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EFIE vs O2 Sensor mod?
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stevekos7 Offline
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Post: #1
EFIE vs O2 Sensor mod?
Hi all. As I am getting ready to install my latest gen into my vehicle, I want something cleared up. I have been sold a 'Oxygen Sensor Emulator' from a friend who installs LPG systems. He says it overrides the O2 sensor's control of the EFI computer and allows a leaner exhaust (which is what LPG produces). I want to know whether anyone has used one of these, and whether I will need both this and an EFIE as well.
07-15-2008 08:54 PM
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RDKamikaze Offline
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Post: #2
RE: EFIE vs O2 Sensor mod?
I have tried one electrical o2 sensor mod, but it was almost 2 years ago. Biggest waste of $35 of my life...live and learn. Maybe it's just my car and VVT-i, but it threw a code whenever I stepped on the gas a bit. I later found out that mechanical o2 simulators are the way to go!

Are o2 gappers effective with HHO generators? I believe so, but some don't. Be sure to do a search on EFIE vs. o2 extenders and hopefully you'll find plenty of threads debating them :P . My car likes it though...

My Car:
2006 Toyota Solara 2.4L 4cyl.
-Aftermarket (JPP) header
-DNX exhaust
-Injen Short-Ram Intake (SRI)

Add yourself to the HHO member map!!
07-16-2008 01:40 AM
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ncmountainmadness Offline
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Post: #3
RE: EFIE vs O2 Sensor mod?
Eagle Research's EFIE is a proven device amongst the HHO or combustion enhancement crowd. However, as I've read lately quite hard to obtain due to the demand. Dont know about any others

Keep in mind that there are several more sensors that ALL must also be dealt with. HHO,LPG, Preheat of fuel, Vapor injection water or fuel, all enhance combsution in there own ways. All sensors work together to tell the ECU how to alter the injectors. I suggest reading the post here by MPG Mike, Tuning for mileage. The only sensor that at present is not 100% controllable on all cars, is an AFR sensor. AFR sensors are a more modern/differnet version of 02 sensors. Luckily on a 2000 you might not have to deal with that.
07-16-2008 05:06 AM
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stevekos7 Offline
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RE: EFIE vs O2 Sensor mod?
ncmountainmadness Wrote:Eagle Research's EFIE is a proven device amongst the HHO or combustion enhancement crowd. However, as I've read lately quite hard to obtain due to the demand. Dont know about any others

Keep in mind that there are several more sensors that ALL must also be dealt with. HHO,LPG, Preheat of fuel, Vapor injection water or fuel, all enhance combsution in there own ways. All sensors work together to tell the ECU how to alter the injectors. I suggest reading the post here by MPG Mike, Tuning for mileage. The only sensor that at present is not 100% controllable on all cars, is an AFR sensor. AFR sensors are a more modern/differnet version of 02 sensors. Luckily on a 2000 you might not have to deal with that.

Mine is a 1993 Mitsubishi Pajero 4wd 3.0lt. I don't know exactly what sensors it has. I know it has an O2 sensor and some kind of airflow sensor just after the air filter body. But I think that's all. I was told by my friend that the O2 sensor would be the only one I would need to worry about, and that the emulator would do the trick. Maybe I should talk to a Mitsubishi specialist to find out exactly what sensors I need to deal with.
07-16-2008 04:05 PM
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colchiro Offline
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Post: #5
RE: EFIE vs O2 Sensor mod?
Steve you don't want to replace your (pre-cat) o2 sensor, one of the major inputs to your car's computer.

That o2 device is designed for the post-cat o2 sensor when you remove a catalytic converter or have problems with a CEL (check engine light) when you add headers or a turbo.

The pre-cat sensor (the sensor between the engine and the cat) determines the air-fuel mixture. The other one just reports the health of your catalytic converter.

Rick

Links: Documents / Tuning for Mileage | Toyota Sensors | Autoshop Sensor Tutorials
07-16-2008 04:50 PM
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stevekos7 Offline
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RE: EFIE vs O2 Sensor mod?
colchiro Wrote:Steve you don't want to replace your (pre-cat) o2 sensor, one of the major inputs to your car's computer.

That o2 device is designed for the post-cat o2 sensor when you remove a catalytic converter or have problems with a CEL (check engine light) when you add headers or a turbo.

The pre-cat sensor (the sensor between the engine and the cat) determines the air-fuel mixture. The other one just reports the health of your catalytic converter.

Ok, but I think I only have one O2 sensor (pre cat). The emulator is supposed to maintain a constant reading to the computer to allow a leaner air/fuel exhaust mixture than would normally be allowed before the computer compensates with extra fuel.

