When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I dont care much for drag racing but there seems to be a big discrepancy between various tests conducted. The lightweight package TTS clocked 9.9s@139, before another test did it 10.1s@135. These are so different that you’d need an extra 80-100 hp to gain 4 mph/0.2s and the loss of 66 lbs definitely do not account for this.
Which is why I wanted to ask what do owners of these cars in real life observe?
I just got past 1800 miles and took the Dragy out for a test drive. The roads in Mexico are crowned and have a slippery, bumpy surface. But it was only 73 degrees so had that working for me. The car is completely stock as it came from the factory including the Goodyear tires at 30/34psi. I am not a drag racer so I am sure this could be optimized by someone who knew what they doing, but felt it was pretty close to what I expected from the car. How it performs at Sebring next month will be the test.
C&D correct their results for DA, and IMO that could be part of the culprit here. Modern turbocharged engines can compensate to some extent for unfavourable DA by adjusting boost. Correcting for DA when conditions are less favourable could make the car artificially fast.
I am not as concerned about 9.9 vs 10.1 as I am concerned about the 4-5 mph trap speed difference. DA won't really account for that, that is a massive spread. It takes over 100 hp to go from 130 to 135 mph and the faster you go the need for more horsepower isnt linear. So to go from 134-135 to 140 is pretty massive. I dont see both being possible in the same car without some major changes in tune, gasoline used, tires, etc.
"By the time 100 mph whizzed by, the 2021 Porsche 911 Turbo S Lightweight was 0.4-second ahead at 5.2 seconds. Crossing the finish line of the quarter mile, the standard car made the trip in 10.3 seconds at 132.3 mph to the Lightweight's 10.0-second, 137.8-mph best."
They “correct “ for ET and MPH. Sales magazines. Real world reasonable results are in the dragy above. DA could move that number slightly up or down , but as mentioned above, the DME is very smart now and compensates.
Wouldnt the ET correction be apples to apples though because its the same magazine, same instruments, same method and correction?
I looked at the first motor trend article that clocked the turbo s at slower trap speed and that car has sports package. Would it be possible that sport package wing and splitter introduces more drag hence slowing the trap speed? The same is true for 135 vs 139 for when Matt Farah reviewed and documented the trap speeds. His car was the same sports package car vs one without but with lightweight package.
Wouldnt the ET correction be apples to apples though because its the same magazine, same instruments, same method and correction?
I looked at the first motor trend article that clocked the turbo s at slower trap speed and that car has sports package. Would it be possible that sport package wing and splitter introduces more drag hence slowing the trap speed? The same is true for 135 vs 139 for when Matt Farah reviewed and documented the trap speeds. His car was the same sports package car vs one without but with lightweight package.
The applied DA correction factor would be different if the cars are tested in different DA conditions.
Since modern turbocharged cars can to some extent compensate poor poor DA conditions, DA correction factor can artificially skew the results. Good point about the sports package adding some drag though.
The applied DA correction factor would be different if the cars are tested in different DA conditions.
Since modern turbocharged cars can to some extent compensate poor poor DA conditions, DA correction factor can artificially skew the results. Good point about the sports package adding some drag though.
Exactly.
90F day 5500ft DA car ran 10.4 133. actual corrected to 9.9 139
50F day 2000ft DA car ran 10.3 at 134 actual corrected to 10.1 135
Absolutely, depending on the Coefficient of Drag changes. A GT2RS Wing probability costs 1-2 mph in the 1/4, etc.
Obviously not the same car but a ZR1 without the wing went 5 mph faster (142 vs 147). I think the faster you are, the aero drag impacts you more at a higher rate (i.e its not a linear difference).
08-21-2022, 11:09 AM
What is the stock 1/4 mile time?
