It comes down to how much power your car is putting down and how serious you are.
Do you have a 185kw, FMIC, exhaust, filter car or a 300kw, GT3076 + supporting mods car or a 350+, forged, gt35 + all the fruit car?
If it's 185, a warm up is pointless, traction won't be an issue. If it's ~300ish then it might be of use you're running street tyres, but in reality you'll do better simply managing your throttle and clutch better. If it's the last option, then I would expect you are running slicks and intend on launching hard and a warm up burn out is definitely beneficial (if not slicks then no amount of street tyre burnout is going to stop you wheel spinning for a good portion of the race).
So, in conclusion, I'm going to bet your running moderate power on street tyres which means a pre race burnout is going to give very limited benefit. But do one anyway, cause they are fun