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MJA911
Magny-Cours


Joined: 10 Dec 2013
Posts: 2657
Location: Berkshire

2012 Porsche 991 Carrera

PostPosted: Thu Feb 01, 2018 11:28 am    Post subject: 997.1 GT3 visit to CG Reply with quote

Took my car to CG on Saturday for a Porsche Clinic slot with Chris and as always, enjoyable and informative, especially as it was first time there with the GT3. It had been set to factory a few months ago, but obviously CG is another level of scrutiny.

As a result I will be back in a couple of weeks for an inner rod end and toe control arm, plus geo and ride height set up for mainly A/B road use (i.e. not track or grand tourer) and potentially new front springs. I'm happy to take CG's recommendations but do have a couple of questions that people here might have a view on.

The car has been in track mode at some point of its life (CG think this may have been under the care of Fearnsport) and whilst the front top mount holes and arb holes being used now are road mode, there are additional shims on the front that widen the track by 8mm beyond factory each side, which has dropped the ride height by 10mm and may be why the negative camber is nearer 2 degrees rather than the 1.30 I thought it had be set to. CG intend to reduce the shims to factory as they think it unbalances the overall set up with toe etc. (Im not sure of that detail), but I think Ive read that the 7.2 has a wider track and is all the better for it in terms of turn-in and less understeer?

Second question is the front springs which are working fine but have some paint-loss/corrosion at their mounting points. CG say that its up to me to have these replaced or not whilst the car is in as they cannot say when they will break, but that chances are increased, if they do, the geo would need doing again. Im inclined to have them done (it adds £420 to the bill!) but just wondered if it's a little OTT, this type of corrosion is common and cars are fine with it for some time?

Many thanks for any views.
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991 C2 PDK, 986 Boxster S
Past pleasures: 997.1 GT3, 997.2 C4S Cab, 993 C2, 997.1 C2S, 996.1 C4
 
  
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911UK
Porsche Community
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Joined: 15 May 2002
Posts: 9717
Location: 911UK

1997 Porsche 993 Carrera 2

PostPosted: Thu Feb 01, 2018 12:06 pm    Post subject: Reply with quote

A wider front track does allow for benefits that the factory RS and CUP cars have.

Improves front grip, sharper turn in and a better front balance. Also there are improvements in the brakes from an increase in the platform.

These are of course all marginal increases that all add to the overall package
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Senoj
Zolder


Joined: 23 Jan 2006
Posts: 5119
Location: Sussex


PostPosted: Thu Feb 01, 2018 7:58 pm    Post subject: Reply with quote

Wider track ain’t such a bad thing as long as its not compromising the camber. At less the 2 degrees i would imagine it feels ok. Factory is 1’30” i think.

Id get the springs done personally.
 
  
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MJA911
Magny-Cours


Joined: 10 Dec 2013
Posts: 2657
Location: Berkshire

2012 Porsche 991 Carrera

PostPosted: Thu Feb 01, 2018 8:26 pm    Post subject: Reply with quote

Thanks, yes, 1’30” is what it was set at last year but it was nearly 2 on Saturday, so perhaps camber is being compromised. Front ride height was 10mm low (rear was spot on) analogy being a picnic table lowering as the legs spread, but that’s easily solved even if the shims stay. Yeah, I’ll get the springs done, will be a nagging doubt if not.
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Past pleasures: 997.1 GT3, 997.2 C4S Cab, 993 C2, 997.1 C2S, 996.1 C4
 
  
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911UK
Porsche Community
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Joined: 15 May 2002
Posts: 9717
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1997 Porsche 993 Carrera 2

PostPosted: Thu Feb 01, 2018 9:10 pm    Post subject: Reply with quote

Some GT set up’s have the front lower than std, again has similar benefits
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MJA911
Magny-Cours


Joined: 10 Dec 2013
Posts: 2657
Location: Berkshire

2012 Porsche 991 Carrera

PostPosted: Tue Feb 20, 2018 12:57 pm    Post subject: Reply with quote

So, 10 hours at CG with Chris last Friday, new front springs, inner tie rod, rear toe arm, road tuned geo and cleaned/waxed suspension. Learned more about the car and have a better understanding of how it behaves. Preference was a set up more suitable for A/B roads rather than fast road/track, so ride heights, arbs and geo tuned accordingly. Now that I've had it on familiar roads, just as as Chris said it would, the car is better able to "breathe" across less than perfect roads, the DSC module is helping too I guess Thumb
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991 C2 PDK, 986 Boxster S
Past pleasures: 997.1 GT3, 997.2 C4S Cab, 993 C2, 997.1 C2S, 996.1 C4
 



