Remember this article about the new 6.2 engine, there's a reason they dropped the torque to 456 lbs. What kind of torque are you getting after the current mods that are available. Does the newer models have a stronger tranny? See article below:

Ride the Future of Mercedes-Benz Performance
By: Scott Oldham

Date Posted 07-21-2005

Mario Spitzner, the director of branding, marketing and sales at Mercedes-AMG, raises his voice to be heard over the two AMG CLK DTM coupes screaming past down the front straight. "What makes AMG famous," he yells as the cars roar by and begin another lap of the historic Paul Ricard Formula One test track just outside Marseille, France, "is torque."

Mario may as well have said Michael Jackson is bizzaro. AMG is the king of torque, and everybody knows it. The supercharged 5.5-liter V8 in the first of the two AMG CLKs to fly past makes 579 pound-feet, and the twin-turbocharged 6.0-liter V12 in an AMG SL65 makes 738 lb-ft. A Dodge Viper is only packing 500.

But all that torque, while good for turning tires, can eat transmissions like the Cookie Monster let loose on a plate of oven-fresh oatmeal raisin. And that is why the entire present range of AMG cars equipped with the supercharged V8 or the twice-turboed V12 are also equipped with the company's archaic five-speed automatic transmission. The five-speed has a torque capacity of 796 lb-ft, while Mercedes' new seven-speed can only handle 542 lb-ft. What to do?

Well, if you're Mercedes-Benz, you instruct AMG, your in-house tuning firm, to design a new normally aspirated engine that delivers more horsepower, but less torque. Less than 542 lb-ft. That way, the company's fleet of super-high-performance cars can benefit from the added gears of the seven-speed.

The Recipe
AMG went to work and designed its first all-new production engine in 30 years. An engine with four valves per cylinder, all-aluminum construction, a variable intake manifold made of magnesium, variable camshafts, a lofty 11.3-to-1 compression ratio, and the world's first use of a special low-friction cylinder wall coating called twin-wire-arc-sprayed (TWAS), which is a complicated process borrowed from the company's racing program.

It starts with a high-pressure water jet that roughens the cylinder walls. Then two metallic wires and an atomized gas are brought together and high voltage is passed through the tips of the wires, which begin to melt. The gas then removes molten metal from the wire tips and sprays those particles onto the cylinder walls, where they solidify. The cylinder walls are then honed to perfect the surface.

The engine's bucket tappets that control the valves are also borrowed from the racing program. AMG says the space-saving design allows for a stiff valvetrain and therefore higher engine speeds with large valve openings and ultimately more power.

The desire for higher-rpm capability also necessitated the design of a new engine block. AMG changed everything, from the distance between cylinders to the structure of the crankcase to the bore/stroke ratio.

Other tech highlights include conical exhaust-valve springs to dampen vibration, and double-intake-valve springs to better control the large intake valves. "In a normally aspirated engine," says Bernd Ramler, a director of powertrain at AMG, "you need to close the intake valve quickly."

He pauses as the lapping CLKs roar past. "You also need more intake capacity because the air coming in is no longer pressurized. This engine has two 70mm throttle bodies. The supercharged 5.5-liter has one."

Dinner's Ready
The resulting engine is awesome. It measures 6.2 liters, revs to 7,200 rpm and delivers 503 hp at 6,800 rpm and 456 lb-ft of torque at 5,200. It's the second most powerful normally aspirated production V8 in the world behind the 7.0-liter V8 in the 2006 Chevrolet Corvette Z06, which is rated at 505 hp and 470 lb-ft.

Plus, it emits less carbon monoxide and hydrocarbon than the blown 5.5-liter, and it weighs 55 pounds less, mainly due to the elimination of the heavy supercharger. "The weight loss was one of the points of going to normally aspirated," says Jan Stotz, who is the head of project management at AMG. When we asked him what his title means, he said, "This engine is my baby."

Endurance Trials
And his baby has been put through the ringer.

 

I missed this the first time around if it's a repost so thanks.

 

lots of talk on the engin but very little on the transmition

 

i missed it too and was wondering about the TQ drop. the E55 had 516 i think, then i looked at the E63 and saw it had less so it made me wonder.

 

The torque on these cars are intoxicating. I thought my E55 had torque but after shifting to the 65, forget about it! The thing just pins you to the seat instantly , If they take away the torque it's game over, at least for me. .

 

unless you're going FI or n2o, this shouldn't be a concern.

 

ehhh...you'll be fine as long as you don't do a "12 second burnout".

 

It's nice to know that our trannies can handle 796 lb-ft.

 

Hahahah, You are a trouble maker mike. Lol!

 

lol, i just stirred the pot with a few honest (and accurate) observations. you should have seen all the insults and threats that were hurled at me and got removed!

what was even more funny was the further false claims by asr that gustav did something or contacted me with regards to pointing out their bs. gustav never once contacted me about any of my posts (probably because i was right on with my observations).

 

I agree. But I was puzzled why such a low trap speed for the 63 car. On the bottle should have definitely been higher, don't know if the response satisfied my curiosity. Ohh well I guess we will never know. lol!

 

Good read....... thanks.........

 

What am I missing here?????? Do share. Is this from another board?

 

they can handle a bit more then that without grenading, ive got almost 900lbsft going to mine

 

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Yup ASR CLS63 trapped only 118 or something like that with I think 100 shot. Should have been abit higher. I asked ASR and they said the guy did a 12 second burn out and overheated the tranny causing it to drop MPH...dunno...

 

I saw that. I don't quite understand it, so I politely asked for an explanation.

 

I wonder what effect the upcoming VRP Supercharger for the 63's will have on the tranny.