The big problem with running big injectors/ pressure on a tbi is the fuel control at idle, right?
It's already into async at that point (batch fire every 12.5ms) and if your duty cycle gets too small you can't accurately meter. (yes? no?)
So what if you were to run a single plane and disable an injector, alternating injectors every so many firings? That'd force you to double the duty cycle to the enabled injector, giving you more leeway.
Assuming it can be implemented....should I just go take a nap?

 

I see where you are getting at and I would not try it. I would just use the right injectors until you can tube for larger ones. It is much easier.

 

I think what he means shifty is that assuming he needs the larger injectors for the power he's making, how would you get the fuel control you need for idle. So if you need the big injecotrs for the top end then what you described would work great, the only problem being you would have to dive into code to make it work. I'm really close to taking the plunge when ever I can get some litterature on how to do this from one of my teachers and the time to pull my hair out over it.

I'm currently running 75 pph injecots at 23 psi which if the forumula is correct is aobut 110 PPH per injector. I'm only making about 300 hp at the flywheel and have no problem with idle other than the cam that I have throws the O2 for loops and I have to run open loop. I still have room to move up in PW before going static, but I am about as small as I can go at idle. I have a little room to play but not much. For the most part you won't have problems with this unless your running forced induction.

 

Oh ok...I see where you are getting at. Well in that case I am not good enough at tuning yet to make that call.

 

will it work? yes.

can it work by modding the ECM code on the prom? i dont know.


theres always the simpler solution of running more injectors and making them smaller....

 

Not so simple
We're stuck with two injectors unless you're talking going to a dual TBI setup.

After some research I am certain this could be implemented in code. An alternative would be to intercept and modify the drive signal, but I'd rather not.
This'd be the first time I can think of where a single plane was used as part of a solution to improve idle quality

The real problems (as I see 'em) would be fuel falling out of suspension due to low velocity and charge stealing. In short, single plane distribution problems.

 

the injector driver is capable of running multiple high impedence injectors...................