MaxinO2

iTrader: (1)

Sorry I can't find answers on this but can the 6th gen injectors be used on a 5.5 gen? I have injectors off an 07' Max that I would like to use on my 02'.. looks like they have different part numbers at Courtesy Parts but I wasn't for sure if there compatible.

MrEous

iTrader: (11)

Yes they're compatible.

Rods03Max619

iTrader: (5)

I agree with ^^^^^

MrEous

iTrader: (11)

VQ35 for the WIN...FWD or RWD they all fit

ShocknAwe

iTrader: (3)

100% positive on that? Even the different years?

TunerMaxima3000

iTrader: (4)

Fit yes, same, maybe not.

gtr injectors fit. They're not the same though. ijs.

MrEous

iTrader: (11)

They all 'fit' without issue. Same clips too.

Z/G injectors flow better at 3.5 bar. (330cc?)
GTR injectors flow a LOT better. (570cc)

Quickywd01

iTrader: (16)

'03 SVT Cobra Injectors FTW!

MrEous

iTrader: (11)

Needs a footnote*

*splicing of wires necessary

nishfish871

iTrader: (5)

THIS!

Are you using them?

NmexMAX

iTrader: (22)

Anything wrong with your current injectors?

Quickywd01

iTrader: (16)

Yes. They are factory performance injectors from a supercharged engine. I bought mine used on a forum after a few days of searching and holding out for a decent price, I paid about $10 shipped ea. for 8 since it comes from a v8. I spent another $140 on sending them to get flow tested and rebuilt. You need specific o-rings and an extra washer under each fuel rail bolt because they are taller but they fit and it's a great way to get "new" performance injectors that flow a decent amount. I have an old vq30de but swapped over everything 5th gen complete '00-'01 VI the intake manifold having generous gains and less heat soak it helps for forced induction and especially extended rev limit although the fuel rail is now for me the same as all the new vq35s etc so I can run any injector from a vq30dek vq35 svt cobra.... You can buy aftermarket performance injectors if you have a bigger budget, I had to allocate the funds elsewhere so I did the best I could for a couple hundred.
http://forums.maxima.org/5th-generat...-write-up.html
And if you want to know how they work and why they work and extended information about our fuel rails http://forums.maxima.org/supercharge...injectors.html http://forums.maxima.org/supercharge...ctor-help.html

MaxinO2

iTrader: (1)

I've got a PO304 and P0300 random multiple misfire, I changed the coils out several times thinking that was the issue and the code keeps popping up.

Maybe its not my injector though, because I just realized I forgot to put the plastic O rings that seal the injectors when I swapped engine's. I'm going to fix this today..

So it should be fine if I go ahead and swap 1 injector from the 07' engine and the other 5 stay from my 02 engine? I only have 5 injectors from the 07 so I wouldn't be able to do all at once.

NmexMAX

iTrader: (22)

Yup. That will be fine.

MaxinO2

iTrader: (1)

Good stuff.. The injectors are swapped and the car is working excellent, such a big difference with the injectors off the 07' Max.. I didn't test the injectors but I do believe bank 4 was bad and maybe some others were on there way too. I also had the power steering pump belt a little too tight which I felt was causing some resistance to the engine.

One thing I noticed when comparing the 07' and 02' injectors was the inlet on the 07 is larger.. Looks like it would flow much smoother and thicker than the 02'. I think I'm going to find one used 04-08 injector to match my other 5.

This is pretty funny, I went for a test drive after the swap with my friend down a back road, we launched the car off the ground.. Neither of us were wearing seatbelts and smacked our heads against the ceiling. Not sure how high we got but the car surprised the crap out of me.

Thanks for the good feedback..

RR5

iTrader: (6)

You have 5 injectors from the 07? I hate asking but why not buy a new or even better salvaged injector from an 07? From car-part.com

nishfish871

iTrader: (5)

I have the injectors (sitting), just wasn't sure if anyone else is actually running this injector. Waiting for a wiring harness to chop up with the new pigtails.

TunerMaxima3000

iTrader: (4)

Why on earth run an injector that requires modification when we have a surplus of direct plug and play options available? I don't get it?

