Are you talking about the drag video between the white GTR and the dark colored model S?
If so let's be fair and get some stuff straight.
-The GTR slept on the line BAD
-The GTR did not use launch control
-The model S cut an AMAZING light (professional driver stuff)
-The GTR doesn't brake boost at the line
-You can clearly see the Model s get run down by the 100 foot mark
If you have a stock 2014 GTR and a stock P85D with the same skill drivers on street tires, the GTR will win the 1/4 mile every time. This is because no matter how much power the Tesla makes it is limited by it's one speed transmission. The car uses a potentiometer so when you are stopped and then you floor it, the potentiometer cranks wide open to 100%. This is why it is so fast to 60mph. It does it in 3.2 seconds vs the stock base GTR time of 2.9sec. Very close. Within the range of driver ability. The issue is from 60-120. The transmission really lets the car down here. You will see many people complain about the Tesla's poor highway passing ability. Even the P85D will be beaten on highway pull by an STI or an EVO (MUCH less HP cars) because of the single speed transmission issue. In a normal car you can shift down a gar or two to get the car in the power band so you have more oomph and can accelerate on the highway quickly. This is not the case with the Teslas. The potentiometer is already open to a certain % so you have much less current influx when you stomp it at 60mph vs when you stomp it form a stand still.
The P85D is definitely a fast car, but a GTR competitor it is not. Not in a straight ling and DEFINITELY not around a track. That would be a joke.
The fastest P85D 1/4 on record is an 11.6 with a pro driver while any random GTR guy can run an 11.2 all day. A pro driver can run an 11 flat in a stock GTR. At 120mph at the line, that .6 seconds translates to multiple car lengths. It wouldn't even be close.
I'm not knocking the Tesla. The P85D is a FAST 4-door saloon, but it is not a super car by any means.
What the tesla has going for it is because it has no gears to shift and computers do all the work when accelerating to manage the power, it is VERY VERY easy to drive fast in a straight line. With 5 or so passes someone like me or anyone else with a small amount of drag experience could probably run a 1/4 mile close to 11.6. All you do is stomp the pedal. That's it. No other car, auto or manual, is even half that easy to drive in the 1/4 mile.
It should also be noted that for $55,000 you can buy a Hellcat Challenger that will do a 10 flat quarter mile and put both of these cars to shame (in a straight line) for less money. BUT, it takes a VERY VERY VERY skilled driver to run that time in this car. The difference between an 11.6 and a 10.0 1/4 mile is ALOT. That is the difference between a fast street car, and a purpose built drag car on slicks with full suspension. The fact that the Hellcat can do a 10.0 1/4 mile is staggering. That is outlaw class drag car territory (full cage, full suspension, slicks/skinnies, etc.)
TL;DR: GTR is faster because physics, not horsepower.