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triple clutcher posted:most 'fuel saver' packages add whatever the cheapest wheels are, because poverty spec = MPG somehow. Generally cheaper wheels are smaller in diameter and thus have a lower moment of inertia. Just like how the body/frame/ect needs energy to be accelerated to get up to a translational speed (1/2*mass*velocity^2) the driveline needs energy to accelerate up to an angular speed (1/2*inertiaMoment*angularSpeed^2).
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Jan 24, 2014 00:10
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SanitysEdge posted:Generally cheaper wheels are smaller in diameter and thus have a lower moment of inertia. FWIW, the Fiesta has at least one kind of 15" alloy available too.
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Jan 24, 2014 00:13
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Tires generally weigh less than wheels. That's why your unsprung mass tends to go up when you put on a lower-profile wheel/tire combo, at least for common street wheels.
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Jan 24, 2014 00:22
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I guess it makes sense that if someone is going to be quibbling about a buck or two every time they fill up, they aren't going to want to spend on extravagances like wheels made out of aluminum, or other not-completely-necessary items? But, for some reason, they're buying a new car. I guess that doesn't make sense after all.
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Jan 24, 2014 00:25
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triple clutcher posted:would that still apply if the overall diameter ( wheel and tire ) is the same? Yes, if the average density of the wheel is lower than the average density of the tire. Heres a MIT physics lecture for maximum technicalness
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Jan 24, 2014 00:26
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SanitysEdge posted:Generally cheaper wheels are smaller in diameter and thus have a lower moment of inertia. Feel free to correct me, but wouldn't a larger tire have a greater surface of contact, improving grip at the cost of added friction?
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Jan 24, 2014 00:28
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Contact patch size and shape is determined by weight of vehicle and size of tires. Increasing the width of the tires does not make the contact area bigger but it does change it's shape. But generally speaking stickier or wider tires will add extra friction at the detriment of fuel economy.
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Jan 24, 2014 00:36
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I definitely notice about a 2mpg hit when I switch between my winter and summer wheels & tires. My winters are 215 Blizzaks on 16" wheels, my summers are 225F/245R Michelin Pilot SS on 18" wheels. How much of that is bigger wheels vs bigger tires vs stickier tires I don't know but the combined effect is real. I do definitely drive on the summer tires harder when I can, but the drop is noticeable even just doing the exact same commute in traffic with the same driving manners. But it's worth it.
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Jan 24, 2014 00:52
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surebet posted:Feel free to correct me, but wouldn't a larger tire have a greater surface of contact, improving grip at the cost of added friction? Trying to piece together the analysis that complicated is making my head spin. If your trying to ask if the added contact friction offsets the smaller wheel in terms of an MPG improvement then I guess you could compare power consumed by the frictional force and power to push the wheel up to angular speed. For a tire the mathematical analysis of the frictional force is so complicated your better off running experiments with real tires to find whatever it is. The angular power computation is trivial in comparison. Off the top of my head my best answer to this question is "I dont know".
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Jan 24, 2014 00:54
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surebet posted:Feel free to correct me, but wouldn't a larger tire have a greater surface of contact, improving grip at the cost of added friction? With every other factor equal, a wider wheel will have a higher rolling resistance. Different tyres have different rolling resistances as well, depending on the tread pattern, hardness of the rubber, etc. And a wider tyre gives a small but probably completely negligible increase in drag.
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Jan 24, 2014 02:52
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InitialDave posted:Maybe a lot of the other stuff they make, but the Defender remains pretty much an agricultural truck, the majority of additions being things that do let it do Defender type activities better. Yeah, I'm kinda wondering about this too. Talk about the Evoque or even the Range Rover Sport.....or the tarted up LR4/Disco4 (in descending order from what they can do off road....which is still quite impressive).....but the Defender? No. That's still a farm truck that kicks rear end. They may have (did) tart it up, but it's still got the things that count. (and I would murder someone for a new one that is legal in the US)
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Jan 24, 2014 03:28
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Pardon the lo-fi pic, but... Yes, I live in Florida. No we don't have inspections of any kind. And yes, the entire passenger side was pushed in so far that when viewed from behind the three pillars formed a huge V. All the other usual stuff was screwed up as well; that is, lights, windshield, alignment, tire pressure, suspension, etc. 11BulletCatcher fucked around with this message at 06:20 on Jan 24, 2014 |
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Jan 24, 2014 04:01
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Looks like Australia...
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Jan 24, 2014 05:07
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Guinness posted:I definitely notice about a 2mpg hit when I switch between my winter and summer wheels & tires. If this applies to your area, 'winter' gas blends will cost you 5-10% efficiency as well, so depending on the timing of your tire changes you may be getting double whammied.
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Jan 24, 2014 05:21
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Dakotaboy88 posted:My cousin just sent me this gem he saw in his condo parking lot. No one noticed how goddamn bald and irregularly worn that tyre is?!
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Jan 24, 2014 05:59
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Chinatown posted:Runnin' slicks I see. Very nice. Preoptopus posted:No one noticed how goddamn bald and irregularly worn that tyre is?!
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Jan 24, 2014 06:17
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Motronic posted:Yeah, I'm kinda wondering about this too. Talk about the Evoque or even the Range Rover Sport.....or the tarted up LR4/Disco4 (in descending order from what they can do off road....which is still quite impressive).....but the Defender? No. That's still a farm truck that kicks rear end. They may have (did) tart it up, but it's still got the things that count. I didn't hear about this before you got me thinking about Defenders, but now I am saddened by this terrible car stuff: quote:In Oct 2013 Land Rover announced that production would end in Dec 2015, after a continuous run of 67 years. We should keep making old things. 
