[Euro] Does your Euro accelerate quicker with VSA off?

[EuroDude]

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?

[yfin]

You need a new poll category - "I have time tested it and there is definately no difference".

I have tested rolling runs in a variety of gears with the Apexi RSM with G Sensor. Tests showed no difference with VSA on or off. 60-100, 80-120 - whatever you want to try.

Euroaccord13 has a similar set up - he probably has tested same but he is same release year. Anyone with a time device on the 06 model? It would not be surprising if Honda have altered the software on the 06 model.

With the VSA off you can get the tyres to chirp on a quick 2nd gear change - so of course traction control is going to activate in those circumstances.

[Suntzu]

Theres no difference IMO. Its in your head. If the switch was marked : VTEC ENGAGE button you would also think it was quicker if you pressed it...

[adammet04]

mine does seem to accellerate faster from stand still..or at the very least, loss of traction is easier to induce...i think its an interesting question because im fairly sure when i have VSA off the steering at most speeds is well lighter i guess is the right word..
20kw is a massive call imho for a button which is meant to handle stability..

[yfin]

mine does seem to accellerate faster from stand still..or at the very least, loss of traction is easier to induce

Yeah, that is why we need to focus on rolling runs in the dry in this thread I think. It is too easy for the traction control to activate from stand still.

[aaronng]

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.

In these 2 situations, you can lose traction and engage VSA. A better test would be to be cruising in 2nd gear at 4000rpm. You then floor the throttle with VSA on and off to see a difference.

With your two situations above, all you are asking is whether VSA works when it is turned on. LOL!

[EuroDude]

Well not necessarily from a standstill. It happens during a rolling start starting at low revs. Basically from 1000RPM to 4000RPM its more "aggressive".

And I'm quite certain its not just in my mind lol. It truly feels like there is a 10-20kw difference, otherwise I wouldnt have posted the thread


When the tyres chirp or wheelspin, thats another story off course. Im referring to clean acceleration.

[adammet04]

indeed but rolling runs slightly harder in auto's or are you talking about an accell from a given speed (eg 40km/h)

[yfin]

indeed but rolling runs slightly harder in auto's or are you talking about an accell from a given speed (eg 40km/h)

Yeah, just a given speed in a set gear that will not activate traction control (eg hold it with the tiptronic in 2nd at 50kph or something). Try VSA on and off.

As Aaron has pointed out - I think people are going to be confused by this thread question... It really needs to be a circumstance where VSA will not activate.

[yfin]

Well not necessarily from a standstill. It happens during a rolling start starting at low revs. Basically from 1000RPM to 4000RPM its more "aggressive".

And I'm quite certain its not just in my mind lol. It truly feels like there is a 10-20kw difference, otherwise I wouldnt have posted the thread

When the tyres chirp or wheelspin, thats another story off course. Im referring to clean acceleration.

At the next Sydney meet you and Aaron should test this out as it doesn't happen on the older models. I can assure you those of us with the car for 3 years would have noticed a 10-20kw difference during a rolling start

[adammet04]

Well not necessarily from a standstill. It happens during a rolling start starting at low revs. Basically from 1000RPM to 4000RPM its more "aggressive".

And I'm quite certain its not just in my mind lol. It truly feels like there is a 10-20kw difference, otherwise I wouldnt have posted the thread


When the tyres chirp or wheelspin, thats another story off course. Im referring to clean acceleration.

hmmm yeah fair enough...

[adammet04]

I suppose when VSA will not activate is when you dont see the symbol flashing like crazy ?