The last gen M5 will always have a special place in my heart
Mine too. It's an irrational thing though, and I recognize it. The transmission is mediocre at best, and the engine is thirsty, loud, and high maintenance. However, when you wind it over 8000RPM, it just seems magical.
Side note: 700hp helps.
What is the official speed limit in Germany? Or, better yet, what is it regulated to on the new M5? I have this car in my sights but I may hold off for the 2014 version whenl a lot of the small issues are resolved (e.g. clunking sound that may be due to the suspension; lack of side bolsters, unlike European models; next-gen i drive).
There is no official speed limit in Germany. In the cities, there are very low speed limits, and they make sense considering the congestion, street size, etc. Most major highways have a speed limit between 62 and 75 mph (100 or 120 kph). The autobahn is unregulated.
The F10 M5 is limited at 250 kph (155 mph), just like the E60 M5, and just like the E60, can exceed that speed by a bit before the limiter stops the fun. For markets other than the US, there's an optional package to raise the limited to 305 kph (190 mph).
Read my lips: I absolutely HATE the lack of side bolsters in the F10 seats. HATE HATE HATE that. I slip and slide everywhere.
Apex, I bought an F10, love the car, and I'm knocking around the idea of an ECU upgrade. It's very damned fast now, but, you know, more is better. :sneaky: Problem is, I don't want to completely kill fuel economy, I can easily get mid-20s if I'm not in a hurry. Any thoughts or opinions?
Honestly, it really depends on the software. There is software that's written well, and stuff that's just pure junk. I've had a few different ones on my car, and it's amazing what people will sell these days (some software just has some tweaks to a/f & timing, and that's it).
Well written software should allow you to keep your current fuel economy unless you're absolutely stomping on it, in which case it should only be slightly worse. The ESS software I had on the E60 M5 actually allowed me to gain fuel economy slightly, as it ran very slightly leaner (though still within very conservative limits). This was the case when the car was normally aspirated, as well as after supercharging it.
I'd suggest calling up Eloy at RacePrecision and asking him about it. He's done a good bit of tuning/programming, so he can give you more specifics:
http://www.raceprecision.com/2009/index.php?option=com_content&view=article&id=48&Itemid=30
Ask questions, don't buy until you're satisfied. Software is one of those areas where you don't really want to make mistakes. Trust is critical.