3.3TT When does the bi-modal valve actually open?

[keplaffintech]

I don't believe the bi-modal exhaust switches with the mode. In this video you can hear almost no difference between comfort and sport:

Watching other videos, it seems the valves only open above a certain RPM and when on throttle. They close when backing off, and when at low RPM (idle etc). Watch here:

Can anyone confirm the logic that determines when the valves open on the new bi-modal exhaust?

 

[D.J.]

Is this the truth table?

Electronic Variable Exhaust

I recently purchased a '22 GT1 and noticed that the valves aren't opening when in Sport mode. The car sounds pretty much the same as all other modes. Is there something I am missing here? Do they open up at higher RPM or should they open at idle because they definitely look shut in Sport mode.

stingerforum.org

 

[keplaffintech]

Is this the truth table?

I think this applies only to the Australian developed Bi-modal which was introduced for the 2018-2020 models. This was a custom system that was integrated to the ECU by the dealer.

The stock bi-modal that comes on the new MY21-22 models seems to behave differently.

 

[ShannonC]

I think this applies only to the Australian developed Bi-modal which was introduced for the 2018-2020 models. This was a custom system that was integrated to the ECU by the dealer.

The stock bi-modal that comes on the new MY21-22 models seems to behave differently.

Yes the "truth table" only applies to the V1 and V2 AUS systems. The latest system, by all accounts, is nowhere near as good.

 

[Danila @gt2ck]

Hello!

Is there anywhere I can find detailed information with the explanation on how the Bi-Modal variable exhaust on my 2021 3.3 (KDM spec) works in different drive modes and throttle application.
I would really appreciate if someone could share any sources where it says that the operation of the exhaust valves is actually integrated into the ECU from factory.