rb20det fuel injector part number

[Lozer]

I currently have a48-000001 (dark redish in color) injectors in my rb20det and i have a sneaking suspision they are much larger then the stockers (still running rich and ive replaced and screwed with every possible culprit)

at any rate can anyone identify the part number?

[Yellow4g63]

If you have a walbro pump no aftermarket FPR then the car will run way rich. The stockers are 270cc. Also if it's leaking prob bad orings or leaky injector.

[Lozer]

Nismo Afpr set up to stock pressure. I checked for leaks yesterday using a snap-on fuel pressure gauge and there were no leaky injectors as the pressure held (clamped both hoses after system was charged up) until i released the clamps. Have checked for boost leak using a smoke machine and a home made leak tester and cant find any leaks.

So it's either non stock injectors or the ecu is tweaked. (checked the coolant sensor and the maf and both are within spec)

So anyone wanna check out there rb20dat with stock injectors and tell me what color they are?

[Carl H]

stock injectors are also a darkish red, but more akin to the sohc ka injectors (same injectors).is there another part number on there you can post up?might be the rx7 550's...

[DRFERO]

as far as i knew rx7 injectors are yellow 440cc?? maybe theres differnet ones tho...and for the guy who said a standard reg and walbro 255 lph fuel pump will make it run way to rich needs to learn how a fuel reg and fuel pump works...u could put a 1000hp pump in it with stock fpr and it still wont run too rich....the purpose of a big fuel pump is to supply the fuel rail with a constant high pressure feed of fuel......it wont inject more fuel with stock regulator cos all the excese fuel that u didnt have with the standard pump will go through the regulator back to tank...hence y its called a fuel pressure REGULATOR cos it regulates the fuel to the exact pressure its set to...on the other hand if you have a rising rate regulator that will richen up the fuel according to the rate wich it rises at....and if you have an adjustable regulator it will adjust the pressure inside the fuel rail and if u have the pressure set more than standard on standard injectors then u will start running more rich...thus f***ing the injectors in the process....

so basicly if you have a nismo afpr y dont u just down the fuel pressure to stop it running so rich???

[DRFERO]

oh and just to add if you were running a 550cc injector at 45psi fuel pressure ud b running way to rich ud be bore washing..if you had 550cc injectors ud neada b on about 20psi at a guess to make it run mint

[Lozer]

Well for me i like to fix problems and not put band aids on them.

The only other numbers i found on the injectors are 5L81 08-06what would be a sign of bore washing?

[DRFERO]

downing the fuel pressure is not a "band aid" for ur car...obviously its running to rich so the way to make it run stoich is to down the pressure...common sence really....get the a/f tuned on a dyno and ull be done

[Carl H]

^ that is the worst advice ever.you do know that for proper atomization the rail pressure must be @ 43.5psi to allow for a proper spray pattern.messing with the fuel pressure to correct for a possible miss-size of injectors is a hackjob fix.period.

[DRFERO]

yes 43.5 psi for the standard injector u nob...get ur facts right.each injector has a different pattern and all injectors have different pressure ratings for atomisation

[Carl H]

is that so, if i am indeed wrong then please do educate me.i guess the fact that any and all modern injectors are TESTED at 43.5psi and rated at the same pressure rating (excluding domestics) that i guess the number is irrelevant and that you can just set the pressure to whatever you damn well please.turning down the rail pressure is backwoods tuning, end of story.do it right or go home.

[DRFERO]

ok....so say im running some huge injectors in my rb20det.....the only way to make it run is to down the pressure.............

[moso240]

ok....so say im running some huge injectors in my rb20det.....the only way to make it run is to down the pressure.............

WRONG....U would get your car tuned for those larger injectors....

[Carl H]

^ what he said.i run the greddy/denso 720cc injectors on my car...by your tuning methodology i should be running like 15psi rail pressure to compensate when the reality is that I tuned the stock ecu to run the 720's and the car runs flawlessly (with 44psi base pressure!).i even had the injectors cleaned and flowtested about a year ago now and guess what, they were tested and rated with 43.5psi pressure.

[DRFERO]

yes its running with a tuned ecu cos urv shortened the injector pulse AYE!!!!! im talking stock ecus u dork

[Carl H]

look man i dont like your attitude but either way, stock ecu or not turning down the fuel pressure is a piss poor way of compensating.hell an safc would be better than dropping the rail pressure, not a great fix but atleast the injectors are running at correct pressure.again do it right the first time or go home, who buys large injectors and just turns down the fuel pressure to make them work...thats silly and hackjobish at best.

[Lozer]

Im gonna go with Carl here. and try to get back to the point.

The only other numbers i found on the injectors are 5L81 08-06 are those the sockers or ?

Im not going to turn down my friggin fuel pressure and even run a risk of running lean. You sir give bad and possible dangerous advice. All it takes is running a little lean up high under full bost and POP no more piston. So please in the future when you decide to give uninformed or imagined advice please put in a disclaimer.

For instance start the sentance with "im not sure but would turning down the fuel pressure work." That is my free and not dangerous advice to you.

[Sil240]

Drfero- I see that your new here.You seem to think that you know everything.You have a big mouth and talk shyt when you don't know shyt.

I find it kinda funny that you wanna call someone a Noob, when that is exactly what you are.

I don't play that Bull-shyt Noob game.I respect everyone wether they no everthing (legitimately) or know nothing.But I have NO respect for a D-bag that comes mouthing off to very knowledgeable and valuable members here.

STOP SPREADING MIS-INFORMATION.

I hope the Mods delete all of your posts before some "Noob" that actually is trying to learn something comes reading your posts.

I hope you blow your shyt up with your ghetto, backyard tuning. Take that BOV off, turn down your fuel pressure, turn up that boost. GO AHEAD!!! Have fun with it.

[Lozer]

All i wanted was an injector confirmation or p# but i got advice on how to properly lean out my motor.

So mr drefero

[Carl H]

^ lol.

to the OP...the numbers you posted dont make sense; well atleast dont look like denso or jecs pns...can you verify the numbers again please?

[cdorhout]

First, why would someone buy bigger injectors if their goal was to run like stock on a stock ECU? If you lower the rail pressure, you will see no benefit to the $800 you just dropped on new injectors.

Come on dude, admit it, you know this is dumb right? You're just messing with us?

[Lozer]

ill go check again but they are jecs (says so on the side) says made in japan on the other side (go figure)

a46-000001 (or a48 but it looked like a 6 this time)5L31 (little band looks like a chevy bow tie) 06 08 wraping around the top of the injector where the fuel line comes in.