Time to up the ante, and the HP! 

I've enjoyed the Stage 1 power for over a year now, and decided to go ahead and upgrade to Stage 2. I had originally delayed because I didn't want to pay the $700+ just for the installation labor for the pulley. If you aren't familiar with Audi, to upgrade the supercharger pulley, you need to put the front end of the car into "service position". This means disconnecting a ton of stuff and pulling the front end out about 3 inches. Lots of time and effort, that I didn't want to go through. More recently, I found some posts from those that have done the upgrade by disconnecting the supercharger instead. This was to be much less extensive, with an estimated time of 2 hours. Knowing me the way I do, I figured it'd take me about 4 hours, so I bought the pulley, belt, and upgraded ECS tune and went to town.

Total elapsed time was more like 5 hours due to a few trips to the store, but overall, not too difficult. The supercharger was heavy and hard to get off of the mounting studs, but with a friend's help, it can be done easily enough.

The power delivery is now smoother through the lower rev range and even sounds better all the time.

Getting ready. . .
Close up of the air intake valve in the supercharger
Getting it up off the studs, or at least as far up as needed.
And who thought jackstands were just for holding up the whole car. The top of these nice stands were perfect for keeping the supercharger up to clear the radiator.
Just be careful of the intake seals
Pulley puller installed and ready to pull
Pulley puller installed and ready to pull
Pulley removed
Easiest part of the whole mission. Getting the new pulley on. Of course, it was heated to 350℉, so had to be careful.
Old vs New
Belt is on, job done! What's all the extra for??
Getting the wrench on the belt tensioner was a very tight fit, and I ended up dropping the wrench down into the bottom. I tied the wrench to the radiator with fishing line to ease subsequent retrievals. (At least 3 more)

Interesting for you

Engine compression is 155 psi across

Engine compression is 155 psi across

Engine
Just a little 4 Cylinders
2012 E550 4matic, 4.7l twin turbo awd. This replaced the M3. M3 was cool lookin but lacked the power

2012 E550 4matic, 4.7l twin turbo awd. This replaced the M3. M3 was cool lookin but lacked the power

Engine
We will be keeping this one for a while. Finally something my wife and I enjoy
New heart

New heart

Engine
I Just finished building an 11:4-1 440 for her. . . . comp xtream energy xe285hl cam ported 452 castings. . . ballanced. . corrective decked...
New heart transplant project.

New heart transplant project.

Engine
So now I'm adding a 440 to the ol girl. It's out of a 73 camper with 56, 000 miles on it. It's getting an auto and divorce transfer case. . . . ...
433 Pre-assembly

433 Pre-assembly

Engine
Most of the pre-assembly checking and measuring is complete. Checking to make sure parts are in tolerance for the most part is done on all...
The squirrel that brought down the tank

The squirrel that brought down the tank

Engine
About 1 year ago in the winter woke up one ice cold morning and the tank wouldn't crank. After a few minutes of messing with key and fuses popped...