Kevin

Your clutch should be gone with the tuning numbers that you have posted??????

Alex (UK)

The delivery is so smooth now, I think the stock clutch is going to suffice (for a few months anyway)

Alex (UK)

Quick update: Done about 5000 miles in the car now. Engine just as smooth, stock clutch fine, exhaust resonance between 2-3k revs fading, no problems what-so-ever.

Still smiling!!

TB993tt

Alex, great to hear is is going well and you are enjoying

You may be interested following my comments earlier about the torque numbers quoted by CG, during discussions with RS (about 997 kits) who say that the kits are more like 750NM because even at that level the rods are at the edge of their limits.... They did a few kits at the high 700sNM and rods were bending for fun -remeber we are talking engine dyno torque not RWTQ from a chassis dyno, go on one of those and you will see your 800+NM

Alex (UK)

Quick update: now up to 16,000 miles and the engine/exhaust are still amazing, and fault free. You can feel the difference when the weather gets colder though, suddenly a lot more power on tap and a lot less grip!

Changed the oil in the car after 10,000 miles and that made the engine a lot smoother too (as did the VTG lubrication recall, but not to the same extent).

Still not really using all the power available, ie. rarely use overboost in sport mode, there's just no need.

The only very small gripe is that during a recent track day the exhaust was getting so hot that the (stock) tips kept slipping down and I had to tighten the fastenings back up afterwards.

Track day video: http://www.youtube.com/watch?v=YOGlsIP0sjY

Alex (UK)

I got my first clutch slip today in 6th gear with an ambient temperature of 7 degC. I floored it with over-boost off (1.0 bar) from about 50 mph. I couldn’t get it to do it again even with overboost (1.2 bar) in 5th gear downwards.

I can still smell the burnt clutch an hour of driving after it happened.

Does this mean I need a new clutch or is one clutch slip no big deal? Saying that, I did have a similar thing reversing up a steep hill back in 2008 in Switzerland, the smell lasted for about 20 mins then.

I know I have 798Nm torque with my CG544 kit which exceeds the factory clutch tolerances; perhaps I need a whole upgraded clutch kit?

Eg. Cargraphic Clutch

Or perhaps just an upgraded pressure plate?

My car only has 17k miles on the clock so I would rather not change the whole clutch out unless I really need to.

Would appreciate your thoughts...

(also opinions on single mass flywheels please as part of that kit mentioned above)

GlennMc

Yep, upgraded clutch required.

A few friends had the same thing when they started running crazy power on their 996 X50's, clutches just wouldn't take it.

I think they all went to a Sachs clutch.

Light fly wheel will be nice for track use, but wll be noisey in day to day on idle.


Slippery slope of tunning i'm afraid.

Alex (UK)

Thanks Glenn, surprisingly my Turbo has been fine for the last 15k miles with 798Nm on tap. Perhaps it's just the colder weather...

eclou

Alex just get an upgraded Sachs pressure plate.

Alex (UK)

Hey Gene, thanks. It's hard to take you seriously though with a blue face avatar

What exactly are you running in your Turbo clutch-wise may I ask?

Land Jet

Love the P40's.

DLJ

Thanks for the very informative piece, Alex. Also the pic of your car is really great!

GT

Heavy duty sachs kit. Been using those for years on 996tt and 997tt. They are better on all counts than the stock unit and also have slightly better feel. You ll need it anyway for any more power/torque. You can see it at www.carnewal.be ask for Gert.

Alex (UK)

GT - do you have a LWFW? If so what are your opinions on this?

TB993tt

Alex, I went with standard flywheel but uprated clutch. Downsides to standard flywheel is that the engine sort of keeps reving when you change gear compared to LWFW where revs drop immediately but standard keeps the engine more civilised in terms of no chatter at low revs and possibly easier to get off the line. The LWFW makes the engine that little bit rawer - had it on the 993tt and it was great but fancied something different on the 7, no wrong choice.