Quote:
Originally Posted by speedyman
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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I thought the same thing, because both my previous two BMWs were both underrated. I "think" BMW does that, so they can't be sued later by someone that lives on the top of a 12,000 foot mountain, that mysteriously stays 105 degrees Fahrenheit all year long. I "think" their estimates are a "worst case scenario". Once you get down at seal level, in a cooler environment, hp numbers go up significantly.
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 de-tuned 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".