My first cars in the fireseries ran with 5.25" wheel bases and was thinking of shorting to 5inches for the next basx race. Thought s on best wheel base for basx class.
This thread may prove relevant for those looking to unravel the wheelbase question.
Short version: A shorter wheelbase keeps the wheels on the curve longer and provides slightly more energy out of the incline. A longer wheelbase provides more stability and is easier to tune.