Any Rennlisters from New Zealand?
05-04-2015, 09:55 PM
05-04-2015, 09:58 PM
Intermediate
Join Date: Feb 2015
Location: Auckland NZ
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I bought the Gembella equipped 964 from that guy , difficult to deal with , backed out twice on me , but I had just sold my 356 speedster and wanted another toy quick and his was the only C 2 manual even vaguely for sale - rang all the specialists and they all laughed when I told them I wanted a C2 manual , so I dug up all the old ads and got ringing. Looking at where prices have gone overseas , it was a good buy , have had it out at Hampton and runs strong.
05-04-2015, 10:18 PM
Rennlist Member
I bought the Gembella equipped 964 from that guy , difficult to deal with , backed out twice on me , but I had just sold my 356 speedster and wanted another toy quick and his was the only C 2 manual even vaguely for sale - rang all the specialists and they all laughed when I told them I wanted a C2 manual , so I dug up all the old ads and got ringing. Looking at where prices have gone overseas , it was a good buy , have had it out at Hampton and runs strong.
05-04-2015, 10:21 PM
Rennlist Member
05-04-2015, 10:26 PM
Rennlist Member
For the record, the R has N rated tyres and I put the same on the 996TT and Turbo 3.6 so I see some value in it. Others opinions differ. I'm equally happy with the Hankooks on Herman and ecstatic about the Z221 which are very good at their intended use.
05-04-2015, 10:49 PM
Burning Brakes
Join Date: Feb 2014
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05-04-2015, 10:56 PM
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05-05-2015, 12:09 AM
Drifting
Matt's P1 is about the only car around here running enough aero to potentially impact tyre construction, the odd race or hillclimb special aside perhaps.
For example, at 200kph, Sport Auto using the Daimler wind tunnel at Stuttgart University were reportedly the only ones in the world other than Porsche to test lift and downforce and CDxA. For the 911 for instance they found a while back that net lift is close to zero for the GT3RS (and for the TT):
GT3RS
Front: - 19kgs
Rear: 25kgs
Net: 6kgs of downforce
996TT:
Front: - 7Kgs
Rear: 6kgs
Net: -1kgs lift
Most cars generate front axle aero lift instead but still the figures are peanuts compared to the 400-800 odd kgs of mass on those axles. And especially at normal road speeds.
The rake changing as the car pitches on braking and acceleration would probably have a bigger effect but I can't find figures for that. Different when you get to GT3 Cups running 7 degrees of wing of course but that's outside the N-rating discussion.
When talking tyre contruction, the 911 and cayman weight distributions are both still heavily rear weighted compared to the vast majority of cars out there, ie the front engined, FWD cars that most stock non-manufacturer rated tyres are designed for.
Toyota Camry F/R is 60:40
compared to:
911 996T 38:62
Cayman 46:54
BMW 540i (e39) 53:47
More here about how that and how the balance changes dynamically under braking and acceleration: http://www.caranddriver.com/features...11-gt3-feature
Yes, the tread compounds may sometimes vary I suppose, but I've only ever come across the construction varying in articles I've come across over the years. Construction can measurably change performance though.
Newer tyres are typically faster (though the Bridgestone S02s are still missed). This is seldom given credit when comparing performance figures and 'Ring times between generations.
I'd agree with that, though german Fuldas also rocked on my 750iL and were spectacular value for money.
For example, at 200kph, Sport Auto using the Daimler wind tunnel at Stuttgart University were reportedly the only ones in the world other than Porsche to test lift and downforce and CDxA. For the 911 for instance they found a while back that net lift is close to zero for the GT3RS (and for the TT):
GT3RS
Front: - 19kgs
Rear: 25kgs
Net: 6kgs of downforce
996TT:
Front: - 7Kgs
Rear: 6kgs
Net: -1kgs lift
Most cars generate front axle aero lift instead but still the figures are peanuts compared to the 400-800 odd kgs of mass on those axles. And especially at normal road speeds.
The rake changing as the car pitches on braking and acceleration would probably have a bigger effect but I can't find figures for that. Different when you get to GT3 Cups running 7 degrees of wing of course but that's outside the N-rating discussion.
When talking tyre contruction, the 911 and cayman weight distributions are both still heavily rear weighted compared to the vast majority of cars out there, ie the front engined, FWD cars that most stock non-manufacturer rated tyres are designed for.
Toyota Camry F/R is 60:40
compared to:
911 996T 38:62
Cayman 46:54
BMW 540i (e39) 53:47
More here about how that and how the balance changes dynamically under braking and acceleration: http://www.caranddriver.com/features...11-gt3-feature
Yes, the tread compounds may sometimes vary I suppose, but I've only ever come across the construction varying in articles I've come across over the years. Construction can measurably change performance though.
Newer tyres are typically faster (though the Bridgestone S02s are still missed). This is seldom given credit when comparing performance figures and 'Ring times between generations.
I'd agree with that, though german Fuldas also rocked on my 750iL and were spectacular value for money.
05-05-2015, 12:17 AM
05-05-2015, 01:14 AM
Rennlist Member
Walt Im not an engineer but the downforce on the new 991 GT3 and 981 GT4 is around 180lb rear and perhaps half of that at the front. If you look you will see the sidewall rating has increased for N rated tyres for those models over the Carrera S with 20" equivalent OEM wheels/tyres option. Additionally 991 GT3RS is now at 300lb rear down-force and front has increased too. The rear/front tyre wall stiffness has agin increased over 991 GT3/GT4 for the OEM Michelin N rated tyre the car ships on. All this is from memory so I cant quote down to the lb but at 200kmph rating PAG have found it necessary to increase sidewall stiffness of base model with same size tyre (assumes also similar weight and F/R weight bias). So aero is definitely a real component in the equation particularity for the newer performance models now that PAG are focusing on this aspect of their car design to ever lift the bar.
Adrian Streather was a bit miserable for the free book. 12 of my pictures and input to three chapters in the 993 Companion and apart from credits as significant contributor at the front I still paid full retail and shipping for the book too John :-)
Adrian Streather was a bit miserable for the free book. 12 of my pictures and input to three chapters in the 993 Companion and apart from credits as significant contributor at the front I still paid full retail and shipping for the book too John :-)
05-05-2015, 01:19 AM
Rennlist Member
PS interesting data point on the Fulda Walter. Thats not a brand I hear much about.
One other interesting observation is the European tyres seem to almost always be lighter (carcass) and quieter than the Asian equivalent.
One other interesting observation is the European tyres seem to almost always be lighter (carcass) and quieter than the Asian equivalent.
05-05-2015, 01:45 AM
Rennlist Member
You were far worse done by than me. He was a polarizing figure at the time. Quite opinionated.
05-05-2015, 02:05 AM
Rennlist Member
05-05-2015, 02:28 AM
Rennlist Member
He had a C4. Around the time of the book he had a personal tragedy with his Daughter which appeared to put things on the back burner but he went on to write a series of books.