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02-23-2007, 12:48 PM | #19 |
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OEM Toyota Pulley - 50.00 oz
ZPI pulley - 14.4 oz NST pulley - 12.5 oz The DIY has been edited to include this information. Thanks for your PATIENCE. |
02-23-2007, 02:34 PM | #20 |
Super Moderator
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'bout damn time.
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02-23-2007, 02:37 PM | #21 |
Who said Yaris was slow?
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75% reduction
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02-27-2007, 09:29 PM | #22 | |
Drives: 2007 Yaris Hatch Join Date: Feb 2007
Location: Chicago
Posts: 346
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Quote:
quick question that "shitty" stock pulley has a rubber material towards the inside right ? |
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02-28-2007, 10:47 AM | #23 |
Drives: Scion FRS Join Date: Aug 2006
Location: Arizona
Posts: 179
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i smell harmonic balance thread whatever coming around .___.
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02-28-2007, 01:49 PM | #24 |
Drives: 03 Toyota Corolla S modded, Join Date: Jan 2007
Location: LAS VEGAS, NV
Posts: 221
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can it improve fuel economy?
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02-28-2007, 06:06 PM | #25 |
Any weight removed from the vehicle improves MPG. Simple fact.
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03-01-2007, 12:20 AM | #26 |
Banned
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03-01-2007, 06:26 PM | #27 |
Though I do agree with you that less weight is better for MPG, when were talking rotating mass, this is not true.
A crude explanation: as you start to decrease rotating mass by lightening things like the pulleys and the flywheel, MPG may suffer. The engine revs faster and once spun up it takes more gas to keep things going. Lower mass will take less time to dissapate the energy put into it. Toyota knows this and has designed certain portions of the drivetrain to take advantage of rotating mass for optimal mpg. The pullys are one of these portions. Gains or losses in mpg will be most noticeable on the highway. Around-town should remain the same or maybe get better. Maybe. The main reason for a possible decrease on the highway is that the RPM at which the engine wants to 'cruise' will likely be eliminated. This is due to a less efficient energy storage system. Anyway, wtf do I know. With only the pulley changed out and the flywheel the same, there likely wont be much change. |
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03-01-2007, 06:30 PM | #28 |
Hey Chino... how is the idle? Notice any difference or have to make any adjustments?
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03-01-2007, 09:11 PM | #29 | |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
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Quote:
BUT! In order to get the rotation up to speed, there is more inertia to be overcome (think of how much effort you spend spinning a small, light top vs spinning a larger heavy one), which is where more fuel is required. So, in this kind of stop-and-go traffic situation, less rotational mass can have a good effect on performance and mileage. Of course, the disadvantage of removing rotational mass in a 4-cylinder daily driver is the idle quality. The engine needs the heavy weight of the flywheel to keep it going during the 3 non-power strokes. So, when you reduce this mass, the engine will slow down between rotations, and at a lower engine speed (idling), this can make things very rough, even stall the engine. But, as I mentioned before, 80% (if not more) of the rotational mass in our engine/transmission would be from the flywheel, so a ligher crank pulley should not be such a big difference that it can cause problems. At least that's what my physics education tells me, I can't wait to see the effects for myself
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03-01-2007, 09:18 PM | #30 |
I think you explained it better. but I tried...
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03-01-2007, 10:00 PM | #31 |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
Location: Bangkok, Thailand
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A for effort
ah this "education" had to come in useful sometime.. I used to love physics, best in my class... but that was many many moons ago
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The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ... |
03-01-2007, 10:56 PM | #32 |
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03-01-2007, 11:06 PM | #33 |
Good to know. Now where's my damn pully!!!
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03-01-2007, 11:14 PM | #34 |
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I just got word pulleys should ship out mid next week. Let the crying begin!
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03-28-2007, 03:10 PM | #35 |
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Drives: 07 Toyota Yaris, 71 Galaxie Join Date: Mar 2007
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I have mine installed. Love it! Thank you Chino Charles!
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03-28-2007, 08:41 PM | #36 |
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Astroman, can you feel the difference in rev speed? Engine idle? What is your take on it?
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