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crash7
Montreal


Joined: 28 May 2011
Posts: 592



PostPosted: Thu May 09, 2019 7:59 pm    Post subject: Reply with quote

sp1ke wrote:
I'm by no means an expert, but I'd wager it's not normal. I recently drove a 996 C2 with a LWFW, clutch & LSD & didn't notice any significant increase in NVH over my own C2 without these drive train mod's..


This ^

I have just had mine back with a LWFW, (sprung clutch & performance pressure plate), granted it was balanced to the crank, but there is barely any increase in NVH, a tiny bit at tick over but thats only really noticeable because I am looking for it.
 
  
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Jackzi
Silverstone


Joined: 30 Aug 2015
Posts: 105
Location: Sussex


PostPosted: Fri May 10, 2019 9:41 am    Post subject: Reply with quote

Interesting points about how it's balanced and fitted.

There is a clear and obvious increase in noise and vibration over stock in this car's case.

My thinking is to get the flywheel taken out as it doesn't sound like it's good for the drivetrain. It hasn't been in there for more than a few thousand miles, so probably wouldn't have cause any trouble, would it?
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sp1ke
Newbie


Joined: 07 May 2009
Posts: 36



PostPosted: Fri May 10, 2019 11:57 am    Post subject: Reply with quote

If you're unsure about risk of damage, then it might be worth holding out for another car.

Having said that if you're dead set on this one, then before you consider ripping out the LWFW, consider replacing the engine mounts & perhaps add the newer powerflex gearbox insert to see if they help to cure the NVH.
This may be a cheaper solution & if the mounts haven't been done before, they probably need doing anyway, so it's likely still money well spent even if it doesn't cure the noise.
FWIW I recently opted for the 993RS mounts from type911shop.co.uk (product # 9791). They were reasonably priced & made a noticeable difference.

You can still replace the LWFW afterwards if you're not happy. At which point it may be worth replacing the clutch & gearbox mount while you're at it.
 
  
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6947
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Fri May 10, 2019 12:00 pm    Post subject: Reply with quote

The LWFW should have a sprung disk, the dual mass one will have an unsprung disk. So if you are planning on swapping over then at least budget for a clutch disk to go with the flywheel.

MC
 
  
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Jackzi
Silverstone


Joined: 30 Aug 2015
Posts: 105
Location: Sussex


PostPosted: Fri May 10, 2019 7:42 pm    Post subject: Reply with quote

Thanks for all the advice. I've had quotes for replacement with a dual mass and it 'ain't cheap. So maybe the other options you mentioned like the engine mounts and gearbox work make sense as I doubt that would cost (a fair bit) more than a grand.

Do RSS mounts affect ride quality? I spoke with another guy on here who mentioned how it improves shift feel, but I don't want to make things harder as the stock 996 4S set up is good for me.

I've been hunting for over 18 months and have had to suffer 3 failed PPIs, so I want to focus on this car as it's just right for me on paper.

I just don't want a component in there that will cause problems down the line, as I'm looking at this car as a long term keeper.
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Nimrod
Montreal


Joined: 25 Apr 2015
Posts: 554
Location: East Midlands


PostPosted: Fri May 10, 2019 9:04 pm    Post subject: Reply with quote

I had one fitted to my 993 and 997.1 without any issues .

Revs build and drop quicker, throttle more responsive and I would choose one again if I modified another car .

Definitely needs a sprung clutch plate and for me worked best with RSR engine mounts . To stiff and it did become intrusive .

It does chatter a little at idle until about 2000rpm and slightly more nvh but if installed properly not an issue for me .

No issues with stalling on the 997, occasionally did in the 993 but not often once I got used to it .
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993 c4s Artic silver Boxster red
997.2 c4s pdk Guards .
997.1 c2s Hartech rebuild LWF RSS mounts sold .
996 c4s Hartech rebuild- sold
993 C2s TorB HID,Dansk 100 Cell Cat, Rss Mounts, PS10's, LWF and GT3 clutch - sold and still missed.
 
