Best fuel injectors 4 KA24E

[SxMachine]

Well my fuel injectors are pretty much shot (clogged beyond repair) and instead of cleaning them on constant basis i'd rather just replace.  Any suggestions on what 2 use for my stock KA or should i just risk buying 4 more from a used parts dealer.  I'd much rather go performance than stock anyway.

[uiuc240]

when I had my KA24E, I bought Python injectors. They worked fine. Don't remember where I got them though.

www.google.com

Eric

[SxMachine]

550cc?

[90240ka]

you do not want to exceed the stock fuel injectors, if your engine is totally stock, then just buy some new OEM injectors or remanufactured ones, Ijust bought remanufactured ones, I spent 400.00 dollars on them but it was worth it. I was thinking of getting some performance injectors until I read a thread on here that your fuel will run to rich. I wouldnt get 550cc one till you go turbo. (that is if you go turbo)

[GlacierFreeze]

Maybe I'm wrong, but how would you run rich with bigger injectors? That just allows you to inject more fuel, I don't see how you would run rich. And even if you did run rich, your O2 sensor would detect it and correct it by giving less fuel. Correct me if I'm wrong.

[d240t2]

Under WOT or above a certain RPM, the ECU goes into open loop mode. In open loop mode, the ECU no longer monitors the O2 sensor, it just goes off of MAFS voltage to determine the amount of fuel to deliver.

That said, if the ECU thinks it has 270cc injectors, and really it has 550cc injectors, it will put out way too much fuel. It'll see a certain amount of airflow, determine how much fuel to give, then translate that to an injector pulsewidth to determine how long to open the injector.

The step where it goes from how much fuel to how long to open the injector is calculated from injector size. to keep the math simple...if it thinks it has 270cc/min injectors, and it wants to dump 270cc of fuel, it opens for a minute. Now, if you have 550cc injectors, then in that minute that the injector is open, it'll dump 550cc of fuel, not 270.

And even in closed loop mode (where it monitors O2 sensor voltage and changes fuel curves), I would bet that the ECU would throw a code for O2 sensor not responding with that large of injectors. What I mean is, with injectors that large, it'll be way rich. The ECU will drop fuel back a small amount...and it'll still be way rich, so the O2 won't respond. The ECU will try again and again, but the O2 sensor voltage won't be significantly changed by small fuel changes...and the ECU will assume that the O2 sensor is bad and not responding...not that the injectors are way too big and it needs to dump half the fuel it was planning.

In closed loop mode, it still calculates where it should be from MAFS voltage, then it alters it slightly based on O2 sensor voltage. It doesn't base its calculations strictly on O2 sensor voltage.

Dennis

[SxMachine]

I meant 270cc i keep forgetting i have a ka24e.