Any MPG up mods? Who gets the highest MPG? - Page 3 - Toyota Prius Forum : Prius Online Toyota Forums
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post #21 of 44 (permalink) Old 03-30-2006, 02:57 AM Thread Starter
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i follow you to increased hp, but when you increse hp, you dont need to push down as hard on the pedal to get the same movement. I have experienced milage gains on my trucks and passanger cars with the instalation of cold air intakes.
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post #22 of 44 (permalink) Old 03-30-2006, 04:23 AM
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Our experiment shows the best mileage was achieved at 35C intake air temp.

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post #23 of 44 (permalink) Old 03-30-2006, 08:18 AM
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Air that is too cold causes problems in keeping the fuel vaporized, thus reducing efficiency.
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post #24 of 44 (permalink) Old 03-30-2006, 09:37 AM
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Convert that 35C to "F" and that is pretty darn warm. Check out those cold air ducts on your trucks. You just might find a piece of plastic ducting coming from a "muff" surrounding an exhaust header pipe attached to the cold air duct and supplying it with solinoid conrolled heat.
Now, check out under the hood of the Prius and you will see that there is in no way any room there for this type of modification, and none is visable that I could find.



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post #25 of 44 (permalink) Old 03-30-2006, 02:07 PM
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Correct, the Prius does not have an air intake pre-heater. Hobbit tried making one though http://techno-fandom.org/~hobbit/cars/warmair/ and found no improvement.
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post #26 of 44 (permalink) Old 03-30-2006, 07:08 PM
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Quote:
Originally Posted by DanMan32
Correct, the Prius does not have an air intake pre-heater. Hobbit tried making one though http://techno-fandom.org/~hobbit/cars/warmair/ and found no improvement.
His experiment was doubtful.
http://autos.groups.yahoo.com/group/Pri ... sage/15686

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post #27 of 44 (permalink) Old 04-04-2006, 02:25 PM
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Default Improved mileage by charging battery

I just got my new 2006, although I have driven several Prius models (2003, 2005).

I notice that the engine runs to warm up when first started but then it also runs after that, even when I'm not accelerating. It seems that its bringing the main battery up to a greater state of charge (I understand that the computer likes to keep the NiMH at 80-20% charge, with 80-40% looking like its preferred range). I also notice the energy display shows less charge in the morning than when I put my Prius in the garage at night.

I also notice that the first 5 minutes of a trip is the worst mileage- 25-30MPG is the best I've done. Get 50-80MPG after that.

I also read about the guys in CA who added a huge Li-Ion battery pack and got nearly 200MPG in 30 to 60 mile daily trips.

So... What if I was able to charge the NiMH battery pack at night. Would I get better mileage (for the first 5 minutes of driving at least).
Has anyone done this? Can you charge the 12V battery thru the power outlet (cigarette lighter) and have the Prius upconvert the 12V to the Main battery pack voltage (seems unlikely)?

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post #28 of 44 (permalink) Old 04-04-2006, 03:02 PM
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I doubt you can avoid the warmup during the first 5 minutes of driving, without using an EV switch. Even then, you are just delaying it until later.

Now, if you can get onto a highway under EV and hit 65MPH during your warmup, you might see better MPGs. Good luck on that...

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post #29 of 44 (permalink) Old 04-04-2006, 08:22 PM
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Default Re: Improved mileage by charging battery

Quote:
Originally Posted by jharris9
I notice that the engine runs to warm up when first started but then it also runs after that, even when I'm not accelerating.
Are you familiar with warming up stages?
http://priuschat.com/forums/kb.php?mode=article&k=14
Quote:
It seems that its bringing the main battery up to a greater state of charge (I understand that the computer likes to keep the NiMH at 80-20% charge, with 80-40% looking like its preferred range).
The SOC of NiMH is controlled 40%-80% and preferred 45%-65%.
http://privatenrg.com/#Full_SOC
Quote:
So... What if I was able to charge the NiMH battery pack at night. Would I get better mileage (for the first 5 minutes of driving at least).
Has anyone done this?
Little benefit with huge expense.
AFAIK, no one did.
Quote:
Can you charge the 12V battery thru the power outlet (cigarette lighter) and have the Prius upconvert the 12V to the Main battery pack voltage (seems unlikely)?
The cigarette lighter line is disconnected when Prius is OFF.
There is no such upconverter in Prius.

The engine block heater will help you to improve the first 5min mileage.

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post #30 of 44 (permalink) Old 04-05-2006, 01:42 PM
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Default Larger circumfrance tires

When replacing the tires if available a 185/75-15 should increase the MPG.

Just simple logic; please explain why it won't work if I am missing something.
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