It seems to me that the FIA changed their regs last year with regards to TC systems. This year it seems they are allowing it, as last year I read they were not allowed (yes i read the whole reg sheet right after the finale as testing begins {for Audi} one week plus 1 day later) for LMP1 (not sure about LMP2).
Strange things are about to go down between Audi and the FIA as now they are also using energy from the heat created from the turbo fan to power the front hybrid wheels as well (ERS-H. Energy Recovery System-Heat). Nothing has been published about the use of heat but kinetic is still allowed. My question is since the heat is constant and varies most when in and out of pits is can this energy be used whenever need, as last year they had to wait till the car reached 100 km/h..
anyways, back up to speed, a lot of the tire spin people have is they run their cars with too high horsepower, too high differential settings, and too straight of toe angles. My setup for my R10 and 908 in GT5 was to have almost 3.0 toe-out in the back and .5 toe-in for the front. That depends also on your driving style. I test all my cars at Le Mans as you really cant test cars for Spa and expect to use the same telemetry from those tracks to transfer to different ones. GT isnt that complicated yet to do so. But anyways, you have to find the perfect setup to get the fastest speeds at corners where you know the competition cant make up for.
Which basically limits it down to the Porsche chicanes as dropping off of the throttle there will cripple your momentum. Finding a setup that can make you hug the inside turn of the first porsche corner and then swap to the left, back to the right, back to the left, and then hold the tight right hander at full or more than 3/4 throttle is best.
Got off topic again.. tire spin... so yeah. Dont be affraid to use TC to find a good tune. Do some crazy things such as run the car on comfort softs with 3 TC, and 540 hp (regulations for 2011) and fix your transmission to stop tire spin. Then once you have gotten around every corner at the track you test, upgrade your tires a category to sports hards or mediums (i find no difference between the two). Find another transmission tune and move on again. Guarantee if you spend a whole days worth of time with the car, you'll get it right. Then, 3:24's around the Sarthe wont seem to hard to get..
ohh and here is a link for this year's regs for LMP1..
http://www.fia.com/sites/default/files/regulation/file/TECHNICAL REGULATIONS LMP1 (2014)-V08-27.09.2013-FINAL.pdf