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Air/Fual Ratio gauges? #275262
11th Dec 2008 11:03pm
11th Dec 2008 11:03pm
Joined: Jul 2008
Posts: 690
Greasby
Dave100e Offline OP

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Dave100e  Offline OP

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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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Re: Air/Fual Ratio gauges? [Re: Dave100e] #275265
11th Dec 2008 11:42pm
11th Dec 2008 11:42pm
Joined: Nov 2003
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StuyMac Offline
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StuyMac  Offline
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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


What If There Were No Hypothetical Questions?
Re: Air/Fual Ratio gauges? [Re: StuyMac] #276155
15th Dec 2008 1:18am
15th Dec 2008 1:18am
Joined: Dec 2003
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Bebington, Wirral
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DavidB Offline
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DavidB  Offline
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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


"C20 LET bang"
Re: Air/Fual Ratio gauges? [Re: DavidB] #280571
5th Jan 2009 1:24pm
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Bebington, Wirral
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DavidB Offline
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DavidB  Offline
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Bebington, Wirral
I dug these out:

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

[Linked Image]

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

[Linked Image]


"C20 LET bang"

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