Thread: Dual injectors per cylinder?

Originally Posted by Turbo1dr

That's how you could have it to work but making it switch automatically works even better. My other car with this set-up actually switches automatically to the high octane every time you get into boost. No manual switching at all....just nail the throttle and after a certain boost level it switches to 116 octane and then when you let off the throttle it switches back to 87. It's seamless...

Here is the diagram of how I've got it wired on my Grand National engined Malibu. I made a custom injector wiring harness that just plugs into the main harness....the computer doesn't even know it's switching.

hi i have done a similare setup on my srt-4

and have a small problem if both set of injector are connected the car die when in boost
my pcm ground the negative side of the injector... even if i leave the positive side of the other injector floating it happens
if i disconnect from the injector it's ok

i haven't put any diode like you did, i just don't see where the feed back would come...but hey if it solve the issue who care

ps i work in electricity so you can be complexe in that side

Yep, they will do funky things without the blocking diode in the harness. Do you have a diagram of how you have the injectors wired? They should be wired just like the Turbo Regal's but for a 4 cyl. The Regal's computer also supply a ground to the injector to make them operate.

Here are some pics for you to contemplate. Appears to me to be totally feasible if you remove a small amount of material off of the edge of the LIM in six places around the L67 injector bosses on the heads. Probably would require less material to be removed than it looks in these pics since the LIM would be spaced up a bit more with the gaskets in place. Of course, I'm assuming you are using an N/A intake with a turbo setup as a SC is never going to mate to the N/A LIM.

The injector holes appear to be angled away from each other enough the injectors would not hit one another, but I don't have any injectors laying around to test that for sure. These pics have the LIM bolt holes lined up with the LIM bolt holes in the heads, so it is sitting right where it would be (minus gaskets) if you were to install it this way.

Good luck!