Also you need to get your brakes set-up properly so they're not too full on and you've got a good feel for it.
The other thing that helps is to run the car with knackered tyres or on some ground that's got no grip as this will really help your all round car control and importantly the throttle control - that's one of the things to master with 2wd, 4wd you can get away with nailing it a bit more but 2wd can require super smooth throttle control to be really quick. Racing lines will come naturally after a while, and after a bit of watching.
If you watch some of the top heats at Nationals etc, you'll often think someone is cruising round but if they're not crashing can very often be going a lot quicker then you think - smooth is fast
