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Apr 23, 2010 8:41:24 AM
- Porsche-Jeck
- Rennteam Master
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- Loc: Rheinland , Germany
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Reply to:
MKSGR
: Porsche 997 GT3 Arctic/Black
Apr 23, 2010 12:43:18 PM
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Gnil
- Rennteam Moderator
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- Loc: VD, Switzerland , Switzerland
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- Reply to: Porsche-Jeck
Re: Supertest GT3 RS
Here are some more numbers:
HHR: 1.09,6
0-100: 4.1s
0-200: 12.7s
200-0: 130.1m (PCCB)
Test weight: 1417kg
Wet handling number is very bad: 1.36,6 (about 7s slower than regular GT3, they say the tires behave differently... which also explains most of the track performance in the dry 
)
Re: Supertest GT3 RS
TB993tt:
MKSGR:Wet handling number is very bad: 1.36,6 (about 7s slower than regular GT3, they say the tires behave differently... which also explains most of the track performance in the dry
Were they cup N1 s ?
Yes 
Front tires are a bit wider in case of the GT3 RS (245) compared to the regular GT3 (235).
Re: Supertest GT3 RS
MKSGR:
TB993tt:
MKSGR:Wet handling number is very bad: 1.36,6 (about 7s slower than regular GT3, they say the tires behave differently... which also explains most of the track performance in the dry
Were they cup N1 s ?
Yes
Front wheels are wider too @ 9" - these are the widths I am on and I have those exact same N1 cup+.........hence I was interested in how they behave "differently" ? differently to what ?
--
2009 997 GT2 659PS/827NM DIN
Re: Supertest GT3 RS
TB993tt:
MKSGR:
TB993tt:
MKSGR:Wet handling number is very bad: 1.36,6 (about 7s slower than regular GT3, they say the tires behave differently... which also explains most of the track performance in the dry
Were they cup N1 s ?
Yes
Front wheels are wider too @ 9" - these are the widths I am on and I have those exact same N1 cup+.........hence I was interested in how they behave "differently" ? differently to what ?
To the best of my knowledge: Increasing front tire width increases tire contact area and decreases front slip angle. Without a corresponding increase in rear tire width, this will reduce understeer, or increase oversteer.
In a 4WD car like the Turbo, reducing understeer is a good thing because a 4WD car tends to neutral- or under-steer. I believe one of the European tuners, Cargraphic (?), does this to its Turbo at the last Tuner Grand Prix. They used wider front tire, while keeping rear tire the same as stock.
In a RWD car like your GT2, the increased oversteer could make the car faster, or slower, or more dangerous ("happy" tail from the oversteer), depending on the GT2's baseline behavior, specific driver, track, situation, etc.
I would also expect wider front tire (non-driven wheel) to affect max speed negatively. How much, I don't know. Hope this helps, or is actually related to your question!
>>>>>>>>>>>>>>>>>>>>>>>>>>>
http://en.wikipedia.org/wiki/Car_handling
| Component | Reduce Under-steer | Reduce Over-steer |
|---|---|---|
| Weight distribution | center of gravity towards rear | center of gravity towards front |
| Front shock absorber | softer | stiffer |
| Rear shock absorber | stiffer | softer |
| Front sway bar | softer | stiffer |
| Rear sway bar | stiffer | softer |
| Front tire selection1 | larger contact area² | smaller contact area |
| Rear tire selection | smaller contact area | larger contact area² |
| Front wheel rim width or diameter | larger² | smaller |
| Rear wheel rim width or diameter | smaller | larger² |
| Front tire pressure | lower pressure | increase pressure |
| Rear tire pressure | increase pressure | lower pressure |
| Front wheel camber | increase negative camber | reduce negative camber |
| Rear wheel camber | reduce negative camber | increase negative camber |
| Rear spoiler | smaller | larger |
| Front height (because these usually affect camber and roll resistance) |
lower front end | raise front end |
| Rear height | raise rear end | lower rear end |
| Front toe in | decrease | increase |
| Rear toe in | decrease | increase |
| 1) Tire contact area can be increased by using wider tires, or tires with fewer grooves in the tread pattern. Of course fewer grooves has the opposite effect in wet weather or other poor road conditions. 2) These also improve road holding, under most conditions. |
--
Regards,
Can
997 Turbo + Bilstein Damptronic "Stage 2" ( Review ) + GIAC ECU Tune ( Fast as a torpedo & reversible to stock - Review ) + Cargraphic Exhaust ( Oh heavenly noise! 
)
Re: Supertest GT3 RS
Thanks Marcus - here are the downforce charts extrapolated for those tested numbers I got the formulae from here:http://www.reverie.ltd.uk/calculate.php
So I am hoping they are correct - the GT3RS total downforce at its maximum speed 310kph calculates as 144.7kg which is down on what Porsche quote (170kg IIRC ?) - maybe the formuals are wrong or maybe it is just a variation in the wind tunnel/testing methods ?
--
2009 997 GT2 659PS/827NM DIN
Jun 22, 2010 8:39:26 PM
- Boxster Coupe GTS
- Rennteam Master
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- Loc: UK , United Kingdom
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- Reply to: vinnie
Re: Supertest GT3 RS
Sport Auto Supertest: 2010 Porsche 911 GT3 RS (results summary)
Sport-Auto-Supertest_2010-Porsche-911-GT3-RS_Rennteam-summary
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