Well my theory is that pressing "2" is not just switching to AUTO, will first trigger a close command and THEN will leave the ECU to take charge again (AUTO). So pressing the "2" button would do a CLOSE+AUTO even is you are at 7000 rpm... I will continue my testings next time.

 

Let me PM you as I dont want to hijack or go off topic in this thread.

 

If it’s working that way it’s either malfunctioning or you have the 2nd unit.

 

Assuming the following to be mostly correct(?):

PSE off, right after start-up and vacuum builds in the engine the valves close and remain there until about 4000 RPM
PSE on, after start-up the valves stay open to approximately 1800 RPM then close until 4000 RPM when they open again.

Hmmmm, I can't say that I have tried to make adjustments to the settings while the engine was above 4000 RPM, my eyes are on the road and hands are on the wheel!

Above 1800 RPM but below 4000 RPM I would expect that going from 1 to 2 would close the valves, I am sure that is what I experience.

 

With the 2nd unit you won't have to press the button each time you go above or below 4000 rpm. That's could be the deal with that version (completely stealth all the time, like an electric car). Anyway I'll see it in my next trip.

Right, so the test is fairly easy, pressing "2" above 4100 rpm...

 

This is on my list of things to try next time I drive the car.

 

My experience with PSE on is:

• 1st gear: valves closed between 1800-5000 RPM (unless you floored it starting below 1800 RPM, in which case they stay open throughout the rev range)
• 2nd gear: valves closed from 1800 RPM to somewhere in the 3700-5000 RPM range it seems, but there's no obvious sudden transition to open I could hear. Maybe the sound symposer and the exhaust valves open at different points.
• 3rd gear and up: valves closed between 1800-3700 RPM, clear crisp transition to full noise above 3700 RPM

 

What’s your experience with PSE off? People keep saying the valves open up at 4K which basically means the only difference between on and off is at idle which seems like a glorious waste of engineering to build a dual path muffler. I would expect their opening with PSE off to be based on RPM and throttle so above 4K they would open and close based on throttle since the quiet path is likely too restrictive for high RPM, high load airflow.

 

Found the perfect place (in the glovebox) to velcro the CG valve controller remote. I did program the homelink but wanted to keep the remote somewhere in the car.

 

I have been reading over what you are saying here, sounds like you want to have the valves closed above 4000 RPM?

If yes this is not a good idea, this creates too much back pressure and could cause engine damage, not even recommended by Cargraphic themselves.


I tried this a couple of times, I do not believe that I heard a change in the exhaust note caused by the valves closing, they remained open. What did your testing show?

 

Well wasn't something I wanted, it turned out that I just notice this when my fiance felt dizzy so I decided to take it easy for her and drive quiet back home. I know that is not a good idea have the valves closed under heavy load but now I understand why someone would like to have this feature.. you could still drive around 5000 calm (not like being in a trackday) but quiet too.

I made a short video at idle to see if others report the same behavior from their units:

• If I press 2 (AUTO) while PSE is OFF then valves closes as expected. Then If I turn PSE ON the valves opens also as expected, BUT if now I turn PSE to OFF the valves remains open. I must push 2 (AUTO) again to have them close. Also If I press 2 (AUTO) while PSE are ON valves remains open so the unit respect this state.

Also, when driving the valves remained closed after pressing 2 while PSE was OFF, even after reaching 4000 and 5000rpm. I wasn't flooring the car as I didn't wanted to create heavy load conditions.

Video

 

Hmmmm, I will try the button sequence you show at idle, not today though as it is pouring out and the car is dry and clean in the garage!

I find when cruising on the highway especially under light load the exhaust is almost silent, it would be really helpful to know exactly what the programming for the PSE was, everyone seems to have a bit different take on it including the RPM and valve positions!

 

Mine works as advertised. button 1 always open. Button 2 back to normal PSE operation. Maybe you plugged the unit into the wrong place when installing? There were two plugs in the same vicinity. I used the one closer to the rear of the car.

 

I plugged both cables, they made a nice click, I don't think it is possible to plug them wrong.

Button 1 always open (checked), but what I dicovered (at least with my unit) is that button 2 only allows you to close the valves once (if PSE is OFF), as I have shown in the video...
Have you tried opening and closing the valves several times at idle only by using the PSE button?.

 

But there are TWO original cables/plugs within an inch of each other... so I dont know what happens if you unplugged and pluged the CG unit into the wrong one (or if thats even possible). The correct plug as the one closest to the rear of the car when you were inside the engine bay. That said when I hit button 2 the valve operations revert PERFECTLY back to the OEM PSE program. The OEM PSE program when off, closes the valves up until about 4,000 rpm. When ON (PSE light ON) the valves are open at idle, then close when you are moving and revs are below 4,000... then open again at 4,000. The valves are NEVER closed above 4,000 rpm in ANY scenario. You may not be hearing whats going on properly? But if you think the valves are closed above 4,000 rpm then you have a faulty two way unit, installed the 3-way unit and you should remove it. You should also email Vlad as he is very responsive and helpful...