Unseen24-7

What is the difference between tan and purple top s4 550cc low imp injectors? Or is there even a difference?

stylEmon

iTrader: (2)

tan is low, i believe
and purple is high impedence

87 t-66

iTrader: (133)

correct. all of this info is in the FAQ...

Killert2

what is the difference between the high and the low and what happens if you run the purple ones with out that resister pack?

Unseen24-7

86-87 13B Turbo, low square center, 550cc, tan, 195500-1370
88 13B Turbo, high square offset, 550cc, purple, 195500-1370

These are direct quotes from the FAQ^^. They do not specify low or high Impedance.

TehMonkay

iTrader: (-1)

If you run the purple ones without the resistor pack, you are smart. If you run the tan ones without it, the car wont run, because the resistor pack completes the injection circuit.

Unseen24-7

Ok basically what i need to know is which ones (tan or purple) can I directly swap for my stock '87 s4 n/a (red tops) injectors?

And will I need this resistor pack or does my car alread have it?

87 t-66

iTrader: (133)

they dont?!?

SCCAITS

iTrader: (3)

Red tops are 460 low square. Tan are 550 low square. You need tan for a direct swap. You only need the resistor if using purple b/c they are high impedance.

TehMonkay

iTrader: (-1)

Low impedance cars come stock with a resistor pack because the ECU is looking for high impedance, high impedance cars have direct wiring, additional resistors are only needed when putting low impedance injectors in a high impedance car.

RETed

WTF is with all the misinformation?!?!

When new, they are purple.
When old - due to age and heat - they turn tan.
If it's RECTANGLE plug with CENTER key, it's LOW IMPEDENCE.

The 1988 HIGH IMPEDENCE fuel injectors are RED / PINK, RECTANGLE plug with OFFSET key.
The FAQ is wrong?
*sigh*


-Ted

SCCAITS

iTrader: (3)

The FAQ is wrong or Rotary Resurrection is wrong. What you said and what is below does not match up.

http://www.rotaryresurrection.com/2n...ctor_info.html

Year type impedance plug style plug notch position flow rating color part number
••
84-85 13B NT low square center 680cc orange 195500-0900
••
86-87 13B NT low square center 460cc red 195500-1350
••
86-87 13BT low square center 550cc tan 195500-1370
••
88 13B NT high square offset 460cc purple 195500-1350
••
88 13BT high square offset 550cc purple 195500-1370
••
89-91 13B NT high oval center 460cc red 195500-2010
••
89-91 13BT high oval center 550cc purple 195500-2020

Unseen24-7

Oops, my bad. I guess I was in a hurry when I read those.
I thought it was referring to the offset or center...low square center, not, low [impedance]...[with a] square center.

But now I'm confused. I thought all s4's were low impedance, now it's just '87's that are low?

1gcrazy

I'm sitting here trying to decide what the deal is...
I just got a pair off ebay for my VR4 and they're purple, low, square, not offset. They ohm out just like my tan ones do...
My tans are ALSO low, square and not offset...
I even thought about posting a picture to clear up any confusion.

Now my question is... is it ok to use two different years? I have 4 tans and 2 purples...

RETed

Guess people can't read nowadays...
*sigh*


-Ted

HAILERS

My series four 550's, are Purple, and low impedence/resistance. How 'bout them apples? Eh?

They just are not Nippon Denso. They're Beck/Arnley. Purple. As in brand new Purple.

If you post and are inquiring about fuel injectors, then state what the numbers are on the side of the injector, if stock, and if not stock, then say something in the thread about it not being a stock injector.

1gcrazy

Actually I can... the injectors say Denso on different sides. One is on the right side and the other is on the left side while facing the connector.
They're both 195500-1370. Also the Denso is written in a more italics on the purple injector. The tan is more block letters. The tan injector has the denso "D" before the actual word on the tan one. The purple does not. The tip on my tan ones are 1mm longer than the purple ones. Oh yeah and my tan ones, i'm assuming, were rebuilt because they have a silver body.
But hell, nothing like READING to clear up a mix up so minuscule...
I find it extremely Ironic that you tell me I can't read yet, you never even answered my ONLY question:
"Now my question is... is it ok to use two different years?"

Funkspectrum

iTrader: (5)

IIRC, one is peak and hold and the other is saturation....I can't remember which is which. you don't need to know if you have an EMS...lol...

HAILERS

If they are -1370's, and the keyway is centered and not offset, then they are low impedence/resistance 550's. If your car is a early 87, as in mid 1987 and prior, and has a solenoid resistor package located below the afm/filter, mounted on the inner fender, then use what you described. Like RETED says, the color fads into a tan/brown/discolored piece of plastic over the years.

Low impedence is 2-3 ohms, closer to 2.2 than 3 ohms.

Personaly I'd put the purple ones in the primary holes.

There is a chassis number that goes with the low impedence injectors. But if the solenoid resistor exists, then your car gets the low resistance injectors.

The chassis numbers are in this thread: https://www.rx7club.com/showthread.p...chassis+number EVEN though I'm writing about NON turbo cars in that thread.

*TOUCH*

iTrader: (29)

not to thread jack, but i recently just bought some injectors off another member, they were suppossed to be 4 LOW imp. 550cc's. last time i bought some (also low imp. 550cc) they were tan like they should be. these ones i just bought were rather weird. 2 were red tops (like n/a injectors) and two are gray tops?! all of the numbers are badly melted and illegible. also, like someone posted before, the bottom of the injectors are metal and have a small needle like thingy coming out of it, completely different from other ones ive seen. i've tried to pm the guy for a couple days, but no response...are these possibly aftermarket? or did i just get got.....

1gcrazy

Ok, these injectors are going on a 94 3000gt Vr4. I'm still not getting straight information. Some poeple are telling me they are faded and the other are telling me they're are low imp saturated....

So if its a saturated injector does that mean its high imp and all low imp are peak and hold?

1gcrazy

http://forum.aempower.com/forum/index.php?topic=4291.0
Can't be true... my injectors, ALL of them are peak and hold and they're both 550's... probably from different years because of the change in denso badge and all that.
Peak and hold is low imp and saturated is high imp.

HAILERS

RETED is right. You can't read worth a damn. IF they are -1370's, centered tab, they are low resistance 550 injectors. The present color does not matter.

RETed

I really don't give a **** about the nitty gritty details.
If you're so hard up on what EXACTLY you have, have them flow-benched by a competent fuel injection service shop.
THAT should answer all your questions, period.


-Ted

Aaron Cake

iTrader: (1)

People put way too much stock in the injector colour. The ONLY thing that matters is the part number. Get the part number and then look for it here:
http://www.witchhunter.com/injectordata1.php4

That chart will tell you everything you need to know about almost all common injectors. Colour means nothing.