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Old 11-20-2006, 01:52 PM   #1
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Default who is running 440+ injectors on an NB?

I know there are limited NBs here but since that's what I'm building, that's why I'm asking.

I know Markp is running 880s. Y8, what are you running?

The whole returnless fuel line on the 99+ is why I'm asking. I guess I still can't grasp why people over at M.net are talking about adding the return line from the NAs to run bigger injectors. Seems that any decent EM would allow bigger injectors at stock fuel pressure just fine.

I emailed Gary at Trackdog regarding the EMUs they're running on their high HP cars and he said the same thing.

Frank
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Old 11-20-2006, 02:36 PM   #2
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I dont either. With good EMU I think that you should be able to run the injectors you want, and in lieu of higherpressure just run larger injectors to get enough fuel in there.
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Old 11-20-2006, 02:53 PM   #3
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Well you're right BUT the problem is the deadhead fuel rail has a hard time holding 60 psi under load. From others' data it drops down to 50 or below. Adding a return, and a way to clamp down on it, is a very easy and effective fix. Also you can add in a rrfpr to add in 1 psi of fuel pressure per 1 psi mani pressure to offset differential pressure. Otherwise, 50 psi rail pressure - 10 psi boost pressure = only 40 psi actual =
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Old 11-20-2006, 04:01 PM   #4
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I run 550s but I haven't turned up the wick on the setup enough to find their limits.
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Old 11-20-2006, 09:07 PM   #5
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I just bought some RX-7 550's that will be sent off for cleaning and flowing this week.
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Old 11-21-2006, 08:10 AM   #6
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Quote:
Originally Posted by cccpull View Post
I'm running rc650's at 80 psi on a '99.
On the stock returnless rail?
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Old 11-21-2006, 01:14 PM   #7
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rx7 460's with the hydra
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Old 11-21-2006, 05:11 PM   #8
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From what I understand, Gary has been round 'n round with the EMU. I don't know what he did on SDS.


BTW, his red car owns my life.
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Old 11-23-2006, 12:14 AM   #9
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460s on a 2000. SDS controlled. never see under 58 psi at the rail.

in the head? maybe it does drop but, it isnt a problem yet.
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