Yes that's good...

Very clever that you've ensured you can't go TURBO in Reverse - I had to think for a moment what you'd done there!

One observation, R3 isn't needed where you've drawn it, but it IS needed in series with R1, to ensure you don't ever apply full 12v non-current limited to the base of Q1, and that will also ensure a minimum time period regardless what position R1 is in.

You're going to get considerable sparking on the TURBO Relay contacts, so consider (a) a chunky Relay, and (b) some kind of surpression across the contacts (that's also a good idea on the GO Relay contacts) as the extra energy should be dissipated somewhere other than in wearing away the contacts.

Whoa No... there's a problem...

The Time-Delay Power for it's Relay (via the Parental Control Switch) is OK to be wired where it is (permanent 12v), but the Feed for R1 should be connected to Pin 1 of the GO Relay, so timing commences only AFTER the vehicle is already in motion. You're going to have to adjust your Zener and component values accordingly as that part is being fed from a 6v Supply.