I'm switching to a R-tek stage 1.7 with the stock turbo. I have a set of low impedance 550cc and 720cc injectors. Wil this work without changing anything or should I track down high impedance injectors?

Any feedback would be awesome.
Thanks.

 

The ecu sees HI Impedance,so either you have a harness that has resistors in line with the injectors,A resistor pack that connects them inline with the Injectors OR get HI impedance Injectors.
Your question is a common one.

 

Judging by your name, I'm assuming you have an 87? As long as no one has been in there before and changed the stock setup, your car should be set up to use low impedance injectors with a resistor pack in the emissions harness.

 

..If he uses the 87 N/A harness and hook it up to his Turbo engine,then Yes,he will be fine...(early 87 though.)

 

Hey guys, thanks for your input. It's not an 87. That was my first car. It's a 1990 RHD. As for a harness, I don't have one yet. I'm removing my megasquirt and turbo setup to go back to stock. So I will probably us a stock harness out of a 1990 JDM car.

 

Oh and the ECU is N374 and the injectors are from my previous build. I have the stock 550cc high impedance injectors but want to upgrade a little (stage 1.7 opposed to 1.5). If it's a huge deal I'll just do the stage 1.5 from rtek but i was just wondering since i had these other injectors if I could use them.

 

you know it is always good to inform members of your Dilemma and be specific.
In the future state it clearly. The s5 is a totally different setup.
Good luck with the N374 ECU,you will need it.They are nothing but problems.(you need an N370)

 

Pocketlogger is now chipping N374s to make them functional. They're not totally useless now!
Rtek7 ECU Upgrade Detailed Information

87Adam - If you want to use low impedance injectors, pick up some resistors to wire in-line. 6 ohm, 10+ watt resistors will work and mimic the resistor pack found in early S4s. Wire them in (solder!) at the ECU connector for easy placement. Your bigger challenge will be injector pigtails will all have to be cut off and replaced with the rectangular S4 versions. There are some aftermarket sources for this type of plug.

 

Thanks so much! I'm going to send my ECU into pocketlogger this week!! Then I guess I'm going to have to track down some resitors. If I have to wire in some new pigtails would it be easier to put the resistors in that joint? Or better to hide them? I'm pretty pumped to get my fc back up and running. Been to long.

 

Another question: Do stock S5's use high or low impedance injectors?

 

You could put the resistors at the pigtails, but they're pretty big.

High

 

Perfect. Thanks very much. I appriciate all the help.

 

I've found an S4 harness and 4 720cc low impedance injectors. Would this work better?

 

You do not mention Car,engine,..anything.
Trying to get info from you is like pulling teeth.
Can you Elaborate on what you are working with so someone can help you further?
14 posts and you are providing info on the fly.
No offense Adam,but if you can just take a minute and type in more info then you can get everything answered.
Right now it is like "Psychic JO-JO" trying to figure out your car setup,the parts that you have, or your intended goal.

 

RotoryRocket88 already answered the initial question. I did mention more specifically what I was looking foir after your first post. I was refering to this comment to see if a stock s4 harness would be better than wiring in resistors.

 

You could swap the EM harness for an early-S4. It'll be quite a bit of work.

 

Cool. Thanks