Fuel Injector Options

[jlitman]

Curiously, not so much on this topic seems to have been covered. If I've missed a vital thread, pelase re-direct me ;)

I'm aware of how to calculate for fueling needs (see here (http://www.rceng.com/technical.htm) but not which injectors are known for preforming better or worse.(BTW: anyone know what the fuel pressure rate is supposed to be for the OEM fuel pump?)

Some manufacturers I know of:

1. Sard -- alleged to be quite good, and is OEM for several Japanese vehicles (or so I've been led to believe)

2. MWR -- I know they use 'em.

3. RC -- heard mixed things about them. Currently have 440's via the Greddy kit...

4. Power Enterprise - know nothing about them

5. Greddy -- same as above

6. Blitz --???

7. Apexi --???

Others?????

Recommendations on quality, reliability, better or worse atomization? Ease of compatibility with the 2ZZ? Etc .etc.

Experts, please advise :)

The reason I ask is that I'm considering upgrading, especially if I go for yet another pulley (and according to the calculator I linked above, I'm cutting it close as it is), which I probably will soon.

Then I'll have to revisit all those threads on changing the MAF, as I'm hitting 5 v now if I rev past 8K... but one step at a time :faint:

[Jesse IL]

The MWR injectors are really Mototrons. The nice thing about those is that they have the narrow body like the OEM Densos.

[youngxlos]

i got the 460cc Injectors from MWR the injectors look fine, but they didnt include the o rings so that kinda sucked

[youngxlos]

The MWR injectors are really Mototrons. The nice thing about those is that they have the narrow body like the OEM Densos.

i think only the 380cc are like OEM, but ones you go above that they get really big.
here is a pix of MWR 380cc
http://www.filehigh.com/serve/902/369171.jpg

[Jesse IL]

Nope, my 630cc's look just like that. I'd say those are Mototrons as well.

[jlitman]

Thanks for the feedback, guys!

What do you guys think about the Sard injectors? How about RC?

Is there an easy way to assure good fitment on injectors -- what are the specific parameters one should look for, or are they all pretty much universal fit?

Oh, anyone know what the OEM fuel pressure should be?

[The__J__Factor]

ive got Sard 530cc

they are made by the same manufacturer as our stock ones, had the same logo/name on the side.

They are a perfect fit, and the car started perfectly the first time, i highly recommend them.

One the down side, they only make upto 530cc i believe or at least thats all that was on offer when i bought mine.

Edit: i believe stock fuel pressure is 55psi

[jlitman]

ive got Sard 530cc

they are made by the same manufacturer as our stock ones, had the same logo/name on the side.

They are a perfect fit, and the car started perfectly the first time, i highly recommend them.

One the down side, they only make upto 530cc i believe or at least thats all that was on offer when i bought mine.

Edit: i believe stock fuel pressure is 55psi

I may get a set of those, and 530 cc should be as high as I ever need to go. No fitment issues? Just order a set of 530's, plug them in, and I'm done?

Double o-rings needed?

Good place to order? Saw a set on ebay for under $500, but I beleive it was listed as OEM for a WRX :shrugs:

[The__J__Factor]

I didnt double o ring it, just used stock ones no problems yet and its been a couple months.

also they shouldnt cost anywhere near 500 bucks!
http://www.nengun.com/sard/injectors they were AUD$400 delivered

if u sign up with nengun.com it will automatically display how much your shipping will be for each part, the site will also highlight parts made for ur car in pink so u dont have to scroll through the full list of part numbers.

Good site, real cheap but did about 4weeks for my PFC and injectors

[jlitman]

I didnt double o ring it, just used stock ones no problems yet and its been a couple months.

also they shouldnt cost anywhere near 500 bucks!
http://www.nengun.com/sard/injectors they were AUD$400 delivered

if u sign up with nengun.com it will automatically display how much your shipping will be for each part, the site will also highlight parts made for ur car in pink so u dont have to scroll through the full list of part numbers.

