It's really just the rear tire profile and how nice the Funco can slide and when to hit the turn brake and of course a competent driver.
Sorry, but I completely disagree.
First of all, Funcos don't just slide when you hit the turning brake. In fact, I rarely touch mine unless I'm basically showing off/trying to scare a new passenger. Second, it really, really, REALLY isn't just the tires.
I had an SCU Pro Bro, which is a great handling car.
I put the exact Funco rear tire setup on it (purchased directly from Grant) and yes, it slid better, but not nearly as good as my Funco. I wouldn't have believed it if I hadn't owned both. And my SCU was no slouch, it had a high-compression (race gas sometimes, E85 others) 427cui LS7 and I had done a lot of updates to it (including a rear sway bar which helped it slide as much, or more than the tire change). I wish I could explain how or why Funcos do what they do, but I can't.
So I guess it comes down to this: what are you trying to do? In theory, in the right section of dunes a mid-engine should be "faster" through a section (though every EPO has disproved that). In practice nothing dunes as fast as a Funco, and nobody is having more fun than the Funco owner. If you're racing against the clock worry about dreaming up and building the thing that will "slot car" through the dunes, if you're just out there for recreation (like every single one of us are) if you can do it, buy a Funco... really it's that easy.
FWIW on the wheelie topic, here's me goofing around...
This is in 3rd gear, this is *not* a clutch dump but obviously some big throttle blips. As you can see it took a good bit to provoke the wheelie. I shift into 4th mid-wheelie (right as the engine cage taps and the car does a little bunny-hop), feather the throttle a bit in 4th to keep it from dragging cage too much, then shift into 5th as I set it down. This car weighs right on 2900lbs (
@L.R.S. has a pic of it on his scales) and is a 440cui LS7 with a 4L Whipple (and an Albins).
-TJ