What did you do to your Fiesta ST today ?

Finishing up tuning for E50. VDyno of the last revision before I go to the hub dyno either later this week or early next week. Car is an absolute blast to drive and I had Westley work on tuning the S280 as much as possible out to 7,700 RPM for autocross so I don't have to shift. I'd rather take some HP hit than bounce the limiter or be forced into a lower RPMs.

Well, that looks like fun

Sure does.

Damn that's definitely a blast to drive! That powerband is smooth

damnnation.

do the tires just spontaneously combust when you start the car, or does it wait until its warmed up at least????

I cant imagine keeping that in a straight line... LSD?

MFactory differential, it makes a huge difference. This car is both my autocross/track car and my daily driver, so I've got two sets of tires/wheels.
After I got the diff put in the car really just became point and shoot, even with my worn out stock suspension I was competing in XA/XB and winning events.

The tires and wheels I use off season can't really handle the power. They are getting a bit old and will spin if I WOT below 65mph. Which are Nitto Neo Gens 215/45R17 on the heavy DR34s. (280TW)
But, my autocross tires are Falken RT660s in 225/45r15 with Team Dynamics (200TW). Those can hold the power no problem, but that was before this last big push with the E50 fueling. I might have to switch to Tempesta's or finally give in and get coilovers and flares to go bigger tire. Since it's winter here in Washington I can't daily with the 200TW tires, when I was in Texas I'd run Falkens year round and put 10k miles on them while using them for events, they didn't give up until about the 9k marker.

that is great info, thanks. have an S280 and all the stuff sitting in the garage. need to add a diff to the list...

are you on a factory rotating assembly, or something stronger?

Stock block and top, pulled out of a 2016 Escape with the heat sensor in it and 60k miles on it. I'm pretty much at the absolute peak you want to do with the engine in my powerband. Westley has been able to pull some insane numbers with other turbos in the higher range on stock block, but it's all power I can't really use for autocross.

(A shop damaged my last engine unrelated to the S280 and tuning, this one was like 1,200 dollars and I've already put around 10k miles on it)

wow.

and to think I bought the ST to 'reduce license risk' from using my modded RS to run around. guess that is right out the window once the new stuff goes in.

the wife is going to be thrilled, THRILLED I say...