AFR for WOT and Idle question
10-28-2009, 07:08 PM
#1
AFR for WOT and Idle question What's a good idle AFR and what's a good WOT AFR
I want to double check my numbers of 14.5 at idle and 12.7 at WOT?
ive been using a tailpipe sniffer so how much differance will i see if i used the header bung?
I want to double check my numbers of 14.5 at idle and 12.7 at WOT?
ive been using a tailpipe sniffer so how much differance will i see if i used the header bung?
10-28-2009, 07:26 PM
#2
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For MOST street cars, stoich is where you want idle to be....some combinations may do better with a slightly richer ratio, but stoich is where it's at for most gas cars.
12.7 is fine for WOT, best way to find out is at the track or on a dyno.
Your air fuel is fine
It's commonly stated that before cats is going to be a more accurate reading than after the cats.
12.7 is fine for WOT, best way to find out is at the track or on a dyno.
Your air fuel is fine
It's commonly stated that before cats is going to be a more accurate reading than after the cats.
10-28-2009, 07:42 PM
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A/Fs sound good. Do you have cats? Typically you could end up with a leaner mixture by the time it gets to the end of the tail pipe, but this varies a bit from car to car. I'd get some readings from the collector.
11-06-2009, 07:42 AM
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Phil, just out of curiosity, do you mean the O2 sensor location with your wideband, or the O2 narrowband voltage reading?
..WeathermanShawn..
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11-25-2009, 11:43 AM
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It sounds like he is using the WB clipped to the tailpipe to measure AFR and wants to know the difference if measured at the standard WB O2 bung location.
FWIW - Each car is different but my car likes to idle between 14.8-15.2 and runs good at 12.8-13.1 at WOT. I don't have cats.
FWIW - Each car is different but my car likes to idle between 14.8-15.2 and runs good at 12.8-13.1 at WOT. I don't have cats.
11-25-2009, 06:35 PM
#10
hey boys
First I was collecting from the tail pipe, and was getting good readings.
Knowing I was getting a little leaner reading from my tail pipe clamp, I hooked up my wideband to the header. Before I had a chance to get a reading from the header, my computer crashed, but I had it dyno tuned and was about 12.5 at WOT ( from the tail pipe.)
I thought I was real fat because I was getting a reading of 15 AFR @ cruising, then I realized after my computer crashed, I had not reloaded the wideband software. Im commanding 1.26 on my fuel ratio table @ WOT.
Now that my computer is up to speed again. I need to hook everything back up. Right now the car is up on jack stands having curb rash repaired and new shoes put on.
First I was collecting from the tail pipe, and was getting good readings.
Knowing I was getting a little leaner reading from my tail pipe clamp, I hooked up my wideband to the header. Before I had a chance to get a reading from the header, my computer crashed, but I had it dyno tuned and was about 12.5 at WOT ( from the tail pipe.)
I thought I was real fat because I was getting a reading of 15 AFR @ cruising, then I realized after my computer crashed, I had not reloaded the wideband software. Im commanding 1.26 on my fuel ratio table @ WOT.
Now that my computer is up to speed again. I need to hook everything back up. Right now the car is up on jack stands having curb rash repaired and new shoes put on.
