I'm referring to when you take off from a stand still as quick as you can WITHOUT wheel-spinning, or when you accelerate hard after shifting into 2nd or 3rd.
I'm not referring to when VSA is ON and the /!\ VSA light flashes like crazy over a rough surface. I'm talking about a clean acceleration in both circumstances -> when VSA is ON or OFF via the VSA switch.
When VSA is ON - Acceleration feels smooth and a bit limited at low-mid revs sometimes. Stability at the front wheels feels solid and smooth.
When VSA is OFF - Acceleration feels more rapid and more consistent, with the ECU outputting as much power/throttle as possible. There is less stability during acceleration and feels a bit unstable on occasion. BUT not to the extent that the wheels loose traction and chirp/wheelspin.
My theory is that VSA limits the electronic throttle at low-mid revs to provide better traction and smoothness during acceleration, hence less power.
If VSA senses a bit of wheel slip or instability (for instance when a rock or bump passes under one of the front wheels), VSA goes into action for a split moment and cuts a bit of the throttle, despite not seeing the /!\ VSA icon flash.
With my MY06 Euro 6MT, acceleration power is considerably improved when VSA is off. The difference is quite substantial, feeling like the engine gained an extra 20kw/20nm compared to when VSA is ON.
Do you notice this too?
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