UK952

Thanks
Tony

Epic2112

I bought the resistors when I bought new injectors, but I've been too lazy to install them. I have no doubt that the lower impedence makes the DME work harder, that's how electricity works. The question is does it make it work hard enough to kill it. It makes sense that it would, but I don't remember anyone ever saying that they blew a DME and were able to trace it to this problem. Still, if I were doing any DEs, or any seriously spirited driving for a considerable amount of time, I would use the resistors.

RPG951S

My .02c,

I've heard from several reputable people (Markus Blazsak, for one), that people have been running the Siemens injectors for years without resistors.
I'm running mine coming up one a year with more than 10 all out track days. No problems.

testarossa_td

To be or not to be that is the question....
Siemens with or without your choice.

Andial951

I have been folloowing this debate now but I am wondering is the debate the same if you are using Delphi injectors?

Raceboy

Actually the difference between Low-Z and High-Z injectors is NOT just plain impedance, they operate in a different manner. Low-Z injectors are PWM-type (pulsewidth modulation) also known as peak-hold injectors. Despite having less impedance, they need to be held opened according to pulsewidth and it takes less current to hold them that way. But, afaik 951 DME does not have PWM'ing capability and using Low-Z injectors does not give you even slight improvement over High-Z ones. It just stresses the unist a bit more. Best way to go for very precise individual cylinder tuning and good injector (thus fuel flow) control is to use PWM-capable ECU (mostly aftermarket) with good power-flyback and in sequential injection.