WB O2 meter effectiveness with Supercharger
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
WB O2 meter effectiveness with Supercharger
I've heard that during supercharging that the wide band O2 meter reads RICHER than actual. Is this true? Any opinions? Why does this happen? TIA
Race Director
Joined: Feb 2002
Posts: 11,268
Likes: 14
From: Honolulu, HI
Re: WB O2 meter effectiveness with Supercharger (GRX)
All I DO know is that's it's good to have :thumbs:
As far as reading richer, what do you mean? Rich as in good? or rich as is too rich <11:1
Considering the reading is a ratio of air to fuel, no matter how much air or fuel you use, you still want the optimum ratio which may be a little richer than an n/a car to keep the cylinder temps down. But cylinder temps can also be controlled with timing retard if I'm not mistaken. I'm new to tuning.
clear as mud. :crazy:
As far as reading richer, what do you mean? Rich as in good? or rich as is too rich <11:1
Considering the reading is a ratio of air to fuel, no matter how much air or fuel you use, you still want the optimum ratio which may be a little richer than an n/a car to keep the cylinder temps down. But cylinder temps can also be controlled with timing retard if I'm not mistaken. I'm new to tuning.
clear as mud. :crazy:
Drifting
Joined: Jul 2001
Posts: 1,897
Likes: 0
From: La Fontaine Indiana
Re: WB O2 meter effectiveness with Supercharger (GRX)
I've heard that during supercharging that the wide band O2 meter reads RICHER than actual.
Pure Unadulterated :bs :bs :bs :bs
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: WB O2 meter effectiveness with Supercharger (black bart)
TechEdge states: "The sensor reads the partial pressure of gases in the exhaust and infers the AFR, rather than by measuring some magical AFR directly. This may be an issue on forced induction, and in particular, on turbo-charged engines. "
See here: http://techedge.com.au/vehicle/wbo2/default.htm
:eek:
See here: http://techedge.com.au/vehicle/wbo2/default.htm
:eek:
Race Director
Joined: Feb 2002
Posts: 11,268
Likes: 14
From: Honolulu, HI
Re: WB O2 meter effectiveness with Supercharger (GRX)
hmmmmm. VERY interesting....
My theory is due to overlap this might be true. Otherwise, I don't think it's anything to be too concerned about it.
One way to tell I think, would be to go higher RPM w/ boost at 3/4 throttle. Therefore you fuel curve SHOULD be stoich. If when the boost kicks in you see it enrichen, then make appropriate corrections for it.
I could be way off....it's just a theory.
[Modified by vvv90, 7:04 PM 8/7/2003]
My theory is due to overlap this might be true. Otherwise, I don't think it's anything to be too concerned about it.
One way to tell I think, would be to go higher RPM w/ boost at 3/4 throttle. Therefore you fuel curve SHOULD be stoich. If when the boost kicks in you see it enrichen, then make appropriate corrections for it.
I could be way off....it's just a theory.
[Modified by vvv90, 7:04 PM 8/7/2003]
Drifting
Joined: Jul 2001
Posts: 1,897
Likes: 0
From: La Fontaine Indiana
Re: WB O2 meter effectiveness with Supercharger (GRX)
I went to the site but didn't find what you made reference to but I did see that they use a cheap version of the wide band sensor. The one that Accel uses for their dfi cost $400.00 so makes me wonder just how good does this cheapie work. :skep: If they are correct then they should let the rest of the world in on it because ALL professional tuners use a wide band to tune. All F1 cars run wide band they don't run to bad :D
Burning Brakes
Joined: Dec 2002
Posts: 947
Likes: 0
From: Middletown N.Y.
Re: WB O2 meter effectiveness with Supercharger (black bart)
I have the WB kit in the site mentioned above and there was nothing to cheap about it. Although I got it at a good price $420 for the kit and the cheapest I could find the O2 for was $325 from bosch, $$745 for the complete set-up and it's worked fine till now.I 'm not sure what you guys are talking about but if it's any help I've done both turbo and na cars and the sensor has responded the same, only thing is I tune turbo cars to a richer ratio usually 11.5:1-12.0:1 a little rich but safe (good power)versus 12.5:1-13.0:1 on NA.
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Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: WB O2 meter effectiveness with Supercharger (JUAN J SANCHEZ)
Look here: http://techedge.com.au/vehicle/wbo2/default.htm
About 3/4 down the page under "Wideband Sensor Positioning"
"The sensor reads the partial pressure of gases in the exhaust and infers the AFR, rather than by measuring some magical AFR directly. This may be an issue on forced induction, and in particular, on turbo-charged engines. "
:lurk:
[Modified by GRX, 9:01 PM 8/11/2003]
About 3/4 down the page under "Wideband Sensor Positioning"
"The sensor reads the partial pressure of gases in the exhaust and infers the AFR, rather than by measuring some magical AFR directly. This may be an issue on forced induction, and in particular, on turbo-charged engines. "
:lurk:
[Modified by GRX, 9:01 PM 8/11/2003]
Drifting
Joined: Jul 2001
Posts: 1,897
Likes: 0
From: La Fontaine Indiana
Re: WB O2 meter effectiveness with Supercharger (GRX)
Look here: http://techedge.com.au/vehicle/wbo2/default.htm
About 3/4 down the page under "Wideband Sensor Positioning"
"The sensor reads the partial pressure of gases in the exhaust and infers the AFR, rather than by measuring some magical AFR directly. This may be an issue on forced induction, and in particular, on turbo-charged engines. "
:lurk:
[Modified by GRX, 9:01 PM 8/11/2003]
About 3/4 down the page under "Wideband Sensor Positioning"
"The sensor reads the partial pressure of gases in the exhaust and infers the AFR, rather than by measuring some magical AFR directly. This may be an issue on forced induction, and in particular, on turbo-charged engines. "
:lurk:
[Modified by GRX, 9:01 PM 8/11/2003]
