New 2012 M37 owner here, sold my 1998 Mercedes SL500 and 2009 Tacoma Prerunner to join your club:
The M37 just looks like any other Aspen Pearl 2012 M37--I do like it a lot though--I do not have to worry about it's breaking each time I start it--the SL500, with just 63k miles on it, had gotten too expensive to maintain with some plastic or hydraulic bit breaking each time I drove it;and after a stroke in January I found I could not get in and out of the truck confortably (had to sell my Honda Silver Wing 600 too). THe M37 is just as quick as the SL500 too, Which despite 16 more HP and 100 lb·ft higher torque was a lardass at 4800 lbs. wet wit a driver...
Enough about all that though; I though some here might be interested in a couple of online "calculators", revised from my "Mustang and Miata " days of 15-20 years back: the first charts how the M37 (or 56) theoretical top speed(s), it shows speed v. engine rpm in each gear assuming the engine could produce sufficient HP to attain that speed.
M37 Speed in Gear Calculator
Looks like this:
Here is another that calculate how much horsepower (at the wheels) would be required to push a M series to an indicated speed. It is based on the vehicle being locked into 5th gear as that is the gear in which engine output and top speed are most likely to be in alignment (for an M37). THe column labeled "RPM (JATCO 7-speed in 5th) 3.35 - 2.61
" displays the engine RPM at the indicated speed (1st column) for the M37 (3.35:1) and M56 (2.611:1) final drive gears and the tranny being in 5th gear.
M Series HP v. Speed Calculator
Looks like this:
Many assumptions and assertions are made in the vehicle description" input section--I have based these on data from the web and other sources. However the formulae behind the calculations have proven themselves solid over the tears.
I would enjoy comments and feedback...