Going from Batch to sequential injection on a 92 miata with MSPNP Gen 2
#1
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Is going from batch injection to sequential injection as simple as running a single wire from the 2nd injector and another single wire from 4th injector, and connecting the first new wire to pin 8 and the second new wire to pin 9 on the MSPNPs additional harness. Then enabling sequential injection in the correct places in TunerStudio?
I'm asking because I found a lot of info about going to sequential injection, but nothing that was specific enough that I felt comfortable cutting wires on my harness before being sure.
I'm asking because I found a lot of info about going to sequential injection, but nothing that was specific enough that I felt comfortable cutting wires on my harness before being sure.
#2
Boost Czar
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you need un-pair your injector harness.
then you need to run two wires to INJ C and INJ D outputs.
you wire INJ C to cly4, and INJ D to cly2.
INJA and INJB should be wired to the OEM harness at cly1 and cly3 respectively.
then change untimed injection (or semi-seq.) to fully seq.
you'll have to retune fuel.
then you need to run two wires to INJ C and INJ D outputs.
you wire INJ C to cly4, and INJ D to cly2.
INJA and INJB should be wired to the OEM harness at cly1 and cly3 respectively.
then change untimed injection (or semi-seq.) to fully seq.
you'll have to retune fuel.
#4
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I never got an exact answer myself when I did this, but I wired mine a bit different and it still seems to work.
I wired cylinder 1 and 2 through the oem harness and I wired cylinder 3 and 4 to the mspnp gen db26 connector. then change the settings to sequential/semi- sequential in tunerstudio.
I don't know why wiring like this still works good. It idles smoother than when I was running Batch inj. sooooo yeah that's my input![Dunno](https://www.miataturbo.net/images/smilies/dunno.gif)
Also in the mspnp2 documentation it talks about specific jumpers on the board that will control what injector and how many injectors each channel can control. I didn't move any jumpers and it still works.
I wired cylinder 1 and 2 through the oem harness and I wired cylinder 3 and 4 to the mspnp gen db26 connector. then change the settings to sequential/semi- sequential in tunerstudio.
I don't know why wiring like this still works good. It idles smoother than when I was running Batch inj. sooooo yeah that's my input
![Dunno](https://www.miataturbo.net/images/smilies/dunno.gif)
Also in the mspnp2 documentation it talks about specific jumpers on the board that will control what injector and how many injectors each channel can control. I didn't move any jumpers and it still works.
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#5
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Are these the correct pins for the MSPNP Gen 2 with 1.2 mainboard
pin 6 - CANBus high :: CANH = INJ C
pin 7 - CANBus low :: CANL = INJ D
I believe with the 1.3 main board INJ C is pin 18 and INJ D is pin 26. But I'm not seeing the same details for the 1.2 main board.
pin 6 - CANBus high :: CANH = INJ C
pin 7 - CANBus low :: CANL = INJ D
I believe with the 1.3 main board INJ C is pin 18 and INJ D is pin 26. But I'm not seeing the same details for the 1.2 main board.
Last edited by apariah; 07-30-2015 at 02:44 AM.
#8
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Does anyone know the pins used for the miata 90-93 harness? Per the suggestion from diy I tried sourcing one through a salvage yard. They quoted me 95.00 for a connector with 6" of wire coming off of it. And the local dealer said mazda does not stock or even specify the pins they only sell the complete harness.
#12
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Funny enough once I got the pins out, I noticed I had two of them sitting beside my desk from the weather pack connector I used for some stuff awhile back.
I got them installed last night, and the car wouldn't start. I'm about to reload my tune and try it again.
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