was wondering if it would be possible for me to install 2 extra injectors in my manifold and just wire them in with the others,with the stock computer.
would the stock v6 ecm be able to drive 8 injectors,and if so any special way id have to wire them in?

 

Just get bigger injectors?

 

i cant do that,ive already got 36#'ers in it now,and im not doing any computer tunning.everything is tuned with a wideband,afpr,and fmu.
right now i have base fp set way low so the car wont idle rich,if i set it anylower the car idles like total **** due to the low fp.i am going to mega squirt over the winter,but i need some sort of bandaid for the time being so i can finish out the race season.i figure if i throw 2 more injectors into the manifold i could sqeeze by with what i have for the next month or 2 till the car comes off the road for the megasquirt install.if not its no big deal ill just have to leave the boost level at 16 psi,but id like to bump it upto 19-21

 

I can't confidently answer your question, but what ecm is it? I'd bet that if you have the 165 ecm it would work to wire an extra injector on each bank. You could get a new/used ecm on standby and blindly test out your idea. Just tap into the wires, hook up the electrical connections to the two injectors without the fuel or anything, and see if anything catches on fire, but you probably already though of that.

Or open up the ecm and get the part number on the injector driver and compare it to V8 ecms and online spec sheets. Planning on making a custom fuel rail for the extra injectors? Seems like more trouble than its worth. Boost is highly addictive, always searching for how you can get somemore.

 

i do have a spare ecm,so im prolly gonna just weld the injector bungs into the manifold,plumb up the new fuel rail and give it a go,figured id see if anyone knew for sure before i tried it

yeah i already have a fuel rail to use,had some extra stock laying around the shop from another project/along with an fpr

 

this may be a dumb question, but i'll ask it anyway.

wouldn't it be easier to rework a second FPR so it works under boost & put it in line with the first FPR, & then have a third FPR Teed into the fuel supply line or the fuel rail to limit max fuel pressure?

 

if im understanding that right,its pretty much what i have,my adjustable fp reg is turned down to 28 psi at idle (stock is 40) then my fmu raises fuel preasure under boost upto 80 psi.its not under boost im having issues atm.the problem is i want to run more boost,but i have the 36# injectors maxed,so i need to step up the injector size,well if i goto a larger injector, i wont be able to lean the motor out enough at part throttle/idle,and it will just load up with fuel.and droping my base fp is not an option cause there wont be enough preasure for the injector to atomize the fuel,so it wont idle for **** then

 

Piggy back two V6 ecus, and run 2 injectors for every cylender, turning off one computer below a certin RPM with a window switch. LOL I have no idea if that would work.

 

daves12secV6, i see.
adding 2 more injectors to inject additional fuel near the front of the intake may work, but how would you set them up so they wouldn't inject during the times you don't need them? maybe a pressure activated switch of some kind on the ground side would work.

 

Couldn't you set up something like a wet nitrous system just without the nitrous to just add more fuel when you need it?

 

For the life of me I can’t figure out why adding 2 injectors is different WRT to idle fueling then going with larger injectors (say if you add 2 36’s you’ll be squirting 48pph worth of fuel per cylinder anyway), but sure, it can be done. Grumpy who posts on the ecm forums and on the turbo buick boards did it with his GN, spraying extra fuel into the plenum to add fuel and to take advantage of some of it’s intercooling effect.

As far as using a nitrous fuel solenoid and a fogger nozzle, that is exactly how BBS originally did it on their turbo kits.

 

well my problem is this since i already have large injectors and a stock ecm the computer can lean out th emotor enough at idle.so going with a larger injector at this point would make that worse.

now if i add 2 injectors and am able to control when they come on,i can get the extra fuel needed to keep my 11.0-1 afr at higher boost levels.i figure a hobbs switch wired into the extra injectors wiring could acomplish this.just set the switch to come on at the boost level were my afr starts to go lean.
shoul dhopefully clear up my problems until i make the megasquirt swap this winter

 

I recall seeing a picture of Willie's twin-turbo IROC a few years back. I believe his TB has three additional injectors in it!


Thats what made me think of it.

 

Probably a Caroll superfueler… I think that Paxton had something similar. Vortech had a similar setup on their truck supercharger system… in all cases they just made a spacer that mounted extra injectors and some external controller.

daves12secV6, the reason that it doesn’t make sense is that you’re going to a lot of effort for something that will have no more control over your mixture then the fuel solenoid + fogger nossle, and probably end up with an inferior fuel distribution…