yep the higher the value the more failures the cars will have and its applying for all races, full, 15 laps, doesn't matter.
[Team #00]
Name=renault,renault
Performance=875,875,30000
First Driver=1,fernando alonso,16050,0,16050,0
Second Driver=2,giancarlo fisichella,15850,0,15750,0
875 stands for bhp for qualifying
second 875 stands for bhp for race
16050 stands for grip in qualifying
second 16050 stands for grip in race
that 0 means there is variation in the grip for the driver. If its set on for example 150 then the grip can be for this driver max 16200 or 15900 but when its set on zero its 16050 all time.