AutoZeitung 991 GT3 vs Turbo S test
11-13-2013, 10:07 AM
#46
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These Dunlops have a treadwear rating of 80 and I believe are considered to be R-comps. I've used them on a Cayman and 997 and, at their best, found the grip comparable to R888s, not quite as good as NT01s. But I haven't found the Dunlops to be a 'real' track tire, because they're prone to getting overheated, at which point the grip falls way off and they can disintegrate (I corded about a half dozen of them at inside or outside edges), and they feel floppy when tire pressures are low (sidewalls not stiff enough?), so the sweet spot is only a few good laps per session. Nice street tire though (quiet, feels grippy and precise, fine in the rain), and probably good for occasional track days at beginner or intermediate level.
11-13-2013, 10:14 AM
#47
An acquaintance tests and tunes for one of the big three. As part of his program he tested summer tires a few years ago, roughly 265 through 305. One of the surprising things he found was that in PS2s, the 265 (OE BMW M3) was significantly sticker than the 285 (OE BMW M5). Michelin had used different compounds and constructions for each to suit the manufacturer's requirements.
Competition to land an OE tire contract like the Turbo S is pretty hot, and tire manufactures are going to produce whatever the Porsche wants, regardless of what it says on the tin, using the latest compounds and construction. Not four year old Corsa tech. Thus it's hard to know what they decided to go with in this case, but sweeper cornering speeds were significantly lower than the GT3, suggesting they are significantly less sticky than the MPSC2 at least.
Sam, you might throw a set of those on- they should work pretty well on the TS, as they were designed with similar weights, etc in mind. They'd likely match the car better than the Trofeo.
Competition to land an OE tire contract like the Turbo S is pretty hot, and tire manufactures are going to produce whatever the Porsche wants, regardless of what it says on the tin, using the latest compounds and construction. Not four year old Corsa tech. Thus it's hard to know what they decided to go with in this case, but sweeper cornering speeds were significantly lower than the GT3, suggesting they are significantly less sticky than the MPSC2 at least.
Sam, you might throw a set of those on- they should work pretty well on the TS, as they were designed with similar weights, etc in mind. They'd likely match the car better than the Trofeo.
11-13-2013, 04:55 PM
#48
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Saw a Turbo S in the showroom today. Looks pretty menacing. But $190K sticker, yikes! 
11-14-2013, 12:51 AM
#49
Burning Brakes
Maybe I'm confused by the way it's worded, but I read the Porsche description as just the opposite: up to 3 degrees above 50mph and 1.5 degrees below 30. Am I wrong?
Thanks to the new rear-axle steering which is fitted as standard, everyday practicability and performance have both been equally increased. The system consists of two electromechanical actuators fitted on the rear axle instead of the conventional tie rod. It therefore steers the rear wheels of the new 911 Turbo models from +3 to –1.5 degrees in the same or opposite direction as the steering angle on the front axle, depending on speed.
Thanks to the new rear-axle steering which is fitted as standard, everyday practicability and performance have both been equally increased. The system consists of two electromechanical actuators fitted on the rear axle instead of the conventional tie rod. It therefore steers the rear wheels of the new 911 Turbo models from +3 to –1.5 degrees in the same or opposite direction as the steering angle on the front axle, depending on speed.
"Below 31 MPH, the rear wheels turn as much as 2.8 degrees opposite the fronts. This shrinks the car's turning circle to just 34.8 feet, 1.6 feet tighter than a VW Golf. Between 31 MPH and 50 MPH, rear steering enjoys the scenery,
but above that the rear wheels turn the same direction as the front. At that point, they can shift up to 1.8 degrees, creating a crabbing effect that makes lane changes extremely efficient"
11-14-2013, 02:13 AM
#50
Race Director
Panorama, Issue 679, Pg 47 has a far clearer description of Turbo RWS:
"Below 31 MPH, the rear wheels turn as much as 2.8 degrees opposite the fronts. This shrinks the car's turning circle to just 34.8 feet, 1.6 feet tighter than a VW Golf. Between 31 MPH and 50 MPH, rear steering enjoys the scenery,
but above that the rear wheels turn the same direction as the front. At that point, they can shift up to 1.8 degrees, creating a crabbing effect that makes lane changes extremely efficient"
"Below 31 MPH, the rear wheels turn as much as 2.8 degrees opposite the fronts. This shrinks the car's turning circle to just 34.8 feet, 1.6 feet tighter than a VW Golf. Between 31 MPH and 50 MPH, rear steering enjoys the scenery,
but above that the rear wheels turn the same direction as the front. At that point, they can shift up to 1.8 degrees, creating a crabbing effect that makes lane changes extremely efficient"
11-14-2013, 11:21 AM
#51
Burning Brakes
11-20-2013, 12:12 PM
#52
Rennlist Member
IMO, doing these comparisons without using identical tires (regardless of the tires the car ships with) doesn't make sense. Tires make a big difference in both objective performance and subjective feel of the car. I've run my 997.1 C2S with the Dunlop SM Race tires and Super Sport street tires. The Dunlops make the car significantly more enjoyable on the road, and will surely put down a better lap time than the Super Sports.
11-20-2013, 12:29 PM
#53
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Yes, but tires make a substantial difference, are easily changed, and don't last long when used on the track anyway. So if you really want to compare the cars, you need to standardize everything else - tires, driver, track, track condition, etc.
