PSD Question - FIXED
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From: Gatineau, Québec, Canada
PSD Question - FIXED
Hi,
Can anybody tell me what is the metal part beside the plastic reservoir with the inscription WARNING in red in this pic please.
Just noticed it is leaking.
Can anybody tell me what is the metal part beside the plastic reservoir with the inscription WARNING in red in this pic please.
Just noticed it is leaking.
Last edited by Bertrand Daoust; Aug 4, 2010 at 08:58 AM.
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From: Bloomfield, MI
Not sure but it could be a "High Pressure" reserve, it is all part of the PSD pump, the warning is for "High Pressure" break fluid, that is what is used in the system.
If you do a search on PSD, there area few writes up on how it all works.
If you do a search on PSD, there area few writes up on how it all works.
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Bertrand........you should know that to properly bleed the PSD system you need a special tool to plug into the diagnostic port and run the PSD pump remotely.
Not sure who has one in Eastern Canada......... you need the Porsche hammer or JDS spanner or Theos Diag System.
Not sure who has one in Eastern Canada......... you need the Porsche hammer or JDS spanner or Theos Diag System.
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Bertrand........you should know that to properly bleed the PSD system you need a special tool to plug into the diagnostic port and run the PSD pump remotely.
Not sure who has one in Eastern Canada......... you need the Porsche hammer or JDS spanner or Theos Diag System.
Not sure who has one in Eastern Canada......... you need the Porsche hammer or JDS spanner or Theos Diag System.
Here's the best write-up out there:
http://928oc.org/journal/psd1.pdf
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Yep, that's the pressure accumulator alright. I had all my fluids changed about 7 years ago and a month later as I was parking the car it exploded. Don't know why, but they were virtual unobtainium back then (about $1000 new) with no used ones available. They disconnected the PSD and put a bolt somewhere in the rear end which gives me either an open differential??? or a fixed??? (I really don't know.) I found another complete used PSD system a couple years ago and have not gotten around to installing/testing to see if its any good but I'll get a "roundtuit" this year. I guess though, really, that I have not missed the PSD enough to know the difference with or without it today.
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One interesting observation about PSD. It seems that if driveshaft joints are just exactly right kind of worn, not totally failing yet but badly worn, PSD computer will go mad and apply full 100% lock on tight turns no matter how slowly car is driven. This causes car to behave very oddly, almost like offroad vehicle.
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One interesting observation about PSD. It seems that if driveshaft joints are just exactly right kind of worn, not totally failing yet but badly worn, PSD computer will go mad and apply full 100% lock on tight turns no matter how slowly car is driven. This causes car to behave very oddly, almost like offroad vehicle.
The only thing I can see happening is that the PSD is being applied to affect change in the wheel spin, and if the change isn't observed from the sensors, the PSD goes into a higher pressure mode. I guess that could be it.
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Its probably some kind of oscillation which keeps on feeding itseft until 100% lock is achieved, which will happen very quickly. Probably requires very specific conditions. Problem went away totally right after shafts were changed. Old shaft had been apart during winter and ABS teeth were clean in old shafts so it wasn't caused by them. Joints were just too worn out. Everything was and is in ok condition in this particular ex automatic GTS which now has 5sp from '90 GT.
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Bleed the system and change the reservoir.
The accumulator is pretty high pressure.
Fluid looks dirty.
The accumulator is pretty high pressure.
Fluid looks dirty.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."