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07-19-2011, 10:50 PM | #111 |
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BTW - would a rear-drive car with either a: 1) manual transmission; 2) automated manual, i.e., MDCT; or 3) modern 8-sp auto (such as on Lexus ISF) normally have about a 20% drivetrain loss? If not, what would be the standard "approximate" drivetrain loss percentage for these transmissions assuming RWD?
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07-21-2011, 02:30 AM | #112 | |
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03-09-2012, 08:20 AM | #115 | |
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01-01-2017, 09:35 PM | #116 | |
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Here it is now 2017 and we've had stock @ 560HP, CP @ 575HP, Jarhe 30 @ 600 HP and now rumours of the F90/G30 or what ever it's called will be 600HP+ all with assuringly the same basic configuration. I'd predict this engine @ 650HP+ before the production ends. My 2 bits |
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01-07-2017, 10:44 AM | #117 |
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....Yeah! There is no way going from 1.2 bar to 1.5 bar only makes for a 5Hp diff. If one did the math on the difference,...then that same diff you should reflect there about the additional increase in power. My math is showing a 20% increase in boost!
So, if BMW wants us to believe that a 20% increase in boost yields only 5 more Hp,...then that's what we will believe. Someone pls check my math!
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01-16-2017, 08:14 PM | #118 | |
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Atmospheric pressure has no bearing on the turbo specification. Bar is a unit of pressure measurement. The M5 turbos create 1.5 bar (~22psi) above atmospheric pressure. It doesn't matter if you are sea level or 5000'. Cylinder pressure will be the same at maximum turbo output. The engine won't respond as well during spooling of the turbos at higher altitude due to air density and oxygen levels but it should theoretically make rated HP once they are fully spooled. My 2bits |
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01-16-2017, 08:39 PM | #119 | |
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01-16-2017, 10:33 PM | #120 |
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I do agree the this platform might be able to generate 650 HP but then we need to see if DCT is getting redesigned or they want to use the Auto transmission. Something like the one installed on X5M/X6M
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12-03-2017, 08:22 PM | #121 |
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this article says the opposite , bmw increased the compression and lower the boost by .1 bar = 1.1 bar
who is right ? http://www.bmwblog.com/2011/09/22/bm...-of-the-beast/ |
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10-18-2023, 08:34 PM | #122 | |
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Might make sense as the m5 being a racing sedan and the X5/x6 being a big arse SUV. Wouldn't the SUV need more torque for itself vs a lighter sedan? |
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