I couldn’t do it. There was no way to get the oversteer out of the Mid-Bucket without going to bigs and not-so-bigs. The extreme rear weight bias just was too much for all my tricks and tweaks. I can’t fight physics and no matter what I did I still ended up with oversteer at the limit. Sometimes it was only hang the tail out and go slow oversteer, but most of the time it was understeer up to a point, balanced and then snapping loose and driving backwards off the road.
Now running racing slicks is no problem, bigs and littles is a common setup for mid-engine race cars. Lots of choices that would be balanced at the limit. Just-driving-around tires I also have solved as this is a common setup for hot rods. No, where this is a problem is street tire autocrossing, the thing I’m building this car for. Naturally.
If I stay with 15″ rims I’m pretty much boned as the 245/40 size is pretty much the widest tire I can get in ≥200 UTQG wear rating. I can use that in the rear and run a 195/50 front and get balance but not ultimate grip. My competition will be running 335 wide in the front, and even wider in the back. Granted I’m driving <1600 pounds and they're almost twice that, but still I'm going to be down on grip overall compared to the competition.
The next size up in rims with performance tires is 17", which gives me a whole lot more choice in sizes. The downside is I lose the automatic lowering for racing because the 17" rim increases the diameter of the tire by 2", it's just physics. For the same width and profile the 17" rim is always going to be 2" taller than a 15" rim. I'm still going to be a tiny bit shorter than my street tires on 15" rims, but not by much. And the thought comes to mind that if I'm going to have to use tall tires to race on why do I need to get just driving around tires? I'm not going to be driving a traditional Bucket so why run traditional street wheel and tire sizes? The treadwear requirements for the street tire autocross make the tires usable for daily driving, so why not drive them on the street?
And I'm starting to repeat myself while I type (I deleted 2 whole paragraphs) so this is a good time to quit.
Billed @€0.02, Opus the Unkillable