07-20-2015, 12:53 PM
Join Date: Dec 2014
Location: Salinas, CA
Total Cats: 2
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.