What kind of AFR readings are you getting durring cruise/idle? - Ford Mustang Forum
 
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post #1 of 13 (permalink) Old 02-09-2010 Thread Starter
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What kind of AFR readings are you getting durring cruise/idle?

I just installed the Wideband kit from Aeroforce getting ready for the supercharger but I don't think it's reading correctly.

On the first drive with it I was getting around 14.2 at cruise/idle. I thought that was a little off so I did a recalibration of the unit after the car had sat overnight and the exhaust gases had dissipated.

On the drive into work I was reading between 14.5-14.8 which is exactly what I expected to see. On the drive home those readings changed to bouncing suddenly between 14.8 and 15.4.

Today before I went into work I did another recal before starting the engine and the sensor read 15.4 almost the entire drive in while the fuel system was in closed loop operation with the occasional blip to 14.8 and back again.

This is still a factory tune with a factory setup but it seems to be getting leaner as I go. I just wanted to know what others are experiencing.

Thanks.
-HD

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post #2 of 13 (permalink) Old 02-09-2010
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your AFR readings don't mean a whole bunch at cruise and idle. I have seen modified turbo cars AFR gauge jump all around at idle. Some have built their own AFR meter to only take readings above a certain voltage so they don't have to see all the lights at idle and cruise. but at WOT they see the gauge light up.

I wouldn't try to calibrate the gauge for cruise or idle. your car would need to be calibrated for wide open throttle after the supercharger is installed.


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post #3 of 13 (permalink) Old 02-09-2010
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Those readings are nearly identical to what I get under the same conditions. At wide open throttle the AFR would hold pretty steady at 12.5 before I installed my supercharger. Now that I have the supercharger it averages around 11.5 but at times I have seen it dip down close to 11. The numbers on the Aeroforce matched the dyno both times exactly.

2008 Vapor Silver GT, 5 Spd Manual Brenspeed Stg 1 Edelbrock E Force, Liberty built 3650 trans w/26 spline input shaft, N2MB WOT Box, GT 500 Fuel System, Kooks Long Tubes, Dynotech Drive Shaft, 3:73 Gears, Steeda UCA & LCAs, BMR LCA Relocation Brackets, Exedy Mach 500 clutch, Nitto Drag Radials


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post #4 of 13 (permalink) Old 02-09-2010 Thread Starter
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Those readings are nearly identical to what I get under the same conditions. At wide open throttle the AFR would hold pretty steady at 12.5 before I installed my supercharger. Now that I have the supercharger it averages around 11.5 but at times I have seen it dip down close to 11. The numbers matched the dyno both times.
Whew, that makes me feel better knowing you're running the same Aeroforce wideband kit. I also see a steady 12.5 @ WOT / Naturally aspirated (that's about to change!) I thought maybe I'd bjorked my install expecting it to read a steady 14.7:1 I guess maybe I should just relax a little.

<--Has very little faith in his own wrenching abilities but still trys and regularly F's things up anyway:nogrinner!

Thanks!
-HD
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post #5 of 13 (permalink) Old 02-09-2010
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Whew, that makes me feel better knowing you're running the same Aeroforce wideband kit. I also see a steady 12.5 @ WOT / Naturally aspirated (that's about to change!) I thought maybe I'd bjorked my install expecting it to read a steady 14.7:1 I guess maybe I should just relax a little.

<--Has very little faith in his own wrenching abilities but still trys and regularly F's things up anyway:nogrinner!

Thanks!
-HD
Sounds like you got everything set up correctly.

2008 Vapor Silver GT, 5 Spd Manual Brenspeed Stg 1 Edelbrock E Force, Liberty built 3650 trans w/26 spline input shaft, N2MB WOT Box, GT 500 Fuel System, Kooks Long Tubes, Dynotech Drive Shaft, 3:73 Gears, Steeda UCA & LCAs, BMR LCA Relocation Brackets, Exedy Mach 500 clutch, Nitto Drag Radials


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post #6 of 13 (permalink) Old 02-09-2010
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Idle and cruise will range from 14.3-15.3. Nothing to worry about.

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post #7 of 13 (permalink) Old 02-09-2010
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Idle and cruise will range from 14.3-15.3. Nothing to worry about.

I have the AeroForce wideband as well. I've noted the same here....

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post #8 of 13 (permalink) Old 02-09-2010
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You may also notice that when the car is cold (open loop) you may see it peg lean at 16.0.

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post #9 of 13 (permalink) Old 02-09-2010
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You may also notice that when the car is cold (open loop) you may see it peg lean at 16.0.
I have noticed that. What I do not understand though is that the car's exhaust smells rich at idle when it is cold even when the AFR is at 16. I can tell because when I crank it up cold it is confined in the garage. Once it warms up and the AFR drops into the 14 range, it smells less rich. I can't seem to make any sense of that.

2008 Vapor Silver GT, 5 Spd Manual Brenspeed Stg 1 Edelbrock E Force, Liberty built 3650 trans w/26 spline input shaft, N2MB WOT Box, GT 500 Fuel System, Kooks Long Tubes, Dynotech Drive Shaft, 3:73 Gears, Steeda UCA & LCAs, BMR LCA Relocation Brackets, Exedy Mach 500 clutch, Nitto Drag Radials


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Quote:
Originally Posted by KDT View Post
I have noticed that. What I do not understand though is that the car's exhaust smells rich at idle when it is cold even when the AFR is at 16. I can tell because when I crank it up cold it is confined in the garage. Once it warms up and the AFR drops into the 14 range, it smells less rich. I can't seem to make any sense of that.
Mine does the same thing.

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i have an anolog AEM gauge. i notice it will jump around sometimes at idle/cruse. usualy it will hover in the high 14's but i have seen it bounce from low 14's to mid 15's for no aparent reason during driving.

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The wide bands sensor is just like any other exaust gas sensors , it needs time to warm up, they dont work cold thats why they have a heater element, it will peg full lean cold. At room temp it only takes about 30 seconds or so they say, so in cold weather it could be a min, with all the cold metal.

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The wide bands sensor is just like any other exaust gas sensors , it needs time to warm up, they dont work cold thats why they have a heater element, it will peg full lean cold. At room temp it only takes about 30 seconds or so they say, so in cold weather it could be a min, with all the cold metal.
Thanks for the info, now it makes sense to me.

2008 Vapor Silver GT, 5 Spd Manual Brenspeed Stg 1 Edelbrock E Force, Liberty built 3650 trans w/26 spline input shaft, N2MB WOT Box, GT 500 Fuel System, Kooks Long Tubes, Dynotech Drive Shaft, 3:73 Gears, Steeda UCA & LCAs, BMR LCA Relocation Brackets, Exedy Mach 500 clutch, Nitto Drag Radials


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