cpt_gloval

iTrader: (1)

i'm cross-posting this into the 2nd gen section since it has more to do with FC mechanics than FB style.

so i'm putting an s4 engine into my gsl-se and will be using the gsl-se single stage injection. i was told to just plug the secondary injector locations and it will run fine.

now my quetion is, assuming i wire the aux ports open, can i run my single-stage injection system on the S4's secondary fuel rail? it seems like using the secondary location would have a clear access advantage when/if i send the injectors off to be cleaned.

has anyone, perhaps for simplicity's sake, run single stage injection on the secondary fuel rail? looking for input, ideas, theory, whatever.

thanks fellas

Aaron Cake

iTrader: (1)

Having the injectors closer to the intake ports offers better throttle response, which is why Mazda has placed the primary injectors on the middle iron.

Putting the injectors farther from the port increase atomization.

So Mazda decided to get the best of both worlds: primary injectors up until 3800 for crisp low end, then phase in the secondaries once the air really starts to flow.

Ideally, you would use this setup.

But just running secondaries should be fine. You may or may not notice the slight lag in throttle.

cpt_gloval

iTrader: (1)

ok so it will run fine, you say. i think it'd be worth a try this way. if i notice poor throttle response, i can always move the injectors.

the car is just going to be a track car and mountain runner, so i'm not really that worried about road manners below 4000rpm.

Aaron Cake

iTrader: (1)

Then it will likely be just fine.