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01-27-2014, 12:34 AM | #23 |
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Great insight, thanks for posting. Of course, the real issue will be testing cars at dealers, and then navigating the crazy dealer mark ups to actually own one. I am hoping that the frenzy starts to diminish next year, and I can negotiate a reasonable price for ED.
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01-27-2014, 12:43 AM | #25 | |
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01-27-2014, 01:13 AM | #26 |
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01-27-2014, 01:38 AM | #27 |
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We are talking here a 4 second 0-60 performance, this is Porsche, Ferrari and other "2 seat" exotic car territory.
Will this 4 seat chassis be durable and stable in a long term in combination with the engine, it all sounds like the engine will be faster than chassis, let's wait and see after some time how will this unfold. As many are saying let's hope there will be no issues. At the moment it all appears to me that this race is all about numbers on paper. |
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01-27-2014, 08:44 AM | #28 | |
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01-27-2014, 08:47 AM | #29 | |
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01-27-2014, 09:35 AM | #30 | |
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01-27-2014, 09:45 AM | #31 |
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This sounds great and I can't wait (like everyone else) to get in this car and drive it. I saw it in DC this weekend in person and loved it!
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01-27-2014, 09:50 AM | #32 | |
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A car like the Ferrari F12 (front engine RWD) has a weight distribution of 46/54, and is regarded as a good handling car... Ferrari F12 is 46/54 Ferrari FF is 47/53 Ferrari California is 47/53 Merc SLS AMG is 53/47 Aston Martin DBS is 51,3/48,7 BMW F10 M5 is 52,5/47,5 All of the above are front engined cars with RWD and are considered good handling cars. None is at 50/50, but Ferrari are rear biased and the others are front biased. And as far as I know, a race car like the Audi R18 TDI Le Mans Prototype runs a even weight distribution front and rear. The R8 etron has a 48/52 distribution ( http://www.worldcarfans.com/11006142...urs-of-le-mans ) Last edited by Boss330; 01-27-2014 at 02:35 PM.. |
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01-27-2014, 01:24 PM | #33 |
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01-27-2014, 01:29 PM | #34 |
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With the N54 getting over 700 whp on stock internals, this motor should be amazing. It would be a disappointment if it wasn't.
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01-27-2014, 01:31 PM | #35 |
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I am really not sure of what advantage is gained from a 50/50 weight, after factoring suspension into the equation. I suppose your car balance will be easier to predict initially at a track particularly during minor weight transfers. But it's nothing you wouldn't just adapt to if it weren't perfectly split.
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01-27-2014, 01:41 PM | #38 |
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01-27-2014, 02:17 PM | #39 | ||
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50/50 distributions and slight nose-heavy distributions are supposed to be a contributing factor towards more accessible handling in RWD applications, if I recall correctly.
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01-27-2014, 02:22 PM | #40 | ||
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A car, as it travels through a bend, also needs to pivot on itself to keep the proper heading. The car does not pivot around its CG nor does it pivot around its "middle". The car pivots around the mid point between the two rear wheels (assuming zero slip angles). Imagine the front wheels steered at 90deg and this becomes very obvious. To calculate the moment of inertia of an object pivoting around a point, the natural moment of inertia of the object needs to be added to the mass of the object times the square of the distance of its CG relative to the pivot point. So the closer the CG is to the rear axle, the easier it is to pivot a vehicle. Hence the benefit of a rear weight bias. The counter point is that when the rear tires start to slip more than the fronts (oversteer), the pivot point progressively moves away from the rear axle towards the front axle. So once you loose the back end on a rear weight biased car, it becomes much more difficult to bring it back. Last edited by CanAutM3; 01-27-2014 at 02:45 PM.. |
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01-27-2014, 02:22 PM | #41 | |
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Porsche's are extremely rear weight biased with the engine hanging back behind the rear axle. If you're trail braking too hard you will feel the 911's weight wanting to come around on you and get out of line a bit. It's just one reason why the rear tires are so wide. This is also the reason for the 'never lift' saying that many Porsche owners pride themselves in when you are mid corner starting to drive out. 911's are great cars but they can be tricky and demand respect for that weight in the rear. If they would put some of the higher output engines in the Cayman you would have a much better balanced car but Porsche is plagued with it's history. In the way BMW builds their cars with the ideal 50/50 in mind they are much more approachable than the 911 and more rewarding than Audi's. 50/50 weight maintains inertia equally on both ends of the car and is ideal for handling overall. Someone had posted concerns about the chassis not being capable of harnessing the power of the new engine. Given BMW's history, the chassis has always been the priority. It is why they are known for great handling. The new M3/4 are not going to be like GT500's.
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01-27-2014, 02:25 PM | #42 | |
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I thought 40-60 weight distribution in a RWD car is better. |
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01-27-2014, 02:32 PM | #43 |
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Can't wait!!
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