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Old 10-28-2009, 11:43 PM   #1
basslover911
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Question MPG Tune --- Fuel Economy only ??

Which tuner would be the best? Or is stock as good as it gets since its already made for fuel economy?

I would like to add some timing and lean it out a bit (I never drive full throttle) ... ?

And as a side Q, do all "chips" or "tuners" have to be plugged in all the time for them to work?


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Old 10-29-2009, 01:42 AM   #2
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its called a "green tune" i learned about it in super street class in uti. we used the sct softwear to write our own tunes after a base dyno run with an afr meter. you adjust the blocks so that its always around stoich and put in your tune. they also taught us a "hybrid tune" that its a green tune down low till whatever rpm you want, then normal or whatever you want really after that rpm. (disclaimer: if someone has anything to say on the contrary im open to learn more and research, but this is what i was taught)
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Old 10-29-2009, 04:51 AM   #3
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Unfortunately.....there is no hard evidence that anybody has developed an "economy tune" for the Focus. You'll find a few claims....that's about it.

Those "tunes" are so expensive, they would have to give at least a 3mpg saving to pay for themselves in 3-4 years.And that's if gas went back to $4gal, and you were driving 15K+ a year. (estimates)

If anybody finds evidence to the contrary, I'd like to se it. I already bought my 100mpg vehicle......for about the price of a "tune".

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Old 10-29-2009, 05:09 AM   #4
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well we made them in class, but never put them into a vehicle. the only one we put into a lightning was a dyno tune or WOT tune. we did pretty well for our first time. (groups of 3) i still have all the material from the class somewhere.
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Old 10-29-2009, 08:44 AM   #5
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What most people dont realize is that up to 400 counts on the TPS you are already tuned for stoich from the factory (all the way up to redline) and thats where you do over 95% of your driving.

Green tunes are a joke, when you start running at stoich at all rpms you start getting ino very dangerous waters, since in the upper rpms you need to go rich to curb detonation and reduce exhaust temps.
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Old 10-29-2009, 09:30 AM   #6
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I've seen the chips on ebay, but I didn't put too much stock in them.
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Old 10-29-2009, 10:46 AM   #7
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Many say my tunes add MPG but to buy a tune just for better MPG is like stated going to take a good bit to pay for it

When driving in idle , cruise , part throttle you are in closed loop and the ECU is controling the fuel with closed loop meaning that even if you did lean it out the ECU would correct what you did and put the AF right back where it was

If you want better MPG , things like tire psi , driving style , new plugs and air filter , AC use when in the throttle etc , I have tought many on how to better drive and most gain about 1.5 to 2 miles gal just from that

I get 26 in town from a car rated at 21 , when I drive normal I get 20 to 21 , driving style has a lot to do with your MPG

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Old 10-29-2009, 11:00 AM   #8
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Well I am a hypermiller. I've had the most mpg Mazda 6 that anyone has had, got 46mpg at 65mph. From a 2.3l mtx. It was modified of course

thats the course im going with my new focus, max mpg. I will be doing moon discs, kammback, wheel deflectors, you know the works.

Even though i am very experienced with aerodynamics, i havr no idea with engine parameters. I realize its always running closed loop (with my way of driving), but can none of the tunes change the ratio from 14.7 to 16.1 or something like that? Is there no way to change that fixed ratio that the car is always trying to go to while in closed loop??

Btw you can also find me in gassavers and ecomodder forums :D
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Old 10-29-2009, 11:04 AM   #9
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And I haven't gone through one tank of gas so I can't tell you what mpgs I'm getting right now but Ive driven 70miles or so (city/highway 50/50) and the needle has gone down a little less than 1/8.

I haven't gotten a chance to put the scangauge In my car either, plus it has to be calibrated so it wouldn't read what I have done so far anyways.
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Old 10-29-2009, 12:11 PM   #10
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The gas gauge is very inaccurate. Don't use it for any MPG calculations. The odometer is accurate. You know how many miles you've driven, and how much gas you used. A little division.....you'll be able to figure your MPGs.

FWIW......I usually go about 100miles by the 3/4 mark on the gauge. The last 1/4 of the tank on the gauge.......I barely get 50 miles.
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