940 & 960 Help: Injector Impedance query
Matt @mjk_9574
Perth, Western Australia
Hey all,
Ive purchased some Deatschwerks 440cc injectors made for Redblock applications, but they don’t have much in the way of a description in regard to Impedance. On One website I found information that they had a resistance of 8.8ohm. Does this make them high or low Impedance?
Attached is a Characteristics Chart they had on there official website, can anyone make sense of this for me? Electrics and wiring isn’t a strong suit of mine.
Cheers
Matt
Comments
8.8 ohms makes 'em mid impedance.
Regular NA injectors = 0 280 150 762 = 15.7 ohms
Regular +T injectors = 0 280 150 804 = 2.2 ohms
B234 injectors = 0 280 150 749 = 14.2 ohms
Look-uppable on https://www.injectorplanet.com/
So I’ll probably still need some sort of resistors in place to run them do you reckon?
I would, probably around 7 ohms each, non-wire wound, with plenty of wattage, to bring each injector impedance closer to 16 ohms at the ECU.
My ecu is from a 1995 940 Turbo, given they ran low impedance injectors, does that mean I’ll have to somehow make the injectors have less resistance? Or did the turbos have resistors between the injectors and ecu from factory?
If you had low-impedance injectors from the factory, you will have a resistor pack mounted in the engine bay. It looks like four small white sticks of dynamite with wires sticking out the end (honestly best description I can think of).
8.8 ohm is an unusual value, what's the part number of the Deatschwerks injectors you're using?
I’m currently doing a turbo conversion on my NA B230FB motor so it has the high impedance injectors from factory. That’s why I would need to wire in these resistors myself
The SKU on those injectors is: 18U-09-0440-4
Like I said it was hard to find information on these, I can’t remember which website said they were 8.8ohm
Cheers
Here’s a screenshot of some information I found on a Dutch website
In that case, just test it, get a multimeter in resistance mode and measure the resistance between the two pins on each injector and report back. If you don't own a multimeter the $25 budget one Jaycar sells is more than adequate for analogue automotive circuits.
Looks like youll also need to change injector connectors.. Factory ones are Bosch Junior/minitimer.
Raceworks do sell adaptor plugs if you don't want to cut up the factory wiring.
If it's listed for a 940, the plug should be the correct one.