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Old 01-15-2005, 06:48 PM   #1
Scooby Newbie
Member#: 52443
Join Date: Jan 2004
Default AFR Gauge

I just installed my K & N Typhoone intake a few days ago on an 04 STi and with someones recommendation i installed an Autometer AFR gauge, just got it working. My question is exactly how to read it.

Right now the far right LED stays green (rich). When i first start the car and run, the additional LEDS light and read just above lean. As I continue driving it leans out more and more until its almost as lean as the gauge will read, with the one LED staying on green.

Can anyone give me any pointers on how to correctly read this gauge and how serious of a problem do I have if it is indicating that its right in the middle of lean?

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Old 01-16-2005, 01:19 AM   #2
Scooby Newbie
Member#: 55197
Join Date: Feb 2004
Location: Somewhere in Time

Dont know exactly which wire you have to tap, but it looks like you tapped the wrong one. When you first put the car in the ign position the gauge will go to the lean, since there is no fuel in the exhaust. Then when you start it, since the car goes on to a close-starting loop, it will go rich. When it warms up it will start to switch between rich and lean as the mixture changes....in an Autometer a:f gauge it will swing up and down uncontrollaby since you are using the car factory O2 which is a narrow-band sensor, which is worthless for tunning. But it will work to see the mixture when you WOT as it will actually stay pretty steady in its reading...
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Old 01-16-2005, 05:37 AM   #3
Scooby Specialist
Member#: 21764
Join Date: Jul 2002
Chapter/Region: RMIC
Location: Salty Lake
Some GDM V8,
JDM Flat 4 X2


when ur car is running rich(more fuel)u will see it green, and that will be during the time ur accelirating or have the car coasting in gear. when u shift or take load of the engine it will go lean(less air).
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