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PSE install Questions


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I've done a 997.1 PSE install, but haven't got to the electrical bit yet which will be "part 2".

Going through the Technical Information on the electrical connection to the DME, I need to tap onto A8 and connect to C14.

Before I get into the actual DME connectors I was wondering if the the pin numbers are clearly marked on each connector.

What threw me a bit off was this Boxster PSE install on Planet 9 http://www.planet-9.com/reviews/miscellaneous/p294-retrofitting-factory-pse-and-overide-switch-porsche-sport-exhaust-pse.html .

Grey/Green C14 needed to be connected in this case as well. If you look at his connector it looks like he added the Grey/Green wire to C17 instead, yet he mentions he needs to wire to C14.

Anyone done the 997.1 PSE install can shed some light on this?

Also, how difficult was it to route the wire through the rubber grommet on the right side of engine bay to the car's interior? Any tips?

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The pin numbers are on the connector shell, but are very small, you may need a magnifying glass to read them.

The grommet to pass the wire from the engine compartment to the cabin in under the carpet and sound absorbing material in the rear package tray under (if installed) the Bose subwoofer. It is a solid grommet that you need to cut an "X" in to pass the wires.

The 997 PSE is essentially identical to the 996 PSE, except the the muffler baffle switching signals. On the 997 the stock setup has the switching 12V+ coming from the DME which puts it in quiet mode from 25-45 MPH (or around those speeds). Some cars have a manual override switch, but most do not.

But the actual vacuum solenoid that controls the muffler baffles is just a 12V switch. Some folks have simply wired the muffler baffle vacuum solenoid to an on/off switch and to a 12V+ switched circuit so that they can quiet the exhaust on demand instead of the DME deciding. This is similar to the 996 PSE switching logic. Of course if you leave the Vacuum switch disconnected, then the PSE is in "Loud" mode all the time.

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The 987 and 997 use the same rear DME , the DME switches to earth on pin C14 and D17, so the PSE needs to have a live feed to one side of the solenoid and connected to the DME (ground) on the other. I used the 997 and 987 PSE install instructions to determine which pins needed to be connected. It depends on the model year of your car as to which pin is used , C14 if its 2005 and D17 if its 2006 or later. I believe the differences are around whether the PSE control wiring is present in the engine bay (ie brown plug that connects to the PSE solenoid is pre wired back to D17 on the DME)

The dashboard switch for PSE activation comes either from the sport button (if sport chrono is already fitted) or from a separate PSE button for which you need a mini wiring loom and new switch panel with the button . In either case the input to activate the PSE goes into chamber D6 on the DME plug. This input in turn activates an internal relay which switches either C14 or D17 to ground so making the PSE active or inactive. C14 and D17 are automatically switched by internal logic between 30 and 40 mph so the PSE becomes "quiet" to satisfy european noise regulations.

A10 and A11 are the switch panel. One side of the switch is the input to the DME ( a pulsed input from the switch, the DME does the latching control of the output C14/D17 ) the other is the LED that illuminates when the button is active. As a result there is no way to replicate the switch control into the DME using a simple latching switch , you have to bypass the DME control and install a dedicated 12V circuit , direct to the PSE solenoid.

If you dont have sport chrono (or the PSE mini loom and new switch panel) you need to find a switched live supply to feed the PSE solenoid and fit a simple pushbutton to activate it. If you do not use a switched 12v supply (most of the wiring loom is actually permanent 12v on the 997/987) then you run the risk of flatenning the battery if you leave the PSE switch depressed (ie in quiet mode) as the solenoid constantly draws power.

If you subscribe to the forum (become a contributor) you get access to all the tech bulletins including the one for the 997 PSE install. The install on planet 9 you refer to was written by myself . The picture of the grey plug is not the C plug , its just for reference only , hence C14 is populated in the pic. Sorry for any confusion

Edited by berty987
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Hi Berty,

Thanks for the clarification! Indeed, the grey connecter with the populated C14 threw me off.

I am a contributing member and have the TI for the 997 PSE install. Thankfully, my 997 has Sport Chrono, so I only have to wire up to the DME and no additional wiring to the switch is necessary. However, before I get there, is C14 clearly marked on the C plug? That is basically my only question, other than how difficult is it to get through that large rubber grommet in the engine bay. I've done the 996 install before, as Orient pointed out, but that is only through the small rubber grommet, quite manageable, compared to the large one tucked away in the corner of the engine bay of the 997 that the wire is supposed to go through.

Thanks in advance.

The 987 and 997 use the same rear DME , the DME switches to earth on pin C14 and D17, so the PSE needs to have a live feed to one side of the solenoid and connected to the DME (ground) on the other. I used the 997 and 987 PSE install instructions to determine which pins needed to be connected. It depends on the model year of your car as to which pin is used , C14 if its 2005 and D17 if its 2006 or later. I believe the differences are around whether the PSE control wiring is present in the engine bay (ie brown plug that connects to the PSE solenoid is pre wired back to D17 on the DME)

The dashboard switch for PSE activation comes either from the sport button (if sport chrono is already fitted) or from a separate PSE button for which you need a mini wiring loom and new switch panel with the button . In either case the input to activate the PSE goes into chamber D6 on the DME plug. This input in turn activates an internal relay which switches either C14 or D17 to ground so making the PSE active or inactive. C14 and D17 are automatically switched by internal logic between 30 and 40 mph so the PSE becomes "quiet" to satisfy european noise regulations.

