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Old 07-20-2015, 01:53 PM   #1
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Default 1990 Miata Sequential Injection wiring

This weekend I decided to finally wire my injector harness for sequential injection. I have a DIY MSPNP2 that I bought from 949 Racing for the 1.6 engine. I separated the two pairs of injectors, so I split 1&3 and 2&4. I left injector 1 connected to the yellow wire(2U) on the oem harness and connected injector 2 to the yellow/blk wire(2V) on the oem harness. For injector 3 and 4, I ran two wires to the MSPNP2 DB26 connector. I connected injector 3 to pin 18(injector C output) and injector 4, I connected to pin 26(injector D output). On TunerStudio I went to Basic/Load Settings>Engine and Sequential Settings and changed a few settings. I set the settings to the following:

Squirts Per Engine Cycle: 1
Injector Staging: Simultaneous
Sequential Injection: Sequential/Semi-sequential
Timing Trigger: End of Pulse
Fixed Timing or Table: Use Table
Cranking Injection Timing 1: 360 deg
Injector Drivers: Additional Drivers

The Injector timing table I used was made by comparing and going of a couple different tables I saw posted online and it runs okay. These settings were also setup by comparing to what others had setup in their tune.

I am just wondering if this is the correct way to wire it? injector 3&4 to injC & injD. I mean it works so I would assume yes lol but who knows maybe it just works and it's wrong?

Also, on the MSPNP Gen 2 manual, It shows that there are board jumpers to control what inj C and Inj D drivers do. Specifically jumpers 5,6,7,8. These jumpers let you select how many injectors each driver controls and whether it pairs it to InjA/InjB or allow sequential control via PT6 and PT7.

I'm confused because I didn't change any of these jumpers, but it still works by just switching the above settings in tunerstudio. Can anyone who has done this before or maybe one of you DIY guys help me out with this one. Sorry, I did all my reading prior to doing this, but I'm just kind of stumped.
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Old 07-20-2015, 02:02 PM   #2
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you wanna fire all 4 injectors at once?

and no you didnt wire it correct.

1,3,4,2
a,b,c,d
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Old 07-20-2015, 02:05 PM   #3
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I want to fire them sequentially lol
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Old 07-20-2015, 02:16 PM   #4
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Quote:
Originally Posted by Braineack View Post
you wanna fire all 4 injectors at once?

and no you didnt wire it correct.

1,3,4,2
a,b,c,d
Damn, I had read a previous thread where you mentioned how you would wire. The only reason I wired it the way I did was because the MSPNP2 documentation said:
Cylinder 1 > ecu pin 2U
Cylinder 2 > ecu pin 2V
Cylinder 3 > ecu pin 2Y
Cylinder 4 > ecu pin 2Z

however I don't have a 2Y or 2Z on my wiring harness. apparently these were not used on my year miata. So I ran those to the DB 26 connector.

What your saying though is run cylinder 4 to injC and cylinder 2 to injD. Leaving cylinder 1 on 2U and cylinder 3 on 2V through the oem harness wiring?
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