As usual, people don't do any research and just spout out data that supports their points whether it is true or not.
First and foremost, the P1 does not produce more "downforce" (yes, this is the correct spelling) than an ACR-E. Here are the facts:
ACR-E- 1,710 pounds of downforce at 177 mph
P1- 600 kilograms (~1,323 pounds) of downforce at 161 mph
http://www.popularmechanics.com/cars...per-acr-drive/
http://www.topgear.com/car-news/gene...ion-mclaren-p1
http://www.evo.co.uk/ferrari/laferra...rcars-stack-up
As for why the P1 was slower at Laguna than the ACR, it's a combination of things.
1. Laguna is not a big speed track, so the P1 couldn't take advantage of its additional power.
2. The P1 can't effectively deploy the power it has in low speed corners. A major part of this is the 305/30R20 tires (the same width as a 991 GT3 which "only" has 475 hp) but possibly the open diff as well. Just look at the difference in tire sizes:
P1- 903 hp fed to 245/35R19 93Y; 305/30R20 103Y Pirelli P Zero Trofeo R
ACR- 645 hp fed to 295/25ZR19 90Y; 355/30ZR19 99Y Kumho Ecsta V720 ACR
LaFerrari- 950 hp fed to 265/30R19 93Y; 345/30R20 106Y Pirelli P Zero Corsa
918- 887 hp fed to 265/35R20 95Y; 325/30R21 104Y Michelin Pilot Sport Cup 2
Z06 Z07- 650 hp fed to 285/30R19 94Y; 335/25R20 99Y Michelin Pilot Sport Cup 2
GT3 RS (991)- 500 hp fed to 265/35ZR20 99Y; 325/30ZR21 108Y Michelin Pilot Sport Cup 2 N1
In short, additional power is only effective if you are able to consistently utilize it.
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