BoostedRotors

I need help wiring up a resistor pack on my 88 TII. Anyone know how to do it? Its off an 87 NA, Just dont know how to wire it up...anyone done it? Anthony where are you?

1_dollar_83_RX7

i have no clue but....im parting an 88t2, i can sell you a part off that if that helps any

BoostedRotors

what color is it?

1_dollar_83_RX7

what is the resistor pack exactly?

BoostedRotors

bump

Rpeck

Bump....

hypntyz7

www.rotaryresurrection.com tech section injector info should help. Basically it's harder to use a stock 86-87 injector resistor pack, than it is to buy the radioshack resistors and wire those in. BUt you can use the stock one. Youll have to get 12vdc to the center wire of the 5 in the resisitor pack, and the other 4 pinouts go to the 4 injectors, and the grounds still go straight to the ecu(from the injector plugs). ITs easier to just buy 4 seperate resistors and wire them inline with each injector wire, positive or ground wire doesnt matter which so long as one injector gets one resistor, 10 ohm 10 watt is what I have used before. Theyre white bricks about 2" long.

Rpeck

I can use a resistor on just 2 injectors right? I just want to do my primaries with the greddy 720's I have. My secondaries were over sized to 1000cc already.. and are the correct impedance. Also .. any idea why the stock resistor pack needs power on the middle plug? Is this what the injectors use for power? Any good ideas of where to tap the power from? and what guage wire to use Etc.?

hypntyz7

The way the stock system works is:

power is supplied to the injectors constantly(12vdc+) when the switch is on. IF youre running a low impedance system, this power is first run through the resistor pack, divided 4 ways, then sent on(at a higher resistance) to the 4 injectors themselves. The injectors get their ground straight off the ecu, which turns them on and off, the ecu pulses this ground really quick. Get it?

You can put resistors on just 2 of your injectors, and the easiest way is to wire those resistors inline with those 2 injector wires. THis means no running of power wires, etc. just splice and connect.

Rpeck

Right on, just to clarify things .. cause I am staring this project tonight; I have a 88TII with stock high imp injectors. I have gotten a resistor pack from a 87, If I wire just 2 of those resistor wires inlne with my primary injectors I should be all set? I do not need to apply power to the resistor pack itself.. and I can leave 3 of the 5 resistor pack wires unused? Am I missing anything or does that sound about right?

Also on your web page you list a GP Sorensen part number for a injector plug ... is that the center injector plug (low imp) or the ofset (high imp) plug that you list?

The power plug in the middle of this injector pack does not have any bearing on the resisters them selfs functioning right?

Thx again.

hypntyz7

To use the stock resistor pack youll have to take it apart, and use only 2 of the resistors unless you feel like cutting and extending part of your stock wiring harness. The stock resistor pack uses 4 resistors, each with an input and output. The inputs are all 4 wired together to the one center input wire, so youll have to seperate these to obtain 2 of them. The outputs are the 4 pinouts surrounding the center pin, and went to each of teh 4 injectors. Note which way current flowed on teh resistors before reinstalling them. Once you have successfully remoced 2 resistors adn have access to the input and output of each, splice into one of your 2ndary injector wires and put the resistor between the splice, output facing the injector.

The GP sorenson part I list is for plugs with a center notch. I didnt find one for offset notch, but you mihgt inquire at autozone or whateer you have out there. They ahve to look under your year/model of car, under fuel injectors, to find them, and it is not always a usually stocked item.

Rpeck

So, if I split the resistor .. the middle “power” wire needs to be spliced to have 2 leads coming off it? 1 to each injector? Is that right? … also, If I mount these 2 resistors under the upper intake manifold (closest point) wil I have any issues with heat?

U da man.

hypntyz7

I still dont think youre seeing what Im saying. Youre going to take each of the 4 resistors out of the pack. ONe side of the 4 resistors, wil have 4 wires joined into one wire at the pinout. Youll have to cut/seperate these wires(inputs) in order to seperate the resistors. SO youre going to wind up with 4 resistors, each with 1 input and 1 output. Select 2 of them to use. Note which is input and output. BEst place to do this mod is at the ECU, away from heat, and so you dont have to take apart your motor. Use teh FSM wiring diagram/ECU pinout chart to determine which wires (pinout positions) are 2ndary injector wires, and splice the resistors into them there. THe input should point to the ecu.

Rpeck

Here is what i am looking at .. it only seperates in 1 spot ... making 2 pieces, not 4. Can you make anything out of these photo's to explain what I need to do.

Thanks again

DaleClark

iTrader: (55)

Dude, just get the Radio Shack resistors - we've been running them around here for YEARS with no ill side effects whatsover. They're like 99 cents for 2 of 'em. 10 ohm resistors.

Dale

Cheers!

what wattage resistors?

hypntyz7

Yeah, I seconds Dale's suggestion *again*

I havent ever took a resistor pack(stock) apart like that, so I thought it would split into 4. Guess not. I wount try to do what youre doing with it really. Better to buy the radio shack resistors which will each have an input and output so you dont screw anything up at the ecu adn cause more problems. Sorry for nearly steering you wrong, but I didnt know that thing stayed in 2pcs.

Rpeck

Well her eis the Radio shack reistor problem. I read at least 3 posts .. where peolple cound not get those to work righ t.. (while searching for info on this) I asked like 5 times if anyone had the part # for one hat they KNOW works. noone had that info .. then someone posted .. just use the propper one that came with the low imp 7's .. so I went out and payed to get this resistor pack .. cause it was soposed to work

the other thing is .. the porpper resistor pack (in my hand) says 6 Ohm, 64 micron .. why would I get a 10 ohm from radio shack??

I am beginging to wonder if anyone has ever really done this


read this post .. you can see where I tried to get info on this .. I even posted a link to radio shack .. asking is this is the right resistor .. then It was sugested to get the one that came with the low imp cars.. so I did that. I don't know what to do now ??
https://www.rx7club.com/forum/showth...hreadid=121793

DaleClark

iTrader: (55)

Dude, you're making this WAY more hard than it needs to be.

It's a 10ohm, 10 watt resistor. It looks like a 2" long concrete block. It's pretty much the only resistor Radio Shack has in stock that even looks like that.

Just get it, splice it into one of the injectors wires (either one, doesn't matter) and you're done. It's so easy it's criminal.

Just make sure to get a good connection - solder it well and wrap it up good.

Dale

DaleClark

iTrader: (55)

I even checked Radio Shack's online catalog -
Part # 271-132

Dale

Rpeck

Thats the exact one I pointed out .. 3 weeks ago in my first post ... I even linked to the radio shack web page. So that is the one you use? and your sure it works just fine?

If you get a chance read that post i linked to just above here.. Someone said that the radio shack resistors did not work.

DaleClark

iTrader: (55)

That's the resistor. It will work.

Considering 90% of the people around here can't get a freakin' air fuel gauge to work, I don't doubt that people can't wire in a simple resistor. Cut wire. Attach one wire to one end of the resistor, attach other wire to the other end. Done.

Dale

Rpeck

Alrighty then .. I just called my local radio shack, they have 2 packages of 2 .. of those resistors in stock. I am going to give that a go tommorow then. Worse case senario? it doesn't work, right? I mean if I wire everything corectly .. I can't blow my ECU can I? But in theroy .. if I do it all right, And I don't see how I can't if I wire it at the ECu .. i should be all set.

DaleClark

iTrader: (55)

Worst case scenario the car won't start. Again, just make SURE you have a good electrical connection - you can't just wrap the wires together and slop on some electrical tape.

Good luck,
Dale

hypntyz7

I have done this before using the radio shack resistors too, so add me to the list...