Spanish Grand Prix 2015, Catalunya - Race 5/19

he went in too fast but why stop him from the race?

Because there were two options the actual brakes failed, dangerous car, or mgu-k went, and the car would be even more embarrassingly slow and potentially dangerous(as the car struggles to brake without the mgu-k), already would have been a horrendously long pitstop, come out maybe if lucky ahead of a Manor, pointless basically.
 
Terrible race

If Maldonado didn't have damage and Grosjean probably hadn't damaged his car going over the corner and the strips there, jumping across them, I think we'd have seen them really pushing towards maybe Massa, potentially Kimi, could have seen a good fight there.

But yeah, Australia, Barca, Monaco, usually very poor races. Australia gets more than average safety cars which can at least close the pack up a couple times a race. Here is too open for safety cars really or many crashes. Monaco, could have a safety car every 5 laps to close the grid up, still won't be any overtaking.
 
PRoblem is if Vettel can go another 5-10 laps, he can one stop, maybe slowly and Hamilton still may be a threat after his 3rd pitstop. But they aren't necessarily on the same strategy at this point.
 
3 stop is a bit quicker than 2 ted said earlier.

The two/three stop which is faster is based on effectively a single car on track, theoretical. A three stop would only be faster in general if you could never be held up or prevented from using every inch of the tire every lap from start to finish.

So you want to be half a second faster for an entire race, not just the second half of the race.

However Hamilton has a clearly faster car than Vettel so it's still very possible compared to him, compared to Rosberg it would be highly unlikely to help.

He needs to gain an entire pitstop and the what 10 second gap Rosberg had, so 32 seconds over the 32-33 laps in the race... possible but not too likely.
 
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