4Matic (all wheel drive) W216 M278 twin turbo V8 powered 2011 Mercedes CL550 dyno tested - 357 wheel horsepower
A month ago we brought you CLS550 M278 twin turbo dyno
results. That dyno was from a rear wheel drive car. Insideline did a dyno test of the 4Matic CL550 and the results are similar yet higher than the the numbers OE Tuning hit in the rear wheel drive CLS550. Since the 2011 CL550 is all wheel drive, Insideline could not use their usual dynojet and instead used GMG's AWD Mustang dyno.
The car hit 357 wheel horsepower to all 4 wheels on the Mustang vs. 342 for the RWD CLS550 on the OE Tuning Dyno Dynamics. The numbers are fairly close but it goes to show how different dynos read differently.
Insideline also compared the CL550 to the Nissan GTR for fun. That graph is below.
2011 CL550 vs. Nissan GTR