Active Exhaust

[SVTinAR]

This is going to show my age and granny driving habits. I commute to work 3 days a week in my GT350 and in the mornings I leave the exhaust in quiet mode and I just quietly and benignly cruise to work, listening to news and waking up. Coming home in the afternoon I typically open up the exhaust and drive a bit more sporty to entertain myself. Well, this morning while quietly cruising along a freeway access road another car pulled out in front of me and just crept along, so I pulled into the other lane to pull around and realized the two lanes were merging pretty quickly - requiring that I give the car more throttle (I think in 4th) to pull around. As I did so the exhaust opened up with a roar. First time I've experienced that - exhausts opening up in quiet mode under throttle. I experimented a couple more times and each time the exhaust opened up on their own.

Is this a normal operation pattern? A bit embarrassed to have driven the car for a year and never accelerated hard enough on my morning commute to have discovered this.

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[loco_GT350]

Yes, in quite mode if you step on it the valves will open. I can remember at what RPM this happens at but completely normal.

 

[SVTinAR]

OK - good to know. Something else I didn't know that I didn't know. Like your car - looks like a twin of mine.

 

[key01]

Ha! Normal. I accelerated with my wife in the car this weekend and she said “did you put the exhaust in LOUD MODE?” Lol

 

[GT_Dave]

On my car in the morning while the engine is still cold my exhaust seems open up much sooner at about 1/3 throttle at any RPM. I am surprised you haven't experienced this before in normal driving. Once it warms up it takes half to 2/3 throttle depending on what gear I am in.

 

[SVTinAR]

Will it also over-ride and open up in 6th? I probably can't test that out around here.

 

[galaxy]

I think it’s an engine load/throttle position thing vice a rpm trigger point. And no, I wouldn’t floor it in 6th. That’ll bog the engine at just about any speed, LOL. It’s of no harm, but also of no use.

 

[MikeMM]

I seem to remember hearing something like 2/3 throttle will open up the valves regardless of the gear selected, to include 6th. It's not super noticeable in 6th, but i can confirm they open if you floor it.

 

[SVTinAR]

Yeah, 6th gear acceleration is why I said I probably can't test it around here. Might have to be up around 110 or so to be able to test out 6th. Too much interstate truck traffic around here.

 

[GT_Dave]

In normal mode the active exhaust will not open up under any circumstances in sixth gear.

 

[ameapm2000]

I think the valves open after 3500 rpm.

 

[SVTinAR]

In normal mode the active exhaust will not open up under any circumstances in sixth gear.

OK - no need to try to test that out then.

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