370cc injectors in Ka24e, SAFC II hook up...HELP!!

[Tx-Sx-FS]

i have the injectors but wondering what needs to be done for them to run the same...like one is high impedence and the other is low...so what size resistors do i need? and the SAFC, how do i hook that up (what wiring is needed, cuz i bought one and it only came with the wire from side of unit..but no other wires..do i need those??) Thanks

[s13sr20chris]

i moved this to the ka forum because i really have no idea

[Tx-Sx-FS]

well any help on hooking up SAFC on ka24e...is shows that i need to wire it using the N-3 diagram..but i cant find it...help

[JNM240]

I dont have the diagram for the SAFC but i do have the diagram for the 90 ECU pinout. If you could tell me what the wires need to go to (like which is MAF, which is injector, ect), i could tell you where on the ECU harness they belong.

And as for your injectors, i believe the only way to get them to work properly is to remap your ECU to handle them. BTW, where did u get them? What brand? How much? Do you happen to know the stock injector cc's?

[Tx-Sx-FS]

well the diagram shows 89-94 i believe..so they should be the same...its the World N3-B diagram, but the manual only shows a N-1 diagram...the stock injectors are 270cc low impedence and the 370cc are high impedence...i need to know what size resistors to use so that i dont fry anything when i just them in.

[Tx-Sx-FS]

well the diagram shows 89-94 i believe..so they should be the same...its the World N3-B diagram, but the manual only shows a N-1 diagram...the stock injectors are 270cc low impedence and the 370cc are high impedence...i need to know what size resistors to use so that i dont fry anything when i get them in.

[slipnfall]

Someone please correct me if I'm wrong, but I don't think you will need to add any series resistors to your injectors. This is not to say that they will work! If what you say is correct, that the stock are low-impedance injectors, then you *should*(no expressed or implied warranties!) not have to worry about blowing anything in the ECU.

When putting low impedance injectors in place of high impedance ones is when you would need the addition of the series resistors.(for simplicities sake, you can think of 'impedance' as resistance in this case). Trying to put low-impedance injectors in place of highs(w/out resistors) *will* cause ECU damage due to excessive current draw from the injector drive circuitry. The resistors serve as current-limiting devices.

The only way to lower the impedance is to place the resistors in *parallel* with the injectors, but I'm not sure how well this theory translates to the real world.

Hope I didn't cloud things even more. Are these SR injectors? Top or side feed?

-Jamie

[onosqv]

I dont have the diagram for the SAFC but i do have the diagram for the 90 ECU pinout. If you could tell me what the wires need to go to (like which is MAF, which is injector, ect), i could tell you where on the ECU harness they belong.

And as for your injectors, i believe the only way to get them to work properly is to remap your ECU to handle them. BTW, where did u get them? What brand? How much? Do you happen to know the stock injector cc's?

Hmmm... Is there a knock sensor wire?

I got my hands on the ECU diagram for my car, I think it's good, found from searching on this forum.

However, I've tried reading the darn thing, and it's confusing. Some of the pieces, like air-flow meter and throttle, have multiple wires going into the ECU and I don't know which wire to tap into. Well, I eventually found most of them with the SAFC diagram, but even then took some trial and error.

Anyway you can send me your diagram so I can see if it looks the same as the one I have (I don't think I have the factory one, but not sure).

[Tx-Sx-FS]

Hey if you have the N3-B Diagram then send it to me too at [email protected] im still researching to make sure my injectors are low and that the new ones are high so i dont need resistors.

[InsanityInc]

If the old ones are low and the new ones are high, I don't think it'll work right. The ECU probably won't supply the proper amount of voltage to give the injector an idea of what it's supposed to be doing.

[w1ngzer0]

If the old ones are low and the new ones are high, I don't think it'll work right. The ECU probably won't supply the proper amount of voltage to give the injector an idea of what it's supposed to be doing.

makes logical sense to me but i don't know the difference between the 2.. ^^;

[Tx-Sx-FS]

the ECU wont know theres a difference...ill be using a SAFC to tune that part...but i just need to know if the power supply to the new ones are less or more so i dont fry the wiring...thats why im asking if there are some resistors that i NEED to use.

[Toahk]

And stock single cam injectors are 270 High impedance top feed, if you have the sr those are 370cc low impedance side feed. you will need resistors and a modified fuel rail to run them on your single cam.

[Tx-Sx-FS]

thats just it..im gonna be using the CA18DET 370cc Top Feed injectors..so no modifing the fuel rail..just need to power ohms for my car and the CA...

[Toahk]

well the diagram shows 89-94 i believe..so they should be the same...its the World N3-B diagram, but the manual only shows a N-1 diagram...the stock injectors are 270cc low impedence and the 370cc are high impedence...i need to know what size resistors to use so that i dont fry anything when i get them in.

I was replying to that... If you say that the ca18's are high impedance 370cc top feed, wont they just bolt right in?

[Tx-Sx-FS]

but im not sure if the CA's are high or low...but do u know what the SOHC KA's are?? your helping me alot..thanks

[Toahk]

Ok just found out, stock ca18det injectors are 370cc low impedance, top feed. Stock Ka24E injectors are 270cc high impedance, top feed.

Edit, 370's are actually high impedance with a resistor to make them low impedance. Just remove the resistors and jumper the wire where it was.
Modified by Toahk at 6:17 PM 10/3/2004

[Tx-Sx-FS]

could u possibly give me an idea of the resistor needed...where to get...how much?? if you can actually send me a link that has them, that would be great...please...thanks

[Toahk]

Look at my above post.

[Tx-Sx-FS]

i realized after that i saw ur post...but can u give me some advice on the resistors??

[onosqv]

i realized after that i saw ur post...but can u give me some advice on the resistors??

I believe he is saying you only need resistors when you are trying to go to low impedance resistors.

The CA injectors are high impedance if you don't use the wire (which contains the resistor to make it low impedance).

So basically, I believe it is just plug and play.

KA24E - high impedanceCA18 - high impedance w/o the wiring

[Tx-Sx-FS]

thanks so much..now i can put them in and tune with a SAFC...sweet

[OP240sx]

where did you get your CA injectors?

[Tx-Sx-FS]

i got them from someone off this site..just look around and youll find someone selling them..i think someone is selling some on here now.