This is unsurprising, yet cool nonetheless. McLaren is taking its 720S sports car and turning it into a full-blown, factory-supported racer. McLaren, like all serious sports car builders, has more than a little history in turning the factory cars into racers. This is not a new thing. Indeed that’s what the “sports” in sports car means: You can, are encouraged, and are supposed to race the thing.
Back in the 1950s (to just pick an era at random) if you drove something like a Jaguar XK120 and didn’t race it on the weekends, you were somewhat suspect. You raced your Jaguar, because Jaguar raced theirs. It was what one did, old sport. Of course, back in the 1950s, a McLaren road car wasn’t even a gleam in young Bruce McLaren’s eye. At that time, he was messing about with modified Austins and such in his rural New Zealand. And winning with the darn things. Fast forward more than half a century, and the company that bears his name is still in the thick of things.
The thumbnail sketch here is how the new 720S GT3 will be a follow on effort to McLaren’s successful 570S GT4 and 650S GT3 racing program. The 650S stacked up the trophies like nobody’s business, winning 19 races, landing on 19 podiums, and grabbing the pole position for the Spa 24 hour race. The 720S GT3 will begin testing next year and launch with customer teams in 2019.
The specs for the upcoming 720S GT3 are very impressive indeed. Power is supplied by a race-prepped 4.0-liter twin-turbo V8, M840T engine. No power output is specified (of course), but since the street version puts out in excess of 700 ponies, you can expect the race car to either put out more than that, or safely match that number and not blow up over the course of a race (not blowing up is a very important thing in racing). Ratios are selected from a six-speed sequential motorsports transmission. This is all a nice way of saying the internals are all-new, the ratios available comprise a much broader spectrum; and out are such niceties as syncros and in are things like dog rings, straight cut gears, and change over times literally faster than you can blink your eye. Naturally the drivetrain is situated longitudinally (mainly for packaging reasons) and sits in the middle of the chassis, powering the rear wheels.
Chassis & Suspension
The chassis is all cloth and glue. The McLaren carbon fiber MonoCage II setup is an ongoing refinement of what the Woking-based outfit has been doing for quite a while now. It’s very light, very rigid, and could probably take a broadside impact without deforming much, if at all. Carbon fiber is also used in the body panels, front splitter, floor assembly, dive planes, and GT3-specification rear wing. All of these: the chassis, bodywork, and aero bits are specific to the 720S GT3 racer, or bespoke, as the Brits love to say. The 720S GT3 will be shod with Pirelli racing tires that will be controlled at all four corners via adjustable dampers (i.e. shocks) with coil-over springs.
On the inside, the pilot will be cosseted in an FIA approved seat with winged head-rests. Trust me, you don’t want to look too hard into stuff like side impact Gs, basal skull fractures, routine concussions that would get you permanently benched in the NFL, or the thousands of other reasons modern racing seats have headrests that hold your head firmly in place. Naturally, the driver in question is held in place via a six-point race harness, surrounded by an FIA approved roll cage tougher than jail bars with a fire extinguisher system just in case things get too hot.
The only real problem that McLaren has with their 720S GT3 is who they are facing off against. They’re going to have to run against Porsche 911 variants. And those things are nasty! They’re going to have to race against Ferrari 488s. And those things are nasty! They are going to run with Aston Martin GTs. And those things are nasty looking! The upside of this equation is that if you can win against competition like that, you will have every right to be proud of your achievement.
Tony Borroz has spent his entire life racing antique and sports cars. He means well, even if he has a bias towards lighter, agile cars rather than big engine muscle cars or family sedans.
Photos & Source: McLaren Automotive.
from Automoblog.net http://www.automoblog.net/2017/12/12/mclaren-720s-gt3-hits-track/
from Tumblr http://peternpalmer.tumblr.com/post/168469911626