Good Air/Fuel Targets for Safe NA Horsepower
03-27-2008, 12:00 AM
#104
No means yes
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Well, I would understand if the sensor measured the relative quantities of O2, HC, CO, etc.. But if it's only measuring O2 that is giving you an incomplete picture... To get a lambda value from that aren't you making assumptions about combustion efficiency among other things? In that case are the UEGO sensors truly universal and are their readings equivalent between engines?
03-27-2008, 04:40 AM
#106
Essentially, 1.0 means there is no excess oxygen, and no requirement for more oxygen.
Here is an article a little more about it...
http://en.wikipedia.org/wiki/Oxygen_sensor
Cheers,
Hymee.
Last edited by Hymee; 03-27-2008 at 01:49 PM. Reason: Fixed error.
03-27-2008, 12:43 PM
#107
Alright so essentially aiming for 1.0 at WOT or cursing? From whats being said up top lower the decimal (.95) is richer and higher the decimal (1.1) leaner for lambda. My other question is does the Cobb Accessport with the tuning software have a lambda setup to tune with? I have seen DSM guys tune with lambda but never realized what was going on other then aim for .85 to .88 at WOT and close to .95 to 1.0 for cursing.
Basically what I'm saying is 12.6ish for under boost and cursing it can be ran leaner since your not trying to build boost for fuel efficiency. That was with a SAFC which sucks in my mind after seeing my buddy tune with AEM EMS....I love that lol.
Basically what I'm saying is 12.6ish for under boost and cursing it can be ran leaner since your not trying to build boost for fuel efficiency. That was with a SAFC which sucks in my mind after seeing my buddy tune with AEM EMS....I love that lol.
it already does you just need to choose that option instead
03-27-2008, 01:37 PM
#109
Alright so essentially aiming for 1.0 at WOT or cursing? From whats being said up top lower the decimal (.95) is richer and higher the decimal (1.1) leaner for lambda. My other question is does the Cobb Accessport with the tuning software have a lambda setup to tune with? I have seen DSM guys tune with lambda but never realized what was going on other then aim for .85 to .88 at WOT and close to .95 to 1.0 for cursing.
Basically what I'm saying is 12.6ish for under boost and cursing it can be ran leaner since your not trying to build boost for fuel efficiency. That was with a SAFC which sucks in my mind after seeing my buddy tune with AEM EMS....I love that lol.
Basically what I'm saying is 12.6ish for under boost and cursing it can be ran leaner since your not trying to build boost for fuel efficiency. That was with a SAFC which sucks in my mind after seeing my buddy tune with AEM EMS....I love that lol.
03-27-2008, 01:47 PM
#110
Uh, no. The sensor references outside air.
Even the article you linked indicates that. Perhaps you should read it?
The Nippondenso patent:
http://www.delphion.com/details?pn=US05518603__
"An oxygen concentration detecting device has a solid electrolyte made of a partially stabilized zirconia on one face of which is formed a measuring electrode exposed to a gas to be measured and on the other face of which a standard electrode exposed to a standard gas."
Even the article you linked indicates that. Perhaps you should read it?
The Nippondenso patent:
http://www.delphion.com/details?pn=US05518603__
"An oxygen concentration detecting device has a solid electrolyte made of a partially stabilized zirconia on one face of which is formed a measuring electrode exposed to a gas to be measured and on the other face of which a standard electrode exposed to a standard gas."
http://www.google.com/patents?vid=USPAT4915814
Cheers,
Hymee.
03-27-2008, 03:12 PM
#112
04-02-2008, 06:29 PM
#113
Bringing that which is buried in this thread to the surface.
NA makes peak power around .85 lambda on the dyno. Anything leaner does not seem to provide significantly more horsepower but does raise EGTs which should shorten the life of your cat.
NA makes peak power around .85 lambda on the dyno. Anything leaner does not seem to provide significantly more horsepower but does raise EGTs which should shorten the life of your cat.
04-02-2008, 06:39 PM
#115
Proper lambda targets are not a static value.
At WOT and RPM in a very small range, .85 - .89 produces good power.
In other ranges, .92 produces more power.
As OldDragger pointed out, don't worry about the numbers. Give the engine what it is asking for. You can only find that out with experimentation on your own.
At WOT and RPM in a very small range, .85 - .89 produces good power.
In other ranges, .92 produces more power.
As OldDragger pointed out, don't worry about the numbers. Give the engine what it is asking for. You can only find that out with experimentation on your own.
04-02-2008, 07:00 PM
#117
Is post number 5 close enough to the beginning for you?
04-03-2008, 11:08 AM
#119
Tools are coming available for all to generate their own tuned files. I would like to see work on getting the most power from a NA tune.
I am very comfortable with air/fuel ratios for our race engines (pistons, best power around 13.2 air/fuel gasoline or .9 lambda) but am curious what those who know would have to say about a good NA A/F.
What are cat and engine safe Air/Fuel targets for getting the best power from a NA RX-8?
I am very comfortable with air/fuel ratios for our race engines (pistons, best power around 13.2 air/fuel gasoline or .9 lambda) but am curious what those who know would have to say about a good NA A/F.
What are cat and engine safe Air/Fuel targets for getting the best power from a NA RX-8?
BTW, there is no safe tune for the catalytic converter that comes on our cars if you ask me.
Last edited by Nemesis8; 04-03-2008 at 11:10 AM.
11-02-2021, 06:57 AM
#121
11-02-2021, 07:10 AM
#122
The Blue Blur
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11-02-2021, 08:01 AM
#123
thx mate XD
yeah i know i was quite late with this post but i scaned a lot of postes from back to front to lock for this
i googled like 2h for this so i was frustrated
okey sorry to waste your time but i need to ask
how does changing this Volumetric efficiency change the behavior of the engine?
yeah i know i was quite late with this post but i scaned a lot of postes from back to front to lock for this
i googled like 2h for this so i was frustrated
okey sorry to waste your time but i need to ask
how does changing this Volumetric efficiency change the behavior of the engine?
11-02-2021, 08:36 AM
#124
The Blue Blur
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Right so summing up Ve is basically the ratio of air/fuel mixture the engine can suck in during intake stroke at atmospheric pressure (naturally aspirated). So increasing(forced induction) or decreasing the Ve will increase or decrease the engines power output.
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Witi (11-02-2021)
11-02-2021, 09:07 AM
#125
But what is the purpose of the map that you can edit? In the case of FI, does telling the ECU via this table change anything or will editing it have no effect?
And does it "comunicate" with the MAF sensor to calculate how much air is going into the engine?
Or is it just a "information" sheet to tell you how much bar you get at NA?
I am really sorry for all these questions but with the knowlage i have at the moment i dont understand what the purpose of it is.
And i really want to understand it so i would really appreciate if you could help me out. ^^
Last edited by Witi; 11-02-2021 at 11:43 AM.