.2 GT3RS vs .2GT3 Who wins in a roll race?
#76
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Aero Drag is a much bigger deal than HP at high speed. Mathematically, it's a Cube function. So to go 2 times faster with a given amount of drag, you need 8 times as much HP...
I know Trakcar says at the faster tracks, the .1 GT3 would beat him on the straights with his .1 RS (when the RS was rated 25hp and 4% torque higher), because of the extra aero drag...
#77
Could it be the PCCB's on the RS vs. Iron brakes on the GT3?
Do we know if that's worth any difference on a pull between to similar GT3's with different brakes?
Do we know if that's worth any difference on a pull between to similar GT3's with different brakes?
#78
In theory you're correct, but since you have no data to back up your claim (sorry if I missed it) it's nothing more than speculation. What does noticeably higher mean? 5%? 10% 25%? Is the e-diff fluid pressure always the same, or is it less in a straight line after launching? You very well may be right, I'm just not sure there is enough data to support your "significant" claim.
#79
Race Director
Grant we need to go to Bandimere. .1 vs .2 GT3. PDK vs Manual. Let me know when you are game and we will get some video. If I get flogged, that is fine. Love the car regardless!
#80
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I'm very sceptical on the parasitic losses on the PDK, until i see some comparable dyno figures taken at the same time in identical conditions..I'm guessing its no more than 1-2% which makes sense as there's only a 1mph higher top speed with the 37lbs lighter manual.People seem to compare a PDK with an auto.A PDK is a manual box with a computer operated twin clutch connecting to the engine..A proper torque converter auto has no clutch and no direct mechanical connection between gearbox and engine..
#81
This should account for some of the difference although only minimal..The PCCB has 37lbs less rotational mass on the wheels.Since all the power is transferred to the wheels directly and its the wheels that take the car with it, then reduced rotational mass to twist has to make a slight difference..
#82
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#84
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You'll beat us both
Might be interesting to compare speeds at end of straight at HPR. My best so far is indicated 140mph (137 on Harry's GPS lap timer). Not a perfect test (if not same entry speed and braking point), but still interesting.
Speed is higher than 1/4 mile at Bandimere, so you start to see influence of aero a bit more.
Might be interesting to compare speeds at end of straight at HPR. My best so far is indicated 140mph (137 on Harry's GPS lap timer). Not a perfect test (if not same entry speed and braking point), but still interesting.
Speed is higher than 1/4 mile at Bandimere, so you start to see influence of aero a bit more.
#85
Three Wheelin'
The gt4 would touch 135 on the dash with Dundon headers/iPD plenum/cobb/Akrapovic system. Not a car we are talking about- but it woke up a bit with some mods. Stock it was close to 130.
#86
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I had RE10 brake pads and Endless fluid on my GT4 which gave me the confidence to brake later in the GT4 - just stock brakes on GT3 so far...
#87
Race Director
#88
Three Wheelin'
It looks like it has around 20-30 rwhp more vs 20 crank hp advantage for the RS as Porsche states. Would love to see a .2 pdk gt3 run agaisnt a .2 manual gt3. What were the speeds? 50-150? Thanks for the vids.
#89
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If the GT3 is under-rated and if the RS makes 30hp crank more (let's estimate 540hp crank or more), then they are really pumping out lots of hp per litre (more than reigning champ, 458 Speciale which has advantage of smaller cylinders)
#90
I don't know if this is a helpful datapoint in this discussion or not, but here is my GT2RS vs a 2010 Honda Odyssey Ex. The driver is a friend of mine and was inexperienced with both racing odysseys and launching a GT2RS. I think he got nervous and missed the first shift - he wasn't used to how quickly it hit redline but GT2RS still eeked out the win. One important note - the odyssey had steel brakes and the GT2RS has PCCB.
https://youtu.be/b0z8erabot0
https://youtu.be/b0z8erabot0