Wideband?
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Joined: Oct 2006
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From: Oregon
Wideband?
So if you have a wideband, how can you tell that you have a healthy AF ratio going on during normal driving operation?
I got no love in the tech section...
I got no love in the tech section...
In because I have an interest in what the real answer is.
My brief understanding is that (and take this a grain of salt):
At idle you want to be lean at around 14'-15's
At cruise you want to be no leaner than 14's
As soon as you step on the throttle and depending on how much you start dipping into the 13's and below.
At WOT a conservative tune is in 10's. A more aggressive is in the 11's.
Originally Posted by CYD
I got a Wideband installed on Monday and it appears to be working great 
Only, I am not sure how to analyze the AF read out to know if something is up or what to look out for etc... I plan to use it to help me tune the car, but wanted to know how I can best utilize it while on the go, when not tuning. (i.e. if my it goes above/below x it's bad... but play from y-z is ok)
Edit: '93 RX7, Single Turbo. wideband sensor is located about 4ft down the pipe, before the cat/midpipe.
-At idle its stead at around 11.6/11.7
-When I am cruising around 2.5-3.5k rpm it is around 12~14.
-As I start to open the throttle for a pass, it can climb up to the low 15.x+
-On Decel/engine braking it's around 15.x
-On boost it drops to low 10.x's
So I vaguely grasp the concept of the stoich... value of 1 = 14.7 so higher than 14.7 is lean and 14.7 less= rich...kind of deal, so as far as I can tell my car is running rich for most cases except on engine braking and moderate acceleration (without boost).
Any input on my numbers, feedback on using a wideband, or advice/tips would be appreciated.
Thanks,
~CYD
Only, I am not sure how to analyze the AF read out to know if something is up or what to look out for etc... I plan to use it to help me tune the car, but wanted to know how I can best utilize it while on the go, when not tuning. (i.e. if my it goes above/below x it's bad... but play from y-z is ok)
Edit: '93 RX7, Single Turbo. wideband sensor is located about 4ft down the pipe, before the cat/midpipe.
-At idle its stead at around 11.6/11.7
-When I am cruising around 2.5-3.5k rpm it is around 12~14.
-As I start to open the throttle for a pass, it can climb up to the low 15.x+
-On Decel/engine braking it's around 15.x
-On boost it drops to low 10.x's
So I vaguely grasp the concept of the stoich... value of 1 = 14.7 so higher than 14.7 is lean and 14.7 less= rich...kind of deal, so as far as I can tell my car is running rich for most cases except on engine braking and moderate acceleration (without boost).
Any input on my numbers, feedback on using a wideband, or advice/tips would be appreciated.
Thanks,
~CYD
My brief understanding is that (and take this a grain of salt):
At idle you want to be lean at around 14'-15's
At cruise you want to be no leaner than 14's
As soon as you step on the throttle and depending on how much you start dipping into the 13's and below.
At WOT a conservative tune is in 10's. A more aggressive is in the 11's.
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Joined: Dec 2001
Posts: 14,716
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From: San Lorenzo, California
search for Chuck's (cewrx7r1) posts regarding AFRs in the PFC forum....but in general:
idle: 13-14.5 (as lean as you can make it without stumbling)
cruise: 14-15ish
boost: 12-11, depending on psi and fuel octane
idle: 13-14.5 (as lean as you can make it without stumbling)
cruise: 14-15ish
boost: 12-11, depending on psi and fuel octane
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