What are the front/back incline angles of California?

Refine your search to angles of approach and departure, and breakover, words more commonly used for this than angle of attack. Maybe that will yeild better results. Hth.

 

Personally-speaking, I would just correct the sharp transitions at the bottom and at the top of the ramp. The ramp is compromised and will cause problems with many cars, not just the Cali. I've attached a scaled simulation of the situation that you have, using a scaled model of the car.

As you can see, the A1 / A2 clearance is the worst problem. The California does not have a long front overhang but clearly 13° does not give you much clearance if there is any compression of the suspension/tires as you hit the bottom of the ramp, going down or backing up. The other concern comes from B1, B2, B3 and B4 as the car crests over the top of the ramp. Again, your biggest worry is if you go over the transition at any speed that causes suspension/tire compression, which can result in contact between the ramp and the undercarriage or the front splitter.

You can zag-zig the car to create lower angles to the ramp but your ramp is narrow and I personally would not want to attempt that on a regular basis as a misstep might result in other problems.

My simulation is pretty accurate to scale but there will always be differences when accounting for compression of the suspension and any irregularities on your ramp as well as measurement error(s).

IMO, this looks too close to chance and you are better off correcting the driveway ramp if you can. This sort of situation is quite common in Europe and with some of the new compromises they use for urban homes everywhere. See if you can level out the lower transition and round off the top transition. Make sure the people doing the work are experienced. Fix the ramp properly and your choices of cars open up dramatically and you no longer have to worry every time you use the driveway.
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Good luck and let us know how you make out!

 

Impressive 4th_gear!

 

Thanks! I thought it was interesting and fun to do... always wondered how much clearance my car would theoretically need.

 

We need you in Washington -- maybe you could "fix" some things there too!

 

That's a bit of a tall order for anyone... but hey, we can at least try, right? I'm keeping my fingers crossed for our great neighbours!