Especially when you can get the plug and play ones for under 200 usually.

nishfish871

iTrader: (5)

I have not seen any 440cc's go for under 200. Link me to a pnp one that is around 440 - 470cc.


EDIT: Oh crap...
http://www.ebay.com/itm/Nissan-2003-...7328f0&vxp=mtr

Rods03Max619

iTrader: (5)

DAMN Good price....

nishfish871

iTrader: (5)

Looks good but no details on the brand...kinda fishy

RR5

iTrader: (6)

Plus no buy it now, do people even bid on ebay anymore?

MaxinO2

iTrader: (1)

I don't anymore.. most everything is buy it now.

TunerMaxima3000

iTrader: (4)

There's tons of 300zx tt, skyline gtr, all the way up to the new gtr injectors, the later can be had brand new for around 250.

There's nothing wrong with going a bit bigger as long as its a nice spray and good quality. The gtr ones are 570cc.

IM sure there are a lot more options for PnP also

MaxinO2

iTrader: (1)

With the mods I have are there any advantages with swapping larger injectors. If so what AFR tuning?

MrEous

iTrader: (11)

Iirc, stock injectors are good for upwards of around 270(?)whp...which I don't think you're at yet. Someone correct me with that whp # though.

Are you planning on adding more mods?...like headers, 3"+ intake, or other things?

TunerMaxima3000

iTrader: (4)

You need injectors when you exceed the duty cycle of the ones you have. This can be calculated, I'll try and digg that info up.

TunerMaxima3000

iTrader: (4)

ROUGHLY:

Injector Flow Rate (cc/min) =

Engine HP x BSFC(0.50 for N/A) x 10.5
_________________________
Number of Injectors x Injector duty cycle (0.8)


You can reverse this to find out approximately how much HP each injector size can handle:

Inj size (lb/hr), 31.25 x inj duty cycle (0.8) / BSFC (0.50)


EXAMPLE, using HP/Injector formula, because we have no idea how much power you are making:


Inj size 25.71 (270cc) x 0.80 /0.50 = 41.14 HP/ Injector

41.14 x 6 = 246.82 HP

It's not perfect, but roughly you can tell that 270cc Injectors are good for about 245 HP in a Naturally aspirated V6
Once you go past 245 HP, the injectors will go past 80% duty cycle.
Once you get past 100% duty cycle you will start running lean because the injectors cannot supply enough fuel in the designated time.

If you want to know the peak HP a 270 can push, you use 1.0 instead of 0.80 for your duty cycle. That would equate to:

308.52 HP before you completely max out 270cc injectors.

ALSO:

New style, smaller injectors:

VQ30DE injectors 259cc @ 3.0 BAR
VQ30DE-K injectors 290cc @ 3.0 BAR (FBJC100)
VQ35DE (Maxima) injectors 290cc (315cc @ 3.5 BAR) (FBJC101)
VQ35DE (350Z) injectors 310cc (335cc @ 3.5 BAR) (FBJC100)
95-96 TT 300ZX, 370cc
94-96 NA 300ZX, 320cc?
S15 Silvia SR20DET 480cc
NISMO 16600-RR543, 555cc
NISMO 16600-RR544, 720cc
Nissan GTR injectors 570cc

TunerMaxima3000

iTrader: (4)

The actual fuel rate changes depending on your fuel pressure.
Keep that in mind.
All injectors are marked at the 'standard' 3.0 bar (43.5 PSI)

For instance, the DE-K uses 290cc injectors, with fuel pressure at 3.0 bar.
The 02/03 Maxima uses approx 290cc injectors also, but uses a higher fuel pressure of 3.5 bar (50 PSI)
This means that the 02/03 Maxima injectors are actually effectively 315cc injectors because the fuel pressure is higher which allows them to flow more fuel

MaxinO2

iTrader: (1)

So the injectors should only use up to 80% of there rate and should never exceed this due to power consumption? I'm not good at math what so ever but makes sense.
I think I'll stay with what I've got until I get headers and 3". This has been on my list for quite some time now.

