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Remove PSE cutout in 2 minutes, no tools required

Eddy
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1080iAddict Member

1080iAddict

Posted
Posted
Seems like this mod was written up for the 996 (even though its here in the 996/997 section).  Has anyone done this mod on a 997 yet?

Unfortunately on the 997 the sound cutout is done by the DME CPU so there is no analog relay to bypass.

OK then. Can you whip me up a DME firmware upgrade? B)

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Loren
Loren

As I recall it is TTL.

Posted Images

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Orient Express Member

Orient Express

Posted
  • Moderators
Posted
Seems like this mod was written up for the 996 (even though its here in the 996/997 section).  Has anyone done this mod on a 997 yet?

Unfortunately on the 997 the sound cutout is done by the DME CPU so there is no analog relay to bypass.

OK then. Can you whip me up a DME firmware upgrade? B)

Sure thing, no problem, can I borrow your PST for an evening? I'll whip up a patch in no time at all.

:thumbup:

  • 4 months later...
havf8h Member

havf8h

Posted
Posted

Ok... I think I read on here that if you just remove the relay than everything will work fine. Do you have to cut the diode and so on and put the relay back? If I keep the relay out does that do anything bad to anything else on the car?

I have an 04' C4S with the PSE.

Thank you.

  • 2 months later...
ntrylvl Member

ntrylvl

Posted
Posted

I did this mod and it works as advertised. No more wimpy "cutout" and I couldn't be happier. All of my neighbors are fellow Porsche-philes, so I don't think they mind!

  • 5 weeks later...
  • 3 months later...
Bernd_911 Member

Bernd_911

Posted
Posted

Did the mod today.

I was afraid that I destroy the PCB, because it is so small, but finally it worked out.

Thanks a lot for the DIY Mod.

no more silence between 40 and 70 kph, apart from the Police being around and for the German TÜV.

Regards

Bernd

  • 2 weeks later...
Carrera24 Member

Carrera24

Posted
Posted (edited)
Did the mod today.

I was afraid that I destroy the PCB, because it is so small, but finally it worked out.

Thanks a lot for the DIY Mod.

no more silence between 40 and 70 kph, apart from the Police being around and for the German TÜV.

Regards

Bernd

does this mod still work on a '04 or '05 996?

great contribution anyway thx!

Edited by Carrera24
  • 4 weeks later...
don9724 Member

don9724

Posted
Posted
TD,

Since we only use an "input" signal, you don't have to worry, there is no output on the relay. (towards the speedo signal) The relay on your car will be differenct, the circuit also. ( ending 01 , 02 and today 03) . As long as you cut out the diode going to pin 1 of the relay, your fine.

If you want to "undo" the mod, just walk in a radio shack shop, ask for 1N4148 diodes ( probably 10 ct/pcs or less) and solder the diode in place.

Best, Eddy

I will have to say I was a little hesitant, but what the heck, you only go around once! LOL It was a 5 minute job at the most. Thanks so much for this excellent post!!

Don

  • 1 month later...
  • Admin
Loren Member

Loren

Posted
  • Admin
Posted
Im sure this is a stupid question but do I need to disconnect the cars battery before taking the relay out?

Cheers

Paul

No - just remove the key from the ignition. Just remove the relay and work on the relay out of the car. Then plug it back in.
sheldon Member

sheldon

Posted
Posted

Im sure this is a stupid question but do I need to disconnect the cars battery before taking the relay out?

Cheers

Paul

No - just remove the key from the ignition. Just remove the relay and work on the relay out of the car. Then plug it back in.

cool, thanks

  • 4 weeks later...
pwafer Member

pwafer

Posted
Posted

Just done the mod... had a blue diode not orange too.

Took all of 5 minutes, very simple... hardest part was prising the relay open.

I just snipped one leg and the used a piece of heat shrink to insulate, this should meen I could revert back to stock with a quick blob of solder.

Anyway.... thanks everyone for the MOD help.... the 25-45mph overide to quiet was getting on my nerves.

Cheers

Paul

:thumbup:

pmjt Member

pmjt

Posted
Posted

Eddy,

Many, many thanks for this superb mod :D As others have observed, the longest part of the project was getting the case off the relay :lol:

Just taken it down the road and enjoyed my GT3's 'voice' at the mid-range where, because of British roads, it spends most of its time - superb mod - thanks again.

For those who are interested, I use the part no. Loren gave and ordered a replacement relay just in case - £51.00 and will be here tomorrow.

Philip

  • 3 weeks later...
Philip1972 Member

Philip1972

Posted
Posted
Eddy,

Many, many thanks for this superb mod :D As others have observed, the longest part of the project was getting the case off the relay :lol:

Just taken it down the road and enjoyed my GT3's 'voice' at the mid-range where, because of British roads, it spends most of its time - superb mod - thanks again.

For those who are interested, I use the part no. Loren gave and ordered a replacement relay just in case - £51.00 and will be here tomorrow.

Philip

Hi all. I just had the PSE fitted and want to do this mod BUT..there is no relay with that part number or words on in my car. It a 1999 C2. Any ideas?

Thanks for any help

Phil

Philip1972 Member

Philip1972

Posted
Posted
Hmm... what is the part number on your relay?

There are 2 of the larger relays with the following part numbers. The first one is the one highest up on the board

996 615 117 00

996 615 103 00

Philip1972 Member

Philip1972

Posted
Posted
The relay has to be part number 996.618.980.01 or 996.618.980.02 or 996.618.980.03.

You need to find the right relay.

Loren thank you. I pulled another plastic cover down and there was another relay-the one that I needed! All done now and very happy!!

Thanks again.

Phil

  • 3 weeks later...
Hilbert Transform Member

Hilbert Transform

Posted
Posted

Great Thread. I've just carried out the mod and I'm very pleased. One question though, does anyone know if the dash switch can be modified to default to quiet mode rather than loud mode? Would this simple be a case of swapping terminals in the dash switch?

Thanks,

Hilbert

  • Admin
Loren Member

Loren

Posted
  • Admin
Posted
Great Thread. I've just carried out the mod and I'm very pleased. One question though, does anyone know if the dash switch can be modified to default to quiet mode rather than loud mode? Would this simple be a case of swapping terminals in the dash switch?

Thanks,

Hilbert

That will likely work - but I haven't tried it.
  • Moderators
Orient Express Member

Orient Express

Posted
  • Moderators
Posted
Great Thread. I've just carried out the mod and I'm very pleased. One question though, does anyone know if the dash switch can be modified to default to quiet mode rather than loud mode? Would this simple be a case of swapping terminals in the dash switch?

The way that the "quiet" mode works is that the vacuum switch needs to be energized to allow vacuum to close the bypass flap in the muffler. The default mode (no vacuum) for the mechanical bypass flaps in the mufflers is open.

In order for the mufflers to be in the quiet mode as default, the PSE relay would need to be powered on at all times, and then powered off to make it noisy. This is the opposite of the current relay configuration. The PSE relay is a "normally off" relay, and it would need to be replaced with a "normally on" relay.

Reversing the power connections at the switch would not do anything.

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