Replacing the O2 Sensor

[crusher773]

Well once I did it my MPGs definetely increased. More airflow equals more horsepower and in this case better MPGs.

[Pu241]

Well once I did it my MPGs definetely increased. More airflow equals more horsepower and in this case better MPGs.

Need data!
Join fuelly and enter your mileage and fuel data with any notes as to maintenance, repair, replacement, driving condition, speed, etc.
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Typically, an increase in HP will reduce MPG.
I do have a few extra VAF's around so I could "open one up" for a test.

[boydg1]

.... Here this thread should help you with your "VAF" evaluations: http://www.automecanico.net/07/esqfrdtex05.jpg

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Need data!
Join fuelly and enter your mileage and fuel data with any notes as to maintenance, repair, replacement, driving condition, speed, etc.
Then post the link in your signature, like mine and other here have.

Typically, and increase in HP will reduce MPG.
I do have a few extra VAF's around so I could "open one up" for a test.

[Pu241]

Not what I had in mind when I said I was going to "open one up", but very useful none the less!

Thanks

[FestYboy]

John, if you don't change anything about the engine and reduce it's pumping losses, you'll gain hp AND mpg (engine has become more efficient), the same goes for un-restricting the exhaust, increasing compression, reduce internal friction OR somehow increasing cylinder pressure before and durring the cumustion event (increase in torque).

[200KGPGTP]

I was gonna say....

An increase in HP is not ALWAYS detrimental to MPG. If it is more peppy/responsive, you won't need to be on the accelerator pedal so much......... which = higher mpg.

[Pu241]

John, if you don't change anything about the engine and reduce it's pumping losses, you'll gain hp AND mpg (engine has become more efficient), the same goes for un-restricting the exhaust, increasing compression, reduce internal friction OR somehow increasing cylinder pressure before and durring the cumustion event (increase in torque).

I completely agree reduce pumping losses/increase volumetric efficiency and you should see increased HP and MPG.
Arty, when you unrestricted exhaust and/or intake when does that change show?
Typically, it will not manifest itself till higher RPM, so in the typical range of RPM's seen in daily driving, say 2 -3,000 RPM, you're not going to see much, if any, MPG improvement. Coupled with the fact most people will be hard pressed not to engage the extra "get up and go" at the higher RPM, I can actually see most people losing MPG, unless it is the primary objective.
That said, I'm wondering about a controlled refining/tuning of the A/F ratio, something like that used in the "HHO" fraud. Where by we lean out the A/F ratio, subject to some reasonable limits set by exhaust temp and head/engine temp.

200KGPGTP, I know this directly affects your bottom line so I suspect you are more diligent than most in your driving. But with the increase in ambient temps you will see an increase in MPG, which could be taken for and increase in MPG from your modifications. Just saying other factors are involved, it is rare in the real world we see a direct correlation without other factors playing a roll.

[crusher773]

I have a fuelly with about 4 or 5 fill ups with notes I don't know how to add it to my sig though. My driving is 90% hwy and I keep it around 60. Got some pretty decent hills to and from work though.

[crazyrog17]

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[crusher773]

Alright got it. I've taken pretty good notes on most of them.

[Pu241]

There you go!

Thanks for the help hand crazyrog17!

[boydg1]

.... Update ....

.... I preference this Update with "POSTS" #6,#7,#8,#9 and #10 of this thread. I replaced the BOSH O2 senor with the DENSO O2 part# 234-1000, see pics. It's looking like my gas millage is up considerably three to four miles per gallon using the DENSO rather than the BOSH. And maybe more with time. I think that's pretty good considering all the blow-by, this engine has 480,000 miles. This little engine does not want to quit, she just wants to run.

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[neanderpaul]

Nice!