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evodarren
Spa-Francorchamps


Joined: 12 Nov 2008
Posts: 293
Location: Southend on sea


PostPosted: Fri Mar 02, 2018 11:37 am    Post subject: Reply with quote

MJA911 wrote:
So, 10 hours at CG with Chris last Friday, new front springs, inner tie rod, rear toe arm, road tuned geo and cleaned/waxed suspension. Learned more about the car and have a better understanding of how it behaves. Preference was a set up more suitable for A/B roads rather than fast road/track, so ride heights, arbs and geo tuned accordingly. Now that I've had it on familiar roads, just as as Chris said it would, the car is better able to "breathe" across less than perfect roads, the DSC module is helping too I guess Thumb


I waws up with Chris last Thursday to have my fron shocks overhauled. He mentioned to me about getting a DSC box to make it a bit softer/complient on our roads. How do you find the DCS box on your GT3.
Regards
Darren
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MJA911
Magny-Cours


Joined: 10 Dec 2013
Posts: 2657
Location: Berkshire

2012 Porsche 991 Carrera

PostPosted: Fri Mar 02, 2018 1:04 pm    Post subject: Reply with quote

It feels less brittle/more supple in normal driving, but when pushing on it's feels flatter and grippier, with less bounce because the DSC makes the dampers harden and soften more quickly in reaction to the cornering, braking and acceleration forces.

I have to qualify this as being all due to the DSC as my car is now set to have less tension in it mechanically, ride heights are at the top of OEM and the ARBs are set soft, with Chris saying this all makes helps the chassis to breathe. When I track the car, I have their suggestion for what holes to put the arbs in and can use the firm setting on the PASM.
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991 C2 PDK, 986 Boxster S
Past pleasures: 997.1 GT3, 997.2 C4S Cab, 993 C2, 997.1 C2S, 996.1 C4
 
  
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ragpicker
Estoril


Joined: 14 Apr 2013
Posts: 3585
Location: North East England


PostPosted: Fri Mar 02, 2018 1:10 pm    Post subject: Reply with quote

My, what clean wheel arches you have Salut
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986 S - usually in pieces: http://911uk.com/viewtopic.php?t=112626
 
  
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MJA911
Magny-Cours


Joined: 10 Dec 2013
Posts: 2657
Location: Berkshire

2012 Porsche 991 Carrera

PostPosted: Fri Mar 02, 2018 1:11 pm    Post subject: Reply with quote

Full set of undertrays too @ragpicker Very Happy
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991 C2 PDK, 986 Boxster S
Past pleasures: 997.1 GT3, 997.2 C4S Cab, 993 C2, 997.1 C2S, 996.1 C4
 
  
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ragpicker
Estoril


Joined: 14 Apr 2013
Posts: 3585
Location: North East England


PostPosted: Fri Mar 02, 2018 1:13 pm    Post subject: Reply with quote

MJA911 wrote:
Full set of undertrays too @ragpicker Very Happy


Damn
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evodarren
Spa-Francorchamps


Joined: 12 Nov 2008
Posts: 293
Location: Southend on sea


PostPosted: Fri Mar 02, 2018 2:39 pm    Post subject: Reply with quote

MJA911 wrote:
It feels less brittle/more supple in normal driving, but when pushing on it's feels flatter and grippier, with less bounce because the DSC makes the dampers harden and soften more quickly in reaction to the cornering, braking and acceleration forces.

I have to qualify this as being all due to the DSC as my car is now set to have less tension in it mechanically, ride heights are at the top of OEM and the ARBs are set soft, with Chris saying this all makes helps the chassis to breathe. When I track the car, I have their suggestion for what holes to put the arbs in and can use the firm setting on the PASM.


Chris raised my ride height and softened the Arb,s
From stock I had 5mm travel before bump stopsat the rear
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