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Old 12-19-2008, 06:57 PM   #41
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just out of curiosity...what would be the impact on an turbod engine thats running lean for like 6 months ? If any ?
I had my old vw tuned with an uncalibrated wbo2 sensor...it ran at 13.5:1 for about a year. The pistons looked fine, but were clean as could be, most likely from burning off anything in the chamber, lol. I always wondered why the turbo housing and manifold would glow yellow (like a post-it-note) when all my buddies would glow dark, beat red.

I never ran the motor hard for extended periods of time like I will in the miata. 30 minutes at 13.0:1 is a lot different than 11.8 seconds.
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Old 12-19-2008, 07:05 PM   #42
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just out of curiosity...what would be the impact on a turbo'd engine that was running lean for 6 months? If any?
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Old 12-19-2008, 07:07 PM   #43
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13.5:1 isn't terrible. Don't the narrow band gauges go lean at 14.7:1? So he's above that...
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Old 12-19-2008, 07:15 PM   #44
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13.5:1 isn't terrible. Don't the narrow band gauges go lean at 14.7:1? So he's above that...
yes and yes. You're right...time to leak it.

Wow running any motor under load at 15:0+ is scary to think about.


Couldn't he also be running so rich that its reading lean? If fuel gets on the sensor it shows lean. I bet this is the case if he's been driving it for a year. I forgot to change the enrichments on my car with the 550's (from the stockers) and it pegged lean when triggered.
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Old 12-19-2008, 08:50 PM   #45
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Couldn't he also be running so rich that its reading lean? If fuel gets on the sensor it shows lean. I bet this is the case if he's been driving it for a year. I forgot to change the enrichments on my car with the 550's (from the stockers) and it pegged lean when triggered.
This could also be the case.
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Old 12-20-2008, 01:14 PM   #46
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Okay, I guess I'm feeling nice today, or maybe b/c x-mas is around the corner....

#1 Your wastegate may be loose, but is not the problem since you are seeing 5psi on your boost gauge.
#2 Are you sure your clutch is not slipping?
#3 You can have normal base pressure of 40psi with the AFPR hooked up wrong
#4 Yes, running lean in boost can damage your engine, but your compression numbers look decent so don't hammer it until you get this sorted.

That being said. Find your fuel rail (attached to all four injectors and intake manifold), on the back end of your fuel rail is the stock FPR (basically only thing attached to the fuel rail) with a fuel line coming off it. This should go to the IN port of the AFPR. Then the OUT port of the AFPR should go to the hardline by the charcoal canister.

If the AFPR is attached to the other fuel line attached to the fuel rail then obviously a problem. If the IN/OUT lines are swapped then again a problem. Finally, there should be a vaccuum line attached to the vaccuum port of the AFPR so it raises fuel pressure only in boost. If this line is missing or disconnected then again a problem as the AFPR will not raise your fuel pressure when in boost.

just got back working on the car...your tip on the AFPR was EXACTLY the problem. In was completely WRONG from the instructions Stephanie sent ( thanks btw ). There was residual residue orange like fluid that was under the Begi FMU ( the ufo ) , i wiped it down and removed all the hoses to the FMU ( hard to pull out btw ) After reinserting the hoses in line with the instructions to the FMU.I took it out for a spin and now it no longer rides lean It shows rich when i floor it and it just " feels " better. Ride is more consistant in acceleration and it doesnt bog down anymore. I still need to tune it, but my Fuel pressure gauge hose is too short to bring it out to my front window to see when i drive Im gonna have to get a longer one now....but that the least of my problems

It just seems like the SOB of a mechanic just hooked it up by guessing where the hoses go w/out tellng me he didnt know how to connect them I even gave him the instructions that came with the turbo to help him..I should torch his shop...

Anyway, it seems that the FMU is working...its providing more fuel when I boost and the car definitly moves now. Its like i got it installed the first time....i cant believe it took me almost a year to do it...

thanks guys...
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Old 12-20-2008, 01:34 PM   #47
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Now that im lookin at the pics before i disassemble it...it looks like he put the hose from the stock regulator and hooked it up to the OUT of the FMU...i can only imagine what that could of caused..and thats only have of the way he set it up...
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Old 12-20-2008, 02:25 PM   #48
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Now turn it to 6psi.
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Old 12-20-2008, 02:55 PM   #49
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I'd wait for a wideband before you tune to 6psi. most of us run anywhere from 11-12.5 (correct me if I'm wrong guys) for air fuel ratios, which means your narrow band is always going to show lean, which is why a lot of us have widebands.
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