Alright, this is pretty long and I don't know how old it is, but I found it off of jalopnik posted by "doyleg" a couple of days ago about his driving experience with a preproduction P1 (P1 OOV):
Among other appearances for P1 00V, including Jensen Button doing the hill climb in it at Goodwood last year and Top Gear driving it to/at Spa, P1 00V is one of the cars they let P1 buyers, and some prospective buyers, test drive around the Top Gear track at Dunsfold. I am fortunate enough to be buying a P1 so I got to do this earlier this year. What a test drive!
McLaren provides a top-flight instructor to teach people the course and all the cool things the car can do. In my case it was former British GT Champion Brad Ellis. We started by doing several laps trying the different modes and settings. First we did an all-electric lap. It's no record breaker in that mode but it's surprising fun for pulling away. Then we tried a mode they call "boost" where the car uses only the gas engine until you press the red IPAS button on the steering wheel to boost the car to full power. With the 727HP gas engine alone this is already a VERY fast car. To illustrate that; consider that the P1 weighs about the same as a McLaren 650S which itself does 0-60 in 2.9 seconds on street tires with only its 641HP gas engine and less aerodynamically efficiency as the P1. So at only 727HP the P1 is no slouch and it feels like a very fast car in this mode. However, get it up to speed and press the IPAS button then HANG ON! You've now added another 176HP of boost to the car and holy smoke does it fly! 99% of people would be blown away by this car even before the e-motor kicks in.
But all that's just the amuse-bouche of the P1 when you're on a track. Now put it in RACE MODE and prepare for something you've probably never felt before (well, I haven't anyway) and that's incredible downforce. This is when we tried the other steering wheel entertainment device, the blue DRS (drag reduction system) button. Imagine you've got your foot nailed and you're driving this rocket down a nice long straight and it feels like you're ripping hole through the air, got it? Now lay your thumb down on that little blue button and it feels like the rocket you're in just escaped the earth's gravity. You get this giant WHOOSH feeling like someone gave you a big push from behind and your speed climbs even higher. It's the most incredible feeling. I can see how someone could see the IPAS mode as just something for entertainment, after all in normal and track mode the P1 will give you the full power on demand anyway, but DRS is all business if your business is speed and you've got clear space ahead to let it fly. I've already plotted out exactly two straights where I'd use this on my home track and I can't wait to try it!
From there on we kept it in race mode and Brad urged me on to go as fast as I can and push it as hard as my courage would allow lap after lap after lap.
When my stamina finally ran out, Brad got in the drivers' seat and did a few hot laps to show me what it could really do. WOW! It was like going for rides with The Stig while he tried to set the fastest laps on the Top Gear board. It was absolutely amazing. Here are some pictures I took that day.
The P1 was absolutely glorious! A feeling of speed like no other. I had driven the 918 on track a few weeks earlier but I found the P1 to be more exciting. It makes you feel more alive. The 918 is an amazing car in its own right but I bought the P1 instead. I'll leave which car is actually faster to the reviewers. Like the 12C/650S, the P1 has an adjustable suspension that makes it a comfortable drive-around town car to go with the big adjustable wing and lowered ride height that makes it a monster on the track. I love that it has two personalities.
On the track it can benefit from a lot more grip than the standard Corsa road tires can deliver. I've ordered a second set of wheels with the optional Trofeo R tires for track use but I'll drive to/from the track with those on. Everyone I know who has used them swears by them.
Before I drove P1 00V they told me; "The P1 you're driving today is still a pre-production prototype and has already had a more than a lifetimes' worth of thrashing. Your car will be better than this." So I was expecting a pretty beat up car. But if, after I finished driving it, they had given me the option to take this car home right away, instead of waiting 6 more months for mine to go into production, there wouldn't have been the slightest hesitation in accepting that offer. Many of the people who drove this car are experienced professional race drivers at the highest levels. So they meant it when they said this car had been thrashed hard. I don't remember the exact mileage on the car but I do recall bring shocked at how high it was when I was checking out the dials and adjusting my seat. But beyond the odometer there was nothing from driving it that gave that away. It drove like a brand new car. It felt like Chris Harris said "a whole new thing" and it was solid as a rock and was SO MUCH FUN!
It felt bloody fast and no harder to drive than the 918. It's extra inspiring through high-speed corners, has very direct steering and it feels so light and nimble. The brakes are nothing short of amazing as well. You get incredible feel and communication back to the driver from the brakes, steering and chassis. I just couldn't wipe the smile off my face the whole time I was driving it. It just felt like the perfect car for me. For the entire next week I had a very hard time not thinking about the P1. As you can probably tell from this reply it still haunts me - in a good way. My own P1 arrives soon and I'm already thinking about it night and day. I'm going to be zombie over the Christmas break with the car arriving soon after that! I have no idea how my family is going to put up with me.
Before you ask... no, we didn't record any lap times so I have no idea how fast we went around the Top Gear track. While I was at the wheel I was concentrating on the track so I never looked down at the speedometer any time it would have been impressive. When Brad was driving I was just watching his lines to see if was using the same lines as he wanted me to use, which he did, and marveling at what a great driver he is and how incredibly capable the P1 is in the right hands. It was certainly a day I'll never forget.