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In Reply to: Re: Agreed, but posted by db on March 18, 2002 at 12:08:12:
M5 and 540 are obviously not the same cars and play to different folks. You can speed up a 540 to wax an M5 but there are more things to the M5 than 540. 540 is an awesome platform, don't get me wrong. I owned one for three years and I loved it. M5 is just the next step. You are correct about the resale. If you can enjoy your car then you effectively amortize the cost of all theupgrades needed to get M5 performance wise. Most don't keep it for very long, but if you can, then the ultimate sales price really is not that big a deal. Cheers.
I would think also that the 540i engine isn't made for the same hp as the M5 engine, so things like crankshaft/connecting rods/pistons/main bearings/dry sump pump (not present in the 540i), probably cooling system, would make the M5 engine much more robust and reliable; even though the supercharger on a 540 makes it put out almost as much hp as an S62 engine. In the "upgradable column" you need to consider drivetrain stuff like engine mounts, heavy duty clutch, gearbox, (the 540i auto transmission probably isn't made for that much hp), rear end, etc etc. And the brakes are much bigger in the M5, steering is much different (quicker ratio, more road surface feedback in the "sport mode", suspension is much different...). So on a track where your going around corners and braking, it is not much of a match...and I'd worry about blowing out the engine eventually... if you were to upgrade all that stuff to match the M5, it entire package would probably cost way more than a new M5 anyway.
The 540i is nice, but it's not a race car like the M5...
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