Axle torsion beams 2014-2015 vs 2016-2019

[AZSP33D]

As the rear axle beams were updated somewhere around 2016 model year cars, has anyone examined the differences up close? Weight, dimensions, and perhaps some tortuously rigidity data?

 

[Tonda-B]

In my 2015 ST I use softer rear beam from nonST Fiesta 2015.
The weight is 19,8 kg bushes incl., which is about 5 kg lighter than the ST rear beam.

 

[CarGuy]

In my 2015 ST I use softer rear beam from nonST Fiesta 2015.
The weight is 19,8 kg bushes incl., which is about 5 kg lighter than the ST rear beam.

I guess my question would be, why?

Sent from my SM-N950U using Tapatalk

 

[Tonda-B]

Just to stabilize the rear of the car under heavy braking and not to have so much oversteer in corners.
See also: https://www.fiestastforum.com/threads/whats-your-fiesta-st-suspension-plan.1510/page-10#post-382628

 

[AZSP33D]

I have both (2014 and 2018 cars) and about to pull the 2014 to install aftermarket bushings... and remove the Pierce bar bolted in. Perhaps considering swapping out, from what I understand the ST200 came out with the newer square bars now used on the 2016 and up models. Square design seems heavier but I am probably not removing both just out of curiosity.