The 914 has a set of 165/??R15s mounted on it. Probably 70- or 75-series, since the tread is so narrow.
The thing is that with so little weight (2200lbs ... dry?) and so little power (~95hp) I've only really spun a wheel once. Even when pushing the lateral traction to the edge, everything sticks really well. Low center of gravity and great weight distribution is amazing stuff.
And lightness. So much lightness.
My motorcycle has more hp than that. It also weighs less with me on it.
That would explain all the wheelies, you hooligan.