Tricking your 02 sensor - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 10-30-2005, 02:33 PM   #1
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Tricking your 02 sensor

Hmm, don't reccomend you do this, for emissions reasons, but I wanna get the idea out there.

<a href=http://better-mileage.com/memberadx.html target=_blank>O2 tricker</a>

In any case, the point it makes about water injection is a good one. If you really wanna take advantage of water injection for fuel economy you need to be able to control fuel injection (and timing), but I plan on doing that through my ecu, which is the uber safe way.
__________________

SVOboy is offline   Reply With Quote
Old 01-01-2006, 10:20 PM   #2
Registered Member
 
Join Date: Dec 2005
Posts: 24
Country: United States
Oxygen sensor override

Some people consider this to be the first and most important step to increase gas mileage. George Wiseman says "fuel injection systems are actually designed to prevent efficient combustion!" Read about the Electronic Fuel Injection Enhancer (EFIE) here:
http://www.eagle-research.com/fuelsav/efie.html

A low tech approach is to wrap the oxygen sensors in the exhaust pipe with several layers of aluminum foil to trick it into thinking the mix is too rich.
__________________

GasSavers_JustMe is offline   Reply With Quote
Old 01-02-2006, 05:47 AM   #3
Moderator
 
GasSavers_DaX's Avatar
 
Join Date: Oct 2005
Posts: 1,209
Country: United States
...or you could get an EMS

...or you could get an EMS and tune your engine then run in open loop all the time.
GasSavers_DaX is offline   Reply With Quote
Old 01-02-2006, 06:16 AM   #4
FE nut
 
diamondlarry's Avatar
 
Join Date: Sep 2005
Posts: 1,020
Country: United States
I know of someone who does

I know of someone who does something like that. They unhooked the O2 sensor and came up with a way to dial in whatever longterm trim level they wanted. The only problem with the way it's done is you have to find a compromise that makes the car driveable for different driving conditions. His method was more or less a proof of concept type thing.
__________________
Horsepower is how hard you hit the wall, torque is how much of the wall you take with you.

2007 Prius,



Team Slow Burn
diamondlarry is offline   Reply With Quote
Old 01-02-2006, 10:30 AM   #5
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Quote:...or you could get an

Quote:
...or you could get an EMS and tune your engine then run in open loop all the time.
I'm with you! I posted this before I knew anything about engine management,
SVOboy is offline   Reply With Quote
Old 01-02-2006, 07:44 PM   #6
Registered Member
 
Join Date: Dec 2005
Posts: 48
Country: United States
2-3 months ago i tried an

I call this approach "The Poor Man's Chip-Tuning"

2-3 months ago i tried an electronic circuit to alter oxygen sensor's signals to provide fuel economy. And it worked providing %5 fuel economy at least!

Let me explain:
The circuit has an ON-OFF switch and a potentiometer and i installed it to the glass holder of my car and ran the wires to the engine bay. Device draws its electricity from the cigarette lighter in order to work.

I made 2 tests with both device is OFF and ON.
By using Cruise Control set to 110kmh/68mph I drove the same length road from point A to A on the highway, and did the same test when device is ON all the time. And also my car has a very accurate trip computer.

Test track was approximately 90km/56miles long and it's a 3x3 lanes road with both slopes going downhill and uphill.. by the way no traffic at all.

When going uphill unfortunately the device causes engine to stall very much and auto transmission shifts to upper gear and also causes engine to switch to "open loop" all the time.

If i made the tests switching ON the device only going downhill and level road and switching OFF during uphills i would guess it would make a more difference then %5.. maybe %10 or %20 or even more!

And unfortunately this device reduces the drivability and driving pleasure of the car when cruise control is not used and if also the car has an automatic transmission.

I tried to use it during city stop-go driving but it caused engine to stall so much and when i step on gas pedal more it caused engine to switch to open loop (which causes a sudden power increses unexpectedly) and also causes auto trans to downshift too early unexpectantly.

And i do not use it anymore which i also fear that this device causes engine to burn too lean fuel and i am afriad of causing permanent damage to pistons, rings, and valve heads because of high temperature.

By the way the device is still installed on my car's glass holder ready to be plugged in and switched ON.. i am very lazy

But i want to ask you a question:

How dangerous is lean burn ?
Does it really causes expensive damage to the combustion chamber elements ? or is it an urban myth ? And also i must mention that my car has a "knock control" mechanism. Does having "knock control" feature reduces the risks of lean burn ?
Capcom is offline   Reply With Quote
Old 01-03-2006, 11:36 AM   #7
FE nut
 
diamondlarry's Avatar
 
Join Date: Sep 2005
Posts: 1,020
Country: United States
I would first suggest that

I would first suggest that you use less voltage and try it that way first. Also, the fact that it is switching to open loop means that you won't be able to run the engine too lean. When the ECU goes inton open loop itm is running on a set of pre-programmed settings. If anything you may be running on the rich side in open loop. The pre-programmed settings are usually biased toward rich rather than lean.
__________________
Horsepower is how hard you hit the wall, torque is how much of the wall you take with you.

2007 Prius,



Team Slow Burn
diamondlarry is offline   Reply With Quote
Old 01-31-2007, 08:01 AM   #8
Registered Member
 
SIFLIGINIUS's Avatar
 
Join Date: Dec 2006
Posts: 3
Country: United States
Anyone Has Built An Efie?

Hi!
I put my answer here because i think you know a lot about EFIE.

I built one with additional AFRD into but i need to compare results with anyone has built one.

Thankfully



Quote:
Originally Posted by diamondlarry View Post
I would first suggest that you use less voltage and try it that way first. Also, the fact that it is switching to open loop means that you won't be able to run the engine too lean. When the ECU goes inton open loop itm is running on a set of pre-programmed settings. If anything you may be running on the rich side in open loop. The pre-programmed settings are usually biased toward rich rather than lean.
__________________

SIFLIGINIUS is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
km/l possible? Scottrates Fuelly Web Support and Community News 4 10-05-2010 11:14 PM
No EPA Est for 2007 Chrysler Town & Country jklaiber Fuelly Web Support and Community News 1 08-23-2008 01:15 AM
Conversion successful Matt Timion Fuelly Web Support and Community News 12 05-18-2006 03:24 PM
Electric panel heaters GasSavers_JustMe General Discussion (Off-Topic) 0 01-03-2006 04:43 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 11:31 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.