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They're not the same platform.
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Yes they are.
They are the VAG A4 platform (not to be confused with the audi designation)
Platform meaning the main structural components, engine mounts, suspension pick up points are all in a pre-determined place within a set of selectable positions...FWD, 4WD etc...
The platform is not the same as floorpan, or chassis.
The platform can produce cars that vary in size (TT ro Octavia for example) but the key mechanical positions, crash zones and certain wiring looms remain constant.
That's what I mean by platform.
The new S3 will be on the same platform as the new Golf GTI and R32.
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i.e. the old Golf and the TT were only 20% similar. Popular comment is the TT is a Golf in a party frock but it was far from that.
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I know that....as do you...
but there are similarities...like the inherent safety of understeer designed into the platform that all models suffer from.
The 20% you speak of is the common platform items...wiring, basic crash structures, suspension placement (front...or both of 4 motion vs quattro), electronic control modules etc...
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The platforms are very flexible and variable. So far it's used for the Golf, A3 and even the Passat which is much bigger.
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Indeed they are...
But i'm not sure the Passat is the same platform. You sure?
I thought it was common to the A6 and new A4.
I can't see how the VAG A4 platform can run a longnitudinal engine in a transverse platform configuration. May be wrong though...
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Just because it's the same basic platform doesn't necessarily mean it will be the same or handle the same.
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True...but it's no way of saying it will be much better either.
If the new S3 is anywhere near as good as the GTI golf or R32, it'll be good...
But Audi haven't traditionally made their models out handle the VW variant...the RS4 breaks the mould...I hope the S3 follows.