GT3 downforce specs
03-17-2009, 12:46 AM
#1
Drifting
Thread Starter
GT3 downforce specs
I've never seen this posted before, but came across this very interesting wind tunnel test: http://reverie.ltd.uk/Downloads/ReveriePorscheData.pdf
03-17-2009, 06:45 AM
#3
Addict
Rennlist Member
Rennlist Member
What is awesome for me is just how good the factory set up is. They have managed to keep virtually zero lift at the front all the way up to 186mph - a real achievement...
Looking at the modified numbers the downforce (of the first set up) seems similar to that of the 997 GT2 (as tested by Sport Auto magazine) with around 9kg front and 30kg back at 125mph (roughly reading between the 100mph and 150mph readings)
The GT2 needs every one of its 530hp to punch through the air over 150 mph, in my recent testing going from 190mph to 200mph took 1.6 miles - I have seen road tests of GT3s managing 207mph GPS. Porsche seem to have concentrated on keeping the GT3 as low drag as possible with that awesome balance at all speeds....
Looking at the modified numbers the downforce (of the first set up) seems similar to that of the 997 GT2 (as tested by Sport Auto magazine) with around 9kg front and 30kg back at 125mph (roughly reading between the 100mph and 150mph readings)
The GT2 needs every one of its 530hp to punch through the air over 150 mph, in my recent testing going from 190mph to 200mph took 1.6 miles - I have seen road tests of GT3s managing 207mph GPS. Porsche seem to have concentrated on keeping the GT3 as low drag as possible with that awesome balance at all speeds....
03-17-2009, 11:40 AM
#4
farz,
- the data was posted before but it is great data
- the oakley design front splitter is a nice piece for sure
- what i find the most interesting is that the cup cars, as delivered from the factory, generate front lift (not sure if this is because the rear wing is creating so much downforce that it is lifting the front) but the balance seems better on the street car - but i guess if you are steering the car with the rear wheels, then getting the most grip back there is the key and then just running the front camber at -3.5 with toe-out is how they turn the front of the car
- for us with street cars that see the track ocassionally, raising the rear 2mm and dropping the front by 2mm and getting the oakley front splitter seems like an excellent compromise (assuming it is an easy track side install) OR add the RS wing and increase the rear grip for a cupcar aero setup + dial in lots of front camber
- the data was posted before but it is great data
- the oakley design front splitter is a nice piece for sure
- what i find the most interesting is that the cup cars, as delivered from the factory, generate front lift (not sure if this is because the rear wing is creating so much downforce that it is lifting the front) but the balance seems better on the street car - but i guess if you are steering the car with the rear wheels, then getting the most grip back there is the key and then just running the front camber at -3.5 with toe-out is how they turn the front of the car
- for us with street cars that see the track ocassionally, raising the rear 2mm and dropping the front by 2mm and getting the oakley front splitter seems like an excellent compromise (assuming it is an easy track side install) OR add the RS wing and increase the rear grip for a cupcar aero setup + dial in lots of front camber
