I have additional questions on this topic and perhaps the champ (Sam), or someone else with experience with the S197s, can help me out.
Ive only been autocrossing for a while and Im looking at some upgrades aswell. I am too, on a budget. My current mods are Eibach springs and a UPR Adjustible Panhard. I race SCCA, SM class, and Im thinking swaybars also.
The front only pushes when I make a mistake. My biggest problem is keeping the rear of the car under me during accelleration, so Im thinking a rear sway bar will do wonders, but I dont know how stiff I should go. Will getting a super-stiff rear sway bar make the car too unbalanced?
The stock S197 rear sway bar is 20mm, Eibach's/FRPP's is 22mm, Steeda's is 24mm, and H&R's is 26mm. Keeping in mind that I will continue to upgrade both swaybars and rear controll arms eventually, will getting the stiffest rear sway bar now, make the car too unbalanced? Is upgrading the controll arms a better mod to do first?
First thing to note is where you said it only pushes when you make a mistake. Well, that's to be expected, the best car in the world will understeer if you go in too hot. If the balance is good then the balance is good.
Running more rear bar will not make the rear stay put under you better, it will make the car more loose. Your complaint is pretty clearly power on oversteer. Comes from spinning the rear tires. Worse on less sticky tires that are easier to spin. And given the car seems well balanced on stock bars I'd have to guess you might be on some sort of street tire vs. a set of R-comps?
More rear swaybar, from what I gather here, it not the answer--at all. Without knowing the details (all of them, what parts are on the car, what tires, alignment, etc) I can't say "do this". Too many factors at play. Now, I'm happy to go over the setup and make some suggestions to you. But I have to ask you call me. It's not possible for me to feel like I have all the info I need and make a recommendation I'm good with by e-mail. Way too vague
My phone number is 814-849-3450. This is what I do. I don't just sell parts, but look at the setup as well and make sure we are what I feel is the right track.