Mercedes C class: Huge Refresh!
12-23-10, 09:38 AM
#46
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Interior is a big improvement though!
12-23-10, 10:43 AM
#47
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new engines for USA:
http://www.roadandtrack.com/auto-sho...-c-class-sedan
A new model is also set to enter the C-Class lineup, with the C250 positioned as the new entry-level model. Powered by a direct-injected 201-bhp twin-turbocharged 4-cylinder engine, the C250 will likely be available with either a 6-speed manual or 7-speed automatic transmission. Mercedes promises that the new C-Class will be more fuel efficient than before, but official EPA mpg figures have not been released. At the moment, the 2011 C-Class sedan with the standard 3.0-liter V-6 averages 18 mpg city/26 mpg highway. The C250 should improve significantly on these figures.
The C300 with Mercedes 4MATIC all-wheel-drive system carries on with a 228-bhp 3.0-liter V-6 engine. However, the C350 also features a new direct-injection engine, a V-6 delivering 302 bhp and 273 lb.-ft. of torque. These range-topping models are likely to be only available with the 7-speed automatic transmission.
The C300 with Mercedes 4MATIC all-wheel-drive system carries on with a 228-bhp 3.0-liter V-6 engine. However, the C350 also features a new direct-injection engine, a V-6 delivering 302 bhp and 273 lb.-ft. of torque. These range-topping models are likely to be only available with the 7-speed automatic transmission.
12-23-10, 10:54 AM
#48
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actually led headlight performance on lsh and rxh are less than that of their hid brothers. i didn't know r8 has led headlights? i thought they have led has drl.
in any case, i am not a big fan of led headlights yet except the cool factor. but as accent light or drl, if designed well, they are pretty nice
in any case, i am not a big fan of led headlights yet except the cool factor. but as accent light or drl, if designed well, they are pretty nice
Yeah R8 has a full LED headlight system. It's standard on the V10, and is an available option on the V8.
12-23-10, 01:31 PM
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12-23-10, 09:04 PM
#56
Your typical 35watt HID bulb produces 3200 lumens - thats over 90 lumens per watt. Most metal halide, CFL, fluorescent lights are about the same - and they are all about 4 times more efficient than halogen. Technically, high quality LED have roughly the same range, but thats just the LED's themselves. In order to have high power LED, they build chains of them, often requiring additional electronic parts - resistors, transistor and whatnot, and they all drain energy. In many cases of high power LEDs, active cooling is required, and that of course requires additional energy.
As far as the size of LED light, yes the LEDs themselves are small, but when you're dealing with LEDs powerful enough for headlights, you need to space individual LEDs away from each other and implement huge heatsinks for head dissipation. It's really a plustercluck thats just not worth it.
Take a look at a 12watt LED 6" downlight fixture. Notice how huge and complex that thing is, and it only produces 650 lumens. A 12w CFL bulb will produce about 800 lumens, without all the complexity.
So like I said, LEDs are good for low power indicator/marker/brake lights - because they are tiny bright sources of lights, and because of that they are highly visible. But for application requiring actual usable light output, LEDs are useless.
12-23-10, 10:47 PM
#58
och has hit all the points. when you go to intensive lowbeam output, hid is noticeably more efficient in terms of lumen output, there's been a few study on that. a 600hl owner (who previously owned 460) said the same thing. same experience here when i drove the 600hl compared to my 460l.
