Any MPG up mods? Who gets the highest MPG? - Page 2 - Toyota Prius Forum : Prius Online Toyota Forums
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post #11 of 44 (permalink) Old 03-22-2006, 09:26 PM
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Well for winter, I put in an engine block heater. I get about 6 mpg increase, plus slightly faster cabin heat up. Haven't tried it as it gets warmer. Might be interesting.

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post #12 of 44 (permalink) Old 03-25-2006, 03:22 AM Thread Starter
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Does anyone make Cold air inakes or headers, trottle body spacers? anything of that nature? i remember i got about 2-3 mpg off my work truck when i did that kind of stuff.
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post #13 of 44 (permalink) Old 03-25-2006, 04:36 PM
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Hobbit did some experimenting with pre-warming the intake. His coclusions were that it didn't help much.

http://techno-fandom.org/~hobbit/cars/warmair/
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post #14 of 44 (permalink) Old 03-26-2006, 01:31 AM
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heh. Project TL, should've known engine mods would be in order


Anyway, yeah

- block heater
- warm front or some sort of wind breaker behind the grille. Just make sure to monitor the temperature so that you don't overheat
- lose the spare tyre?
- heck, strip the whole trunk of the bins and stuff
- switch seats?
learn how to drive a hybrid properly
- don't make short trips
- minimise A/C or heat use

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post #15 of 44 (permalink) Old 03-26-2006, 02:23 AM
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Quote:
Originally Posted by DanMan32
Hobbit did some experimenting with pre-warming the intake. His coclusions were that it didn't help much.
Our experiment shows about 5% better mileage at 35C than 15C, therefore the warm intake air mod works well.

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post #16 of 44 (permalink) Old 03-26-2006, 12:13 PM
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My only thought would be that a company that works as hard at acheiving a goal as Toyota has done with the Prius (wind tunnel testing the body design, fabricating the hood and trunk hatch of light metals, designing plastic covers for the attractive cast wheels to eliminate drag, supplying a coolant reservoir to keep engine coolant warm ect, ect would not have added an air heating element for the engine if it was in any way "worth it." The principal is not rocket science.



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post #17 of 44 (permalink) Old 03-26-2006, 01:38 PM
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Quote:
Originally Posted by hyperion
My only thought would be that a company that works as hard at acheiving a goal as Toyota has done with the Prius (wind tunnel testing the body design, fabricating the hood and trunk hatch of light metals, designing plastic covers for the attractive cast wheels to eliminate drag, supplying a coolant reservoir to keep engine coolant warm ect, ect
I agree.
Quote:
would not have added an air heating element for the engine if it was in any way "worth it."
The EPA test is done under 68-86 ºF.
http://www.fueleconomy.org/feg/fe_test_schedules.shtml

A company need not care about intake air temp under such test environment.
However, in the real world, a mileage enthusiast cares.
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The principal is not rocket science.
The principal is "Laws of Boyle and Charles".

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post #18 of 44 (permalink) Old 03-26-2006, 03:04 PM
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Yes, ... but,..... I believe Toyota was going for the highest milage figures possible for advertising purposes along with the lowest emissions for the same reason. Usually when you change one componant in a computers reading something else is automatically changed.
I'm sure you will find the heating of the air intake being used in most all other Toyota models with standard cycle engines just as it is used normally in my 82 Chevy pick-up.



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post #19 of 44 (permalink) Old 03-30-2006, 12:18 AM Thread Starter
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thats pretty interesting because usually people go for colder air so you increase the hp, then you dont have to put in as much gas to get the same hp, thus less gas usage. does this not apply to hybrids? I know for sure it works on my work trucks. i have cold air intakes on all of them. but then again. they are poorly engineered.
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post #20 of 44 (permalink) Old 03-30-2006, 02:54 AM
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Quote:
Originally Posted by project_Tl
thats pretty interesting because usually people go for colder air so you increase the hp, then you dont have to put in as much gas to get the same hp, thus less gas usage. does this not apply to hybrids?
colder air -> increase the hp -> increase fuel usage -> lower mileage
A power is not free.

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