Very intersting indeed:
Just for grins, I did the calc. for the 2010 M3 motor. It has a stroke of only 75.2mm for its 92mm bore, whereas the 5.0 is a nearly "square" motor = same bore + stroke.
SO, at 8000 RPM the M3 motor is moving at a "measly" 3950 FPM.
Bottom line - I personally WOULD NOT TRUST the tuners telling you this engine can EASILY handle >7500 RPM. There's a post where Brenspeed says 8000 RPM hard limit is not problem "it'll run all DAY at 8000 RPM".
Well did they mean it'll run for ONE day?!? It's not THEIR engine that is gonna grenade. I'd like to hear from AM/Bama and Brenspeed some data on just HOW MANY engine rebuilds they've done (or other issues) in the course of developing their tunes.
Remember, they're basically DISABLING your knock sensor (fixed octane tune only) AND bumping your rev. limiter. I'm sure they're trying to be fairly conservative, BUT... There IS likely to be some longevity issues with these tunes. The motor is also SO new, there's no long-term reliability data on "mods" yet...
Where in the world do you get your info?
While your post BEFORE this one I quoted was great, this one is way far off base.
We just said the limiter was 7500RPM. Which, based off of your 4500FPM logic, is perfect.
How many engines did we rebuild? None. We've tuned thousands without a failure. We've built high-revving 3vs for years. Even Ford Racings auto calibration (when it's done completely) is going to be set up similarly.
While I don't agree with Brenspeed that this motor "can handle 8000RPM all day" (there's a reason the Boss comes with valves, springs and retainers, and it's not JUST the cam difference), I totally think this motor can handle 7300RPM shift points and a 7500RPM limiter to bounce off of.
Our auto 2011 GT is running strong as can be. The car has probably 200 dyno pulls and a similar number of track runs, all hitting 7300-7500 RPM. That and it's got countless hours of seat time datalogging on the street, hitting the WOT shift points on multiple occasions.
And while I can't speak for Brenspeed, we DO NOT disable knock sensors, so I have no idea where you got that idea. Knock sensors are completely left functional with our 2011 tunes.