TunerMaxima3000

iTrader: (4)

When engineers or aftermarket 'tuners' specify the injectors, they calculate it so that the engine should never exceed 80% duty cycle on the injectors. That's why the calculations are for 80%. Engineers making the engine probably use even lower numbers.

This leaves a nice safety net for various things, mainly for us guys who want to breathe some power into the stock system.

Your stock injectors with all engine parts, etc in stock form should NEVER see more than 75% duty cycle, ever. And even less likely see 80%.

I think your choice is right to just leave them. There's really no need until you get quite a bit deeper down into performance on this thing. It's quite a feat to pass 300 WHP N/A on this engine, let alone more than that. Not that people haven't done it, but it's no where near common without Boost.
ALSO it should be obvious after my postings that switching to 350Z injectors is pretty much pointless, they're basically the same size already.

Also Mr. Eous seems to be fairly accurate. I did the calculation for the stock 2002/2003 Injectors at the 3.5 Bar pressure.

Max HP at 80% Duty Cycle is = 288

BUT, I'm PRETTTTTY sure that is AT THE FLYWHEEL. IF this is true, then you can only push those injectors to:

Average drivetrain loss is about 13%
288 x 0.13 = 37.44
288 - 37.44 = 250.56 WHP

Something I should've thought of earlier, sorry. Unless I"m wrong, those SHOULD be at the Flywheel calculations. So you need to do the old 13-15% drivetrain loss guestimation to get the REAL number.

nishfish871

iTrader: (5)

Glad the math is there to backup why stock injectors can just barely cope full bolt ons. hopefully the 470cc injectors will make a difference on my fully bolted n/a car. I have a feeling the injectors are a restriction that is looked over.

TunerMaxima3000

iTrader: (4)

I was kind of surprised to pull those numbers also. Then again that's 80%, so...

250.56 x 0.20 = 50.10
250.56 + 50.10 = 300.66 WHP

While you should never really look at that 300 WHP number because of 'safety', that's the ACTUAL WHP before you hit the end for the stock injectors, that's the 100% Duty Cycle, after that the car will start running lean at higher RPM/load, which is a bad thing, obviously

So in fairness, it's pretty hard to top out the stock injectors without getting pretty deep into the engine, but it's certainly possible

MaxinO2

iTrader: (1)

Does anyone know why the injector fuel inlet off a 02' Max is smaller than one from 07'? Seems like the larger inlet would flow more gas making it slightly different.

MrEous

iTrader: (11)

Maybe just a more efficient design...

NmexMAX

iTrader: (22)

And some of us aren't running out of fuel given our hp levels, just playing with our AFC's and timing, and 4" intakes, etc.

Also, I paid over 400$ for my PnP Z33 injectors, so I do see the point of going with the Cobra, although, I'd rather shell the extra $$ so I wouldn't need to modify/splice the injector harness.

Also, physical size has nothing to do with performance. My 440's looked identical to my Z33's, and those looked identical to my OEM's, minus the color of the body.

TunerMaxima3000

iTrader: (4)

I did one of the calculations wrong, I'll check later. But on physical size making no difference.

EDIT: no i didn't, , just got confused about the WHP vs SAE HP numbers I posted.


But manny, you over paid, unless that was 400 brand new, and even then
Perhaps I'm way off, but I've seen them go used under $175 for a full set with low miles. Guys upgrade 350Z injectors like crazy

knight_yyz

iTrader: (40)

My tuner also mentioned to me that going over 80% causes the injectors to get hot. When they get hot they start to malfunction.

So does anyone know why the FBJC100's come in at least 4 different colors? Do they all flow the same or is it a manufacturer thing?

TunerMaxima3000

iTrader: (4)

^Answered in your thread.

For this thread: Colour is an indicator of application & flow.
The FBJC100 Part Number only designates the style of Injector. In this case, the TOP FEED with the Nippon Denso connector, and size (not FLOW, just physical size)

The number under that PN will be more specific, but it's easier to just go by color

knight_yyz

iTrader: (40)

This is a PITA, I can find ford color codes, but nothing for Nissan

Bright yellow is 440
Bright green is 550