Injectors
 

I found these on line - the price is pretty good. I know our cars need 5.5 ohms; these are 2.3. Do I need resistors or will they work right out of the box? TIA

http://www.racetronix.com/3102FM.html

They will work right out of the box. You do not NEED resistors however it's not a bad idea to run them. There have been a few people over the years that have burnt up the injector drivers during track duty without them. I run them mainly because they're so cheap and easy it's decent insurance. You can always install the resistors later.

Cool. Thanx Jeremy. :cheers:

Michelle,

I have resistors if you need them..

Dave:

Do you know the specs on the injectors I had you pick up for me? I'm assuming they are high impedence and I can just unload them on ebay. I'm going to send them to Alicia's brother who has a friend the can test them for me, but I thought you might be able to call the PO and find out for me.

I can't remember but you can OHM them out. Give me a call later tonight.

If you enjoy a working DME then you need resistors.

Typically you would use two 1 ohm resistors with 2.5 ohm injectors. Since these are 2.3 ohm injectors, I would suggest using two 1.5 ohm resistors according to what I've shown below...unless I figured something in wrong...

The ECU driver is rated at 16 amps.

Without resistors:
2.3 ohm/4 = 0.575 ohm combined.
12v/0.575 = 20.9 amps.

With two 1 ohm resistors and 2.5 ohm injectors:
2.5 ohm + .5 ohm resistance(a 1 ohm resistor on each of the two injector drivers) = 3 ohms each
4 injectors would be 3 ohms/4 = 0.75 ohms
12v/0.75 = 16 amps.

With two 1 ohm resistors and 2.3 ohm injectors:
2.3 ohm + .5 ohm resistance(a 1 ohm resistor on each of the two injector drivers) = 2.8 ohms each
4 injectors would be 2.8 ohms/4 = 0.70 ohms
12v/0.70 = 17.1 amps.

With two 1.5 ohm resistors and 2.3 ohm injectors:
2.3 ohm + .75 ohm resistance(a 1.5 ohm resistor on each of the two injector drivers) = 3.05 ohms each
4 injectors would be 3.05 ohms/4 = 0.7625 ohms
12v/0.70 = 15.7 amps.