Bob Allyn posted:
I believe the practical limit for running through the narrows, and the speed Jim Peruto did in the narrows are two very different speeds. A properly setup Cup Car is capable of cornering forces in excess of 3 lateral G’s as compared to a C7 corvette Z06 at 1.2 G’s.
While you are correct that a Cup Car's cornering ability is far greater than a stock car when fully set up, recall that for ORR the setup calls for almost no camber, almost no toe, and lots of caster for straight line stability, making the car "tight." My own Cup Car had .5 negative camber, 1/16" toe, and 7 degrees of caster and could not pull 3Gs with that setup. My average speed through there was about 125 mph until the last two left turns, (when I began accelerating hard, hitting 175 mph just out of the narrows and shifting to 4th) but the car was also rock-solid at 221 mph on the straights, where it counts on this track. Does my setup match what your setup/results were through there? Do you know what Peruto's setup/speed was (just curious, I don't know)?
Last year, in my C7, about 120 mph through there was fast but comfortable, but I think the takeaway here for non-unlimited drivers is that you lose so little time (against your overall target time) by slowing down a little bit more than necessary through that very short section, that it's best to be on the safe side and make time up before or after the narrows.