E55 has a supercharged V8 while the E63 has naturally aspirated V8.

E55 469 HP, 516 lb-ft tq

E63 507 HP, 465 lb-ft tq

 

Supercharged engines tend to have more torque, especially in the low end, compared to naturally aspirated engines. The 63 engine is naturally aspirated, so it has to rev to get to its torque peak.

The acceleration of the 55 engine has been described as being hit in the back by a bus when you floor it from a stop. The 63 engine builds torque over time so the push in the back isn't as big, but still big by most standards.

 

that's right, FI engines usually have more low end tq, and give you more push into the seat feel

but overall both cars are just as fast

 

6.4L biturbo v12 in the AMG's with those torque numbers you're quoting

 

true autobahn bomber. Torque monster. I hope the japanese catch up in this arena of cars. Its really not a car that will ever sell well because of the price, but the japanese need to step into this arena to have dominated the entire market. ( large trucks as well need a little work, although they are getting much better)

 

well most people actually lease these cars...

 

Word was the 7 speed auto could not handle the 55's torque, so the 5 speed auto was held over until the 63 was ready.

 

You are a good guy. Also thanks for posting the picture and sharing your experience.

 

haha, no worries. i didnt take it personal. I actually dont take anything personal in this forum.

 

Ha, I agree. The '09 SL is an amazing car, and the exhaust note is intoxicating...makes my E63 sound downright tame

 

guys lets not forget where the power is made on each engine, i just rememberd this myself:

the 6.3 needs to wait until near redline for all its power and most of its torque comes near the same RPM, where the 5.5s/c builds power much much quicker and tails off near the top end.