posted December 17, 2009 01:59 AM
180hp BMW?!?!?: anyone see anything wrong with the hp/tq curves? maybe it's just me, but hp & tq don't seem to jive...
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posted December 17, 2009 06:20 AM
Wow, that doesn't make sense. In this universe, equal torque at equal rpm should lead to equal hp. What magazine published this graph?
posted December 17, 2009 09:46 AM
When has BMW ever put out honest info on their bikes? Anyone remember the busa beater that never was? Good ol BMW, what will they come up with next?
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quote:When has BMW ever put out honest info on their bikes? Anyone remember the busa beater that never was? Good ol BMW, what will they come up with next?
Who does? but this one seems to be a bit different with the HP claims seems to be a strong one. RR World got 179hp , Arrow and Akrapovich have similar numbers, MCN which I do not put alot into thier claims but do have a video of the dyno run ( I know means jack shit ) but BMW may just have a strong runner and makes sense when they are targeting the Big 4 litre bikes.
Will wait and see what transpires when posts start popping up from new owners.
posted December 17, 2009 04:39 PM
Edited By: almost_les on 18 Dec 2009 00:42
look at 11,000 rpm. the torque shows about 78ish ftlbs of torque. plug this into the equation hp=(TQ*rpm)/5252 and you get 163ish hp. now lets look at it backwards: TQ=(HP*5252)/rpm. if you make 180hp at 11,000rpm you need about 86ftlbs. what is shown on the hp chart is total bullshit
posted December 17, 2009 07:16 PM
Not Right, clearly. It's the mysterious .Bruntingthorpe effect
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
posted December 18, 2009 07:54 PM
Went to the Akrapovic site and it looks like that hp peak occurs at a lot higher rpm (13200)than the MCN chart indicates(11000). That line should be moved farther to the right......the overlay is not right. That changes things a little.............
Doesn't that make sense? They just blew getting all the graphs overlayed properly??
posted December 18, 2009 08:10 PM
If you take that line by the peak of the curve, and drag it over to 13200, wouldn't the graph look about right? Looks like it would be making less hp and tq at 8500 and below......... ____________
I'd Rather Be Roadracing.
posted December 18, 2009 09:46 PM
Edited By: tcchin on 19 Dec 2009 06:01
I think the whole report is suspect. The caption says that the Yamaha cross-plane motor rules the midrange while the BMW makes the most power. From the power chart, it appears as though the Honda rules the midrange from 5.5-8.5k (relative to the other Japanese marques), yet that isn't reflected in the torque chart. As I said before, power and torque are not independent values - they are linearly dependent - so if you're making more torque at a given rpm, you're also making more power.
Curiously, at 7k, the highest torque curve (Yamaha) comes close to matching the highest power curve (BMW) with ~80 lb-ft and ~107 hp. After that, the slope of the R1 torque curve begins to go negative, while the slope of the BMW power curve appears to go more positive, which does not match.
Another oddity is that there are two torque traces that redline before 12k, yet all of the power traces go well beyond 12k before hitting redline.
posted December 21, 2009 08:05 PM
Was over at gixxer.com.....MCN tried to fix their dyno charts but still goofed them up. However I think the Beemer is going to trounce everyone else in the hp wars.......
posted December 21, 2009 08:59 PM
Like I said above, they still goofed the graphs up.......but at 13,200, it's really pumping out the hp............
Someone will have one on the dyno soon.........like Kerry at AreaP..........then we will know the differences between it, the Ducati, the Aprilia and the Japanese bikes.........
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I'd Rather Be Roadracing.
posted December 22, 2009 09:25 AM
I can't believe that they scaled the plots in the first place, and that they were even able to "correct" them. They must be using a different version of Excel than me, and they certainly aren't using WinPEP!
RRW&MT has dynoed this bike and got about the same ~180hp. I hope that 14k redline is real. That would be impressive if it were. My engines get really angry with me when I try to make them turn 14k... I assume that the stroke is very short on this motor to keep the piston speed in check.
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posted December 17, 2009 01:59 AM
Edited By: 
posted December 18, 2009 08:10 PM
