GTR's don't like hot weather!
04-13-2009, 03:46 PM
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Racer
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GTR's don't like hot weather!
just came back from two days at the track, one of which was spent testing a GTR. conditions were awful on both days-- about 99-100 degrees, and also extremely humid.
car was silly fast and set some really quick times, but that's not the point.
i was shocked to find that in a straightline, it was no quicker than a 997.2 PDK. this was obvious during the sessions when the GTR would be right on the 997's tail entering the main straight; in fact the GTR was in its slipstream, but was unable to even pull level with the Porsche (you'll see an instance of this in the video below).
GPS confirms that the GTR seemed down on power, as comparing the acceleration data with a stock 997GT3 run the previous day, showed the GT3 was actually faster down the straight than the Nissan.
the GTR runs great in all other respects, so it must be the combination of our extreme temperature and humidity (it is summer here now) and our substandard fuel (dyno whp's consistently much lower here than what one sees in the US or Europe) that causes the ECU to dial things back.
am not knocking the Nissan, i still think its an awesome achievement. but we were all quite surprised at its inability to just overhaul the Porsche. then again, heat and turbo's are never a good combination...
here's a short video of a fun day:
http://www.viddler.com/explore/hesperus/videos/2
to emphasize my point on the GTR being really affected by the heat, see this GPS animation of the Nissan vs a 100% stock 996TT. don't mind how they did in the corners, just notice the difference in straightline acceleration. note that the 996TT run was done on another day, which I don't recall being quite as hot / humid, so not quite an apples-to-apples comparo. FWIW anyway...
http://www.youtube.com/watch?v=L9xn3DFeqFI
car was silly fast and set some really quick times, but that's not the point.
i was shocked to find that in a straightline, it was no quicker than a 997.2 PDK. this was obvious during the sessions when the GTR would be right on the 997's tail entering the main straight; in fact the GTR was in its slipstream, but was unable to even pull level with the Porsche (you'll see an instance of this in the video below).
GPS confirms that the GTR seemed down on power, as comparing the acceleration data with a stock 997GT3 run the previous day, showed the GT3 was actually faster down the straight than the Nissan.
the GTR runs great in all other respects, so it must be the combination of our extreme temperature and humidity (it is summer here now) and our substandard fuel (dyno whp's consistently much lower here than what one sees in the US or Europe) that causes the ECU to dial things back.
am not knocking the Nissan, i still think its an awesome achievement. but we were all quite surprised at its inability to just overhaul the Porsche. then again, heat and turbo's are never a good combination...
here's a short video of a fun day:
http://www.viddler.com/explore/hesperus/videos/2
to emphasize my point on the GTR being really affected by the heat, see this GPS animation of the Nissan vs a 100% stock 996TT. don't mind how they did in the corners, just notice the difference in straightline acceleration. note that the 996TT run was done on another day, which I don't recall being quite as hot / humid, so not quite an apples-to-apples comparo. FWIW anyway...
http://www.youtube.com/watch?v=L9xn3DFeqFI
