2012C63AMG

@ Thrilla.... I don't see any issues with the stock none p31 engine, I think its well overbuilt. I don't think I have come across a topic here about any blow rod or piston....

@ Bigsl55fan- I think the C63 is unique, you are given the same engine found in the higher up AMG cars but it is simply de-tuned. As long as you go with a reputable tuner all they are doing is simply unlocking the engine to what the higher up AMG cars have. IMO you are not pushing the limits of the engine with a conservative tune, you are simply upping the engine from a restricted say 80% power output of what it was designed for to 100% found in the SL63, E63, CLS63 act.

Serge944

I think P31 isn't necessary at all. The ONLY must-have option for the C63 is the LSD.

Guilty

I disagree. LSD is not that necessary unless you don't know how to drive your car.

Serge944

The C63 has more power than traction - why wouldn't you want an option that gives you more traction??

Guilty

I didn't say that I don't want, I said that it's not necessary. I've never driven a car with LSD, I can't really compare, but I've driven a C63 without LSD and it was a lot of fun with ESP Off. From what I understand, the LSD is going to take all the fun away from the car but will help you save some money for the tires etc. (not for me)

SonnyakaPig

The LSD doesn't take the fun away. It does help certain things, though. For instance, when you launch from a stop with ESP off, the car is much more predictable in that it goes straight. That's a big plus. An LSD doesn't help save on tires, in my experience. The LSD basically eradicates wheel hop from a launch. And you can actually lean into a turn when the car has an LSD and the rear tires dig in and push you through the turn. Overall, the car feels at least twice as stable when you're driving around.

DuaneC63

Since both wheels with LSD are providing traction, the need to shove wider tires and wheels under the back end also dimishes. Stilll deciding between a factory unit or a Quaife.

SonnyakaPig

Doesn't the Quaife unit provide a greater percentage of lock? I would think the Quaife unit would be better and more durable.

Sheep

MY2012 LSD is only 30% lock, the older ones are 40% lock, but aftermarkets are 100%. So yes, Quaife locks better, but it will eat more tires at the same time.

Sheep

SonnyakaPig

Why does the higher % of lock cause more tire wear?

DuaneC63

The Quaife will only lock up 100% in a straight line. In turns it vectors the torque between the two wheels so one doesn't hop in turns. It's not like a Dana 60 or a Detroit Locker with fully closed differentials (great for drag racing but tough on the street). I'm not sure if a LSD causes tires to wear faster or its just the driver having more fun pushing the car faster around turns. BTW Quaife does not list a LSD for the C63 but I'm told the one they have for the E55 will fit.

Sheep

You are forcing the tires to spin more for better traction, but that also mean your tires will spend more time at their limit of traction, which naturally increase friction thus wear.

Sheep

SonnyakaPig

Good description. Thanks.

I've looked at getting a Quaife lsd in the past. Quaife lists two lsd's that fit the C63 on their site: QDF9V and a (*heavy duty model) QDF9V-2, both for $1062.11. These applications fit a number of other AMG's as well.

SonnyakaPig

Makes sense. Thanks.