I love the lightweight, single mass flywheel! The Porsche dealership here just called me though, and read a statement saying the flywheel can cause vibrations, which can stress the engine. Any resulting damage is not covered by warranty. I think Porsche is just being precautionary. I trust the engine they built. Anyone disagree or have any insight?

How would it be different for the GT3 RS?

 

it may sound like an old train due to single mass flywheel. maybe they just don't want u to complain the noise after the install.

 

Noise from the flywheel is not an issue for me.

 

Porsche with in the last few days has sent a bulletin out to the dealers letting them know that any failures resulting from the RS SMF being installed on the Gt3's will not be covered under warranty,


Since the 911 GT3 (997) engine application is designed for the dual-mass flywheel, conversion to the
single-mass flywheel results in the following problems and consequences:
• The single-mass flywheel causes fluctuations and vibration in the lower rpm range, thereby reducing
the smooth-running performance of the engine.
• The crankshaft is subjected to one-sided loading, causing stress peaks that can result in damage to
the crankshaft.
• The one-sided loading of the crankshaft can cause the pulley to come loose, resulting in damage to
the belt drive and engine.
• Any damage relating to conversion or damage that can be attributed to conversion is not covered
under warranty.

 

WTF is the difference in a gt3 and F... GT3 RS!!!!!!! they are completely FOS!!!!!!!

i assume some will belive they wont cover warranty items when tracking the car??? even though "circuit" driving is discussed in the owners manual

 

i refuse to believe this voids some warranty. this is probably porsche's way of saying, when doing the rs lwfw, do the rs pulley too.

 

Good point. I already went through the mangled pulley. It happened about a week after the LWFW install.
I also agree with the comments from 930man.

What is up with Porsche on this one?

Ranger

 

Sounds like someone read this thread on Renntech.

 

Wow, thanks for the link.

 

i highly doubt a lightweight flywheel would cause such a problem.

 

by coincidence, i've just asked my dealer (2nd time) about the LWFW for my GT3, and for the 2nd time, they were informed by Porsche Germany that this is not an approved mod.

i didn't force the issue, as my car is still under warranty

 

Same here. Nice link! Great!

 

The inconsistencies are way to prominent here.
Why would other reputable Porsche dealers proceed and do the flywheel change?
I am not getting it.
Why is it not a problem for the GT3RS?

Ranger

 

They proceeded before Porsche stepped in and said its a no no....

 

If the LWFW caused the problem, we'd have seen a ton of this in all the cars out there with LWFW from the aftermarket.....sort of like Porsche saying driver abuse causes 2nd gear pop-out. Think of all the hot rodders doing this out there to corvettes, hondas, and the like....you don't hear about crankshafts too much.....

Nope. They are a good company, but they have some rough edges like all other companies.

The second gear pop-out is a design flaw that is documented. NTSA should make them do a recall IMHO.

On this, 12k track miles on a cranshaft.....hmm.....probably just wear and tear and a metal pour/cast error. Porsche should just cover the issue and perhaps beef up/billet/machine cranks on their high hp cars (gt3's, turbos, gt2's...).

To prove their point, they need to provide the data suggesting all the 997GT3RS's on the road have been balanced formally....show us the data. I suspect there is none.

My opinion of course.

I am sure the RMS is the driver's error too.....in NA cars. And, it has been "fixed" several times so far. Rough edges. They'd be well served to come clean and just take care of customers. Given the current economy, they need us more than we need them....

I know that BMW treats their customers better.....so does GM (Nissan...not so sure.. )

JB