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Old 01-10-2009, 04:34 AM   #1 (permalink)
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2003 toyota camry baby blue and not a scratch.

We just bought this cherry sedan for comfort, I have a very bad back, and for cost savings.

I have driven at max recommended pressure (44psi) for my tires. I use cruise at appx. 7-10 mi off the speed limit. I always use manual throttle control on steep grades. Here in the Sierra foothills cruise entails a lot of program driven down shifts. When I drive controlling the pedal I have far fewer downshifts.

Now to my query: Is there anyone out there who is modding the shift points on their auto transmissions. It seems that with lower shift speeds and careful throttle control that it should be possible to save. This should be especially true in commute ssituations. Which, thank God I no longer have to do except to get medical care in the Big City.

So, now I'm on a flight of fancy: If shift points produce improvements why not other adjustments to the spark timing, fuel mixtures etc that can be done by reprogramming the engine control computer. I'm in the dark. The last thing I tried modding was the Mellenium Falcon and I was never able to get Hans to give me readouts on his fuel performance.

What about larger tires= more miles per revolution. But what about speedo gears so the mph is right (close)?

Any help, in general, but especially related to my four cylinder Camry would be greatly apprecciated. Someone out there must know what the manufacturers programmed into these cars. They also must be able to find out where the comfort/performance/ease of driving compromizes were made.

OK, with all that said it is off to bed to dream 50 mpg dreams in my new ride.



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Old 01-11-2009, 10:23 AM   #2 (permalink)
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Welcome to EM weatherguy. Toyota does quite well to optimize engine programming with respect to mileage with good emissions. The shift points could definitly be altered for better fuel economy though, regardless of manufacturer.
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Old 01-11-2009, 06:02 PM   #3 (permalink)
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Welcome to ecomodder,

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