How to DIY Rear camber adjustment ?
#17
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It sure is interesting the progression of ride heights and rakes that Porsche has done and why they might have done it
2007-2008 GT3
- Front 108mm
- Rear 133mm
- Rake = 25mm
2010-2011 GT3
- Front 102mm
- Rear 137mm
- Rake 35mm
2012 GT3 4.0
- Front 102mm
- Rear 142mm
- Rake 40mm
So, Rake has gone from 25mm to 35mm to 40mm?
I remember a post here a long while ago that showed wind tunnel data from a 2007 gt3 in stock form, and then fitted with a better front lip. They then also lowered the car equally front and rear and then just lifted the rear (i.e. increasing the rake) to see if they could get better aero on the front because in stock form at speed downforce was only produced on the rear but not on the front.
The result was that if you increased the rake by very slightly lifting the rear (i think they went +5mm for a 30mm rake) then more air because of the rake and better splitter created more front downforce and the higher rear also created more rear downforce.
This seems to be what Porsche replicated on the 2010s and then even more so on the 4.0 - i.e. more front downforce / more weight on the front.
The big question is, is this faster on the track? Because there sure seems to be a lot of evidence that dropping the rear to get more grip over the rear tires is the way to go on the track.
discuss
2007-2008 GT3
- Front 108mm
- Rear 133mm
- Rake = 25mm
2010-2011 GT3
- Front 102mm
- Rear 137mm
- Rake 35mm
2012 GT3 4.0
- Front 102mm
- Rear 142mm
- Rake 40mm
So, Rake has gone from 25mm to 35mm to 40mm?
I remember a post here a long while ago that showed wind tunnel data from a 2007 gt3 in stock form, and then fitted with a better front lip. They then also lowered the car equally front and rear and then just lifted the rear (i.e. increasing the rake) to see if they could get better aero on the front because in stock form at speed downforce was only produced on the rear but not on the front.
The result was that if you increased the rake by very slightly lifting the rear (i think they went +5mm for a 30mm rake) then more air because of the rake and better splitter created more front downforce and the higher rear also created more rear downforce.
This seems to be what Porsche replicated on the 2010s and then even more so on the 4.0 - i.e. more front downforce / more weight on the front.
The big question is, is this faster on the track? Because there sure seems to be a lot of evidence that dropping the rear to get more grip over the rear tires is the way to go on the track.
discuss
Last edited by 997gt3north; 12-05-2012 at 03:19 PM.