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06-03-2013, 02:49 PM | #23 |
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Entertaining read. Thanks for posting.
0-60 in 3.5-3.7 seconds from a RWD with 275 width street tires huh? I know the calculated numbers don't factor loss of traction but I'm guessing that wouldn't be possible without a serious tire upgrade. |
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06-03-2013, 02:50 PM | #24 | |
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FD: 3.15 1: 4.25 2: 2.57 3: 2.03 4: 1.60 5: 1.27 6: 1.00 7: 0.75 I am curious to see the acceleration curve it would generate. I am guessing a very smooth curve (except for the 1-2 shift) with progressively decreasing acceleration as the speed increases. Again here, just wishful thinking on my part . |
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06-03-2013, 02:55 PM | #25 | |
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This is clearly not as fast as a 2011-2012 GT-R. I've seen low 11s reported for that car. It's all about power and weight. If this car gets 450 hp and has a weight in line with my ESTIMATE. It simply WILL be this fast.
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06-03-2013, 02:57 PM | #26 | |
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06-03-2013, 03:02 PM | #27 | |
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There are no excuses . Google spreadsheets are free, recall that this is always exactly true: HP = torque x rpm / 5252
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06-03-2013, 03:04 PM | #28 |
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The simulation fully account for wheelspin, at launch and at shifts. Check out the flat parts of the acceleration vs. time plots. It also accounts for a spinning tire having less friction than a gripping one. Like I mentioned above, cars just keep getting faster and the existing M3 has already done a 3.9 0-60! My range is justified, reasonable and likely.
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06-03-2013, 03:11 PM | #29 |
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Awesome post. 3.6-7 0-60 would be really nice and your quarter mile figures make sense when compared to other cars. Do you have any idea what the mpg will be like for the M3/M4 if shifting gears in low RPMs? and do you buy the rumors that the new engine will have 3 turbos?
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06-03-2013, 03:16 PM | #31 | |
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Here are the actual acceleration profiles. Almost identical except in 1st gear. Here is the summary of numbers. No practical change in 1/4 mi time nor trap. Surprised? I'm not. This is very much like the final drive mod debate! Did you follow one or more of those?...
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06-03-2013, 03:19 PM | #32 |
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Good read. Fingers crossed fantasy becomes fact!
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06-03-2013, 03:36 PM | #35 |
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Fun read!
Thanks for sharing your thoughts.
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06-03-2013, 03:44 PM | #36 |
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So true. I have a C63 and traction is major issue off the line. That's why the new E63 AMG will be 4-wheel drive. I cannot imagine that you can get below 4 seconds to 60 without a LSD; huge tires and a big rear weight bias in a RWD car.
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06-03-2013, 03:57 PM | #37 | |
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E30M3:190-230hp E36M3: 286-321hp E46M3: 343hp E92M3: 420hp The E36 and E46 had about the same hp, but the latter was faster and better. My guess is that the power will be pretty much like what we saw in E92M3, about 420-430, official that is. We all know BMW are pretty modest, so 450 is likely in the ballpark. But then again, we will see a significant bump in torch, so it will be easier and more of a daily driver with the low end torch, and faster than the excisting M3.
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06-03-2013, 04:34 PM | #38 |
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Well, I was hoping it would be 450, but all recent reports indicate no HP increase, but significant weight loss (targeting E46M3).
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06-03-2013, 04:54 PM | #40 |
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I think the final BMW official # for 0-60 is more like a 3.8-4.2 second car. Can't really see how it can be under 3.7s without serious tire upgrade.
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06-03-2013, 05:09 PM | #41 | ||
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If we assume DCT, why the interruption in acceleration on gear shifts? Also, why so much wheel spin and lost acceleration going into 2nd? If the car was able to pull 1g in first gear without losing traction, there is no reason it cannot pull 0.75g in second gear. I am guessing that we don't see benefits of the gearing due to assumed shift times and tire slippage shifting into 2nd... Let me explain why I selected those gear ratios. I reduced 1st gear because I don't think the tires would be able to sustain 1.2g in real life, so I reduced it to slightly above 1g. I also adjusted the spacing between gears 2 to 6 so that the engine always remains in the power plateau, which should yield better theoretical acceleration. Quote:
Well this is relative. Small changes in gearing, where the average (or total) power produced during the whole acceleration run is unaltered, will not have an impact on trap speed or ET. However, if by optimizing the gearing, more average (or total) power can be produced for the same acceleration run, in such case, ET and trap speed will be better. The more extreme example is imagining doing a run in only one gear... Last edited by CanAutM3; 06-03-2013 at 07:06 PM.. |
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06-03-2013, 05:25 PM | #43 | |
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06-03-2013, 05:28 PM | #44 |
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Swamp,
No matter what the 0-60 ends up being, your calculations are impressive. Thanks for all the hard work you put into your analysis!
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