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#275262 - 11th Dec 2008 11:03pm Air/Fual Ratio gauges?
Dave100e Offline

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Registered: 14th Jul 2008
Posts: 690
Loc: Greasby
I was looking at one of those Air/Fuel ratio gauge kits you can buy now. Does anyone know how theyre fitted? I always thought they where a sensor in the exhaust at some point and if thats the case i wont bother, dont fancy making any holes like.

Cheers smile
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#275265 - 11th Dec 2008 11:42pm Re: Air/Fual Ratio gauges? [Re: Dave100e]
StuyMac Offline

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Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Some use the cars OEM Lambda sensor - if you car doesnt have one, then one will need fitting to the exhaust.

They are only as accurate as the sensor, and if they use the OEM sensor - thats not very accurate....

The expensive ones use a wideband lambda - these are accurate enough to tune with, but the price difference is huge...

One using a wideband lambda is 200+, one using a std lamdba 30ish.

TBH Id only use one if you planning on using it to tune the car, in which case spend out on a good one, if your checking for problems, compromise and get an EGT gauge instead at 80-100
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#276155 - 15th Dec 2008 1:18am Re: Air/Fual Ratio gauges? [Re: StuyMac]
DavidB Offline
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Registered: 7th Dec 2003
Posts: 5608
Loc: Bebington, Wirral
Yeah, basic ones don't really tell you anything. If you know you've got bad fuelling, it's not going to tell you much!

I think the cheap one gets you a probe as well, I have one in my garage, I will get a pic. smile
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#280571 - 5th Jan 2009 1:24pm Re: Air/Fual Ratio gauges? [Re: DavidB]
DavidB Offline
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Registered: 7th Dec 2003
Posts: 5608
Loc: Bebington, Wirral
I dug these out:

The Air/Fuel gauge has four wires (going to the ECU) and an exhaust probe!



The one on the right is a 'lean' gauge, which goes red/green depending on the fuelling (for turbo engines).

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