If you tried to run tc sized tires on a pan car, it wouldn't handle very well and would have low traction. Keep the wider foams on them and suddenly they work great, stick very well and can stop. It comes down to traction. The tires on tc cars are the same size as each other all around but are very narrow and all 4 wheels drive. Weight is pretty equal front to back. 2wd "off road" buggies do well on high grip tracks but again, they don't run narrow tc tires.
If you want a 2wd IRS on road car that handles well, use tires more appropriate for the job that are wider in back. You can still get foams for dirt oval 2wd that bolt right onto an RC10DS and they work great. They aren't as wide as pan car rear foams but are much wider than tc tires. They are a great compromise. A 2wd car needs more weight bias to the rear. The only tires that accelerate and brake the car need to have adhesion. There are already 2wd on road cars that are fast that don't suffer the problems being argued about here. They just don't use tc style tires.
Last edited by fredswain; 03-08-2017 at 10:02 AM.