O2 Experiment 06 Xa Scion

[n0rt0npr0]

You have to connect the EFIE to all upstream o2 sensors. Don't worry about the downstream sensor that is after the cat.

edit: Well after looking at my factory service manual, my chevy would need both sensors tapped into EFIE...

Originally Posted by holypaulie

How many oxygen sensors do you have? My car for exemple have two of them, so this mean I'd have to connect EFIE device to each one.

[Jim Dunlop]

Does running lean introduce the risk of burning a hole in your cylinder wall due to higher temperatures and free oxygen, or is that just a myth?

[varg]

Yes, it does, but not at the "lean" we're talking about. I'm guessing we're seeing somewhere around 15-16:1 with the EFIE, which isn't really all that dangerous. If we were to lean out to say, 20:1 then I'd definitely suggest water injection to prevent said burning of cylinders.

[holypaulie]

Originally Posted by cfg83

itjstagame -



I have the same EFIE, but I haven't installed it yet because I wanted to finish my digital A/F ratio gauge (a kit you solder). With the gauge I am able to "see" what the EFIE is doing in real A/F ratio numbers, not just flashing lights. Right now I am breaking the A/F gauge in and I can see a dominant 14.7 ratio over time. Once I attach the EFIE, I will shoot for a 15.5 ratio and see what happens.

So many projects, so little time ...

CarloSW2

cfg83 you have p.m. thanks in advance

[Zerfstead]

Well I have been testing the EFIE on my Scion and have added a 5K resistor in parallel with the IAT sensor. this raised the IAT by about 8-10 deg F. A simple mod. I just pushed a T-pin through the two wires on the MAF wiring harness and inserted the resistor leads in the holes. A temporary installation to test for a ohm value I can live with.

So, with the EFIE set at 300 mv and the IAT at +10 F. here is how it looks.

Houston, TX Morning commute OAT 88 F for 38 miles.
All tires at max rated psi 45
Cruise ON for freeway
AC on
Speed for cruise = 60 mph
ave cruise mpg = 52
overall trip = 48.6
I forgot the ave speed number on the scangage I guess it around 38-40

These mods are conservative settings, yet are producing meaningful improvements in mpg.
Without these mods I could expect the freeway ave to be around 38-42.
I am reminded however... that the driving pattern, technique and other factors have a great deal to do with the final amount of gas consumed.
The greatest gains in fuel economy still come from me SLOWING DOWN and driving the speed limit.

[holypaulie]

Originally Posted by Zerfstead

Well I have been testing the EFIE on my Scion and have added a 5K resistor in parallel with the IAT sensor. this raised the IAT by about 8-10 deg F. A simple mod. I just pushed a T-pin through the two wires on the MAF wiring harness and inserted the resistor leads in the holes. A temporary installation to test for a ohm value I can live with.

So, with the EFIE set at 300 mv and the IAT at +10 F. here is how it looks.

Houston, TX Morning commute OAT 88 F for 38 miles.
All tires at max rated psi 45
Cruise ON for freeway
AC on
Speed for cruise = 60 mph
ave cruise mpg = 52
overall trip = 48.6
I forgot the ave speed number on the scangage I guess it around 38-40

These mods are conservative settings, yet are producing meaningful improvements in mpg.
Without these mods I could expect the freeway ave to be around 38-42.
I am reminded however... that the driving pattern, technique and other factors have a great deal to do with the final amount of gas consumed.
The greatest gains in fuel economy still come from me SLOWING DOWN and driving the speed limit.

Zerfstead you have a PM

[cfg83]

Zerfstead -

Originally Posted by Zerfstead

Well I have been testing the EFIE on my Scion and have added a 5K resistor in parallel with the IAT sensor. this raised the IAT by about 8-10 deg F. A simple mod. I just pushed a T-pin through the two wires on the MAF wiring harness and inserted the resistor leads in the holes. A temporary installation to test for a ohm value I can live with.

There is the possibility that the IAT resistor mod is fooling the ScanGauge, at least for some drive-trains :

Batman we have lean burn! 49.6 mpg!
http://www.gassavers.org/showthread.php?t=2160

So, with the EFIE set at 300 mv and the IAT at +10 F. here is how it looks.

Houston, TX Morning commute OAT 88 F for 38 miles.
All tires at max rated psi 45
Cruise ON for freeway
AC on
Speed for cruise = 60 mph
ave cruise mpg = 52
overall trip = 48.6
I forgot the ave speed number on the scangage I guess it around 38-40

These mods are conservative settings, yet are producing meaningful improvements in mpg.

I agree with being conservative, better (engine) safe than sorry. I know the EFIE is working because I can see the AF ratio go lean and feel the engine lose power, but the ScanGuage may not be recording the effect :

Just ordered an EFIE - BrightGreen FeverBuster
http://www.gassavers.org/showpost.ph...87&postcount=5

Without these mods I could expect the freeway ave to be around 38-42.
I am reminded however... that the driving pattern, technique and other factors have a great deal to do with the final amount of gas consumed.
The greatest gains in fuel economy still come from me SLOWING DOWN and driving the speed limit.

My Theory : You're IAT resistor mod is not working, but the ScanGauge is reacting to it and improving your displayed MPG. You're EFIE is working, but the ScanGauge is not recording it's effect. Result? The ScanGauge is wrong but you are still getting better MPG.

This message has been brought to you by the Better Confusion Bureau, .

CarloSW2

[bfg9000d]

overtime this is gonna cost you allot more then your saving in fuel.

[whtxb]

Hi sir. I for one would like to see documention concerning your listing. I'm anticipating some mods to my XB and would like to know if I'm slipping into deep water! Please advise, Ron.