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Old 15-03-2016, 11:08 PM   #1
TfR Spiny Anteater
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Ruf CTR (Yellowbird)

...or Orangebird in the case of the one I drove

What can I say about this car? It has a high power to grip ratio. You steer it with the throttle sliding the back end around corners, which heats up the rears more than is ideal, although not so far that they overheat fully. The brakes overheat and will need looking after, even with the duct fully open. And as would be expected from an old 911, you need to use maintenance throttle into the corners or it will bite you. It has all the makings of being an awful drive... and I love it Enormous fun once you get the hand of it, who cares if it's not as fast as the McLaren F1's which are in the same class.

This tune is for Zolder which isn't the natural hunting ground for the CTR. Things to be aware of: the brakes will get hot and you may well notice a bit of fade. The rear tyres will also be warmer than ideal unless you're careful - it didn't work adding pressure as the rear slid around more and so the car was slower and still had hot rears. If the temperature really bothers you, you can switch to mediums, but expect to lose about 1.5 seconds/lap. Finally, beware of the fuel estimation as it's very optimistic - budget around one extra lap on the estimation for every 5 laps you're running

And now, the Zolder tune:

Tyres & Brakes
Tyre Compound: Soft
Front Tyre Pressure: 1.89 Bar
Rear Tyre Pressure: 2.11 Bar
Brake Pressure: 100%
Brake Balance: 64%
Brake Duct: 100%
Traction Control Slip: 15%

Alignment
Steering Ratio: 15.9:1
Caster: 4.5 deg
Front Camber: -2.2 deg
Rear Camber: -1.9 deg
Front Toe-in: -0.1 deg
Rear Toe-in: +0.1 deg

Suspension
Front Ride Height: 145mm
Rear Ride Height: 150mm
Front Spring Rate: 78 N/mm
Rear Spring Rate: 105 N/mm
Front Sway Bar: 45 N/mm
Rear Sway Bar: 20 N/mm

Dampers
Front Slow Bump: 4200 N/m/s
Rear Slow Bump: 4600 N/m/s
Front Slow Rebound: 5500 N/m/s
Rear Slow Rebound: 11,000 N/m/s

Differential
Accel: 33%
Decel: 27%
Preload: 60 N-m

Gearing
Final Drive: 4.00
1st: 2.78
2nd: 1.60
3rd: 1.17
4th: 0.86
5th: 0.64

Engine
Fuel Load: 17l
Qually Load: 21l
Wastegate Pressure: 2.25 Bar
Brake Mapping: 4
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Old 22-03-2016, 10:27 PM   #2
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Unfortunately, the tune above didn't work quite so well at Oulton Park Island as it got quite unsettled in the Turn 2 and 3 combination. As a result, I've tweaked it, but be warned that the brakes take a bit of a hammering around here and will be hot and fading after a few laps, particularly coming into the back straight chicane, so be prepared to brake a bit earlier than expected.

Other than that though, it's quite a useable tune. The car has lots of straight line performance, and once you get the hang of the way it takes the corners it's quite competitive.

Changes from Zolder are in bold

Tyres & Brakes
Tyre Compound: Soft
Front Tyre Pressure: 2.00 Bar
Rear Tyre Pressure: 2.14 Bar
Brake Pressure: 93%
Brake Balance: 65%
Brake Duct: 100%
Traction Control Slip: 15%

Alignment
Steering Ratio: 15.9:1
Caster: 4.5 deg
Front Camber: -2.2 deg
Rear Camber: -1.2 deg
Front Toe-in: -0.1 deg
Rear Toe-in: +0.1 deg

Suspension
Front Ride Height: 140mm
Rear Ride Height: 145mm
Front Spring Rate: 87N/mm
Rear Spring Rate: 113 N/mm
Front Sway Bar: 45 N/mm
Rear Sway Bar: 10 N/mm

Dampers
Front Slow Bump: 4200 N/m/s
Rear Slow Bump: 4600 N/m/s
Front Slow Rebound: 5500 N/m/s
Rear Slow Rebound: 9000 N/m/s

Differential
Accel: 33%
Decel: 43%
Preload: 60 N-m

Gearing
Final Drive: 4.00
1st: 2.78
2nd: 1.60
3rd: 1.17
4th: 0.86
5th: 0.64

Engine
Fuel Load: 22l
Qually Load: 21l
Wastegate Pressure: 2.25 Bar
Brake Mapping: 4
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