<TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" width="100%" UNSELECTABLE="on"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">I bought a turbochargeg 325is from Connecticut. I live in Reno which is 5000ft of elevation and my air fuel ratio is between 15.7 - 15.9, Is this normal? What is the perfect reading? The previous owner told me that the car was tuned by David of active autowerke. What can I do to get this fix.
Thank you so much. God bless.
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Under what conditions do you see the AFR of 15.7-15.9? What are you using to check your AFR's?

The more specific information you can post, especially about the type of setup you have, the better.

Boris

<TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" width="100%" UNSELECTABLE="on"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">When idle and running. It use to have a straight pipe and it was like 11.8 when boosting and 15.7-.9 at idle then I put a cat converter for smog now it runs 15.7-.9 even when boosting. It has an AEM AFR gauge. And for the setup I only know it has a precision sc 61 turbo. Thanks.
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wow. Not horrible to see jumps to 15.7 at idle, but while boosting? Way too lean, I wouldn't boost again until I got it figured out.

Might want to recalibrate your wideband. It might have been calibrated for a different elevation/oxygen content.

<TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" width="100%" UNSELECTABLE="on"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">When idle and running. It use to have a straight pipe and it was like 11.8 when boosting and 15.7-.9 at idle then I put a cat converter for smog now it runs 15.7-.9 even when boosting. It has an AEM AFR gauge. And for the setup I only know it has a precision sc 61 turbo. Thanks.
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Putting a CAT in the car without changing anything willl not affect your engines ait/fuel ratio. All the cat does is burns off he extra HC's and CO's with trying to reduce NOX.

Thats nothing to do with your engines Air fuel ratio

<TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" UNSELECTABLE="on" width="100%"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">What do you think happened, after I put the cat the AFR reads 15.7-.9 even on boost, He changed the position of the 2 sensors in the exhaust do you think that caused it to be lean. Thanks.
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My old car....


It was tuned by GEORGE from ICS and KARL from active... (david? hmm :help )


MODS:


Vac .140 Head gasket
ARP stud kit
--------> Head was also resurfaced and checked for cracks before the new gasket went on.
Precision SC61 TURBO - 4" inlet 2.5" oulet
Tial 38 mm wastegate
Audspeed (spa) Manifold
AA Stage II Intercooler
Hks Blow Off Valve
3.5" HFM
Custom AA/ICS Tuning
Custom ICS lower 4" intake piping
Custom Disccharge and Intercooler piping
Custom 3" ICS Exhaust w/ Borla Mufler
Aem Wideband split second O2 Sensor
BoostLogic Motor mount
Auto-meter Gauges (water temp; oil press; oil temp; boost)
Greddy Profec-B Boost Controller
Greddy Turbo Timer
42 lbs. Green Top Injectors
Upgraded Walbro Fuel Pump
Centerforce Performance Clutch
Resurfaced M3 flywheel.


Should be all for the motor.

DYNO of when it left CT:

http://pic2.picturetrail.com/VOL1014/3599993/10553634/152235980.jpg


Im not saying elevation couldnt be playing a factor but I have a feeling something happend when installing the cat (wideband sensor or other possibiliteis)... jlag has also complained to me about a fluxuating idle (now i dont know if he is running the car w/ this problem and getting these "high" readings because if he is I would contribute them to a vac leak somewere (causing the high readings and fluxuting or "bouncing" idle)

This should get him and everyone else started on the right foot ... im trying to help him out all I can but its hard when its on the other side of the country and I cannot see/hear/look at the car.

<TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" UNSELECTABLE="on" width="100%"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">What do you think happened, after I put the cat the AFR reads 15.7-.9 even on boost, He changed the position of the 2 sensors in the exhaust do you think that caused it to be lean. Thanks.


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So the wideband is now after the cat(mistakenly??) or am I misunderstanding?

Test the A/F with a different wideband. The AEM UEGO's have had a recent track record of being wrong/bad. Another member on this board had the same wideband with a similar problem, I put in my LM-1 and it showed that A/F's were actually perfect.

If you used air tools to install the cat then you just screwed up the wideband sensor. It is indeed sensitive as are the standard OEM oxygen sensors. Just want to clear that up. After my friend installed a AA track pipe for his Rotrex kit, the shop used an airgun to take the midpipes off, all his O2 sensors were on the blink as was his wideband. It was constantly reading lean all of a sudden. Just a suggestion.
BTW if you are running an AEM AFR gauge i believe theres a 1.8turbo Volkswagon that runs the exact same oxygen sensor which AEM uses on their widebands.

Why would an air tool screw up a wideband? What kind of air tool are you talking about? A rotary grinder? Reciprocating saw?

hes talking about impact guns, they can damage the 02's because how rough they can be