It's the smallness of the base car that's the problem...
Like back in the 80's with the Metro 6R4, it was never going to look great full of scoops and wings when based on that tiny shopping car.
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The funny thing is that Yaris is a lot bigger than MG Metro. Metro is reasonably smaller than today's smallest cars like Ford Ka.
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Colin Clark @voiceofrally
The Yaris WRC no longer looks like a run around with a picnic table strapped to the back, its now a bloody monster! https://t.co/yXPRiU077w
Downforce is fine, but do you know how huge the downforce is in DTM? I know it. Even without knowing those facts all of us have watched the video, You know the effect of Yaris aerokit (understeering, low top speeds etc.) . You saw it. You are a wise man, Mirek, so why do You have such need to argue with us every single time?
Because You write nonsense. Downforce can not make a car to understeer because downforce has no inertia... Of course unless we speak about downforce only at the back which would lift the front end but that's quite obviously not the case. Otherwise bigger downforce at front end always reduces understeering. Always.
Another nonsense is what You wrote about top speed. How do You know what is the top speed of Yaris and that it can't be reached due to aero drag? I am pretty sure You don't know.