Need a set of injectors

Since I lost one injector, I'm anticipating that the others will begin to fall one by one.

I'd rather just put new injectors in (vs. used) though might consider "slightly" used.

Question is... For NA, any reason to go with 555's or just stick w. 370's?

Steve

i thought the n/a injectors were 259cc?

Oh lord, what a noob. I think you're right... Over 8 years with this car and I never knew that...

Nevermind... My ASHspec ECU has the '270' circled so I'm guesing I would have to change my ECU to work with larger injectors and I don't know why I would want to anyway.

I guess I'm thinking if I find a "slightly used" set of 370's I would drop them in but it doesn't sound like a good idea now.

weeeelll i recommend the 740's because there cheaper or were cheaper than the 555's and they really can make a huge diffrence too I didnt notice i fuel economy diffrence but honestly the car wasnt running perfect when i got them either. I only recently slayed the grimlens

But don't you have to change your ECU mapping?

^yes, you do. for any injector size change you'll need to. and i've heard there's no point in ever getting anything larger than stock size injectors on an NA. TTs are obviously a different story. so stick with 270s . i've asked about 370s too but apparently there's absolutely no benefit whatsoever.

well i would have to agree with stephen about the injectors, my dumb self didnt think about the NA idea. That is unless you decide to raise your compression. I assume it would not hurt to raise to 370's.

As for ECU mapping you would have to get a chip for the larger injectors same if you were to switch to doolz intake or go say from automatic tranny to manual FYI

Thanks for the help, guys. I'll just start looking for some good stock 270's and when (if ever) I pull my plenum I'll just change out all my injectors at once along with the water line and EGR delete.

good call man...nothing to add

I was going to say that there is no real benefit to upgrading to larger injectors on a non turbo Z unless you have did a great deal of internal work to the engine IE high compression pistons "11 to 1 or higher" and high lift cams and or running nitrous oxide. In either scenario this would prevent you from leaning out your air fuel ratio and having catastrophic failure as a result of detonation..

I do have a set of 6 early stile injectors in good condition still in the rail if you still need them let me know.

I thought I had the later "pintle-less" injectors? Would a pic help?

OOPS ya forgot you hade a 93 2+2. 90-92 NA and 93 verts had the old stile injectors. I do know someone who has a few good later stile ones.

Just picked up 4 good later stile NA injectors all of witch tested at 11.7 ohms. Let me know if will need any or all of them

What's the age on them? Even if they ohm out OK, I'm still suspicious they will fail if they've already been in use for 10-15 years...

For what its worth Z that they where pulled from was a 93NA and had just a little over 100K on the clock however injectors are a rather funny evil. I have personally seen injectors fail both new and old stile OEM and Nismo within a year or less. I have also worked on a 91 2+2 This was a one famly Z till only a few years ago when it was sold. It hade over 250,000 miles on it and it still had the original engine and the owner told me the only things he hade to replace outside of the normal maintenance was the clutch a few times and upgraded to a 1 piece drive shaft when the carrier bearing when out.

I think that all electronics based parts can be held to somewhat of the same standard as injectors IE the MAF, O2 sensor, solenoids, ect. Take this for example a little over a year ago I did a large amount of work fro Read "fairladyaffair" during his build I tested his injectors when the engine was out and everything came back normal and once he got his babby back he was very happy. No more then 2 months after he got it back he hade one or two fail out on him. Just an additional testament that gremlins are not fictional creatures and they live in are Z's

Yeah, coming from an electronics background I understand mean time between failures and also anomalies between samples. Injectors are probably pretty simple devices in reality, but I'm thinking if mine all came out of the same "lot", then they all have approx the same life expectancy and now I have an indicator that it's not as long as I would like.

PM me with a price on the 4 you have.

Motor ran fine for a few weeks after getting the injector replaced, but now I have intermittent stumbling at low RPMs and I can feel misfires while holding constant RPMs (interstate driving).

Any ideas on what could be causing intermittent misfires? This is more frustrating than a dead injector which at least you can pinpoint to a specific cylinder. An intermittent misfire is, well.... intermittent (man I'm eloquent).

Steve

Injector #5 has now failed.

i think the best bet is to replace all at once.

i did one, cleaned all contacts and it ran great for a week than they all went out 1 than 2 at a time nissan did a fuel system cleaning on the car i do not recamend a fuel system cleaning at pine belt nissan in toms river nj

ran good till they did 120k mile service on car screwed it all up,,

parts of the oil pump were busted off from them changing the front main seal the peaces were sitting in plastic pan with screwdiver indents on the busted peices, massave oil leak caught late cause my mother used the car once a week.

well it turned out to be a plug vs. injector. I got in there and before removing the injector I ohm'ed it out and it read 11 ohms so I figured it must be something else and found the bad plug. I have 83K and never replaced my plugs so now it's time I guess.

If I do have any more injectors fail, I am going to remove the plenum and do them all, plus do the water line and EGR deletes and put on a plenum I have in my garage that I'm going to polish up so it will be ready to swap in when I need it.

dammit man, your car is telling you that it wants to be swapped to a twinturbo so you can switch to a newer type of large injectors.. :)btw stay away from ethanol supplied gas stations if you can,

Blacktwin wrote:

dammit man, your car is telling you that it wants to be swapped to a twinturbo so you can switch to a newer type of large injectors.. btw stay away from ethanol supplied gas stations if you can,

No doubt on both counts! I really hate driving in VA and SC... At least they are keeping ethanol out of NC pumps...