I am not totally sure What impedance of injector to run with this ECU..some say the HI impedance are Plug and Play.Other people are throwing the resistor Pack into the Equation.
My "best Question" would be What Brand of Injector would be Plug and Play for my Build?
'I am doing an s5 streetported Keg with S4 Manifolds and then the S5 Turbo and manifold.(maybe a T04b) on it..2.5 in Down pipe.
What is the Impedance that the N333 Looks For when it is hooked in?
I know how to measure the injector Impedance
IF the stock resistor Pack is Used,then Would it not be used In SERIES with the Injectors,therefore a low set of injectors "can be used" to ultimately bring them to Make the ECU see HI impedance injectors?
I just would like to get the Setup right..
I have a set of 720's Reading 3.6 ohms..That seems LOW to me.
Cheers Guys,.,Help an Old guy out..I just want to Make this Project driveable.
It amy be the Last car I do(seriously..Health is in play)..
Sincerely Dave/STYX...(oh setup I have been contemplating is All 720's,to make it Simple.)./.again it is RTEK 2.1 Cheers.,

 

All ECUs are high impedance. If you run low-Z injectors, you need the resistor blocks in series with the injectors. If you run hi-z injectors, you do not use resistor blocks.

3.6 is low.

 

thank you Again, My Friend.
another Quick question: If the Hi Impedance injectors are used on the Car.(like harness attached to the Engine,ecu,injectors,Etc).then What happens where I plug in the Resistor pack?.Do I have to "complete the wiring".by Taking the connectors out and Splicing wires together,or do I just leave the resistor pack connections dangling?

 

If you use the High-Z injectors you will need to make a patch for where the resistor pack plugs in. Like remove the resistors and then put a piece of wire in their place.

 

if you have a factory resistor pack, keep it and use low impedence injectors. Don't hack it up. You'll only end up with bigger injectors later, and just about everything over 720cc is low impedence.

 

The car right now is an 86 that uses the resistor Pack(saw it under the filter)..
the engine is gonna be an S5.Running S4Upper and Middle mani's and S5 Turbo and Exhaust Mani.
The Harness is a 10ae harness.Can I use the RES. pack with that?
So,that is my "dilemma"
the Rtek likes HI impedance(correct?)..and If I use THIS harness,Then I can Just plug in my LOW impedance Injectors and GO?
..or if I use HI (which the RTEK likes to see) then I have to 'Make a Patch"?
..I hope I am not Beating on the Dead horse..I just need the Info to be Solid.
I have sunk alot of money into this car.Like everyone else,getting carried away.But,to me,it's all I've got.I don't wanna Kill it as soon as I get it on the road.
Thanks Guys...I have the Feeling I should have just Stayed Retired!
STYX!~

 

Post number 2 covers it.

The 86 cars harness has a resistor package in the injector feed line. The resistors are 6ohms and the injectors have a valuve ot 2-3 ohms for a total of 9ohms prior to the ECU.

Any car later than Jume 1987 has no solenoid resistor package. The resistance is built into the injectors themselves. Usually 11-12 ohm resistance in the injectors. So you end up with 11-12 ohms resistance prior to the ECU.

If you use low resistance injectors on the engine, then you need to add 6ohm resistors to each injectors circuit, either before or after the injector.

If you use high resistance injectors you need no resistor in the injectors circuit. The resistance is built into the high resistance injector itself.

Using a EM harness out of a turbo car on a non turbo car results in the wiring b/t that EM harness and the Front harness not being completley compatible. Some alterations to the EM harness would have to be made.

IF you use the 1986 non turbo EM harness on the engine, and use high resistance injectors, then you need to go to the solenoid resistor and cut ITS harness in two. Then splice all five of the wires on the plug of that unit together. Then just plug that modified harness into the 1986 EM harness. Done.

The differences b/t a Turbo EM and non turbo EM harness pinouts is shown in the jpg attached. These two plugs are the ORANGE plugs that interface the Front with the EM harness and are located in the passengers side of the foot well.

Any wire color that has ( ) around them, is peculiar to the TURBO EM harness and thought used when deciding what to do with those peculiar wires. Personally I'd NEVER use a Turbo EM harness on a non turbo cars front harness. It's not worth the time and trouble. IN fact it's a backwards move. A make work project, if you will. A regular little WPA/Obama project.

 

..ah..That is a little more Definitive.Thank you Hailers.
SO.You are saying that IF I am doing a N/A to TII Swap.
-It would be Easier In your opinion to Just Use the N/A engine Harness,and Extend some Wires on it,to accomodate the injectors Etc..(that, I thought would have been easier, If I just got the TII harness and called it a Day).
-The Resistor Pack should be Alright to Use,If I use Low injectors,
-IF I use HI impedance injectors on an N/A harness,I need to splice the Resistor pack wires to make Continuity there.(as the box is in Series with the injectors on the N/A harness.)
ah..this is getting to Be another thread..(i'm going to post in the 2nd gen Specific section,So I don't Bog this one down!).
Thanks guys,Post if you like,I'll read it anyways!.

 

You (styx) and I are going through the same train of thought here. I have a 87 TII (late 86 production, N332 ECU) that I am swapping over to the N333 Rtek 1.7 w/Super AFC. I understood it that I could simply use high imp injectors and loop the wiring on the resistor pack and all should be well.

Am I thinking straight here?

Anyone?

 

Its really quite simple.

Hi-Z injectors do not need resistors so you have to jump out the blocks.

Lo-Z injectors need resistors in series.

 

Ok.I am pretty sure I got this down now.
I got the N/A harness.I am using that,I will use the Stock resistor Pack on the N/A harness,and Hook it up to my LOW impedance 720's..My ECU is a N333(Rtek/2.1).
please someone just say That is OK!??..Thanks.Dave/STYX.

 

That is fine. It is not the ECU that determines the impedence needed, it is whether or not you have a stock resistor pack. If you have a stock resistor pack you should use low impedence injectors.