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wbo2 installed... scary afr's
Ok so I've been running this setup around 5-6psi for a while.. and my motor still seems to be very healthy(doesnt smoke).. so i figured my afrs would be alright..
I wish.. idling they hang out around 14.5ish and will occasionally lean and rich out a little if it idles for long enough. On the road When i get on it they are around 14 at say 1k rpm, they richen out to a nice 11.5 or so, then lean out to 12... and right at 4k rpm they hit 14's again and hold to redline. =(. So I'm going to guess... dying fuel pump? Most likely I'm thinking, as it is the original one i believe(170k miles). I will test it tomarrow if i can source a gauge. What do you guys think? Setup in sig. |
it could be the FP, you'd need to put a fuel pressure gauge on the feed line to see what's going on in boost.
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Originally Posted by Braineack
(Post 259953)
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? Ive never noticed any knock ever, and Ive kept my eyes(and ears) open for it since i installed the kit. Do you guys think i did any damage? I do smell gas in the oil.. but I'm pretty sure that was because my o2 was out for a while(i just replaced it today, and it runs and idles MUCH MUCH better, and no longer smells like a carburated car while idling.). But the motor does not smoke at all... Also the wbo2 is installed about 2 inches away from the outlet of the exhaust(open downpipe) Ive heard of air going back in and leaning out the sensor, but im guessing this wouldnt be the case at 4k+rpms. |
and 11.5 is too fat according to the power players on here. There is no real reason to go fatter than 12.1 or so sub 350whp.
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Yeah, from what ive read im shooting for between 12-13 afrs.
I want to get this piggyback setup running decent for the time being, as i need to buy other stuff before megasquirt(which is definitely in my future). |
My vote is weak fuel pump.
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:ohnoes:um i see nothing adding extra fuel in for boost in your setup
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Originally Posted by hustler
(Post 259995)
and 11.5 is too fat according to the power players on here. There is no real reason to go fatter than 12.1 or so sub 350whp.
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Originally Posted by Mach929
(Post 260049)
:ohnoes:um i see nothing adding extra fuel in for boost in your setup
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For the record, I was having some fuel issues that went away the same day I replaced my stock fuel pump with a Walbro. Always worth it to replace things like that when they are getting close to 20 years old! And don't forget the filter too!
Vash- |
Originally Posted by hustler
(Post 259995)
and 11.5 is too fat according to the power players on here. There is no real reason to go fatter than 12.1 or so sub 350whp.
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Originally Posted by Fireindc
(Post 260077)
Yea, sorry im running the vortec fmu w/ stock Greddy kit disk (12:1)?
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If it's the typical GReddy, he's running lean right about where the GReddy spools to max boost. The 12:1 and FP are dumping plenty of fuel as boost rises. An 8:1 disc might actually help alleviate the rich condition spooling up, but it seems like the FP will still crap out if it can't provide enough pressure at max boost?
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I would agree that it's not the FPR. I'm currently at 7 psi and nowhere near 14:1. Granted, I'm using MS to control things, but it's running stock 1.6 injectors backed by the vortech fpr with the 12:1 disc, so if I can pull better A/Fs with another pound of boost that you you should be able to too unless your pump is shot.
-Ryan |
I've got an FP out of my NB if you want it. 30K miles on it. You'd need to cut the ends off your connector but the NB pump just uses ring terminals.
Obviously a Walbro is an option, but if you want to save some bucks... Frank |
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