-17-2018, 09:28 PM   #576  
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Just want to confirm NB Crank sensor wiring positions from the sensor to harness connector.

On the crank sensor connector - The red is for 12v power, blue is signal and black is the ground. The equivalent harness side connector would be matched with wh/red 12v, grey/red for signal and black blue for ground. Thanks.
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