370cc injectors good for Stage I?

[AZhitman]

Just bought a set (local 240 owner), need to know if there's anything I need to do with them before installation.

Also, can I go ahead and install them or will they function differently on my KA without boost?

[MarkEmark]

Just make sure all the injectors have the pintle caps on them, and order a new upper/lower fuel injector O-ring set from Nissan (your dealer may have them in stock). They drop right in the KA fuel rail so just tell the guy that you have KA 270cc fuel injectors--both SR and KAs use identical o-rings.

If you want, it's always a good idea to have them flow-tested/serviced by a place like RC-Engineering, but it'll probably cost you just as much as the fuel injectors themselves, but it adds to the peace-of-mind factor.

So the short answer: they'll drop right in, just make sure you get new o-rings for them.

But no, you cannot go ahead and install them unless you have an S-AFC or an ECU (JWT) tuned to handle them.

Hope that helped, and welcome to the KA-T side of the forums

[virus77]

C'mon hitman, you of all people should know to use the search function, hahaha just kidding. You need some sort of fuel management to be able to run larger injectors, unless you are turbo I'd hold off on the installation, stock ones are fine.

[Jookmasta]

hey if they dont have the pintle caps, are they still functional? and this pintle cap is the plastic cap covering the bottom of the injector correct? i planned on sending my injectors out to fuel injector clinic either way but i just want to make sure.........

[D Money]

I put my 370s in a few weeks before installing the turbo system and all i did was put -30 across the board on the afc. Ran just like it did stock, but of course u need the afc.

[Jookmasta]

thanks for the info crazy; im thinkin of doing the same thing as my safc is already in the car and running. when u say -30 u mean even thru hi and low throttle correct?

[MaxType 240]

Make sure you lube the o-rings prior to install. I didn't and my o-rings ripped apart...

Jesse

[coolcloo1019]

hey if they dont have the pintle caps, are they still functional? and this pintle cap is the plastic cap covering the bottom of the injector correct? i planned on sending my injectors out to fuel injector clinic either way but i just want to make sure.........

also wondering the same thing...

[crzycav86]

Make sure you lube the o-rings prior to install. I didn't and my o-rings ripped apart...

Jesse

When lubricating the o-rings, a mechanic suggested that I use a certain type of grease, not regular motor oil, because it allows you to easily remove the injectors(if you've removed 240 injectors before, you know how tight these get). I think it was called "transmission something lubricant". It was a red translucent grease... but I think any kind of grease would work too. It's not the best idea to lube it with motor oil.

[WDRacing]

Your supposed to use a petroleum jelly, like vaseline to lube the orings.

[C-Kwik]

And do buy new o-rings. Contact with fuel makes the o-rings brittle and they tear quite easily upon removal. And they can tear even more when trying to reinstall them. New ones with a bit of petroleum jelly should leave the o-rings in good shape when you install them.

[AZhitman]

These are already in the rail (bought the whole shebang), so I'll guess they're gonna be fine.

Or should I remove them and rebuild the rail with new o-rings for each injector?

[WDRacing]

Remove the injectors since the orings are probably all dry rotted by now. Then replace the orings and install them with a bunch of PET on the rings.

[PapaSmurf2k3]

petroleum products (vaseline, wd-40, gas, etc.) usually eats rubber o-rings, maybe injector o-rings are different, but I used paintball gun oil for mine, its a synthetic specially made to not screw up, or eat o-rings. I decided this was the right way to go after I found out how hard it was to get the old injectors out

[PapaSmurf2k3]

oops... I just realized I brought up an old thread... sorry.

[WDRacing]

petroleum products (vaseline, wd-40, gas, etc.) usually eats rubber o-rings, maybe injector o-rings are different, but I used paintball gun oil for mine, its a synthetic specially made to not screw up, or eat o-rings. I decided this was the right way to go after I found out how hard it was to get the old injectors out

Gas is a petro product...so the orings that hold the gas in should be fine when lubed with another petro product...lol.

[KATwo40]

I used wheel bearing grease on mine. They popped right in without drama.

[Porn-Adkt]

why would you need to run a Piggy back or Tunned ecu if your only replacing injs. The ecu controls flow not the inj. since ther is no forced Ind. and ony inj size is increased the same signal would be sent to the inj. flowing the same amount despite its flow. this is untill you introduce the turbo ofcorse, then yes you need some sort of controller.

correct me if im wrong

[hannibal]

The ECU controls flow by telling the injectors when to open and close. The amount of fuel delivered in that period is based on how large the injector is.

You have to tell the ECU youve got bigger injectors so it can shorten the length of time it tells the injector to open. If the ECU doesnt know youve got bigger injectors, they will add too much fuel before the ECU tells them to close.

[KATwo40]

Also, don't forget that ading the SAFC (even without boost) will cause your timing to be slightly advanced, since the ECU still reads part-throttle airflow, despite being WOT. A couple or three degrees retarded should be fine.