how to run leaner?

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how to run leaner?

Postby camry90 » Mon Dec 14, 2009 2:35 pm

is there a way to adjust the AFM so your car runs a bit leaner? my car is getting 320km max with a full tank and i'm not gunning it like crazy.
i have a Innovate LM-2 and i want to know how can i adjust the air fuel mixture without a piggy back or standalone just yet...
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Postby Gary ST165 » Mon Dec 14, 2009 6:14 pm

# adjustable fuel pressure regulator: > reduce base fuel pressure, monitoring with wideband etc

# and / or tension the AFM spring 2 clicks tighter ( it will also run a fraction leaner @ idle)

# and finally, the narrow band O2 sensor as used in closed loop / cruise might be bad


(on my last refill the RC delivered 340 miles / 547km to a tankful > brimming to orange fuel light)
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Re: how to run leaner?

Postby ct27gt » Mon Dec 14, 2009 7:49 pm

camry90 wrote:is there a way to adjust the AFM so your car runs a bit leaner? my car is getting 320km max with a full tank and i'm not gunning it like crazy.
i have a Innovate LM-2 and i want to know how can i adjust the air fuel mixture without a piggy back or standalone just yet...


While I agree with Gary above, I personally believe you'd just be masking another problem. Try replacing the O2. You should be getting way more miles than slightly less than 200.
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Postby ___Scott___ » Tue Dec 15, 2009 4:04 am

Adjustments you make to the AFM will eventually only apply to open-loop mode. I say eventually because the ECU learns over time, based on feedback from the O2 sensor. So you can tighten the spring in the AFM and notice a difference, but that difference will gradually go away.

In order to effectively fool the ECU, you need to intercept the O2 signal and modify it. Then you can run leaner during closed-loop mode where most of your driving happens anyway.
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Re: how to run leaner?

Postby camry90 » Thu Dec 12, 2013 2:27 am

YES I KNOW, HOLY THREAD RESURECTION....
i've discovered a break in the O2 sensor wire near the intake plenum. now that my pig rich problem could be resolved, my Innovate LM-2 has died.....
i didn't drive the car for 3 years now since i blew my motor 3 years ago...
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Re: how to run leaner?

Postby mcesal » Thu Dec 12, 2013 2:54 am

if you turn the boost up the car will run leaner (; jk lol.
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Re: how to run leaner?

Postby underscore » Thu Dec 12, 2013 3:40 am

Yeah I thought I was running rich, then my O2 wire broke. Now I'm down near wankel engine fuel economy!
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Re: how to run leaner?

Postby klue » Thu Dec 12, 2013 11:59 pm

ct27gt wrote:
While I agree with Gary above, I personally believe you'd just be masking another problem. Try replacing the O2. You should be getting way more miles than slightly less than 200.
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Re: how to run leaner?

Postby freddie » Fri Dec 13, 2013 12:18 am

My questions is are all 02 sensors the same?

Like if I buy a universal type off ebay does it do the same job or should I look for a better one? OEM or high quality after market type?

On my car the wire to the O2 (top one) is frayed and about to break any time and the one in the bottom of the exhaust downpipe- the previous owner disconnected it. When I plug it in the engine idle become rough

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Re: how to run leaner?

Postby camry90 » Fri Dec 13, 2013 6:26 am

i had bought a cheapo O2 and it seemed to work fine. one problem, it's not in the flow of the exhaust...
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