I think you mean Dollymount... not sure if cars are still allowed though its been a few years, Donabate is just north of the city and cars are allowed in certain areas...
I popped up to Dollymount on Saturday though at the time I didn't know that was what its name was. Just seems like there are a couple of car parks on the beach, so you can't exactly hoon along.
Heading west to Galway at the weekend, then up through Connemara and round Donegal...