How much faster for 0-100km if changing rft to performance tires

[335e91 3]

Just wondering if the time would drop half a second after changing to some performance tires

[Driftit 2125]

Possible. All dependent on grip levels. If there was traction loss with the old tyres and none with the new etc...

With traction control on the vehicle may have limited power if the older tyres were starting to loose grip upon acceleration. This would increase 0-60 times.

[Matth5 471]

Massive traction difference when I replaced my Bridgestone RFT tyres with Goodyear Eagle F1s so that alone will make it faster.

Even on dry road the runflat tyres had a lot of wheelspin.

There is also the fact RFT tyres are heavier so it's a weight reduction, theoretically that should help acceleration and fuel economy but not sure it'll be enough that you can measure it.

[M3AN 4017]

Half a second? Unlikely.

Assuming you're referring to the 335 and not the 323 then isn't the 335 already a ~5 second car? Even fabulous street tyres ain't going to make it a ~4.5 second car.