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Jan 24, 2014 06:29
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I doth believe that the shoes of sirs conveyance have become quite weathered.
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Jan 24, 2014 06:29
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Rhyno posted:I doth believe that the shoes of sirs conveyance have become quite weathered.
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Jan 24, 2014 06:33
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Slavvy posted:How 'bout you leave English alone. Tell it to stay on it's side. It keeps touching me!
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Jan 24, 2014 07:01
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Preoptopus posted:No one noticed how goddamn bald and irregularly worn that tyre is?! I thought we agreed he was bending his lower spring cup so it wouldn't rub the tire.
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Jan 24, 2014 08:43
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drukqs posted:drat the expense. I would do that without even thinking. The CR-Z is not exactly a great gas mileage vehicle. It's rated at 31/37 mpg for the US, which is pretty crappy for a 2-seater hybrid. Doesn't the Camry hybrid get better mileage than that?
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Jan 24, 2014 15:31
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Guinness posted:I definitely notice about a 2mpg hit when I switch between my winter and summer wheels & tires. My winters are 215 Blizzaks on 16" wheels, my summers are 225F/245R Michelin Pilot SS on 18" wheels. How much of that is bigger wheels vs bigger tires vs stickier tires I don't know but the combined effect is real. Oddly enough, my winter setup seems to see better mileage than my summers, even with the lovely fuel we get in winter. But my summers are 235/35/19 vs 195/65/15 for winter. I'm assuming it's because they're drat near half the weight of the summers.
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Jan 24, 2014 15:42
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Rhyno posted:Tell it to stay on it's side. It keeps touching me!
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Jan 24, 2014 18:35
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Nocheez posted:The CR-Z is not exactly a great gas mileage vehicle. It's rated at 31/37 mpg for the US, which is pretty crappy for a 2-seater hybrid. Doesn't the Camry hybrid get better mileage than that? Hell, my TDI Jetta sportswagen gets better than that with the auto.
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Jan 24, 2014 19:00
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veedubfreak posted:Oddly enough, my winter setup seems to see better mileage than my summers, even with the lovely fuel we get in winter. But my summers are 235/35/19 vs 195/65/15 for winter. I'm assuming it's because they're drat near half the weight of the summers. That's what I was implying, my winters get better gas mileage than my summers. They're smaller, narrower tires on smaller wheels.
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Jan 24, 2014 19:48
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Is the radius the same? If your other tyres are smaller it'll clock more miles for the same distance, and perhaps look like you're getting a slight mpg bump. Wouldn't be enough to account for a worthwhile increase, but it could see you "gaining" a dozen or so miles to a tank. I agree it's more likely the combination of lighter wheels/tyres and somewhat enforced gentler driving.
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Jan 24, 2014 20:08
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Tekne posted:Listen to the M4 sing.
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Jan 24, 2014 20:46
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Nocheez posted:The CR-Z is not exactly a great gas mileage vehicle. It's rated at 31/37 mpg for the US, which is pretty crappy for a 2-seater hybrid. Doesn't the Camry hybrid get better mileage than that? The bigger and more useful Fiesta 3cyl does better than that on both city and highway, without the weight, expense, and complexity of a hybrid drivetrain and battery. The CR-Z's mileage is downright terrible for a Prius-sized hybrid.
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Jan 24, 2014 20:53
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IOwnCalculus posted:The bigger and more useful Fiesta 3cyl does better than that on both city and highway, without the weight, expense, and complexity of a hybrid drivetrain and battery. The CR-Z's mileage is downright terrible for a Prius-sized hybrid. It's because it's a fit motor with a tiny electric starter attached. It's almost not a real hybrid. It can't power itself on electricity alone, it's just to 'assist' the gas motor.
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Jan 24, 2014 21:00
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I saw this exact same monstrosity in St Pete, Florida heading north on 275 a week or so ago. For scale, I was in my miata and his bumpers were above the roof of my car. Well above. I'm seriously surprised this thing doesn't spend most of it's time on it's side.
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Jan 24, 2014 22:03
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IOwnCalculus posted:The bigger and more useful Fiesta 3cyl does better than that on both city and highway, without the weight, expense, and complexity of a hybrid drivetrain and battery. The CR-Z's mileage is downright terrible for a Prius-sized hybrid. They're not at all the same type of car though - the comparison to the Fit hybrid would be more useful.
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Jan 24, 2014 22:48
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At least these ridiculous trucks have better bumper levels, don't know what you do with them though.  
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Jan 24, 2014 23:04
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They should pipe this sound in for the M4 over the stereo: http://www.synthmania.com/Roland%20MKS-50/Audio/Factory%20examples/A86%20PolePositn.mp3 
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Jan 24, 2014 23:06
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Amphion is posting dick pics again
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Jan 24, 2014 23:08
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For a supertruck they didn't line up the bed too well with the cab. Might need a few superspacers for that supertiny dickmobile.
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Jan 24, 2014 23:14
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buttcrackmenace posted:Amphion is posting dick pics again Seriously, buy one of those and you might as well tattoo "micropenis" on your forehead.
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Jan 24, 2014 23:30
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It would be pretty rad to own if gas was super cheap and there was nobody else on the road/in the parking lot.
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Jan 24, 2014 23:35
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Astonishing Wang posted:It would be pretty rad to own if gas was super cheap and there was nobody else on the road/in the parking lot. Yeah, I would imagine gas mileage is somewhere in the realm of 3 digits of feet per gallon.
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Jan 24, 2014 23:37
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Why doesn't the cab align with the bed?
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Jan 25, 2014 00:22
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