  
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crash7
Montreal


Joined: 28 May 2011
Posts: 592



PostPosted: Fri May 10, 2019 9:14 pm    Post subject: Reply with quote

I run a powerflex gearbox mount in mine along with genuine Porsche RS engine mounts.

The former didn’t make a great deal of difference, the latter did.

Engine mounts don’t effect the ride per say, but stop the engine moving around, so stiffer mounts tighten up the handling.

Stiffer mounts can increase NVH, but it’s a matter of taste and tolerance. - I find no issues with the Porsche RS items, nor the Powerflex gearbox mount for that matter.
 
  
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77szymon
Monza


Joined: 14 Mar 2018
Posts: 248
Location: UK

2003 Porsche 996 Carrera 4S

PostPosted: Sat May 11, 2019 7:53 am    Post subject: Reply with quote

I have fitted powerflex gearbox mount recently....what a change I like it a lot easy to do and cheap what not to like about it Smile gear change is more smooth and easier also feel of my C4S way batter, now just waiting for engine mounts RS these should improve even more.
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996lee
Hockenheim


Joined: 26 Aug 2014
Posts: 697
Location: Nottingham


PostPosted: Mon May 13, 2019 2:21 pm    Post subject: Reply with quote

mine has some chatter at idle

whilst driving the only time i have any increased NVH is if ive let the revs drop too low
which will happen quicker as the revs drop quicker
i know above you said it didnt drive much different
but i definitely had to change my driving style a bit when i first had mine fitted
ie using higher revs and lower gears than i would have prior

can get a vid up of it at idle if you'd like?
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Jackzi
Silverstone


Joined: 30 Aug 2015
Posts: 105
Location: Sussex


PostPosted: Tue May 14, 2019 7:58 am    Post subject: Reply with quote

A vid would be great 996lee.

Would definitely help to compare with the sound of the one I'm looking at as it seems that there are various opinions as to how much noise is tolerable.

Your experience sounds similar to my test drive - there was noise and some vibration when accelerating from low revs - around 2k in third, for example.

It didn't feel that much different to me since I usually drive using more revs anyway and don't really rely on low end torque. I've never owned a diesel or a petrol turbo, so years of driving cars where the power is at the top is probably what has done that to me.
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996lee
Hockenheim


Joined: 26 Aug 2014
Posts: 697
Location: Nottingham


PostPosted: Tue May 14, 2019 3:55 pm    Post subject: Reply with quote

will get you a video this week Thumb

but as you've described thats when mine would make more NVH 2k revs and under
hence not using revs under 2k now
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Jackzi
Silverstone


Joined: 30 Aug 2015
Posts: 105
Location: Sussex


PostPosted: Tue May 14, 2019 6:40 pm    Post subject: Reply with quote

You're a legend mate! Cheers.

The car is actually booked in for a PPI on Friday, so the guys looking at it will be able to comment on it too I hope.

Fingers (and toes and everything else that crosses) crossed Very Happy
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996lee
Hockenheim


Joined: 26 Aug 2014
Posts: 697
Location: Nottingham


PostPosted: Mon May 20, 2019 11:04 am    Post subject: Reply with quote

Jackzi wrote:
You're a legend mate! Cheers.

The car is actually booked in for a PPI on Friday, so the guys looking at it will be able to comment on it too I hope.

Fingers (and toes and everything else that crosses) crossed Very Happy


tried to get a video but failed to get one where any chattering can be heard over my exhaust
and to be honest it doesnt actually chatter as much as i think it does in my head

i did see a thread you commented in recently about a car failing a PPI was this the one?
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Jackzi
Silverstone


Joined: 30 Aug 2015
Posts: 105
Location: Sussex


PostPosted: Mon May 20, 2019 12:12 pm    Post subject: Reply with quote

Thanks for trying, I appreciate it.

The mechanic doing the PPI said the sound was normal.
However, I'm not sure about this car now as the PPI didn't pass with flying colours to say the least. I say the flywheel is probably the least of the worries now.
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