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Old 03-05-2015, 03:06 PM
  #6376  
ToyGuyAZ
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If anyone thinks the 991 GT3 will be quicker in gears 1-4 or any gear you are crazy. All these "speculations" are comedy.
Old 03-05-2015, 03:09 PM
  #6377  
SamFromTX
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Originally Posted by ToyGuyAZ
If anyone thinks the 991 GT3 will be quicker in gears 1-4 or any gear you are crazy. All these "speculations" are comedy.
I am afraid you may be right. Five seconds at the ring is very little and if downforce is really big as they claim, then speed difference may not be of any significance.
Old 03-05-2015, 03:12 PM
  #6378  
Mike in CA
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Thanks for posting those specs, Macca! The side by side comparisons are very illuminating.
Old 03-05-2015, 03:17 PM
  #6379  
Macca
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Originally Posted by Dan39
Makes perfect sense. The GT3 understeers at low speed and tended to oversteer at high speed - I think it was Macca who jumped down my throat for suggesting this in another thread as the man loves his GT3 and we love him for that! - so they've added grip all round but slightly more biased to mechanical grip at the front to add grip at low speed and downforce at the rear to add grip at high speed.
Dan. You were very strong in your view the GT3 was a big under steerer and over steerer on the track. That's not my experience other than the rear can get a big figgity at high speed under brakes which could be solved by aero. However I don't know many who would agree the car is big on under steer compared to prior generations. Of course aero will always help and you can see the work already done here by Lane and Spartan on their GT3. Also running Hoosiers and trail blazing. Aero is relatively easy and cheap to address at the rear of GT3 with a wing and a few vendors stepping up now which is great and cost very reasonable too - the 10 mins revert to stock wing for street. Possibly wider tyres on front and rear could help mech grip on GT3 too. Sorry if I came across too strong before. I love my GT3 yes and I hope also my GT4 when I finally get it - the RS is not for me - but don't get me wrong it's the best GT car in the range and s more capable machine than GT3 I am sure. I would love one next to my GT3 to use at the track but Iam not that rich!!!
Old 03-05-2015, 03:52 PM
  #6380  
tcsracing1
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Originally Posted by jumpstone
Yes thats what i thought! Battery ans pccb - minus 30kg! But still i know a lot of people that hate pccb! I always had it and i love it! But there are sooo many people dont like it! Maybe cause they are more expensive at first and later compared to the stee red ones! Does anybody has experience with pccb on a gt3rs while racing? Is it worth it!? I had quiet a lot of people didnt want to buy my former used cars cause of pccb
GT3DE races his .2GT3 with PCCB and is happy with them. Really, really races.

Most folks swayed away from PCCB because they were afraid to eat them at the track.
Unless you plan on running 100 hours a season on the track like a cup car, go for the PCCB.
Old 03-05-2015, 04:11 PM
  #6381  
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i can't believe all that extra grip/df and improved engine (4.0, ram air, tit rods etc..) = only 5s at the ring
...... maybe 5 sec by flugplatz
Old 03-05-2015, 04:23 PM
  #6382  
GreenLantern
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Folks, remember, the 'Ring has been a bucket of snow the past few months...

The 991 GT3 RS is not 7:20 at the 'Ring. It's expected, by Porsche (and AP), to be 7:20, and we all know Porsche to always under-promise on numbers (hp, 0-60 times, lap times). Wait for the snow to melt, and we'll hopefully eventually get a 'Ring video.

Same goes for the 7:40 for the 981 Cayman GT4.

Patience.
Old 03-05-2015, 04:23 PM
  #6383  
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Originally Posted by Macca
Thanks Peter. Agree with what you say. Cant imagine it would be difficult to drop the car 5-10mm.

Jon70. I think you are onto something there and why the car looks taller than the GT3. The side-walls are taller.
Anyone think part of the reason for the higher sidewall is so the car will less uncomfortable to drive on the street?
Old 03-05-2015, 04:26 PM
  #6384  
GreenLantern
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You can't test the 991 GT3 RS or 981 GT4 here:


Old 03-05-2015, 04:27 PM
  #6385  
Macca
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I think rig time will drop before press drives in April/may!

Side wall for strength due to elevated down pressure at Vmax

Someone needs to make some R comp 20/21" tyres choices (preferably reasonable price) like NT01 etc very soon please for GT3/RS/GT4 owners...please
Old 03-05-2015, 04:29 PM
  #6386  
Bill Verburg
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Originally Posted by ToyGuyAZ
If anyone thinks the 991 GT3 will be quicker in gears 1-4 or any gear you are crazy. All these "speculations" are comedy.
You are certainly welcome to have faith in whatever religion floats you boat but I believe in Math and Science
These are models and as such aren't perfect but are based on the known facts and laws of Physics
here's one input


another
weight
GT3 3195# 3395# w/ 200# driver
GT3RS 3125# 3325# w/ 200# driver

another
aero Cd S(aka frontal area)
GT3 .33 2.036
GT3RS .34 2.144

another


If you have better data lets discuss it, otherwise....Worship at whatever altar you choose

Last edited by Bill Verburg; 03-05-2015 at 06:35 PM. Reason: error correction
Old 03-05-2015, 04:33 PM
  #6387  
Macca
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Originally Posted by GreenLantern
Folks, remember, the 'Ring has been a bucket of snow the past few months... The 991 GT3 RS is not 7:20 at the 'Ring. It's expected, by Porsche (and AP), to be 7:20, and we all know Porsche to always under-promise on numbers (hp, 0-60 times, lap times). Wait for the snow to melt, and we'll hopefully eventually get a 'Ring video. Same goes for the 7:40 for the 981 Cayman GT4. Patience.
Agreed mate. I'm expecting early 7.38 for Gt4 and mid 7.18 for GT3RS. PAG already have simulated what the can do I'm sure...
Old 03-05-2015, 04:35 PM
  #6388  
Macca
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Bill love your work as always. Yourself and Petevb teach me so much!
Old 03-05-2015, 04:36 PM
  #6389  
rockitman
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Originally Posted by Bill Verburg
You are certainly welcome to have faith in whatever religion floats you boat but I believe in Math and Science
These are models and as such aren't perfect but are based on the known facts and laws of Physics
here's one input


another
weight
GT3 3195# 3395# w/ 200# driver
GT3RS 3125# 3325# w/ 200# driver

another
aero Cd S(aka frontal area)
GT3 .33 2.036
GT3RS .34 2.144

another


If you have better data lets discuss it, otherwise....Worship at whatever altar you choose
Looks like a compelling case to me. Thanks for that.
Old 03-05-2015, 04:47 PM
  #6390  
ToyGuyAZ
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Porsche has already posted figures for acceleration on both cars to 60, 62 and 124mph. The RS is quicker than the GT3 to every mph, as it should be and as it will be. I don't need to preach at any alter. I'll just enjoy the real world in my 15 GT3 and add the RS when it arrives later this year. They tested the RS at 10.9sec to 124mph, the GT3 was 11.4sec to 124mph (other tests have shown the GT3 is quicker than Porsche states as will be the case with the RS). That's a significant difference and already disproves your math and science saying the GT3 would be quicker in gears 1-4 and maybe all gears.


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