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Is your 4S/Turbo really 4WD?

P

Peter Comiskey

New member
Maybe its torque bias to the rear ... maybe its viscous coupling slip ... maybe it perfectly normal, but clearly its got me thinking.
In a recent quick start from a junction, road a little wet but nothing like Montreal for a Red-bull, I managed to get significant wheel spin from the back wheels whilst 'accelerating sharply' ... the sort of juddering/hopping sound when they are really fighting for grip, but at the same time no complaint from the fronts. After this short burst and the PSM reined in the 3.8, normal service resumed, but I was left thinking is this normal behaviour in a C4S.

I've fair experience with other Porsche's, this one's my seventh, but non with 4WD, and maybe I'm expecting to much?
Do let me know other experiences with 4WD, and if there is a way to check our viscous coupling's are doing their job....

Cheers,
Peter



 
Gen 1 or 2 Peter? The Gen 2 has electronically controlled clutch plates to the front wheels so I presume you are talking Gen 1 here with viscous coupling? Certainly on the Gen 2 cars the front wheels kick in almost instantly when required.
 
If it is viscous coupling then you only get 5%drive to the front,so it is a bit like a rear wheel drive car
until you reach higher speeds then you get 30% drive to the front for stability.
 
There's a nice video on the official Porsche channel on YouTube that shows a 997.2 Turbo on the ice hill at their Silverstone facility - a section in slow motion shows how the wheels slip and are then controlled.

I've found it on the website - watch from about 2/3rd of the way through:
http://www.porsche.com/silverstone/en/multimedia-overview/multimedia-porschetv/
 
Thanks guys. That makes sense, especially having seen the Porsche websites videos of the gen2 vrs 993.

Although does appear that in terms of 4wd, the 997gen1 didn't move the game on a huge amount from the 993...
 
Did you know one-click on the handbrake and it is 2 wheel drive (but don't tell anyone I told you that) [;)]
 
ORIGINAL: Oggy

Did you know one-click on the handbrake and it is 2 wheel drive (but don't tell anyone I told you that) [;)]
Click to expand...
Only on the Gen 2 - but I didn't tell you that either.......[;)]
 
Sure it's only Gen2???

I have put it to the test on some very challenging surfaces and the difference was remarkable...
 
I was told it's the ones with the electrickery front diff but maybe not - or maybe your imagination Doug! It certainly made the ice hill rather entertaining in mine with "one click"!
 
Lol, was driving up the ice hill I tried this also. One click and turned into a completely different experience [;)]
 
"Exactly" we don't know but it supposedly prevents the front wheel drive clutch from engaging so that you have a 2wd car. A "hooning" tool, presumably![:D]
 
ORIGINAL: Peter Comiskey

Ok. Maybe I should know, but what exactly does 'one click' do then?

Intrigued..
Click to expand...

Definately de-activates the 4WD system....turns your Turbo into a de-tuned GT2 [:D]

Why ?? not entirely sure but perhaps it's in case your car is towed with only rear wheels in contact with road ??
 
ORIGINAL: Oggy

Why ?? not entirely sure but perhaps it's in case your car is towed with only rear wheels in contact with road ??
Click to expand...
I reckon the "why" is the same answer as "why launch control"? Because they can..........(they being the engineers)[:D]
 
ORIGINAL: unclewinks

Why only on the gen 2 and not the gen 1
Click to expand...
Doug seems to think it is on the Gen 1 too but I was told only Gen 2 as it has the electrickery front clutch.
See here
http://www.renntech.org/forums/topic/34082-2wd-with-a-simple-trick/
and here
http://forums.rennlist.com/rennforums/997-forum/586271-turning-off-4wd-on-a-c4s.html
and here
http://www.6speedonline.com/forums/997/166678-pulling-parking-brake-one-notch-pdk-4-wheel-drive-models.html
 
I tried the 2WD thing on the low friction surface at Silverstone DEC in a Turbo 'S' a couple of weeks ago and it doesn't work.

However, the car will drop down a couple of cogs if you blip the throttle under braking which is quite useful.

When I used to drive Mitsubishis, from the Evo 7 upwards the handbrake would disconnect drive from the front viscous coupling so as to facilitate handbrake turns in the rally cars - you don't want all 4 wheels locking up when you're negotiating a hairpin bend at a rate of knots. [&:]

Probably not quite so important in a Porsche! [8|]

Regards,

Clive.
 
ORIGINAL: Lancerlot

I tried the 2WD thing on the low friction surface at Silverstone DEC in a Turbo 'S' a couple of weeks ago and it doesn't work.

However, the car will drop down a couple of cogs if you blip the throttle under braking which is quite useful.
Click to expand...
When did you give it the one click Clive? I believe it needs to be done with the car stationary. Certainly made a difference to mine on the ice hill!
Find the paddles easier for two quick down changes but then again I can't do that left foot braking thing like you clever chaps![;)]
 
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