Hi there


I've got a 997.1 Carrera S with PASM, PCCB etc. I've done several track days now and got used to driving the car at its limits and on track understeer is very prone, I've done an allignment but could only manage -1 degrees on stock setup, as such would the following mods work:-

1. Do the 997.1 GT3 front and rear swaybars fit? Do I just need the swaybars or are other parts required? Are the stock Carrera S swaybars adjustable?
2. GT3's have 5mm spacers fitted stock to give a wider track, can I do the same on a Carrera S and fit 5mm spacers all round for a wider track also or should & can I go even wider?
3. GT3 lower control arms for more negative front camber!

Has anyone done it hear, how did it change the car and I believe the GT3 bars are adjustable so which settings did you find best for mainly street and a little track?
What about spacers, anyone done this, did they effect handling in a positive way, what did you go with?

Also lower control arms to get more front camber, will the 996 GT3 parts fit on a 997.1 or does only the 997.1 GT3 ones fit?

 

Check your tire pressures before incurring the additional expense

 

Yeah done the experimenting with front and rear pressure. I've found 34psi front and 39psi cold gave me best results and on track events hot keeping the fronts around 36-38psi hot and the rears around 40psi hot yielded best results.

So now my car is in need of suspension upgrades for me to go faster.

 

Lots of vendors have sway bars and arms for the .1S. Check out the ones in my signature. I bought the H&R's from VividRacing (3 way adjustable) and the LCA's directly from the maker. Happy with both.... BUT keep in mind the tradeoff. Stiffer sways will affect the ride of the street somewhat and adding camber could prematurely wear your tires for street use.

About a year ago, I was where you are. I wanted a parts solution to a problem that I think may have been solved by just adjusting my driving style. More specifically, try working on your trailbraking. IMO, especially on a 2WD S, you shouldn't have significant oversteer if you are properly trailbraking.

 

get both front and rear gt3 sway bars, suncoast sells front one cheap, tarett sells rear one together with their droplinks. use latest 'thick' stock gt3 bars. there were several versions of then, you need latest one, or so called 'gt2' bars.

in front if you will have lowered car you may need to use custom droplinks too, in rear stock ones will fit, i had tarett there but in 2 years they have developed a tendency to get loose and rattle so i p[laced back stock ones and they work fine. .

 

it depends of a tire, on nt01 and ra1 i keep 34/36 rear front. with big gap of pressures you get too much diff on traction limit, so you want rear to be may be 2.5psi more than front max.

 

Hi there

So at Porsche I need the front and rear swaybars say from a 2010 GT3, would that be new enough, or do you have part numbers?

My car is not lowered, it is stock PASM suspension as found on a Carrera S.

So for back I just buy latest GT3/GT2 rear swaybar, no need for drop links.

Front shall wait for your input.

I've just gone with some 7mm front spacers and 5mm for the rear too, as being told it will help a little with overall grip and marginally reduce understeer.

 

I do not have part numbers now but 2010 gt3 sways are what you want.
My stock front droplinks were modified by my indy - cut and welded back with an additional rod to make them firmer.

 

Excellent so for the rear I just need the sway bar and the front need drop links too unless willing to mod. MY current ones.


Did you find the GT3 bars gave you more overall grip so higher corner speeds, are they lighter than stock bars too?

 

I found -1 camber upfront and wider front tires (245) took care of a lot of the understeer.
I have since gone to GT3 lower control arms and -2.2 camber + H&R antisway bars. Now I have no understeer.

 

did you find that the GT3 sway bars helped control "lean" in high speed corners?

 

Absolutely. That's what they are designed to do.

 

+1 on checking the tire pressures first... Just a FYI, only 1-2 lbs of pressure coming from heat in the rear seems very low to me... But it all depends on track temp, ambient temp and measurement so YMMV. If understeering, try lowering front pressure some more.

+1 on fixing alignment second. Those GT3 LCA's with some camber F/R will pay off big time for fixing understeer.

I also played with track width and ended up with 5mm in the front and no spacers in the rear. That is probably the least perceptible change I made (sometimes it is all between the ears)... BTW, I am currently running 245/305 or 255/315 rubber.

I also have sway bars but went with RSS and they work OK at middle front and stiff in the rear. In hindsight, I should have gone OE with GT3/GT2 units - they have more adjustability.

I also bought RSS adjustable drop links but they were noisy. I just came to the conclusion that a Heim joint just wasn't the right fit for this application as the joint becomes binding when the suspension is at full travel. I guess it works fine on a cup car because their suspension is so tight but on a street car, it just did not work out so great.

I recently bought Powergrid droplinks and, after about 16 hours of track time, they are behaving quite well.

HTH,

T.

P.S.: I you get bigger sway bars (i.e. GT2/3), you will also need to get the rubber bushings that go with them if you want them to seat properly.