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Old 03-17-2011, 11:40 PM   #1
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Default Most boost on stock injectors?

What is the highest boost you guys have run on your stock injectors? List turbo size and fuel management when replying please.
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Old 03-18-2011, 12:04 AM   #2
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I ran a 2560 at 8psi on stock injectors. Maxing out at 155% DC, woo-hoo.

EDIT: I'm sorry, I spiked at 11psi once and hit 225% DC. With the log to prove it.
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Old 03-18-2011, 12:47 AM   #3
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A friend of mine had a 92 miata, Greddy kit with the fuel riser, FMIC intercooler, and a greddy e-manage. He got up to 9psi. Can't remember the HP but I think he hit 178ish.
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Old 03-18-2011, 12:49 AM   #4
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Quote:
Originally Posted by rider384 View Post
I ran a 2560 at 8psi on stock injectors. Maxing out at 155% DC, woo-hoo.

EDIT: I'm sorry, I spiked at 11psi once and hit 225% DC. With the log to prove it.
I assume you were able to maintain proper AFR at 8 psi on your 2560, but at 11 psi I'm thinking you went a tad lean!
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Old 03-18-2011, 12:56 AM   #5
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Actually, at 225 it was at a dead even 10.5
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Old 03-18-2011, 01:02 AM   #6
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Quote:
Originally Posted by rider384 View Post
Actually, at 225 it was at a dead even 10.5
Un-F'n-believeable! That's pretty awesome!
My reasoning for this thread was simply because when I run my car on stock injectors, it runs pretty smooth. When I run the 460's it runs smooth most of the time, then sometimes not. I even tried a brand new set of 460's. I just feel they're unnecessary for what my car needs are. I drive it as a daily driver in nice weather, and I really don't need to see over 10 psi, so why use 460's if I really can get away with stock injectors? It ain't like I'm running a voo-doo box, I use MS2 Standalone.
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Old 03-18-2011, 01:04 AM   #7
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On factory fuel pressure and pump, I ran 8 psi, I think I was at 130% DC.
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Old 03-18-2011, 01:05 AM   #8
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Raise the pressure with stock injectors and you should be good to go, depending on power levels.
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Old 03-18-2011, 01:15 AM   #9
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I'm guessing that on my setup 10psi would be right around 200whp.
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Old 03-18-2011, 01:46 AM   #10
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15g, vortec rrfpr, 190HP fuel pump, megasquirt, 12psi.

I didn't run it like this for long before getting 550's.
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Old 03-18-2011, 10:32 AM   #11
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There's always rx8 yellow injectors, oughta atomize even better than stock injectors.
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Old 03-18-2011, 10:50 AM   #12
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They are either locked open or not. anything above 90% or so is completely open.

I maxed my 305cc injectors at 7psi, which was around 170rwhp.
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Old 03-18-2011, 06:43 PM   #13
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12lbs. 1.6 on tan tops. vortech sfmu and walboro 255hp stupid fuel pressure my guage stopped at 130psi. it would hold 11/1 af though. not that I'd recommend doing so.
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Old 03-18-2011, 07:21 PM   #14
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460s and 550s don't idle well. Shitty injectors but ok for cheapo projects.
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Old 03-18-2011, 07:26 PM   #15
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Sr20DET T25, Walbro 190lphHP, Bipes, O2Clamp, stock 1.6litre motor, 110psi fuel pressure, reman'd tan-tops... 14psi and just fine until I got 305's. Right around 200whp.
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Old 03-18-2011, 07:39 PM   #16
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Quote:
Originally Posted by Reverant View Post
460s and 550s don't idle well. Shitty injectors but ok for cheapo projects.
Is that a blanket condemnation of all injectors rated at 460 or 550cc, or did you have a bad experience with one particular brand or style of them?

I ask only because I didn't find the 465cc injectors which I got from Five-O to be particularly shitty, and the car idled well enough with them on to pass a CA smog inspection.
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Old 03-18-2011, 07:52 PM   #17
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I gave him the benefit of doubt and assumed he was talking about these injectors on a stock computer with an "adjusted" AFM.
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Old 03-18-2011, 07:55 PM   #18
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I'd also like to know as I bought some low impedance EVO 550s hearing they were much better. I got the individual injector driver board for my MS2 for them, too.
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Old 03-18-2011, 08:51 PM   #19
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I maxed out my red tops with stock fuel pressure and about 7-8 psi seeing low 12 afrs.
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Old 03-18-2011, 09:48 PM   #20
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I'm running cleaned and flowed 1.6 injectors with diypnp at 7psi (8.5 spike). IIRC, when they were cleaned they were flowing 230cc, even though they are rated at 212cc
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