BlackRx7

okay this is for you gurus....., I just install dome 720cc, that say denso on the side they have square connectors just like my 550s that i took out, but the have a centered notch on the outside bottom and the 550s have an offset notch , the 550s have purple tops the number on the side is 195500-1370, and I wanna know are they high or low Imp.? I have installed the 720s and the plastic connector kinda snaped but the metalic parts are connected, I have them in my car now and it runs okays, I have been having a slow reving problem but I thought that was just cause it was too rich.....please someone tell me whats up, tommorow I will test the resistance with my dads multi-meter, but if someocan tell me now that would be great.....

BlackRx7

somone must know!!!!!!!!!

BlackRx7

hello!!!!!!!

HAILERS

Offsets are high impedence, centered are low.

Put your meter on ohms, touch one lead to one prong and the other lead to the other prong. Low impedence usually run 2-3 ohms, usuall closer to 2.1 to 2.2.

Also look at this thread, about half way down the page:https://www.rx7club.com/forum/showth...ght=1955002020

And if that does not sate your appetite for injector info, just highlite the numbers you wrote 195500-1370 and paste that into the SEARCH engine on this site. You'll see a whole handful of items on injectors.

BlackRx7

hrmm, well if they are high and the 720s I installed are low, would they not work? cause my car drives, just not like it used to.

BlackRx7

and how do I jumper the fuel pump resistor.....

BlackRx7

okay the fuel injector resistor block, come on people my car is in dier need!!!!!!

BlackRx7

Hello all these threads about nothing and I need help and no one cares, guess this forum really does blow *****

bl|nk

from my understanding it'll burn up your ECU... You need to do the 10ohm x 10watt resistor inline with each injector that you replaced to low impedence. I went to a junk yard and got the bosch l-jet plugs they plug right in.

BlackRx7

**** I guess I'm just dumb, the 550s were high and the 720s were low, got confused sorry for the forum flame, i deserve a flame now:

You can use low-impedence fuel injectors in a car originally designed to use high-impedence fuel injectors by running some 20-watt, 10-ohm resistors. You can use high-impedence fuel injectors in a car originally designed to use low-impedence fuel injectors by jumping the fuel injectors resistor block located at the front, passenger side of the engine bay.

vmb

didnt you buy them used from a guy on the forum who stated he would include the reisitors????
and for your info
your the one that blows

BlackRx7

I desvere that, and no resistors were included, I just got me some from radio shack 10wattx10ohm, but teds site says to use 20wattx10ohm???

vajenson

I finally got help from one of your members. This was great beacuse I got the fuel pump cut off instaled etc. This car runs but acts like it has about 50 hp. It drives down the street and will go to 7k rpms but it is slowwwwwww. I wonder if there is a timing deviceon the trailing plug?
Anyway I would love to sell the entire car for about 5-700, as I am very frustrated with it.

BlackRx7

okay last question which of the 2 wires that go to the injector do I install the resistor on?

Felix Wankel

Dude go buy a multimeter before you burn something up. The power wire to the injector is what gets the resistor.

Also, the 10 watt ones will not work. Your car will run like total ****.

PS I've posted like three times in your injector threads telling you what to do, am I on ignore or something?

BlackRx7

I know I'm a total dumb **** young dumb and full of stupid thoughs!(please kill me), I'd tell you to hit me if you where here, I have a multimeter, is the power wire the white one, how can I tell from using the multimeter, and where can I get a 20wattx10ohm one?

HeffBoost

Isn't he running a chance of frying the ecu running LI injectors on a HI system?

I thought it didn't matter which wire the resistor went on.

Felix Wankel

Turn the key ON. Set your meter to the proper DC volt range. Stick the ground probe to the ground bolt on the firewall, or to one of the strut tower nuts (if it will reach). Probe each of the two wires on an injector plug with the positive lead of the meter and see which one has 12V. That is the wire that gets the resistor. The injectors get constant 12V, the ECU grounds them to make them pulse.

As for the 20 watt resistors, I bought some at Radio Shack, but I had no luck with them either. Most people seem to though. I used a resistor pack off an 86 FC because I had it laying around.

BlackRx7

what about the heat of the engine? should I find which one goes where on the ECU plug? or should I just install them near the injector, some people have told me it is possible to blow the resistor from heat, is this true? or is it safe enough to just wrap them up a shitload of time with electrical tape, one more thing where on the car can I find the resistor pack?

p.s. I really do appricaite the time and patience you have given to my stupid brain...

Felix Wankel

Download one of the FSM's and look for the injector wires on the plugs to the ECU. I think the resistors would survive better in there.

I had mine hooked up in the stock place with different power wires run to the injectors. Truly the ghetto way.

BlackRx7

what about the resistor pack where on the car can I find it?

Felix Wankel

On a pre-87.5 car, it will be on the passenger side fender well, underneat the stock air box. It is an aluminum box looking thing, with one plug that has a 5 prong connector on it. It is held on by two 10mm bolts.

They do not exist on any car after June (maybe July?) of 87.

BlackRx7

okay this is it right?
https://www.rx7club.com/forum/attach...postid=1320242

so do I unscrew it to get to the resistors or do I just plug it in somewhere else...

BlackRx7

bump

BlackRx7

so with the resistor pack what do I do with it? take it apart and use the resistor in it? each resistor are 2 prongs on one sire, and a ground wire going to the other side, what do you mean by you mounted it in the stock position? these resistors say 6 ohm x 2 on the side?, I really wanna get my car running today, anyone help please!!!!!!!!!