PSE ?

[Wausau 911]

On another forum it was stated the PSE automatically goes into quiet mode via the relay at speeds between 27 & 40 something. The manual doesn't state this and I have never noticed a sound change.

Is this true?

[Loren]

If the PSE is connected per factory/TSB instructions then it does indeed have a "quiet zone".

"If the PSE functions as intended, vacuum is present at the vacuum modulators at a speed of approx. 45 kmh / 28 mph to approx. 68 kmh / 42 mph."

I believe this is do to laws in a few European counties - most people in the US do the by pass and/or add a switch for full control of the PSE.

[Wausau 911]

Hoped you would chime in on this Loren, mine is OEM from build sheet so I guess it goes quiet as you stated above - thx

[creekman]

Loren, does that mean the PSE quiet mode activates at the 28-42 MPH and stays on "quiet" for speeds above the 28-42 MPH?

Thanks,

[JFP in PA]

Loren, does that mean the PSE quiet mode activates at the 28-42 MPH and stays on "quiet" for speeds above the 28-42 MPH?

Thanks,

No, the quiet zone is between 28 and 42 MPH per the euro sound spec requirements.

[creekman]

Loren,

Wow, was I misinformed on that, it really doesn't accomplish much then if you have only a 14 MPH window. I wonder how the system knows that? You

would think that it must have some RPM or speedometer input to be so precise. I guess any more baffling would hurt both the fuel mileage and

performance?

[JFP in PA]

Loren,

Wow, was I misinformed on that, it really doesn't accomplish much then if you have only a 14 MPH window. I wonder how the system knows that? You

would think that it must have some RPM or speedometer input to be so precise. I guess any more baffling would hurt both the fuel mileage and

performance?

The factory system has a link that reads the ground speed from the car's electronics that controls a relay which overrides the vacuum controls.

[golftime]

Loren,

Wow, was I misinformed on that, it really doesn't accomplish much then if you have only a 14 MPH window. I wonder how the system knows that? You

would think that it must have some RPM or speedometer input to be so precise. I guess any more baffling would hurt both the fuel mileage and

performance?

The 14 MPH window is when PSE is not active. By default, it is active at all other speeds. Additionally, PSE doesn't add or detract from performance or mileage. It only provides a more throaty exhaust note when compared to the standard exhaust.

[creekman]

Golftime, thanks for clearing that up. That sounds a lot more reasonable... Good information.

[zapna]

The cutout on my car was VERY noticeable. So I disabled it by following instructions on a DIY that I found, possibly on this site, that only required the bending over of a contact on a relay in the driver footwell. If you don't hear the cut out, then its probably already been done on your car.

Edited November 24, 2013 by zapna