10-01-2020, 10:07 AM | #23 | |
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The point is, it costs more to develop and produce two different things - especially complex things like engines - than it does one thing. Even small differences (including software differences - if in fact that's all it would be which, as I say, is speculative) add cost, so the more commonality, the easier it is to make the business case. You have to remember that there are probably no shortage of board members or shareholders who would have preferred to see the manual transmission disappear entirely. Why tempt fate by getting fancy and trying to diverge from the what's already being developed for the volume model? |
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10-01-2020, 11:15 AM | #24 | |
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10-01-2020, 11:49 AM | #25 | |||
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10-01-2020, 11:59 AM | #26 | ||
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10-01-2020, 12:05 PM | #27 |
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I would just add this bit
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10-01-2020, 05:39 PM | #29 |
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Extra hp? zero! Max power is achieved at 6250rpm.
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10-01-2020, 05:55 PM | #30 |
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I'am pretty sure they didn't consider this, not for a car with this price point. MT is a few percent of the market potential and they probably had several long discussions with business case reviews on the project steering board to get the a final go for the MT like it is already. Also, max hp is about 1000rpm earlier, adding a few hundred rpm more to the limiter will probably not make it faster. Also: the last few hundred rpms are the most difficult to endure. It allows for 5th gear long full throttle periods near rpm limiter on the autobahn: this destroys engines.
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10-01-2020, 06:22 PM | #31 | |
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10-01-2020, 06:48 PM | #32 | |
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According to the press release, max power for the 503hp (375kW) tune is achieved from 5,600 to 7,200rpm. So if up to 503hp can be had at 7,200rpm, theres definitely margin to make more than 473hp between 7,200 and 7,500rpm. The question is, does BMW want to ?
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10-01-2020, 07:18 PM | #33 | |
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Last edited by KoenG; 10-01-2020 at 07:31 PM.. |
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10-01-2020, 07:24 PM | #34 | |
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With this torque curve, I guess we also have an answer to the "boost threshold" question. The X3M is criticised for the lack of torque underneath 2500rpm, which is very visible here also! Nevertheless, for a 3.0 engine, the mid/top range is majestic! |
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10-01-2020, 08:36 PM | #35 |
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Yes indeed, it's seems pretty clear what they did with the S58 over the S55: Lower compression ratio paired with bigger turbos which makes for higher torque and horsepower numbers at the expense of a higher boost threshold and more lag. Not much "new tech" at work here.
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10-01-2020, 10:52 PM | #36 | |
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10-02-2020, 08:11 AM | #38 |
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LOL well there you go. The lower redline is better for long term reliability then.
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10-02-2020, 08:50 AM | #39 | |
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10-02-2020, 01:04 PM | #40 |
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Time to geek out a bit. I believe there would indeed a bit more performance to be had through a higher redline with the 6MT given its gear ratios. From the S58 technical doc, we know the S58 can still theoretically make ~460hp (~345kW) up to 7,500rpm.
Using the gear ratios published in the press release, we can find the RPM in the next gear when shifting at redline. Knowing that torque plateaus at 406lb-ft from 2,650 to 6,130rpm, we can calculate the power in the next gear. As you can see, the starting power falls quite significantly below 460hp in the lower gears:
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10-02-2020, 02:55 PM | #41 | ||
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Also, the 7th gear ratio has absolutely zero passing power at California highway speeds leaving you to constantly drop down to 6th in the Carrera. I will always, always trade a bit of fuel economy for being able to pass while remaining in top gear and avoiding the time wasted shifting before beginning to accelerate. In Germany where you can cruise at 90mph or even 120mph I can see a lot more value in that 7th gear ratio. Over here, you can keep it. |
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10-02-2020, 03:02 PM | #42 | |
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And now in the 992 they have a really weird 'manual' which uses the same box as the PDK. Feel was not likely an improvement. I couldn't agree more about long gearing. Having to drop a few gears every time you want to pass someone on the highway is annoying. |
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10-02-2020, 05:52 PM | #43 | |
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10-02-2020, 06:54 PM | #44 | |
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While your statement is true for a given gear ratio, it isn't when that gear ratio is changed. Acceleration can be defined with the following formula: a=P/(mv). So for a given road speed, the gear ratio for which the engine makes the most power at that road speed, will provide the most acceleration.
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