Andreas,
That is where the issue is. I'm trying to find a good wide tire that has good stickiness characteristics to it because the car is turbocharged and will be pushing at around 400whp. So, for a roadcourse or even street driving, I'd like the car to have a chance with traction. If possible, the aim is to have 225 or 245-width tire at the most (even more if I can fit it in without any mods). 205 I think won't be a wide-enough patch. I say this only from my prior turbo experience.
On my 240, I started getting great traction and stickiness when I went with 245/40/18 up front and 275/40/18 in the back (Bridgestone Potenza S-03 Pole Positions with Nismo LMGT2 wheels). But when I had S14 wheels with 205/40/15s (IIRC) Kumho Ecstas, I was all over the place before traction would take hold.
So for a FWD, and especially for a B14 (which is a totally new chassis to me), I don't exactly know what's out there and what I can fit inside the fender wells of the B14s to get that kind of grip like I did on the 240.
In conclusion, I think the only way a FWD car with the power that I'm looking at making will only be able to have good, predictable traction if I went with the widest and as sticky tire as possible like the Bridgestones I speak of. Again, I say this from my experiences with my 240. Given where I'm coming from, what size would you recommend I go with for wheel/tire combination on a B14 chassis?