Injector question, please.

[KATwo40]

I have an opportunity to pick up six 1,000cc/min Precision top feed, low impedence injectors for very cheap.

I understand that the injectors would be capable of much more than my 425whp goal, but I'm wondering...would there be any actual adverse effects to running such a large injector? At peak power, the injectors will be operating at around the 60% duty cycle range.

I figure, if I have fuel spray issues down low (at idle and such), I could bump the base fuel pressure up and reduce the pulsewidth, resulting in more atomization.

Any input is MUCH appreciated.

Thanks!

[LEMHEAD16]

Hell, if it is really "Cheap" buy them and sell them so you can make a profit and get the right injectors for your set-up.

Sorry I can't offer technical advice

[SeanC]

with the right tuning platform you could get them to idle like butter!

[KATwo40]

I can adjust injector latency, correction tables and K value...so I think I'll go for it.

[C-Kwik]

Might be an issue at idle if the minimum duration provides too much fuel to idle correctly.

[KATwo40]

Might be an issue at idle if the minimum duration provides too much fuel to idle correctly.

This is exactly my concern. I've heard some say they can PW low enough to idle very smoothly around 900rpm (which is where I like my idle anyhow...that 750rpm crap sucks...too lumpy, even on stock KA's). Then, some say these injectors can't operate below 20% duty cycle, and I'm not really certain how that will translate. I know the Honda guys commonly use 1,000cc injectors on 1.8 and 2.0 engines with smooth idle, so I think I might go for it.

[Florida240sx]

Beefy ignition system...

[KATwo40]

Hardwire the stock coil...that's gonna work just fine for me.

[C-Kwik]

From what I gather, it can vary with injectors. I would probably try to find out the min duration on hem or at least see if anyone else has been able to use these injectors and idle at a reasonable low RPM smoothly. Let us know how it turns out if you try it though.

[steve s14]

when running a really big injector on a non staged setup, the injector pulse duration at idle becomes so brief that it's hard for the injector to accurately meter the fuel.running a standalone can fix some issues but it can only do so much.the problem is due to the injector itself. the pintle that seals the injector orifice has a certain amount of mass that is moved when the injector energizes. there is what is called "dead on time" or " invalid time" which is the time that the injector is energized but no fuel is being sprayed because the mass of the pintle is being overcome enough to move it open. generally pintle type injectors don't react consistantly when it's supposed to open and close in less that 2 milliseconds.lucas style injectors can open and close quicker due to the design.hope that helps.

[KATwo40]

Yes, I understand injector latency and the problems that might occur with the larger injectors.

I'll still be running sequential (stock) firing down low, so that might help a little.

I think it'll do just fine. Many Honda guys run 1,000+cc injectors and those weedwackers idle pretty well in the 900rpm area.

Thanks again for the help from everyone. I'll be certain to keep ya'll posted on it.

[steve s14]

i'm running 810cc injectors and my idle is rock solid so if you were asking for opinions based off of personal experience, i would guess you should be ok.

[KATwo40]

That's exactly what I'm after...real life experience with large injectors.

Thanks for the help.