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07-27-2012, 04:42 PM | #111 |
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The newer BMW M cars like the 1M, M5, X5M and X6M have a pretty good torque to horsepower ratio and offer very good performance. The new M3 will probably be comparable and likely outperform the previous M3.
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07-27-2012, 07:16 PM | #112 | |
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Yes absolutely (for rotating engines). Then to extrapolate you can know the performance of any given vehicle with said engine by knowing either the torque curve + gearing or simply by knowing peak hp. You get a darn good estimate with peak hp alone but of course knowing the full hp curve is better.
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07-27-2012, 07:19 PM | #113 | |
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E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK | | Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors | | Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels | | XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit | |
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07-28-2012, 07:59 AM | #114 | |
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07-28-2012, 12:27 PM | #115 | |
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I believe there are quite a few transmissions out there that connect the input shaft directly to the output shaft for the 1:1 ratio, therefore letting the layshaft spin the gears without any power transmitted through them. However I agree, there are plenty of other transmissions that use gears for the 1:1 ratio. I do not know how the M3 6MT is laid out... Even in a transmission that has a direct drive 1:1 ratio, I agree that the 1:1 ratio might not be the most efficient overall, as the faster you spin the drivetrain, the more losses you will have, thus partially or totally negating the benefit of the 1:1 ratio. Every gearbox/drivetrain setup is different. Last edited by CanAutM3; 07-28-2012 at 12:48 PM.. |
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07-29-2012, 10:27 PM | #116 | ||
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07-30-2012, 11:47 PM | #117 | |
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Best question asked so far. If BMW used 4:10 in this setup, then....... |
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07-31-2012, 09:47 PM | #119 | ||
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In this example, for gears 1,2 and 3 the power is transmitted from the input shaft to the lay shaft through the set of fixed pinion gears (left most gears in the illustration); then from the lay shaft to the output shaft through the selected gears. The gears are free to spin on the output shaft unless they are connected to it by the dog collar when a gear is selected. In fourth gear, the dog collar directly connects the input shaft to the output shaft. The fixed pinion gears will still spin the lay shaft and all the other gears, but since none of the other gears are connected to the output shaft, no power is transmitted through the them. In reverse, the power is routed through an additional idler gear to reverse the rotation. Typically a 3 shaft design is used on RWD cars to keep the input and output shafts on the same axis, while FWD may use a 2 shaft design. Last edited by CanAutM3; 09-14-2012 at 07:02 AM.. |
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