A/F gauge readings.
05-18-2003 | 08:50 PM
#1
Thread Starter
Registered User
Joined: Feb 2003
Posts: 76
A/F gauge readings.
Hello all,
I have a greddy A/F gauge and I'm a little puzzled by its operation. The instructions say to break in the sensor by doing full throttle runs. I've been doing the best I can around town and the highway slowing down and speeding up. So I'm not really sure if its broken in, or not. Now a reading of 16 on this gauge is the leanest reading right? Like in the 5 o clock position. When i take my foot of the gas thats the reading I get. When I accelerate I get readings of 12 sometimes 14. So basically whenever I don't have my foot on the gas the warning light goes off. Anyone have any experience with this? I have a CAI, GFB BOV, Greddy Catback, stage one Utec(I've been told this map is not appropriate for an intake....so I might but the stock air box back), I also have an Up-pipe, EGT gauge knock sensor and a boost gauge. Oh and I have a 4EAT. The car has been running well, but the A/F gauge kind of annoys me. Also I see EGT readings of 750 C while driving pretty hard. The regular temperature gauge on the car reads dead center as usual. Anyhelp would be appreciated. Thanks this is a fun group to read!
I have a greddy A/F gauge and I'm a little puzzled by its operation. The instructions say to break in the sensor by doing full throttle runs. I've been doing the best I can around town and the highway slowing down and speeding up. So I'm not really sure if its broken in, or not. Now a reading of 16 on this gauge is the leanest reading right? Like in the 5 o clock position. When i take my foot of the gas thats the reading I get. When I accelerate I get readings of 12 sometimes 14. So basically whenever I don't have my foot on the gas the warning light goes off. Anyone have any experience with this? I have a CAI, GFB BOV, Greddy Catback, stage one Utec(I've been told this map is not appropriate for an intake....so I might but the stock air box back), I also have an Up-pipe, EGT gauge knock sensor and a boost gauge. Oh and I have a 4EAT. The car has been running well, but the A/F gauge kind of annoys me. Also I see EGT readings of 750 C while driving pretty hard. The regular temperature gauge on the car reads dead center as usual. Anyhelp would be appreciated. Thanks this is a fun group to read!
05-22-2003 | 09:18 AM
#4
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Posts: n/a
I'm sorry, I should have read more carefully. You said you are using a Greddy in the first post. I'm not too clear about what you are asking but I'll give you some general info. At wide open throttle, you will want to see an a/f ratio no higher than 12 to 1. It's ok if it's a little higher than that at low RPM before a lot of boost builds. I would probably tune for 11.7 to 1 while under boost to be safe. When you let off of the gas pedal, if the RPM is higher than about 1250, the computer will do coast-down fuel shutoff. Then your ratio will go off the scale high because there will be no fuel. It sounds like your Greddy will show 16 in that case. My wideband will show errror-high. During closed loop operation, you should see about 14.7 to 1. That will be at steady load, part throttle, such as cruising on the highway. It is perfectly normal to see the number jump all over the place from min to max while you are driving. It just depends on the conditions at the moment you look at the display. It sounds like everything is working.
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