Good site, real cheap but did about 4weeks for my PFC and injectors

Awesome -- thanks! I will be ordering these in the near future. My tuner seemed to feel that the OEM ones were especially good at atomizing the fuel (better than the RC's), so I like the idea of going with upgraded ones from the same manufacturer :thumbup:



Hey, still a good idea to keep the discussion going -- again, not too much on which injectors are good bad or so-so around here. :wiggle:

[Celicasaur]

Do you guys reckon 530's would be more than enough for a stroker, cams, pfc etc (all n/a set up) ?

[boardernr]

I'm on mototron 630's getting the job done here :)

[jlitman]

Do you guys reckon 530's would be more than enough for a stroker, cams, pfc etc (all n/a set up) ?

Hey man,
check out this link (http://www.rceng.com/technical.htm). It has a nice calculator for estimating your injector needs.

Anyone know whether there are there any problems with running injectors that are too big? Poor idle, for example, or weird affects on fuel pressure, especially on a returnless system? At what point must the pump be upgraded to match the injectors?

[youngxlos]

ive got Sard 530cc

they are made by the same manufacturer as our stock ones, had the same logo/name on the side.

They are a perfect fit, and the car started perfectly the first time, i highly recommend them.

One the down side, they only make upto 530cc i believe or at least thats all that was on offer when i bought mine.

Edit: i believe stock fuel pressure is 55psi

I may get a set of those, and 530 cc should be as high as I ever need to go. No fitment issues? Just order a set of 530's, plug them in, and I'm done?

Double o-rings needed?

Good place to order? Saw a set on ebay for under $500, but I beleive it was listed as OEM for a WRX :shrugs:

i had to double o ring the MWR ones

[mukalicious]

yeah, i think i double o-ringed my mwr 630s. doin plenty fine on my end.

[euromotorsports]

any place online to get orings or should you just go to the dealer and get the orings?

[jlitman]

any place online to get orings or should you just go to the dealer and get the orings?

The stealership is the best bet.

[jlitman]

I didnt double o ring it, just used stock ones no problems yet and its been a couple months.

also they shouldnt cost anywhere near 500 bucks!
http://www.nengun.com/sard/injectors they were AUD$400 delivered

if u sign up with nengun.com it will automatically display how much your shipping will be for each part, the site will also highlight parts made for ur car in pink so u dont have to scroll through the full list of part numbers.

Good site, real cheap but did about 4weeks for my PFC and injectors

According to my emanage datalog, I hit over 94% duty cycle just past 8.2K :faint: (I might have some wiggle room to scale that back safely, tho')

However, at 7.8K (normally don't rev higher than that) I'm ~ 81% duty cycle -- still, a bit high.

I think I'm ordering these bad boys sooner than originally intended... :(

[Jesse IL]

any place online to get orings or should you just go to the dealer and get the orings?

The stealership is the best bet.

I've bouught them at Car Quest before as well. They had a giant box of various size o-rings.

[youngxlos]

^^^ i wen to advance autopart and they had a pack of them, then i went to homedepot and they had the right size but they were fatter. so i still had to go to my dealer to get them.

[jlitman]

How much pressure do the Walbro 255lph pumps produce? It might be cheaper to upgrade the pump rather than the injectors.

According to this formula:

New inj flow rate = SQRT[(new pump pressure / old pump pressure)] * old inj flow rate

Therefore, if:

new pump pressure = 80
old pump pressure = 55
old inj flow rate = 43 lbs/hr (440 cc)

then :

x= SQRT[(80/55)] * 43 = 50.86 lbs/hr = ~519 cc's pretty close to the 530's :shrugs:

EDIT: Oh wait -- is it maybe not quite that simple? Does a new fuel pump just mean more stable fuel pressure, but to actually raise the pressure over stock you need a different pressure regulator or something? :confused: