5PSI 10Degrees Stock GReddy + Jim Pipes - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-04-2006, 01:25 PM   #1
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Default 5PSI 10Degrees Stock GReddy + Jim Pipes

5PSI, A/F was at 14:1 so aborted the run
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Old 10-04-2006, 01:39 PM   #2
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what's with the dip? did your boost spike? got a log of the AFR? what are you using for fuel now? Stock pump?
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Old 10-04-2006, 01:40 PM   #3
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Looks like how mine dropped off due to fuel issues.
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Old 10-04-2006, 02:44 PM   #4
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mine did that before i had an o2 clamp
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Old 10-04-2006, 10:54 PM   #5
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braineack, this was the dyno sheet from the discussion I was having with you on Saturday. Here's the A/F It's stock fuel stock vortech. can i run an o2 clamp w/o emanage?
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Old 10-05-2006, 09:52 AM   #6
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Huh you're really fuel starved. Your stock pump really should do better. Do you have a fuel pressure gauge?

I see a walbro in your future.
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Old 10-05-2006, 09:53 AM   #7
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Have you replaced your fuel filter?
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Old 10-05-2006, 11:41 AM   #8
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You need to verify the condition of your pump. Looks like it can barely supply fuel. It could be working, the filter could be a restriction, or your plumbing could be wrong.

First off, verify your FMU is plumbed correctly. The fuel line from the OEM FPR should be connected to the offset fitting on the FMU. The center fitting shoulb be connected back into the return hardline. The line from the FEED line to the front of the fuel rail should not have been touched.

If this is correct then replace you fuel filter and buy a fuel pressure gauge and test your pump.

You'll need:
1 - Fuel Pressure Gauge (on the cheap at any local hydraulics store, try to get one that can read to at least 125psi)
1 - 5/16" brass tee
1 - 1/8" NPT to 5/16" fitting (for the gauge, shop shoudl be able to help)
5' - 5/16" fuel injection hose
5 - Screw clamps
To install:
Cut about 1' off the hose. Clamp that section to the brass tee. Clamp the 4' section to the tee as well. clamp the gauge on that 4' section.

Remove your fuel inlet hose from the hardline (otherside connects to the front of the fuel rail) and connect that to the tee. Then connect the 1' section of hose to the hard line.
To Test The Pump:
Start the car. Idle should be 35-36psi. Remove the vacuum line from the OEM FPR on the fuel rail. (Kink the vacuum hose so the car doesn't die). Idle should be 48-50psi.

Stop the car. Jump GND & F/P in the diagnostics box. Turn the car to ON, but don't start it. This will run the fuel pump. wrap cloth around the return line and use a vice grips or something similar and clamp down on the hose. This will increase the fuel in the rail. Verify 75-85psi.
If your pump cannot supply this amount then it may be in need of replacement.

To Test The FMU:
Ignition to ON. Keep the GND & F/P jumped. Run 5psi of air from an air compressor into your FMU vacuum line. Verify the fuel pressure increases to the max pump output.
hope this helps. can you send those .drf files this way?
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Old 10-06-2006, 12:49 AM   #9
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^

You sir are truely helpful!
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Old 10-06-2006, 02:33 AM   #10
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braineack is def. the man.
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Old 10-06-2006, 09:36 AM   #11
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forgive my n00b question and the slight threadjack, but what's the ideal A/F? 13:1, 12:1?
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Old 10-06-2006, 10:05 AM   #12
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right inbetween the two is the most potential for power/safety
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Old 10-07-2006, 11:36 AM   #13
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thanks!
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Old 10-07-2006, 11:39 AM   #14
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Quote:
Originally Posted by Mach929 View Post
mine did that before i had an o2 clamp
what exactally does the o2 clamp do?
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Old 10-07-2006, 01:53 PM   #15
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The clamp prevents "lean tip-in" by substituting the o2 sensor voltage output with another voltage, not allowing the ecu to cut fuel.
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Old 10-07-2006, 06:30 PM   #16
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I've been searching on this site, the O2 clamp seems like a DIY project, are there any links?
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Old 10-07-2006, 10:35 PM   #17
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get 50 posts and you could win one from older guyif you are the 50,000 post or just buy one from olderguy.
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Old 10-08-2006, 12:34 AM   #18
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Braineack,

I'm thinking of doing the dual feed fuel rail and installing 1.8s while I'm at it. over on .net you said to use 21/64" Drill bit

1/8" NPT tap
1/8" to 5/6" brass ftting
5/6" Brass Tee
2 - 1' sections of 5/6" fuel injection line
JB Weld
Grease
5/6" Hose Clamps

is it 5/16 or 5/6?

http://forum.miata.net/vb/showthread...ight=feed+rail
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Old 10-08-2006, 02:33 AM   #19
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5/16

5/6 would be HUGE
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Old 10-08-2006, 05:02 PM   #20
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yeah typos. 5/16"
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Old 10-09-2006, 09:54 AM
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