Fiesta ST autocross accident

[tri-pedaler]

205/45/17 tires. But idk if I’m asking for trouble with that tire size. Also, are the re 71rs or a052 too much tire for a fiesta st with stock suspension?

That is a lot of sidewall and additional CG for AutoX. The ‘stones are great so I would honestly be worried at that height. Go stock 40 series, or down to a 215/45/16 if you can get wheels for it— it’s a very light setup.

do you have experience with the car at an event? If not I’d just run what you have for now and get a feel for it.

 

[pixelzombie]

Bumping this thread instead of starting a new one.

So it’s been almost 4 years since the original post. Has there been anymore tipping accidents while autocrossing? Seems like the track guys are having no issues.

I just got a 2019 fiesta st with a moonroof. I was originally thinking about using 17 inch wheels with 205/45/17 tires. But idk if I’m asking for trouble with that tire size. Also, are the re 71rs or a052 too much tire for a fiesta st with stock suspension?

I’ve read a few threads on this forum and posts on the Facebook groups. But nobody seems to discuss this subject.

Thanks

Why would 17" wheels be an issue? I run that size and it feels secure, especially after lowering it an inch or so.

 

[tri-pedaler]

Why would 17" wheels be an issue? I run that size and it feels secure, especially after lowering it an inch or so.

If you’re in H Street you can’t lower it. It’s more the 45 series tire he’s suggesting that’s the issue. A 40 series with 17s would be fine.

 

[PWRSRGE]

I don't think it has happened again. Pretty sure it would be all over the internet if it had.

Here's an example of A052 used on a Fiesta ST for autocross: https://www.fordmuscle.com/features...art-5-driver-comforts-and-yokohama-a052-test/

Yeah, I think that was the only example I saw of a fiesta st. I did see other vehicles flip, for example fiat 500s.

 

[PWRSRGE]

It still happens. Local guy had one go up on two wheels. Lot of it is course dependent. 95% of the time you will be fine.

I autocrossed for years and I did see a lot of fwd hatchback being tripods for a second or 2.

 

[PWRSRGE]

If you’re in H Street you can’t lower it. It’s more the 45 series tire he’s suggesting that’s the issue. A 40 series with 17s would be fine.

Yeah, Im thinking about doing h street next yr. And I’m worried about the cog being too high on this car.

 

[PWRSRGE]

I guess I forgot to mention I’m thinking about competing in h street next year.

I also autocrossed for 9 years but haven’t in the last 4. I have experienced with a mk5 gti, c6 and c7 corvettes. So I didn’t put a lot of thought about cars flipping on their side until I bought the fiesta.

 

[Fusion Works]

I autocrossed for years and I did see a lot of fwd hatchback being tripods for a second or 2.

Tripod is normal for a FWD driven hard. I never worry about when on three wheels. Two wheels is an entirely different situation and it does happen sometimes with a Fiesta in autocross, but its exceedingly rare. Lot of it depends on your tires and driving style.

Next year will change in street class. I think there is a rule change coming about shocks in Street class. Might want to check on that. I would stick with the OEM wheel and tire sizes.

 

[kivnul]

I run stiffer than stock suspension, I 3 wheel the car every run. I have been told that I've had it on 2 wheels on occasion (I could not tell while driving). 2 years ago, a novice driver rolled a fiesta at a neighboring autoX course. These cars can roll but it takes a combo of sticky tires and a series of steering inputs that gets the car to rock side by side a couple of times (more so than a standard slalom)

If you are extra concerned, get a feel of the car autocrossing with a more street oriented tire. Move on to the A052's or similar once you have that comfortable feeling.

 

[tri-pedaler]

I guess I forgot to mention I’m thinking about competing in h street next year.

I also autocrossed for 9 years but haven’t in the last 4. I have experienced with a mk5 gti, c6 and c7 corvettes. So I didn’t put a lot of thought about cars flipping on their side until I bought the fiesta.

You’ll be great. Send it - but please don’t get 205/45s. That could be dangerous. 40 series will be fine

 

[tri-pedaler]

Tripod is normal for a FWD driven hard. I never worry about when on three wheels. Two wheels is an entirely different situation and it does happen sometimes with a Fiesta in autocross, but its exceedingly rare. Lot of it depends on your tires and driving style.

Next year will change in street class. I think there is a rule change coming about shocks in Street class. Might want to check on that. I would stick with the OEM wheel and tire sizes.

Can you link to this discussion? Are they going to allow spring changes / coil over as well? That could be really interesting!

 

[tri-pedaler]

I autocrossed for years and I did see a lot of fwd hatchback being tripods for a second or 2.

Yup - we’ve all got “that picture”

 

[SteveS]

I autocrossed back in the 1980s and all FWD cars were hiking the inside rear wheel, including my 1978 Fiesta S. Many RWD small cars were raising the inside front wheel as well.