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Old 02-14-2005, 04:23 PM   #1
andys
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Default injector flow rates

Does anyone know the injector flow rates for EJ18 injectors? I have reason to believe that the 2.5 RS injectors are 280cc/min and the 2.2 are 220cc/min but I don't know what the 1.8 are.

The reason I am asking is becasue I am running my EJ25 with 280cc/min injectors on the 1.8 ECU and the fuel consumption is crap. The engine makes the right power but the driveability is not what it could be with flat spots etc. in fact it's getting to be really annoying.

I'm hoping that I can install the EJ18 injectors into my EJ25 and my fuel mix will be a little better. Does anyone have an ideas or experience with this?

-Andy
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Old 02-14-2005, 05:19 PM   #2
Matt Monson
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The EJ18 injectors are the same as the EJ22. And you will likely run lean and maybe even detonate if you switch them out. Mods cost money, and the first place that power hits you is in fuel. Live with it...
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Old 02-14-2005, 05:54 PM   #3
andys
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Default flow rates

Why do you think it'll run lean? The AFM is by far the dominant driver of the injector pulse width so in theory I'd want to run the injector that was mapped with the ECU regardless of the engine size. Additionally I still have the O2 sensor closed loop making small compensation adjustments.

Why lean? Am I missing something?
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Old 02-14-2005, 05:58 PM   #4
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Default livin with it

And I'm not willing to accept a motor running out of tune. It's like listening to a piano that isn't tuned. Gross. It's not about power - it's about engineering something that's higher performance and that certainly includes proper tuning.
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Old 02-14-2005, 06:28 PM   #5
Matt Monson
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Ok,
Let me think this over again. Where's my head today. We are runing Ej22 injectors on Diz's car with the EJ25 block. It will detonate on hot days at high rpms under load, but in general it works.

So, here's the question. What year RS engine? If it is a '98, you can drop in those little mini rails from a 1.8 right in. If it is a '99 or newer, I believe you could use EJ22 injectors from a phase II, but I would do some research before taking my word for it...
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Old 02-14-2005, 06:34 PM   #6
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Quote:
Originally Posted by andys
The AFM is by far the dominant driver of the injector pulse width
no its not .. it ONLY makes adjustments to the fixed table in closed loop and at that it will only make a finite amount of adjustment
so when you reach say 60% thorttle it goes to base map (no correction)
and whenever the water temp is below 65C (i think) it reverts to base map

get the right ecu
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Old 02-14-2005, 06:57 PM   #7
andys
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Right, the O2 sensor makes fine adjustments to the fixed table but the AFM inputs tell where to look in the fixed table - which is by far a larger effect.... I think.
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Old 02-14-2005, 08:55 PM   #8
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90-94 EJ22 injectors are rated at 270cc/min. I would assume the 95+ EJ22's are the same. They'll flow around 280cc/min.

Here's the calibration sheet on the ones I have in my legacy now
http://www.main.experiencetherave.co...jectorcalb.jpg
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Old 02-14-2005, 09:38 PM   #9
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Its more then just injectors causing your drivability problems. The ej18 ECU is mapped for 115hp not 165....50 hp is nothing to sneeze at. Another vote on getting the correct ECU
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Old 02-15-2005, 01:59 AM   #10
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I'm using 1.8 injectors on my EJ25, but I'm also running higher static pressure 38-40psi. I'm also using an SAFC to help things out. I don't have any A/F info (right now) except by pulling plugs and looking at them. My motor isn't exactly stock though....so YMMV. I can really only add thet they do infact work. I dunno if you'll get better milage or drivability.


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Old 02-15-2005, 01:34 PM   #11
andys
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Quote:
Originally Posted by Scoobie Steve
Its more then just injectors causing your drivability problems. The ej18 ECU is mapped for 115hp not 165....50 hp is nothing to sneeze at. Another vote on getting the correct ECU
Then why am I getting too much fuel? With your logic it seams I sould be running terribly lean.

my logic is that if I use the smaller injectors that match the ECU mapping then, based mostly on mass air flow, I'll have a more appropriate air fuel mixture. That being said, I really have no idea how the 1.8 mapping really works..... Gotta get a Link.
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Old 02-15-2005, 03:51 PM   #12
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what is telling you that you are running lean?
you may be running rich at certain loads, like cruising, but lean at wide open throttle or something.
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Old 02-15-2005, 05:19 PM   #13
andys
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Quote:
Originally Posted by sick1.8t
what is telling you that you are running lean?
you may be running rich at certain loads, like cruising, but lean at wide open throttle or something.
Seriously. This is true. I'm just assuming rich becasue 1) my injectors are larger and 2) I burn a crap load of fuel. I mean like a lot. I can only get about 200 miles on a full 60L tank.

Other than that the car pulls fine. It makes all the power. It just doesn't run that nicely.
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