i need them cause my gf got me rtek 1.7...anyone wanna buy the other 2 from me? also they are for an 89-91 but im pretty sure i can just add a resistor to make them work? i need some help here guys...will these work...and does someone wanna split it with me?

http://cgi.ebay.com/ebaymotors/Mazda...spagenameZWD1V

-Matt

 

yes they are right but you can get them for $107 brand new each, i can't remember the site but i know a few places sell them for around that price.

edit: i see that is for 4, not a bad price then for serviced injectors.

the Rtek instructions will tell you if you need to add resistors or not as all 720's are high impedence (s5 series). or was is they are all low impedence, **** now i forget... i have a set sitting here maybe i will ohm them out later if you need the info.

 

i would not buy from that seller, the injector in the picture is 86-88 style conecto,r but the auction claims its s5 injectors(diff conector) , who knows which ones u would get....

 

I would be very careful about purchasing those.

1) The picture looks like *STOCK* 1988 FC turbo 550's - red top, high-impedence.

2) If the picture is correct, they will not fit your Kouki electrical plug, period.

So something smells fishy here...


-Ted

 

wrong
bought them before
they are "find"
infact, they are "blue tops"...
just generic rebuilt injectors...

 

So have you flowed the ones you got from that seller? My 720's are blue also and if thats true about the seller then its a hell of a deal.

 

If you get them and they are 720cc.....I will take the other 2.

 

many pics on ebay are generic ones, not of the actual item. by his feedback i would trust them to be right.

 

1) that picture seems pretty generic as i have seen these injectors for sale many times on ebay with the same picture

2) i have a zenki FC....which is why i was asking if i had to add a resistor since they claim to be for a kouki

3) FEEDBACK LOOKS GOOD...

EDIT: go to the sellers store and you will see he uses that picture for all kinds of injectors....

 

http://cgi.ebay.com/ebaymotors/2-Maz...temZ8021823243


no need to split them as he sells in pairs also

 

not sure if you need a resistor since it is going with an Rtek, i haven't dealt with the version 1.7 yet so i'm not sure if you need resistors or not.

 

If they are High Impedence then he will probably have to run resistors with them, but the ecu should come with some kind of instructions for that.

 

all ECUs in s4 and s5, and even the rtek, are designed to think they are working with high impedance injectors.

the 86-87.5 have low imp injectors with a resistor pack, which turns them into high impedance basicly

then the 87.5+ just use high imp with no reistor pack

check the ohms on your old injectors, then check if you have a reistor pack or not.

 

i wasn't sure if the Rtek corrected for that or not since they require 720cc secondaires.

 

thanks...that makes a lot more sense....so basically the only thing i need to find out is if RTek wants low or high impedance...ill check the site and see if i can find something.

 

all you guys are getting this stuff wrong!!!


NO NO NO NO , ALLL ECUS are designed for HIGH IMPEDANCE!!!! ALL OF THEM EVEN THE RTEK!!!!! THE RTEK IS DESIGNED FOR HIGH IMPEDANCE JUST LIKE EVERY OTHER 2nd GEN ECU

its the wiring harness that desides which injectors you need!!!

you will either have
option 1:
LOW IMP injectors (2-4 OHM) with a resisitor pack( 10 OHM) built into the harness( by the front passenger corner of the engine bay.
WHICH RAISES THE IMPEDANCE TO 12-14 OHMS to simulate a HIGH IMP INJECTOR

OR
option 2:
you will have high imp injectors (12-14 OHM) with NO RESISTOR PACK.

 

CHECK for the resistor pack and then check the OHMS of your old injectors.

IF YOU HAVE OPTION number ONE

then you need to purchase LOW IMPEDANCE injectors
OR
if you screwed up and bought high impedance injectors
you will have to ELIMINATE PART OF THE RESISTOR PACK that goes to the NEW HIGH imp injectors otherwise you would have the 13 ohms of the injector +the factore resitor pack(10 ohm and your ohms would be around 23 which is TOO high to work properly! the ecu needs to see 13 ohms!!



IF YOU HAVE OPTION number TWO,
then you need to purchase HIGH IMPEDANCE injectors, OR
you can use low impedance injectors WITH a 10 watt 10 OHM RESISTOR( TO RAISE THE Effective impedance to that of a HIGH IMP)

 

ok thanks...im just gonna get rid of the resistor pack if i have one...and if not then i wont have to do anything. im putting in new injector clips anyways cause the old ones are looking a bit ratty....

 

hey mattb you know the guy sells injectors for the 86-88 as well which I believe are low impedence and ready to drop in for you. Check out his other auctions... I am going with his injectors around spring time but I will be getting 920's


link is here
http://stores.ebay.com/TLF-performan...QQftidZ2QQtZkm

 

you only need to get rid of hte resistor pack PARTIALLY,

if your old injectors are low impedance and you ended up purchasing high imp ones....

the old injectors will still need the resistors to work properly , just the new ones would not.

 

well...the last 4 digits of my vin are 7927 making my car an 87.5 meaning i already have high impedance injectors....or so i think

 

All this confuses me. I can never remember which is high and which is low impedence S4 or S5. Clear this up please. I am pretty sure S5 is High impedance so now resistor will be needed for 720s right? I am laughing at myself for never being able to remember this.

 

up to 87 is low impedance, but halfway through 1987 mazda changed them to high impedance removing the resistor pack....making the 87.5....then from there on out it was all high impedance.

all ECU's want to see high impedance injectors, but with the older rx7's they had a resistor pack to make the ECU think they were HIGH impedance.

 

after what number did the FC go to 87.5? mine is 6187, would mine have the high impedance injectors? I'd check for the resistor pack, but my car is in indiana and im on vacation.

 

where is the resistor pack located?