Ok.. I just came in from doing my fuel system on my turbo motor. I installed rc550 injectors and a resistor box for them. I have my fpr set to 40 psi and i have a 255 intake fuel pump. The injectors are just pouring fuel into the motor. could this be a poor resistor install? I also have hondata hooked up for 550 rc injectors so it should idle. It started once, but it ran terrible and i just shut it off. No other luck so far.

I believe this is how the resistor box install is. I have obd2... and i cut the vellow/black wires and twisted them all together and hooked them to the red wire. Then i put all four black wires and the other ends of the wires to the injectors. Would the poor install add too much fuel?? what should i do?

 

ttt

 

So, in essence, you hooked all 8 injector wires to the resistor box? That would sure as hell cause a problem. You are only supposed to take each yellow/black wire from each injector and connect each one to a black wire on the injector resistor box, and then connect the red wire from the injector resistor box to a +12v power source (most any other yellow/black that is going into the gang plug would suffice.) Thats it. You leave the other wire connected to each injector as it was before you started (ie: the brown/red/yellow/blue stay the same)

Good luck.

 

ok... I just bought some 10 wat 10 ohm resistors to put them inline with the setup.... The same thing happened with the resistor box. I pulled the plugs and it was flooded, both times. I have hondata in there with a map made for 550 injectors. What is the problem??????

 

It started up once, but idled like crap and shut itself off within like 10 seconds.

 

Here is an HOWTO on resistor box install.

https://honda-tech.com/zerothread?id=517274

Check if every thing is connected right.

/PH

 

is this an ok way to do it??? I have the yellow and black wiera and i clump them together and then hook the red wire to them. Then on the injector side of the harness i connect the yellowblack wires to the 4 blacks for the pack. Also i just tried to put the inline rsistors in???????

 

4 yellow/black wires from ecu to 1 red wire in resistor box, and 4 yellow/black wires from injectors to each 4 black wires on resistor box, yes.



/PH

 

i thought rc injecotrs dint have to use a resistor box

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ironcheftony &raquo;</TD></TR><TR><TD CLASS="quote">i thought rc injecotrs dint have to use a resistor box</TD></TR></TABLE>

i had 310's and i definately didnt have to use one

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ironcheftony &raquo;</TD></TR><TR><TD CLASS="quote">i thought rc injecotrs dint have to use a resistor box</TD></TR></TABLE>

i thought the same thing.. maybe anything after 440cc injectors you need them or he doesnt have 550cc made for a honda?????

 

You can get RC 550cc injectors in saturated and PnH.

What injector correction factor are you using on the Hondata?

 

Find out if they are saturated. Saturated RC injectors don't need resistor boxes. And yes, they do make RC 550cc injectors in saturated. Try taking the resistor box and inline resistors off and see if the car idles.

 

You can simply measure the resistance b/w the two terminals on the injectors to see if they're high- or low-impedance. No need to play guessing games with trial and error.

 

They are peak and hold injectors. On the flow sheet from rc engineering it says p&h 2.5. I just dont get it. I wired up the resistor box identical to that setup up top, and the inline resitors were put in after the resistor box didnt work. Neither worked?

I bought a chip from wirespeed lab and told them i had 550 injectors.

 

Take the chip to somebody with a chip programmer and Hondata ROMeditor so they can pull the image off of the ROM and check the injector correction factor. Then they can flash a new image on the chip as needed.

It could also be that your engine isn't pulling a strong vacuum at idle, so it's using too much of the next vacuum column for fueling instead the 2nd or 3rd columns corresponding to around 20" Hg.

The difference in b/w those two columns is enough to drop the AFR's a whole point.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostfedb18c1 &raquo;</TD></TR><TR><TD CLASS="quote">
i thought the same thing.. maybe anything after 440cc injectors you need them or he doesnt have 550cc made for a honda?????</TD></TR></TABLE>

You guys think they only make one kind?

They make both low and high impedance injectors. Get with the program.

 

Have someone check the map to make sure it's setup for your injectors.

 

What would be the problem if the wiring is bad (which it isnt for sure). If they are p&h and they are just shooting fuel in, does that mean they arent being resisted?

Also, could the be saturated by some chance? What would happen if i resist the saturated injectors?

 

John, first thing Id test would be the injectors. Do you have a multimeter? If you test the resistance of the injectors (take the clips off) it should be about 12.5 ohms if they are SATURATED. If they are P&H then they will be much much lower, about 2.5 - 3 ohms. This way you can verify what they are exactly. You can also take a 9v battery and jump the leads on the injectors. If they click on and off, you know they are working.

If you have saturated injectors (which I have a hunch you do) then you dont need the resistor box.

Also your Hondata map has to be setup for the size and imdepance of your injectors or you can expect inconsistent results (like what your experiencing). Same as if you resisted saturated injectors. Theres no room for error here.

 

the resistor box is not your problem, you hooked it up fine the first time. All 8 wires should go to the box. 4 go to the black wire and then the other 4 go to the red, it works just like inline resistors. My friend has been running his PnH injectors like this for a while with no cels or idling problems. Have Hondata turn those 550's down! It has nothing to do with your resistances as to how much fuel they are flowing, you are trying to run 550's with a 240cc fuel map, which is crazy rich, you have to turn those injectors way down at idle using Hondata.