09-26-2013, 01:44 PM | #23 | |
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I think one of the DMT drives commented that it behaved like a NA engine |
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09-26-2013, 01:49 PM | #24 | |
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Tachometer red line lights
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09-26-2013, 01:49 PM | #25 |
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Do you guys see that there's an auto start/stop function! I hope that's disabled from start.
Because that'll be bad if it shuts off on traffic lights and stop signs |
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09-26-2013, 01:55 PM | #26 | |
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And BMW has said that torque is well above 500Nm/396lb.ft, so that's why it's safe to assume a higher torque than that... And as HP and torque is related some have also extrapolated what sort of HP goes with that torque That's why different numbers are being thrown around here |
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09-26-2013, 02:03 PM | #27 |
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very good for a boosted motor period.
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09-26-2013, 02:06 PM | #28 |
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While I'm sure this is going to be a great car to drive, I am a bit disappointed by the 7500RPM limit.
I also don't get why people are saying it's "good for a FI engine" when there is no good reason a FI engine can't be high RPM too... like a R34 GTR having an 8000rpm redline from the factory, 15-20 years ago!! Still want one though! |
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09-26-2013, 02:08 PM | #29 |
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Well the torque is available at low rpms so it's not like you need a red line that high. Plus the max hp is typically lower on these motors. But it's a typical straight 6. I wouldn't expect it to rev higher than the N52/54/55
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09-26-2013, 02:09 PM | #30 |
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09-26-2013, 02:11 PM | #31 |
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Why do you feel that the S55 won't be able to breathe at high speeds? There is no technical reason why an FI motor cannot hold power output right up to redline. The N54 behaves as it does because of design decisions that were made to appeal to a specific target market. The M cars have always focused on the higher end of the RPM spectrum. There is no reason why this motor HAS to be any different.
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09-26-2013, 02:13 PM | #33 |
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Eddien123: Agree you don't need it but it makes the experience more special... Would you prefer a Ferrari 458 with a 7500rpm limit in exchange for some extra torque? I know it's not exactly the same as it's N/A but since this is an M product, the focus should be on the driving experience and I'd gladly sacrifice a bit of grunt lower down in exchange for a wilder top-end!
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09-26-2013, 02:15 PM | #34 | |
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Swap always makes very valid points and backs them up with some very detailed data most of the time. |
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09-26-2013, 02:18 PM | #35 |
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In all the videos of the DTM drivers driving the M4, none of them took it to redline. Either they were told not to or they know the power dies off prior to 7,500. Oddly most of the time they shifted prior to 7,000.
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09-26-2013, 02:18 PM | #36 |
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Lots of M3 owners are going to be bumping the limiter a lot more now.
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09-26-2013, 02:19 PM | #37 | |
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This is true in ALL gears. |
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09-26-2013, 02:19 PM | #38 | |
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09-26-2013, 02:20 PM | #39 | |
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Bring this engine to redline, everytime. |
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09-26-2013, 02:21 PM | #40 | |
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09-26-2013, 02:30 PM | #41 | |
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Previous NA M cars had good throttle response all over the rev range but, were guttless at low speed. The standard retort from enthusiasts was that M cars were meant to be driven at high engine speeds. Detractors would always bemoan this characteristic, claiming it's boring. So, two days ago (almost), BMW releases official specifications for the S55, showing it favors high speed performance. This is in keeping with past S motors but now people want boost from -2000 rpms? Can people make up their mind? A 3L turbo with an ~7.5k rpm redline, 3.5k rpm power band and high speed performance is almost exactly in keeping with the engine characteristics that BMW has been engineering into their S motors for the last ~30 years. I don't understand the complaints, aside from maybe the reduced throttle response at mid-range engine speeds. |
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09-26-2013, 02:37 PM | #42 |
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Seems the new M engines are tuned more towards midrange power. While fun on the street when driving 6/10ths and you dont want to stretch out each gear, at the track where you are flat out all the time, I would prefer a powerband shifted more towards the right.
7500-7700rpm is spot on with the predictions. But lets see, on most cars aftermarket software will increase the rev limiter, so hopefully we could se close to 8k rpm with an aftermarket tune? Maybe not worth it for stock turbos since the powerband seems to be very strong in the midrange and drops at high rpms, but I imagine with a nice aftermarket turbo kit which develops power all the way up to redline. 8k would be great. |
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09-26-2013, 02:41 PM | #43 | |
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If you had two career paths, both on a 10 year contract, both starting with $100k in pay. One gave you a 21% raise the first five years, but none after that (pay after 5 years being $259k) while the other gave you a 10% raise every year (pay after 10 years being $259k). Are you going to take the first job or are you going to complain that you wouldn't get a raise every year and take the second?! Last edited by ScarecrowBoat; 09-26-2013 at 02:47 PM.. |
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09-26-2013, 02:41 PM | #44 |
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The crux.
The power output seems to just start to taper right as the car hits redline; enough to measure the decrease but not enough to feel the difference. Looking at the torque curve, it seems that the engine will have no room to breathe at higher speeds. Increasing the rev limit won't be useful, with those turbos, I wouldnt think. |
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