I am in the less is more on front sway bars on this car but I might end up with a bit bigger bar to test once I get to that point, I would probably go no bigger than the none ST bar as well.
This is my 3rd FWD street/track car build, right now I am running the stock front bar, Steeda adjustable end links to take out any preload and urethane bushings. No rear bar and on track the car is very fast and stable without much body roll due to the BC race version coilover springs. I have modded Ground Control 5 way adjustable rear sway bar to fit this car but have not tested it yet, I will the end of April and report what I find.
First car was a turbo Matrix(1st 1zz turbo matrix in the world), very similar layout as the FiST, moderate front and rear bars worked well but I forgot who made them, it was 2002 when I built the car, if was a very fast autocross car, shocked a lot of "faster" car owners with it.
Second Scion TC, far more modded, no front bar, Huge custom rear bar, rear independent suspension can make for a very different setup but I had a big splitter, undertray, and wing. I was hitting 105 MPH out of Witchcraft at MMP but needed to slow down a bit as difficult to line up for the entry into the attitudes, probably best speed would of been 102 or so. Later watching a Trans Am race video I noticed the front runners were coming out of that turn at around 99 MPH.
So far with the FiST I have been up to around 95 MPH out of that turn on much narrower tires and just a small splitter undertray and the first time out on track with it.
Though I kept forgetting to turn off the nannies, LSD helps, I only felt them on the slowest corners and a couple of times when I over drove a few mid speed turns. So far my lap times are only a few seconds slower than the Scion tc, it was fast enough to take second in a national TT race against pure race cars but would of won the next day if not for 5 holes in the block from a bad tune.
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All that said, sway bars are dependent on car setup, driver style, and the last thing to dial in, the faster you make the car without sway bars the better. At least the race setup books I have studied for years all say that
The FiST is by far the better car out of the box over those two that I made very competitive and in fact more power was what I needed the most on track so far, which is happening right now, parts nearly ready and on the way.