08062020, 06:43 PM  #1 
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Dyno 2020 X5 M50i
So i took a trip to Mosselman Turbos in Netherlands and got the car Dyno finally.
Crank 524 torque 814nm I have 22,000 km when the dyno was run. Car is 8 months old. I drive between 180 to 240 daily. Always in sport mode and gas was 93 with old e10 so maybe half and half. 
08062020, 08:15 PM  #2  
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Odd, the dyno shows 525.1 hp. One interesting thing about that dyno is how much it shows is still on the table with this motor. BMW allows a big torque fall off and clearly there is a lot more peak hp on the table tuned. 

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08082020, 12:53 AM  #4 
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Great post on the M50i. You mentioned "Crank" but wouldn't these numbers be at the wheel?

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08082020, 02:31 AM  #5 
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Notice the dyno say engine power. I assume he is on a MAHA or it is a guess a parasitic loss on drivetrain. MAHA do pretty well measuring that parasitic loss allowing the convert back to crank/engine.

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08082020, 10:52 AM  #6 
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Dyno 2020 X5 M50i
After a second glance, yes but it appeared to just be a title.
I am no expert and simply trying to gain more knowledge, so I apologize in advance for seeming newby'ish. Obviously the dyno was on rollers, so they have to account for drivetrain loss. Do you know what percentage they used to account for the loss? For example, if the dyno is assuming a 15% drivetrain loss, you would need to multiply 1.1765 by 445 crank hp to get 523 hp. But again, I am just starting to learn the science of this. There are 100' of smart members here to help out. Love that it looked like an all out party at the dyno place!! Cheers 
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08082020, 11:39 AM  #7  
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08082020, 11:47 AM  #8  
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08292020, 06:24 PM  #9 
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I'm no expert either but have been around this stuff for 20 years and have never seen nor heard of a dyno that reads or somehow estimates what an engine produces at the flywheel, only at the wheel.
It is well known that BMW sig. underrates their HP/TQ #s. 525 would be in the realm of 600 flywheel which is more in line with the power needed to record a 060 time of 3.8 seconds by a 2.5 ton vehicle as reported by Car and Driver. I've seen where many BMWs put there advertised HP/TQ #s to the wheel as is also commonly seen with Porsche. I'm really doubting that BMW decided to change course with the M50i and be balls on accurate. 
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09022020, 02:03 PM  #10  
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There guys are running 580 to 620 crank M3 and M2 Comps with stage two turbos. We did several runs and they calibrated each time a car was put on the dyno. 

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09022020, 08:00 PM  #11  
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09032020, 01:50 AM  #12  
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With all that said though... I think the M50i is a bit more "spot on" than most previous BMWs. Mine dynoed (stock) at 536/826nm, or 529/609ftlb... depending on if you are in Europe or the US. But... essentially the same as the OPs numbers. Minor differences can be excused by elevation changes, temperature changes, or even lower quality gas. The difference with the M50i.... is that it is MASSIVELY detuned from the factory. I gained 154 horsepower from a proper dynotune, on an otherwise stock vehicle. When the same company tuned a new X5M... they only got 10 more hp than me, and I suspect it's because an X5M can spin up a few hundred RPM more. I maxxed out at 6200 RPM, whereas the X5M maxxed out at almost 7000 RPM if I recall. Either way... only 10 more measly HP??? Keep in mind, the M50i is rated at 523, whereas the X5M is rated at 615 (I think?).... but unmodified and tuned.... they both produce the exact same numbers. The M50i just has a TON more "headroom".
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09112020, 10:07 AM  #13  
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09112020, 10:08 AM  #14 
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great data. Thanks for posting
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09112020, 12:10 PM  #15 
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The TQ #s being the same is huge as that is really what makes this type of heavy vehicle "fun to drive". These aren't little sports cars where you work at it winding them up like a chainsaw to ge the power.
There is no doubt in my mind the the M50i is at least 600 at the flywheel. Use any of the online calculators to figure a close estimate of the true crankshaft HP output based on vehicle weight weight and 060/1/4 mile times 
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09122020, 10:04 AM  #16 
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You need 630 crankshaft/flywheel HP plugged into this calculator with a weight of 5,200 lbs to yield a 12.37 second 1/4 mile @ 115 MPH.
https://robrobinette.com/et.htm 
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