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#31
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
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#32
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Ah, I guess I never really thought about active computer management limiting torque the way it does and at the point that it does. That is pretty impressive. I guess what impresses me the most now is that there really isn't a measurable (seat-of-the-pants) improvement with valvetronic versus without.
In essence, they seem to have actually RESTRICTED the engine in order to improve driveability.
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2007 BMW X5 4.8i - Sport Package, Wife's Car 2001 BMW 325i - My Car. 2005 Ford Excursion Limited 4x4, 6.0 Powerstroke Diesel. My first "grown up" car. |
#33
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Quote:
The X5 35i rating is the lowest of four or so different ratings, IIRC, but is broader.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#34
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And that is, indeed, the truth. Broad, flat torque curves with lots of "area under" not only improve driveability, but improve fuel mileage, due to the reduction in time spent with large amounts of throttle input.
Hence, this is probably why the traditional "diesel versus petrol versus turbocharged petrol" seems to favor diesel until technology catches up on the turbocharged petrol side of the house. Interesting. Thanks for bringing a engineer's perspective into the discussion. I know a fair amount about things like this, but it was good to hear another side of the story, rather than gas purists screaming at diesel enthusiasts, and vice versa.
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2007 BMW X5 4.8i - Sport Package, Wife's Car 2001 BMW 325i - My Car. 2005 Ford Excursion Limited 4x4, 6.0 Powerstroke Diesel. My first "grown up" car. |
#35
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Drove for the first time on an extended highway trip for 118 miles on a 2-lane highway through 9 small towns so had to slow down and accelerate often and got 31.7 MPG. Cruise set at 62 MPH outside of the towns. Sure is nice filling up much less often than with the M6 although diesel is still more expensive than the 93 octane premium.
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Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out and loudly proclaiming: "WOW! WHAT A RIDE!!" 2007 M6 2018 Chevy 2500HD Diesel Alaskan Edition 2011 X5 35d 1972 Chevy K20 4X4 1972 Ford F-600 1959 Chevy Viking 60 Dump Truck 2015 CanAm Outlander XT 1000 |
#36
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That is true for all engines,gas and diesel.You mention to the the other guy that we have to look not at the engines alone,but with the tranny and diff,as a complete drivetrain.But you now compare both engines as a standalone units.You miss to point out that the shorter gears on the diesel completely make it up for the narrow powerband for the sake of less torque to the wheels.But really the biggest downside of the US diesel to the 3.5i is the 6 speed tranny.The diesel with it's narrow powerband is the one that needs more gears.
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#37
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Yes, it is. But given the higher torque ratings of the diesel, at a given rpm and load, the diesel has more surplus torque, ie more headroom. So it can be programmed to shift less. That won't make it faster, but it provides that sense of power that makes owners think they have more hp than they do.
BMW could install a transmission with more ratios, and has done on newer models, but I suspect there is a diminishing return there.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#38
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Or CVT LOL
__________________
2007 BMW X5 4.8i - Sport Package, Wife's Car 2001 BMW 325i - My Car. 2005 Ford Excursion Limited 4x4, 6.0 Powerstroke Diesel. My first "grown up" car. |
#39
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Quote:
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