I find I get more tense in sim racing than I do in real life racing, I'm glad I'm not the only one
A 30 minute sim race can be more taxing for me than a 2 hour stint in a LeMons race (at least after we got a cool-shirt system for hot days).
Its something I'm actively working on though, sim racing should never count as a workout! For me, I think a lot of it has to do with missing the sensations of a real car. I tend to carry tension in my shoulders to keep them dead steady while a light grip on the wheel gets me the most feeling from the force feedback.
Since I'm more of a kinesthetic driver than a visual one, I rely heavily on that feedback. Its probably why I'm god awful (like division 12 speeds) with a controller. Talk about tension, with a controller I'm that guy that's white knuckled while on the sticks, banking the controller left and right like it would help the car do what I want.
What I need to do is become more visually oriented, to trust my eyes more and only use the force feedback to supplement that.
I think that's the case anyway. On Sims with more lively force feedback than GT6 like Assetto Corsa or iRacing, I tend to be much more relaxed.
I haven't found the complete answer yet, but one thing that seems to help if I find I'm a little tensed up while practicing is to run a lap or so sloppy. Go drive a lap like Jeremy Clarkson, just toss the car around. It seems to orient me better with slip angles and since I'm not focusing on precision or lap times, I don't carry that tension since I don't care if my reaction to the FFB is perfect.
As Hill mentioned, driving so that you have spare mental capacity helps too. I'm much more relaxed and usually run just about as fast times if I'm talking to someone in the practice room while lapping. I've been chatting with a lot of snails recently in practice rooms. So feel free to keep on talking to me guys, it actually helps my driving
Obviously that's not an option in a race. There you have to realize that your tensing up and just try to relax. It seems easier the more practice I have on a particular combo.
Edit: grats @
kcheeb , that's awesome! Hadn't read through the weekly rewind yet till I saw the other snails' posts.