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07-08-2007, 01:30 AM | #1 |
What kind of car is that?
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anyone know the benifits of lightweight wheels?
i understand lighter wheels should be less work for the car and maybe pep the car up some but im wondering by how much? is there some kind of formula i can use to determine it?
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07-08-2007, 01:49 AM | #2 |
What kind of car is that?
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sorry wrong thread
but i still need answers lol
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07-08-2007, 02:14 AM | #3 |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
Location: Bangkok, Thailand
Posts: 7,744
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I'm not sure of an actual formula, but search google for the following terms:
Unsprung weight rotational inertia and you'll learn a lot
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07-08-2007, 08:26 AM | #4 |
What kind of car is that?
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good plan :)
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07-10-2007, 08:47 AM | #5 |
Just less total weight. I seen something once talking about gas mileage for every like 100lbs you loose off your car you gain like 3% more fuel effiency. I have seen people toss their spare tire and everything.
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07-10-2007, 12:57 PM | #6 |
That Focus Guy
Drives: 2004 Focus RSVT Join Date: Jul 2007
Location: USA
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Less rotational weight has a larger effect than less total weight. It's the same thing as having a lightweight flywheel: your engine can rev faster because there's less resistance to it spinning. It doesn't increase horsepower or torque (except to the ground), but it does increase acceleration.
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07-10-2007, 01:41 PM | #7 |
Super Moderator
Drives: 2014 White VITZ Join Date: May 2007
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I find it hard to believe that reducing rotational weight by just a few pounds per corner will make any significant difference in fuel savings or acceleration.
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07-10-2007, 01:47 PM | #8 |
That Focus Guy
Drives: 2004 Focus RSVT Join Date: Jul 2007
Location: USA
Posts: 51
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Welcome to physics 101. o.O
And "significant" is subjective. On a car that makes less than 100hp, dropping 5 pounds off of each wheel is going to make difference enough that you'll notice it. |
07-10-2007, 01:59 PM | #9 |
Drives: 07 Join Date: May 2007
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True story.
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07-10-2007, 02:10 PM | #10 |
Lonesome Cowboy
Drives: 2007 WHITE HATCHBACK Join Date: Feb 2007
Location: Inner City, Dallas
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unsprung weight matters, the less the better
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07-10-2007, 02:17 PM | #11 |
That Focus Guy
Drives: 2004 Focus RSVT Join Date: Jul 2007
Location: USA
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Lower unsprung weight is a result of lightweight wheels, as well, and will improve suspension response.
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07-10-2007, 02:20 PM | #12 | |
Super Moderator
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Quote:
Certainly less rotational weight makes some difference... "Welcome to physiscs 101"... but the question is whether a few pounds per corner will make any significant difference in gas consumption and acceleration. |
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07-10-2007, 02:31 PM | #13 | |
Lonesome Cowboy
Drives: 2007 WHITE HATCHBACK Join Date: Feb 2007
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Quote:
I think I'm just agreeing with you here
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07-10-2007, 03:12 PM | #14 |
Drives: 2007 Yaris HB Join Date: Apr 2007
Location: my own little world
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My question would be, is there any disadvantage to lightweight wheels?
I bought mine based on design, but was pleased to find out they weigh just 11.8 lbs apiece! Then I read something that said wheels can be too light...something about reduced traction...which just confused the hell out of me... |
07-10-2007, 03:20 PM | #15 | |
Lonesome Cowboy
Drives: 2007 WHITE HATCHBACK Join Date: Feb 2007
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Quote:
I doubt anything we could get are hands on in a 14 inch or more wheel size would be too light with a tire on it. I've never heard it put that way. I have heard about braking problems with oversized wheels. I think the lighter the better but then strength maybe an issue
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07-10-2007, 03:47 PM | #16 | |
That Focus Guy
Drives: 2004 Focus RSVT Join Date: Jul 2007
Location: USA
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Quote:
If you drive the car to work a few times a week and have plenty of money for gas, it is far less significant than someone else who is on a road or auto-x course looking to shave off tenths of a second. This is called subjective. English 101? I'm just busting your balls, don't take it personally; I don't even know you. I think we're on the same page... you're talking about daily driving and I'm talking about racing. You're not going to notice like a 20% improvement in gas mileage or something crazy, but you'll definitely notice better course times. |
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07-10-2007, 03:59 PM | #17 | |
Drives: Yaris 3 Door, 04 WRX, 69 Lotus Join Date: Apr 2007
Location: norcal
Posts: 128
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Quote:
If you ever look at Kodiak wheels, they are made for racing only. They aren't built to withstand the rigours of daily driving with pot holes and road debris. Driving with race wheels on the street is asking for a cracked wheel... But we're talking about <10lb 14" wheels... |
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07-10-2007, 04:14 PM | #18 |
Drives: 2007 Yaris HB Join Date: Apr 2007
Location: my own little world
Posts: 1,256
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Ok so...
less rotating mass = reduced inertia = faster accel/deceleration? lower unsprung weight = less up-down+side-to-side motion = better grip? |
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