I will find out from the manufacturer exactly what the thing is supposed to do before I install it.

Thanks Rick.
07-16-2008 08:05 PM
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colchiro Offline
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Post: #7
RE: EFIE vs O2 Sensor mod?
Ok.

Best to check with them than assume my guess is right.Wink

Rick

Links: Documents / Tuning for Mileage | Toyota Sensors | Autoshop Sensor Tutorials
07-18-2008 05:56 PM
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hoozadoctor Offline
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Post: #8
RE: EFIE vs O2 Sensor mod?
Hi Steve
I am currently using n oxgen sensor simulator. i beleive it is as good as or better than most EFIE because it gives out a constant signal, that is a predefined signal regardless of what is actually happening in the exhaust. It doesn't not use your oxygen sensor at all. the one i purchased is made by a company in Hungry. As well as having the electronics to simulate a 02 sensor it has electronics to simulate the heater if your existing sensor has a heater.

As for other sensors in your car you more than likely have

Map sensor
MAF Sensor
ECT Sensor
ACT Sensor
EGR sensor
TP sensor
BAP sensor

There is other sensors as well for fuel and gearbox and various component but we only need concern our selves with the ones i have listed.
07-19-2008 03:41 AM
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hoozadoctor Offline
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RE: EFIE vs O2 Sensor mod?
ncmountainmadness Wrote:Eagle Research's EFIE is a proven device amongst the HHO or combustion enhancement crowd. However, as I've read lately quite hard to obtain due to the demand. Dont know about any others

Keep in mind that there are several more sensors that ALL must also be dealt with. HHO,LPG, Preheat of fuel, Vapor injection water or fuel, all enhance combsution in there own ways. All sensors work together to tell the ECU how to alter the injectors. I suggest reading the post here by MPG Mike, Tuning for mileage. The only sensor that at present is not 100% controllable on all cars, is an AFR sensor. AFR sensors are a more modern/differnet version of 02 sensors. Luckily on a 2000 you might not have to deal with that.

I am sorry madness but this is NOT correct. LPG (Liquid Petrolem Gas) which is a concoction of gas comprising mostly propane or a mixture of propane and butane, is NOT an enhancement but a fuel in it's own right.

It does not even use the injectors in fact the injectors are disabled while the motor is running on LPG.

i suggest it would be an idea for you guys to get a copy of the origian work shop manual made by the car company and it will give you all the details on the sensors and wiring diagrams. You will need this manual to be able to use the correct value of resistors etc to modify the signals going to the ECU from the various sensors.

Doc
07-19-2008 03:51 AM
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stevekos7 Offline
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Post: #10
RE: EFIE vs O2 Sensor mod?
hoozadoctor Wrote:
ncmountainmadness Wrote:Eagle Research's EFIE is a proven device amongst the HHO or combustion enhancement crowd. However, as I've read lately quite hard to obtain due to the demand. Dont know about any others

Keep in mind that there are several more sensors that ALL must also be dealt with. HHO,LPG, Preheat of fuel, Vapor injection water or fuel, all enhance combsution in there own ways. All sensors work together to tell the ECU how to alter the injectors. I suggest reading the post here by MPG Mike, Tuning for mileage. The only sensor that at present is not 100% controllable on all cars, is an AFR sensor. AFR sensors are a more modern/differnet version of 02 sensors. Luckily on a 2000 you might not have to deal with that.

I am sorry madness but this is NOT correct. LPG (Liquid Petrolem Gas) which is a concoction of gas comprising mostly propane or a mixture of propane and butane, is NOT an enhancement but a fuel in it's own right.

It does not even use the injectors in fact the injectors are disabled while the motor is running on LPG.

i suggest it would be an idea for you guys to get a copy of the origian work shop manual made by the car company and it will give you all the details on the sensors and wiring diagrams. You will need this manual to be able to use the correct value of resistors etc to modify the signals going to the ECU from the various sensors.

Doc

I was talking with my mechanic today, and his suggestion is to install the HHO system with no enhancements to sensors, and to tackle them one by one as required. He said that most cars' O2 sensors die at around 60,000 to 100,000 miles anyway, and mine has never been checked or replaced. Also, the cat converters usually burn out around this time also. He said that my vehicle may run fine with the Hydrogen booster attached without sensor modification, and if no improvements are noticed he will help with mods as required. My LPG system is fairly new, and the guy who installed that recommended the O2 emulator, but he also said that it may not be necessary. I think I will follow their advice as a start.

He did recommend installing Iridium spark plugs at the same time as I install the Hydrogen system. He says that they should maximise the benefits, sometimes on their own they give a 10% or more economy improvement anyway.
07-19-2008 05:50 AM
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