Originally posted by Reflex55
...they all recommended the Sachs clutch kit. So what is your opinion on this? Any other possibilities? Specific things that I should know/expect from this model? BTW, the car is currently rated at ~452hp/410lb-ft.
The clutch is one area that's universally seen as a weak point, yet there's not been a definitive solution that's proven successful. I did a lot of research on this about a year ago, and then ended up getting a new clutch under warranty, so my investigation stopped.
My own M5 has never 'hooked up' as good as it did when new; I have a hard time breaking traction these days. Once hooked up, however, I have no complaints about power on tap. It's just that I don't go looking for stoplight drag races any more.
If you do a search using "sachs + performance + clutch," here's what you'll find:
I know of one member (540is) that installed the Sachs Peformance kit on his supercharged 540i. We've not heard much since the install on its performance.
I did have one California speed shop discourage me from trying the Sachs kit, as they said it likely would require some machining of the dual-mass flywheel to make fit. Sachs is NOT the OE manufacturer of the E39 M5 clutch--that job belongs to LuK.
If I had to make some changes on my own dime, I likely would go with an uprated Sachs clutch (can't beat the price on dial-a-clutch) and some aftermarket lightened flywheel like Dinan or UUC. I believe that would give me the missing 'hook-up' back, along with a more positive clutch engagement.
Good luck, and let us know what you find out. BTW, once you find your best price on anything Sachs, I would give the guys at Adirondack Auto Brokers a call to see if they can beat it. They are a great resource for Sachs clutches and Mintex pads (also Sachs). www.germanautoparts.com