Help rb20 injectors?

[Kouks]

I dont know where to start off. My mechanic has tried all kinds of crap.

My wiring harness that I bought from NOTASR, was using a DSm resistor. I suppose it worked when he had it on his car. It didnt work with the rb26injectors i had on there. Installed 550's(rx7) injectors, to no avail. Then he said rb20 injectors fit on there, and installed those and removed the DSM resistor. Dumb? Umm, I found the wiring to hook up one, do I need it with the rb20 injectors?

Maybe when he hooked up the z32 maf, he killed my ECU? Umm, no SAFC was hooked up at the time. I have so many ideas on what could be wrong. Im gonna get it back in my hands tomorrow, and see if I can figure it out. Lemme know guys, I definitely appreciate any help you guys can give me.

[boost_boy]

It's very hard to say what happened because someone else was working on it and if you didn't see them do it, no telling what in the hell they did. Unless the RX-7 injectors were high impedance units, why did they remove the resistor? 2nd of all, RB20 injectors aren't that big of an upgrade, so again why are they toying with those injectors? It's too much work to be pulling out injectors for the hell of it, so if they are charging you labor, you will be charged pretty good. And at worst case scenario with this z32 AFM and other injector crap, anything could've happened to your ecu up to and including burned-out the injector driver or even toasted the AFM circuitry which costs about $150 to get repaired.

Dee

[themadscientist]

RB20DET injectors are a downgrade. They are high impedance (no resistor) 260cc compared to the CA18DET low impedance 370cc ones. If somone was in there screwing around before you assume they screwed something up. I fried a CA18DE comuter when I used it to run a CA18DET harness and injectors once. Anywhere there has been factory wiring wrap removed and retaped uncover it and ensure if anything was done it was done right.

[Kouks]

ka-e injectors are 260cc injectors. Rb20's have 370's i thought. rb26 has 444cc, which I have also, but they didnt fare well with the resistor, maybe mine was bad. I installed my safc, hooked up my z32 maf(just to try) and did 2 in 6 out and it wouldnt even idle. I unplug the maf and it stays in safe mode and will rev to 2k if I ease it.

Im getting another ECU and BRAND NEW Ca harness tonight, so maybe I will use the new harness and ECu and see if that fixes it.

What else could it be, I have the car in my hands now, so anything you can suggest I can do. HELP!

[UMS_CA18DET]

RX-7 550cc injectors are High Impedance, RX-7 440cc are low impedance. When using high impedance you may of burnt out the ecu injector drives, thats why their is a resistor pack because the ecu cant handle that.

[Kouks]

I had rx7 550's on there with a resistor pack. ECU wasnt tuned for them, but it would barely even idle, like it was starving for fuel. I have walbro 255.

Before that I had gtr 444cc injectors with the dsm resistor and it would do the same.

Currently have rb20 injectors with no resistor.

Thanks for any and all help!!!!

[UMS_CA18DET]

so pretty much you added resistors on injectors that already had resistors built into it. High Impedance injectors mean they have over 10 ohms of resistance they do not require resistor packs. Not to mention the ECU is not setup for controlling high impedance injectors since high impedance require high voltage constantly thus why they are called Saturated injectors because they get high voltage all the time. Low Impedance injectors are usually 4 Ohms or less and require resistor packs, they are called Peak and Hold. The peak is when they get high voltage than quickly switch to a lower voltage and stay their which is the hold.

Pretty much playing all these guessing games is one of the reasons why you may of damaged your ecu.

Try another ecu and put the stock CA injectors and see if your still having the problem. If its the same than you have more problems, if its better than do more research on injectors before putting them in.

[themadscientist]

ka-e injectors are 260cc injectors. Rb20's have 370's i thought.

CA18DET =370ccRB20DET =260ccRB25DET =370cc (sidefeed though)

[Kouks]

Okay cool I guess, even though I wasnt the one guessing, my mechanic was the one swapping injectors and he could have done the damage.rb26 injectors are high impedance?

Thanks for all the help guys, I really appreciate it.

[rexhunta]

no rb26 injectors are low impedence, hence straight swap from ca18 injectors.

[Kouks]

I had rb26 injectors on there, with the DSM resistor, and it wouldnt run correctly. Ahh, well Im gonna get stock injectors, and install STOCK MAF for now, and see how it does, along with new ECU. He switched to high impedance injectors.

Maybe the injectors were bad? I havent tested them. Im gonna send them off to Deatchwerks or whatever and get them cleaned tested and see if they are okay, later if they are still good, ill install them.