But I guess there are not stupid questions...just stupid people. Anyway, I fall in the stupid people category, so can someone explain the low and high impedence of the injector is all about?

 

from my understanding (limited. ), it has more to do with the puter.
diff heat ranges, signals.
was trying to find some injectors for my kids ride (cheap), but her ride requires high imp,
was told that something in the puter may overheat it if i used low imp.
again, limited knowledge and experience...

 

Ill be stupid with you! I would like to know also.

 

You are on the right track. I talked with a vendor (and actually ordered some) about this and he said that you want high impedence as you would have to change drivers in the computer to run the low ones, otherwise it will cause problems and not run.

 

Injector FAQ

 

Don't know of what advantage a low impedance injector has over a high when flow rates are eual... but, I know there's few to choose from when it comes to high-impedance injectors for 800plus rwhp...

Impedance is resistance. If you put low resistance on something (circuit driver. in this case the pcm) that is designed for high it'll allow too much current and will eventually burn out. Just like shorting out an audio amplifier.


This is at least how I understand it..

Arnel

 

It is a good question and most people don't understand the difference.

Low impedance injectors allow about 4x the current to hit the coil and therefore have way more power to move the pintel. This is why they can be much larger and more responsive than high impedance injectors.

They require a much more complicated driver circut that will peak, then hold the coil open. So full current/voltage is applied to open, but then reduced to 1/4 just to hold it open. If you did not do it this way, the coil would quickly burn out.

High impedance injectors are super simple. You just apply the full current to open and leave it that way until you want to close it (known as saturated mode). The high impedance/resistance is what keeps the current to the coil in check. This results in a much weaker mechanism to control the pintel/disc.

There are boxes that can convert a simple 12v high impedance signal to a low impedance peak and hold signal. Our PCMs can only apply a simple saturated signal to the injectors. In fact, I think the PCM just grounds each injector to pulse it.

There are some people that take a normal high impedance saturated signal and put resistors in front to run low impedance injectors. This is extremely stupid, since the injectors are running under very low current all the time and they end up performing like crap (if they even work). You have to have a peak and hold driver to run large low impedance injectors.