Hi there again! Thanks for the feedback. First off, this calculation here is from the 2022 Porsche 911 GT3, NOT the same as the 2019 Porsche 911 GT3 RS that was on YouTube. You probably confused the two. Second, if you pay close attention to what the "weather conditions" say below the video AND the "testing conditions" on the video itself, the wind direction is not the same — the "weather conditions" say the wind is from the southeast at 3 PM, while on the "testing conditions" on the video itself says the wind is from the southwest! That alone is confusing and not helpful. Anyway, whether southeast or southwest, the runway itself is actually running northwest to southeast based on Google Earth. So, more or less, it's more of "headwind" which will slow the car down, right?
I may have a simple explanation about the discrepancy you guys are saying. I will try to explain in detail as best as I can regarding the top speed of the 2019 Porsche 911 GT3 RS that you compared it with the 2022 911 GT3 version that I used here. Please pay close attention to everything I say or include. First off, according to Porsche's claim, the 2019 GT3 RS has a top "track" speed of 193 mph, which may or may not be its actual or true "top" speed -— https://newsroom.porsche.com/dam/jcr:e00c2789-42c7-4dab-a818-a732003194b0/2019_911_GT3_RS_Technical_Specifications.pdf.PDF
Second, again on YouTube — https://www.youtube.com/watch?v=7JdBaTZ1v34, under weather conditions, 2 times were listed: one at 10 AM, and one at 3 PM. However, on the video itself, both 10 AM and 3 PM "testing conditions" are slightly different, but it's okay. It wouldn't affect much the outcome. BUT, on the video itself, the top speed run was actually done at about 4 PM, not 10 AM or 3 PM. Now, since Titusville is just about 7 miles to the west of the runway, I would rather use its weather condition at 4 PM. I don't think the 2 locations would have very different weather condition, right? Going to timeanddate.com for Titusville, Florida on March 19,2019, you will get the weather condition at the time. Then inputting the temperature, humidity and pressure — https://www.omnicalculator.com/physics/air-density — you will get the air density of 1.193 kg/m^3 which we will use. The other specs and parameters are from the websites below. Again, I will use my own method and equations.
Hc = (0.00000556517pAfCdS^3+ 0.0026667CrSWt)/Pf -> my formula
Pf = 5,252Hc/EpTp -> my formula
2019 Porsche 911 GT3 RS
Hc = Horsepower 520 (527 PS)
EP = 8,250 rpm
Tp = 346 lb-ft @6,000 rpm -> 469 Nm
p = 1.193 kg/m^3
Af = 23.03 sq ft -> 2.14 sq mt
Cd = 0.36
S = 195.51 mph @33.0 psi
Wt = 3,260 lbs including driver -> 1,478 kgs
Pf = 0.95675
Cr = 0.0507 @33.0 psi
520 = (0.00000556517x1.193x23.03x0.36x195.51^3 + 0.0026667x0.0507x195.51x3,260)/0.95675
Finally, at the time around 3 PM, according to YouTube — https://www.youtube.com/watch?v=7JdBaTZ1v34, a 9-mph wind was coming from the southeast or southwest whatever, and the car was running north to south on the runway (actually the runway runs northwest to southeast — 196 mph minus 9 mph "headwind" = 187 mph. BINGO again? Thanks for the time.