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Old 02-11-2013, 10:37 PM   #1 (permalink)
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Rodney - '00 Plymouth Neon Base
90 day: 33.05 mpg (US)
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EOC switch and Bridgestone B381's= woohoo

I installed a new set of bridgestone B381's and an engine off coasting switch in my car. I previously had the following mods
Removed the A/C and Power steering belt.
Installed a partial grill block.
Installed cruise control sourced from a junkyard.
installed lower valance made of yard edging
Side gapped and indexed plugs
Synthetic fluids in tranny and engine
On my way to work today I averaged 47MPG, which is by far the best FE ever in this vehicle. I am hoping to do better, but need some input.

Will playing with engine coolant temperatue help with FE?
Does fooling the CPU by pulling the O2 sensor out of the exhaust flow stream really help?
How about the IAT sensor with a resistor mod?

Any input will be appreciated.
Ottis

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2000 Neon.
My first attempt at good fuel economy
Have had MANY F-A-S-T gas guzzlers in the past
Goal is 47 MPG

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Old 02-11-2013, 10:54 PM   #2 (permalink)
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HOTTER coolant = better FE, but problematic during HOT summer weather.

COOLER coolant = better HP, but problematic for precise A/F-ratio (open-loop) control.
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Old 02-12-2013, 12:05 AM   #3 (permalink)
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Quote:
Originally Posted by dohcsvt View Post
I installed a new set of bridgestone B381's and an engine off coasting switch in my car. I previously had the following mods
Removed the A/C and Power steering belt.
Installed a partial grill block.
Installed cruise control sourced from a junkyard.
installed lower valance made of yard edging
Side gapped and indexed plugs
Synthetic fluids in tranny and engine
On my way to work today I averaged 47MPG, which is by far the best FE ever in this vehicle. I am hoping to do better, but need some input.

Will playing with engine coolant temperatue help with FE?
Does fooling the CPU by pulling the O2 sensor out of the exhaust flow stream really help?
How about the IAT sensor with a resistor mod?

Any input will be appreciated.
Ottis
This site has some information on a coolant sensor mod, and I seem to remember some other small signal mods.

By pulling the O2 sensor out of the exhaust flow the computer will sense a lean condition, to correct for this it will add fuel. Seeing no change in the O2 values after increasing the fuel in the mixture, it will disregard the O2 sensor, throw a code and revert to running on the map, which is less efficient.
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Old 02-12-2013, 03:35 AM   #4 (permalink)
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clank - '99 jeep tj sport
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if you do anything to the o2 sensor; it will run in limp home mode, which means it'll run off a specific program that is ment to be used to get you to a garage; it will run rich and can cause problems with your cat.

the same can go for resistor mods
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Old 02-12-2013, 10:43 PM   #5 (permalink)
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Quote:
Originally Posted by dohcsvt View Post
On my way to work today I averaged 47MPG, which is by far the best FE ever in this vehicle. I am hoping to do better, but need some input.
You are off to a very good start. I suggest fine tuning the grille block - cover too much, then open up just enough to keep the engine from overheating. Tire pressures to max sidewall. Wheel covers. Belly pan if you feel ambitious. Get good with the EOC switch.

Really work the DWB and DWL. When you stop using the cruise control because you get better mileage driving manually, then you are ready to start learning DWL.

But don't waste time trying to redesign the fuel delivery system.

Does your car have the same engine as the base 1995 Neon? If so, that engine could benefit from a camshaft designed for efficiency at lower RPM.

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