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Old 03-21-2009, 07:07 PM   #1
j3t
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Default ej20g injector question

Getting my car tuned soon, and wanting to get some new injectors. What is a good direct upgrade for this? Is there a stock fuel rail that is an upgrade for the ej20g? Ive got greytops in now, which from what i hear are stock.

Thanks,
Jet
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Old 03-21-2009, 11:23 PM   #2
rockcrete
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I wouldn't worry too much about the fuel rails. If you want to upgrade injectors, I believe 300ZX ones are the same so there are plenty of aftermarket options around.
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Old 03-22-2009, 02:31 AM   #3
suberdave
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dont mess with finding a set of injectors that may fit...

buy a set of phase 2 adapter collars, and then any USDM STI sidefeed injector will fit right in to your rails...

i have these ones and they are awesome...

http://www.fecker.co.uk/scooby/product.php?id=2


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Old 03-24-2009, 04:03 AM   #4
ncarn8
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or, STI yellowtops are 440cc. cheap bolt in upgrade.
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Old 03-24-2009, 06:51 AM   #5
RealDealTarheel
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Quote:
Originally Posted by ncarn8 View Post
or, STI yellowtops are 440cc. cheap bolt in upgrade.
Which the stock gray tops are also 440cc........
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Old 03-24-2009, 03:37 PM   #6
Rei_Akira
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while we're talkin about injectors, i have a spare set of Tomei 555cc's out of a SR20, are those a drop in replacement (EG20K).
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Old 03-24-2009, 06:26 PM   #7
sniper512
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Okay i have thought for quite sometime that the gray tops are 440s as well but the more I talk to people about them the more I get confused. I know my car come stock with the TD05 and have been told that with the TD05 comes 440s, but lots of people argue with me about it. Does anyone have proof/data that the phase 1 WRX's come with 440s? Rob? I just keep hearing different opinions.
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Old 03-24-2009, 06:56 PM   #8
rockcrete
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If my memory is right, the WRX injectors are the JECS side feed and the part #'s are on them - I think they might be 0R05

http://www.witchhunter.com/injectordata1.php4

Just remember that flow rate is subjective to fuel pressure and if you're planning on leaning on your motor, send them out and get them flowed if you're not upgrading.

Last edited by rockcrete; 03-24-2009 at 07:04 PM.
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Old 03-24-2009, 06:57 PM   #9
Rikshaman
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should be the same as supra injectors? 2jz. lol
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Old 03-24-2009, 07:21 PM   #10
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actually, yes. 2jz injectors will work as long as you use a resistor pack.
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Old 03-24-2009, 07:38 PM   #11
blkgm8
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Quote:
Originally Posted by RealDealTarheel View Post
Which the stock gray tops are also 440cc........
Depends on what bar fuel pressure... The grays are rated flow 370 whereas the yellows flow 440cc at same bar pressure.

Yellows are bigger injectors flow wise than grays.
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Old 03-24-2009, 10:59 PM   #12
suberdave
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Quote:
Originally Posted by rockcrete View Post
I think they might be 0R05
Just looked they are. anyone have numbers on the yellow tops???

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Old 03-25-2009, 02:32 AM   #13
kleinkid
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Default yellow tops

These yellow tops I have came out of a ej20k intake manifold and they are
OR15.
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Old 03-25-2009, 05:25 AM   #14
RealDealTarheel
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Quote:
Originally Posted by blkgm8 View Post
Depends on what bar fuel pressure... The grays are rated flow 370 whereas the yellows flow 440cc at same bar pressure.

Yellows are bigger injectors flow wise than grays.
What bar pressure are the gray's rated at 370? Everything I've ever read says they're 440's. I haven't sent my spare set to be flow tested because well, honestly I don't really care, but I'd like to see your data.
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Old 03-25-2009, 08:51 AM   #15
Jaxx
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agggg misinformation

greys 440 cc at 3 bar
yellow 480 cc at 3 bar
all the other test you see are at 3 bar example: blue usdm wrx top feed 440cc at 3 bar

this is from results at RC engineering

those bad numbers (370,390,440) are a 2.5 bar (which is used in au/nz) but have no idea why

sr20 injectors will not drop in they are phase 2 and need the rail adapter
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Old 03-25-2009, 09:57 AM   #16
sniper512
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Awesome definitive. Me likes.
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Old 03-25-2009, 11:29 AM   #17
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thanks Jaxx, much appreciated.
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Old 03-26-2009, 02:33 PM   #18
thad
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Ok, I may be way off on this one, but since the EJ20G FPR is set somewhere around 2 bar, doesn't that mean that the Gray tops will not even break the 370cc mark in use on a stock motor.
I may be assuming something incorrectly.
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Old 03-26-2009, 03:09 PM   #19
rob
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You are. Stock fuel pressure is 3 bar.
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