Carrera95

I have a 90-93 mspnp2 for a 1990 miata that i just installed 640cc injectors and modifed the wiring to go sequential. I unpaired the injectors and ran injector 3 to injector C in the options plug and inj 4 to inj D and changed the settings in tunerstudio. The car seems to run fine after adjusting the tables for the new injectors but i read that there are jumpers which need to be changed but im wondering if this is the case or not. Thanks for any help!

Matt Cramer

MSPNPs are normally jumpered for sequential injection from the factory.

Note that the injector outputs run in alphabetical order, so on a Miata firing order, A goes to cylinder 1, B to cylinder 3, etc.

Carrera95

Thanks for the response! When i open the mspnp i dont have any jumpers on the seq pins, is this ready for sequential like that? Also from what i understand i have it wired A to 1, B to 2, C to 3, D to 4 so i need to change that to A to 1, B to 3, C to 2 and D to 4 correct? Thanks for the help

Matt Cramer

Can you post a picture of what you've got with the jumpers? The current default is to build them with sequential jumpers, but it's possible you have something that's been altered or was from a point they were built differently.

Carrera95

I will when i get a chance tonight but i think it might be ok, last time i checked its a v1.5 board if that helps. I changed the injector wiring to match the 1342 firing order and it seems much better now.