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beejay993
Trainee


Joined: 26 Dec 2007
Posts: 71



PostPosted: Wed Dec 12, 2018 8:52 pm    Post subject: PSE “auto shut off” disable Reply with quote

Guys, I’m hoping someone will be able to point me in the right direction for some technical advise on disabling the auto cut off on the PSE system between 30-45ish mph. I seem to recall I have to pull a relay or cut some cables ? I’m hoping there is a solution that allows the PSE valves to stay open through the full rev range and then switch off fully when required from the switch on the dash. Thanks in advance
 
  
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6490
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Wed Dec 12, 2018 8:56 pm    Post subject: Reply with quote

You need to disconnect the wire which goes to the speedo signal.
Grey wire with pink tracer.




MC
 
  
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asterix_the_gaul
Suzuka


Joined: 20 Dec 2008
Posts: 1167
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Thu Dec 13, 2018 1:57 am    Post subject: Reply with quote

There are 3 ways of doing this, all essentially doing the same thing, removing the speed signal, there's the wire cut as MC detailed, the diode cut which is well covered with pictures On this and other forums and the ultimate 2 second job, the terminal bend.
I had only ever heard of the diode cut before..

"Factory instructions and factory fit exhausts included a speed dependent cut out. The relay for the PSE has a terminal fed with the speed signal (Terminal A), remove the relay and carefully bend the terminal 90 degrees so it wont plug into the board and refit the relay. No more speed dependent cut out......

Alternatively, remove the relay board and take out the speed signal wire (the pink one) from the relay plug - takes longer though."

I thought it's revs that trigger the valve opening not speed ? Might have to check that at some length in some tunnels
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1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 
  
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6756
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Fri Dec 14, 2018 8:23 pm    Post subject: Reply with quote

996 PSE is speed dependent. I think it shuts off between 30 and around 50mph.

Auto shut off easily disabled with the ‘diode snip’. Have a search for a thread by user GT4 if memory serves.

When I did it I snipped one leg of the diode, just in case it ever needed to be reversed.

Also remember to operate the switch a few times each journey or the valves may seize.
_________________
"911- the guilt-free supercar"

Current: 2003 C4S Coupe, seal/black

Ex: '02 C4S Coupe, '96 993 Targa, '88 Carrera Sport Coupe
 
  
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beejay993
Trainee


Joined: 26 Dec 2007
Posts: 71



PostPosted: Sun Dec 16, 2018 12:35 pm    Post subject: Reply with quote

Thanks guys, I’ve carried out a search but I cannot find any type of idiots guide (which I would need 🤣) to pull the relay etc. Does anyone have a link to the best source for this mod ? Thanks in advance
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993 C4s - Midnight blue
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pzero
General
General


Joined: 18 Jul 2010
Posts: 5020
Location: London


PostPosted: Sun Dec 16, 2018 1:05 pm    Post subject: Reply with quote

beejay993 wrote:
Thanks guys, I’ve carried out a search but I cannot find any type of idiots guide (which I would need 🤣) to pull the relay etc. Does anyone have a link to the best source for this mod ? Thanks in advance


http://911uk.com/viewtopic.php?t=66202&postdays=0&postorder=asc&start=0
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