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I thought I read somewhere that with the heat generated in that area, even the rubber hoses have experienced heat damage. You may want to get some wire to hold that hose up, the zip tie may melt.
Any idea on change in torque/hp curve? No doubt, Porsche knows their flat 6 better than others, and purposely designed it to operate with the open/closing.
I thought I read somewhere that with the heat generated in that area, even the rubber hoses have experienced heat damage. You may want to get some wire to hold that hose up, the zip tie may melt.
I think the zip tie will be okay. I guess we'll see. It won't hurt anything if it melts.
Any idea on change in torque/hp curve? No doubt, Porsche knows their flat 6 better than others, and purposely designed it to operate with the open/closing.
I was trying to take notice of it, but my butt dyno cannot detect a difference.
Any idea on change in torque/hp curve? No doubt, Porsche knows their flat 6 better than others, and purposely designed it to operate with the open/closing.
Originally Posted by Money2536
I was trying to take notice of it, but my butt dyno cannot detect a difference.
Not saying my butt dyno is better than yours but FWIW, I felt that torque in the low rev range was diminished when I did this mod and posted a DIY (not as nicely done as yours) about it a couple of months ago. I ended up switching things back. BTW, I used wire instead of plastic to tie things off because of the heat involved in that area.
The PSE is fairly sophisticated and IMO simply blocking the vacuum source negates some of the other features built into the system. For anyone who is interested, this is what the Porsche tech intro docs have to say about it. Regardless, well done vid and beautiful car!
Switchable exhaust flaps
Like its predecessor, the 911 GT3 (991) has a function for increasing torque in the
middle rpm range. This function is not activated by pressing a SPORT button as was
the case for the previous model, but instead using the button with the twin tailpipe
symbol (1) in the center console. When this button is pressed, the torque is
increased in the middle rpm range. The exhaust backpressure in the variable
exhaust system is additionally reduced and the gas cycle is improved, resulting in a
noticeable boost in torque in the rpm range between approximately. 3,000 and
4,000 rpm. The torque levels are increased by between approximately 22 and 26 ft.
lb. (30 and 35 Nm). The maximum torque of 325 ft. lb. (440 Nm) at 6,250 rpm
remains unchanged.
The switching point of the exhaust flaps depends on the load and engine speed. As
on the 997 GT3 II, the switching point from closed to open at full throttle is 3,200
rpm (exhaust flap button (1) pressed) and 4,000 rpm (exhaust flap button (1) not
pressed).
12-14-2014, 07:00 PM
