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Old 04-02-2004, 02:52 PM   #1
scoobyimprza
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Default RS fuel injectors

Alright, I'm pretty possitive that I can put RS fuel injectors onto my 93, but I just wanna double check. Also, what flow rate do they have? Can anyone give me a good price for a set with the wiring? Thanks!

Brent
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Old 04-02-2004, 06:17 PM   #2
Mancini
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RS stockers are 280cc
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Old 04-02-2004, 09:16 PM   #3
Unsung Boxer
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is that enough flow for your turbo project? i never understood injector sizing.

I mean why do some people get huge 600cc injectors and throw them on their WRX's only to turn up the boost like 3 psi? I mean, can't the stockers handle some small increase?

And in this situation, how can 280cc be enough? If it where, then why are RS guys upgrading thiers for light-pressure kits

-Jake
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Old 04-02-2004, 10:05 PM   #4
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Well, injector sizing has a lot of factors. It depends on the amount of air you're pushing (engine size, boost pressure, rpm), efficiency of the motor and of the turbo, fuel pressure, fuel pump flow, tuning...

I ran 4.3psi on a 2.5L motor with a turbo that was barely in it's efficiency zone at that low of boost and had no signs of det with stock injectors at stock fuel pressure. I calculated I was seeing around ~300cfm at redline. So I guess if you're not seeing much more than that or if you're bumping the rail pressure up it should be fine. And I'm sure Brent knows what he's doing

As for why people throw huge injectors on, well lower IDC's can actually improve power...and if you can tune out the problems with large injectors then why not. Or maybe they are planning on big power eventually! But in theory a properly tuned setup shouldn't need giganto 950cc injectors, alot is overkill, lack of choices, or simply not wanting to run on the raged edge.

That's my 2c,

Brian
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Old 04-02-2004, 10:14 PM   #5
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I have the Silvia 370cc injectors right now and was thinking of doing the injector mod on my EJ18 180cc injectors, but I don't think it's be worth it. At idle and cruising, my car is extremely rich, especially at idle. At WOT, running around 5-5 psi, I have the SAFC sending no less than a -35% air flow signal to the ECU. So I figured with 280cc injectors, I can keep them around normal flow. I'm also using a WRX fuel pump and my 1.8 FPR. My car is only sitting around 170hp, if that.

Brent
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Old 04-02-2004, 11:52 PM   #6
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Default My experiance

I can tell you that when I had my 2.2NA engine running a legacy turbo at 7psi with RS injectors they had good A/F but I was at 50% at higher RPMS. I don't know if this helps much.
Joshua
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Old 04-03-2004, 01:06 AM   #7
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50% below or higher?
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Old 04-03-2004, 09:43 AM   #8
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It was a positive 50%.
Joshua
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Old 04-03-2004, 09:49 AM   #9
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Hmm, well maybe since I'll be using them on the EJ18, they'll be okay. There is only one way to find out, so it looks like I'll be trying it out.

Send me your injectors!

edit for the fragment sentence :doh:
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Old 04-06-2004, 11:30 PM   #10
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I looked at some injectors tonight, and they are top fed. So my quesiton is, are the phase 1 injectors side fed? What other cars have a phase 1 EJ25? Forester? Legacy GT?

Brent
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Old 04-07-2004, 01:19 PM   #11
yebokmj
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Default injector years

The injectors from the MY98 RS, MY98 Forester. MY96-99 outback and MY97 Lsi/Gt MY98&99 GT
Joshua
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Old 04-07-2004, 01:31 PM   #12
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Thanks!
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Old 04-07-2004, 01:42 PM   #13
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Did someone have try to install 8 injectors setup??? By installing 4 injectors on ther intack manifold and controling then with a SDS controler or something like that???
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Old 04-07-2004, 03:48 PM   #14
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Yups been done many times... A person that used to post here frequently had a crazy setup "Happy" was his name...



But injector size have always been related to compensation of other "things"


ok ok j/k
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