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Old 05-01-2007, 06:59 PM   #1
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Default Vortech with Greddy Kit

Anyone knows what kind of disk comes with the Vortech FMU that is included in the greddy kit? I guess I never thought about it before.
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Old 05-01-2007, 07:00 PM   #2
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12:1 in a new kit
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Old 05-01-2007, 08:18 PM   #3
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if you're staying running a fuel pressure system, first purchase after the WB needs to be a disk kit or a BEGi FMU. 12:1 is nuts
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Old 05-02-2007, 01:21 PM   #4
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Ben,

why do you think 12:1 is nuts?
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Old 05-02-2007, 01:30 PM   #5
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do the math...stock pump can only output 70-80psi. new pump should be bale to output closer to 120psi.

5 x 12 + 50 = 110psi. at 5psi you're already at 110psi of fuel with a 12:1 disc.
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Old 05-02-2007, 01:32 PM   #6
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The only time you can stay with the 12:1 is with the OEM pump(which tops out at 80psi)
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Old 05-02-2007, 01:39 PM   #7
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so I've got my 190lph hp pump coming from lighting motorsports. are you saying I'll have to first get a disc kit and put a 10:1 or less in there?
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Old 05-02-2007, 02:34 PM   #8
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Yes. Less than a 10:1

You want to calculate based on the injectors you will be using.
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Old 05-02-2007, 03:38 PM   #9
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1.8 265 injectors. which disc would be recomended?
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Old 05-02-2007, 04:10 PM   #10
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Quote:
Originally Posted by olderguy View Post
The only time you can stay with the 12:1 is with the OEM pump(which tops out at 80psi)
Does it have a valve that does this? Or is it just physics, wherein the pump volume drops so dramatically as pressure goes up that pressure levels off in the system? Or in other words, having an insufficient pump is the only thing keeping your injectors from locking open.

Here's some info on this subject (but for another car)
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Old 05-02-2007, 06:48 PM   #11
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Physics. Very similiar to the plot of the DSM OEM pump you referenced.
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Old 05-02-2007, 06:49 PM   #12
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Quote:
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1.8 265 injectors. which disc would be recomended?
Probably a 6:1 or 7:1, depending on the condition of your pump.
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Old 05-02-2007, 07:18 PM   #13
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I run a 6:1 with 270cc nissan rb2o injectors and a 190hp pump. 2 1/2 inch downpipe transitionig to 3 inch with no cat, and a 2 1/2 inch hard intake crossover.

6ish psi (snugged wastegate, no boost gauge yet), NO INTERCOOLER. Timing at 6 degrees with ngk zfr7f-11 plugs gapped at .035

Car runs vey well with absolutely no detonation.
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Old 05-02-2007, 08:32 PM   #14
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Well, if you go with the 12:1, you could get the GSS250 190lph which supplies plenty of flow and pressure up to 100psi and tops out. I find the 12:1 works better for supplying fuel quicker during acceleration, but this is just from the butt dyno. I would have to log a/f ratios for each disk from 6:1 to 12:1 to see if they make a difference.
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Old 05-02-2007, 08:57 PM   #15
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you guys and your guessing....use the math in my FAQ



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