Seeing that the PSS’s are asymmetrical non-directional, I wonder how much of a difference the direction makes (if any)
The Mclaren launch control doesn’t spin the tires at all, its calibrated for the P-zero OEM tire, unless you get the factory to send you the calibration for Corsas. That’s why he’s saying he doesn’t think a sticky tire makes a difference. I personally disagree, it’s nuts that he managed the times on the tires he was using, first the P-Zero and now the R888, and his 60’ is crazy considering its RWD on street tires. The soft compound R888 had a lot to do with this.
So many systems in the car are calibrated based on OEM components that the factory very much dissuades you from going your own way. The tire calibration affects so many other things, launch control, ABS, stability control, all the track setting trickery, and its based on tire temp and pressure calibrations too.
it’s kinda a BS situation, but you don’t have too many owners willing to risk the car to try anything different. So even going with a non-spec tire like the R888 can be a pretty bold move.
J, Curious… What does No Limit show for slope data?
I found it funny that a guy who just paid a quarter million dollars for the car would even bother to reference that these are a better deal than the Pirelli OEM Corsa option tire.
Prime I looked at home, thats a tough track to find on the map! but IIRC it wasn’t significant elevation change on Google Earth, ill share when I get home.
Sak, you must know about dealing with these sorts of people, a LOT of them are the cheapest bastards you’ll ever meet. Seriously! But also gotta agree, I’d probably take a chance on the R888s over the Corsas anyway, given the much bigger user pool and availability.
J,
If you’re referring to the difficulty in finding PBIR, try locating the North County Airport or Pratt & Whitney headquarters PB County, should be on the north side of the Beeline Hwy. If you’re trying to find a different track then I apologize for stepping in.
Lol oh no, PBIR was the first track I Looked at the slope for! actually if you look at the pbox for the 10.37 run youll see very little slope showing.
But “no limits”, it’s way out on the plains near Morocco, IN…all farms all around. No wonder they didn’t have enough money to get certified…it’s in buttfuck nowhere.
I just posted this information on 6speedonline, home of the 60-130 database everyone follows.
Am I about to be pelted with tomatoes?
+++++++++++++++++++++
I have been looking through the pbox data of a few cars, and found some really interesting information.
The 6speedonline thread allows as much as a -3% negative slope, right? That’s pretty significant. On a really quick car about -20 feet over the 60-130 run. On a slow car like my stock 2008 Audi RS4 (13.5 seconds on a flat road) that’s an elevation drop of up to 50 feet (takes me upwards of 2000 feet to complete the run). Fine.
HOWEVER
Recently a McLaren Mp412C ran at Palm Beach International Raceway on the dragstrip, and had his pbox running. He ran an incredible 10.37 quarter mile time bone stock. Nuts. Anyway, his pbox on one of his runs showed a negative slope over his 60-130 (6.6 seconds for interest’s sake). The negative slope showed as -2.5% or about 25 feet. over the entire dragstrip 1320 foot run, the drop was about 30 feet.
Wait a second…the dragstrip at PBIR has a -30 foot elevation change from start to finish?
Not according to PBIR
Not according to google earth
Not according to the NHRA
Not according to surveys of the land
Not according to anything I could see that measured elevation change over that stretch of land.
Just the pbox.
So the pbox, we can assume, was off. It got the elevation change wrong by almost 3%. Or everyone else made a mistake (unlikely). Or PBIR is cheating in order to hold a reputaiton as a fast track (possible in theory, but reputation risk and NHRA certification make this just about impossible)
Does this concern anyone? I’ve also seen this on my own pbox. -8 foot drop on one dragstrip pass…and a positive 3 foot slope on the next pass. -17 feet at Thompson raceway in Ohio on one pass, less on another, and flat on all the survey and geo data I have seen, not to mention IHRA certification.
Here’s the 60-130 graph, and then a video of the quarter mile run.
http://www.dragtimes.com/images_vbox/25329-2012-Mclaren-MP4-12C-vbox-60-130.jpg
6speedonline is pretty douchey, you may get pelted, but who cares.
I’m actually surprised you picked up the bone I threw out, cheers. Can we move this to a new thread now? Or should I change the title and start the McLaren thread again…
I’m curious how the Pbox measures descent, does it have a 3 axis accelerometer or is it all gps? never used one.
How well are they mounted to the vehicle? A bit of oscillation could give it some weird readings
10.27 @ 135.55 now, the stock car owned by the drag times guy.
EVOMS tune worth $5k only gave it a tenth and one mph boost. Disappointing.
http://www.dragtimes.com/blog/mclaren-mp4-12c-aftermarket-ecu-tune-testing
wow… just wow… Tuned time is 10.19… lol
10.27 @ 135.55 now, the stock car owned by the drag times guy.
EVOMS tune worth $5k only gave it a tenth and one mph boost. Disappointing.
http://www.dragtimes.com/blog/mclaren-mp4-12c-aftermarket-ecu-tune-testing
wow… just wow… Tuned time is 10.19… lol
the car that went 10.2 stock went 10.1 tuned? Or two different ones?
when they were both stock, they raced and one car whipped the other one pretty regularly. 2 car lengths each time. Wonder if the tuned one was the formerly slower one, and the stock one is the formerly faster one.
the car that went 10.2 stock went 10.1 tuned? Or two different ones?
when they were both stock, they raced and one car whipped the other one pretty regularly. 2 car lengths each time. Wonder if the tuned one was the formerly slower one, and the stock one is the formerly faster one.
The dragtimes guy owns the stock car, same car that went 10.5, 10.3, now 10.27. That car is FAST, he’s like the Primetime of McLarens. Always at PBIR.
A different guy got the same tires as dragtimes guy, r888s, and the EVOMS box, and did the 10.19. It’s maybe unfair to compare him to dragtimes guy, like I said his car seems faster than the rest.
they’re also maybe 2011 vs. 2013 or something
The dragtimes guy owns the stock car, same car that went 10.5, 10.3, now 10.27. That car is FAST, he’s like the Primetime of McLarens. Always at PBIR.
A different guy got the same tires as dragtimes guy, r888s, and the EVOMS box, and did the 10.19. It’s maybe unfair to compare him to dragtimes guy, like I said his car seems faster than the rest.
they’re also maybe 2011 vs. 2013 or something