Injector Wiring

[T_Dub]

It seems that my injectors for cylinders 1&4 and 2&3 have to be wired together, but wont this make my engine use twice as much fuel as it needs, if my firing order is 1-2-4-3? Doesn't this mean that when 1 fires at the right time, 4 fires when its on its exhaust stroke, because they're wired together?

[FiatFreak]

Yup, that is the way it works. You do have them wired correctly btw. Even though one of the injectors is always squirting at a closed valve, the gas doesn't go away. It stays in the intake runner and gets sucked in on the next intake stroke. The X-Tau accel enrichment works on the concept that some of the fuel in the intake stays as a liquid on the walls and the back side of the valve. As the valve opens, the drop in pressure vaporizes some of that fuel.

On a 4-cyl, you should try running 4 squirts alternating, or 4 squirts simultaneous if you can do it without getting a req fuel that is too low. Doing so will help to improve your idle.

-Patrick-

[T_Dub]

OK, thanks, i just wanted to make sure.

And what do you mean, just try the different settings, and see which one works better?

[FiatFreak]

If you haven't done a lot of tuning work yet, then yes, I would try the different settings. If you have a fully tuned VE map with your current injector settings, and you are happy with your idle, then I wouldn't bother. Changing these injector settings will also require a change to the Req_Fuel and to the VE map. I'd only do it if my idle was crappy or if I was just starting out in the tuning process.

-Patrick-

[T_Dub]

OK, thanks, yeah i haven't started much tuning yet, gotta get my VE map straightened out, thanks for all the advice!