A10 and A11 are the switch panel. One side of the switch is the input to the DME ( a pulsed input from the switch, the DME does the latching control of the output C14/D17 ) the other is the LED that illuminates when the button is active. As a result there is no way to replicate the switch control into the DME using a simple latching switch , you have to bypass the DME control and install a dedicated 12V circuit , direct to the PSE solenoid.

If you dont have sport chrono (or the PSE mini loom and new switch panel) you need to find a switched live supply to feed the PSE solenoid and fit a simple pushbutton to activate it. If you do not use a switched 12v supply (most of the wiring loom is actually permanent 12v on the 997/987) then you run the risk of flatenning the battery if you leave the PSE switch depressed (ie in quiet mode) as the solenoid constantly draws power.

If you subscribe to the forum (become a contributor) you get access to all the tech bulletins including the one for the 997 PSE install. The install on planet 9 you refer to was written by myself . The picture of the grey plug is not the C plug , its just for reference only , hence C14 is populated in the pic. Sorry for any confusion

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After re-reading your post, I am trying to differentiate between the momentary (non-latching) input of D6 and A10/A11, which you have mentioned are responsible for internal DME latching of the PSE solenoid earth wire.

Also, another question that comes to mind is, if I go the conventional swicth way, using a switched 12V as power while controlling the earth to trigger the PSE solenoid, is there a part number to nice looking conventional switch that has an exhaust logo that I could use? (Porsche or even other car brand)

The 987 and 997 use the same rear DME , the DME switches to earth on pin C14 and D17, so the PSE needs to have a live feed to one side of the solenoid and connected to the DME (ground) on the other. I used the 997 and 987 PSE install instructions to determine which pins needed to be connected. It depends on the model year of your car as to which pin is used , C14 if its 2005 and D17 if its 2006 or later. I believe the differences are around whether the PSE control wiring is present in the engine bay (ie brown plug that connects to the PSE solenoid is pre wired back to D17 on the DME)

The dashboard switch for PSE activation comes either from the sport button (if sport chrono is already fitted) or from a separate PSE button for which you need a mini wiring loom and new switch panel with the button . In either case the input to activate the PSE goes into chamber D6 on the DME plug. This input in turn activates an internal relay which switches either C14 or D17 to ground so making the PSE active or inactive. C14 and D17 are automatically switched by internal logic between 30 and 40 mph so the PSE becomes "quiet" to satisfy european noise regulations.

A10 and A11 are the switch panel. One side of the switch is the input to the DME ( a pulsed input from the switch, the DME does the latching control of the output C14/D17 ) the other is the LED that illuminates when the button is active. As a result there is no way to replicate the switch control into the DME using a simple latching switch , you have to bypass the DME control and install a dedicated 12V circuit , direct to the PSE solenoid.

If you dont have sport chrono (or the PSE mini loom and new switch panel) you need to find a switched live supply to feed the PSE solenoid and fit a simple pushbutton to activate it. If you do not use a switched 12v supply (most of the wiring loom is actually permanent 12v on the 997/987) then you run the risk of flatenning the battery if you leave the PSE switch depressed (ie in quiet mode) as the solenoid constantly draws power.

If you subscribe to the forum (become a contributor) you get access to all the tech bulletins including the one for the 997 PSE install. The install on planet 9 you refer to was written by myself . The picture of the grey plug is not the C plug , its just for reference only , hence C14 is populated in the pic. Sorry for any confusion

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Unfortunately there is no readilly available switch I am familiar with. The switch you see in my post was self made along with the bracket , I made a few kits up as spares to sell to anyone that wanted to save the time and hassle of making their own. D6 is a pulsed input from the switch panel. A11 is feedback from the DME to illuminate the PSE switch. When you remove the plugs from the DME its easy to see which chamber is C14 if you look closely at the plug the chambers are labelled at each end eg 11 and 20. Just make sure you remove the correct plug and carefully SLIDE the block connectors from the cover before trying to add any new cables. If you decide not to use the DME to control the PSE you can wire directly from a 12V switch to the PSE actuation solenoid , the other side can connect direct to ground/ earth.

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Indeed C14 was very clearly marked! Thanks for the help.

Unfortunately there is no readilly available switch I am familiar with. The switch you see in my post was self made along with the bracket , I made a few kits up as spares to sell to anyone that wanted to save the time and hassle of making their own. D6 is a pulsed input from the switch panel. A11 is feedback from the DME to illuminate the PSE switch. When you remove the plugs from the DME its easy to see which chamber is C14 if you look closely at the plug the chambers are labelled at each end eg 11 and 20. Just make sure you remove the correct plug and carefully SLIDE the block connectors from the cover before trying to add any new cables. If you decide not to use the DME to control the PSE you can wire directly from a 12V switch to the PSE actuation solenoid , the other side can connect direct to ground/ earth.

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  • 4 weeks later...

Hello Berty,

Thanks a lot for your detailed explanation regarding PSE installation.

I recently replaced the stock exhaust mufflers with used PSE mufflers. As the supplier was reluctant to remove the hose, wiring harness, valves, etc.from his 997, my PSE is now on permanent 'loud' mode. While I am happy with the sound, not so my neighbours. I now need to install a 12v switch to control the activation of the PSE.

To do so, it appears that I first need to purchase all the necessary change-over valve (also known as solenoid?), wiring harness, hose, etc and have them properly installed in accordance with the relevant TSB (I am a contributing member).

Then I need to run a switched wire from the fuse box to the change-over valve. There is no need to connect the wires to the DME. Is my understanding correct?

Do you still have the spare switch. If so, I would like to buy it from you. Is PayPal acceptable?

Thanks again.

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