[worf]

should an S4 auto box kick down at different times, just depending on the speed of pressing the throttle, or does the throttle pedal just have to be at a certain point ?

I have driven one 928 Auto that I know was properly set-up. It was a ‘94 though. It was lively. But, IIRC ‘94+ has extra stuff pre-‘94 doesn’t.

[torfin]

Continuing to clean up my 1989 928GT. I've got the familiar dragging brakes problem. They drag after being applied, but release completely after a 30 minute wait. I've seen this problem before, and on that car it was ancient brake lines swelling on the inside. The current ones look original. I'm aware that this problem often is caused by a failing master cylinder, but I think I'll try new brake lines first.

My question is what to buy? First, are 928GT brakes identical to the S4 ones? I see original Porsche lines, ATE, Fabian-Spiegler, HEL, and some woven stainless by Troutman. I have no urge to put on genuine Porsche parts unless they are actually better, so what to buy? Are the aftermarket parts as good or better than the Porsche ones? What are people happy with?

[worf]

First, are 928GT brakes identical to the S4 ones?

Yes.

I see original Porsche lines, ATE, Fabian-Spiegler, HEL, and some woven stainless by Troutman. I have no urge to put on genuine Porsche parts unless they are actually better, so what to buy? Are the aftermarket parts as good or better than the Porsche ones? What are people happy with?

<shrug> I use ATE lines. IIRC, unless you get the stainless lines, the ATE rear lines are only available from Porsche. Or, might be the fronts, I forget.

Since the OE ATE lines are good for 25-30 years, I don’t worry about choosing.

[h2pmr]

plastic elbow that goes in the bottom of the aux air filter housing, is there a part number for it or does it only come with the fan housing?
cheers
Phil

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[Gary Knox]

should an S4 auto box kick down at different times, just depending on the speed of pressing the throttle, or does the throttle pedal just have to be at a certain point ?

I have driven one 928 Auto that I know was properly set-up. It was a ‘94 though. It was lively. But, IIRC ‘94+ has extra stuff pre-‘94 doesn’t.

Yes, I've owned both of these last two models. The '94 and '95 cars have about a half dozen items that are different than the previous S4/GTS cars. Two of them are a different automatic shift module for better shifting performance, and a cabin filter in the HVAC system. I've forgotten the others!! IF I recall correctly, the improved shift pattern module is available for retrofit to '87-'93 cars

PS: I should have remembered the most important mod in '94 - forged connecting rods, replacing cast ones on the earlier GTS's.

Gary

[worf]

plastic elbow that goes in the bottom of the aux air filter housing, is there a part number for it or does it only come with the fan housing?

AFAIK, it has no part number. You can get a new one if you get a new fan shroud. If you can get a new fan shroud.

[h2pmr]

anybody know the part number of the engine lifting shackle at the rear of the engine ?
my PET only lists 92811317302 x2 but they are different
pictured on the left is the front one with the earth mounting nut and the other one is the rear shackle
cheers
Phil

20240811_112339.jpg

[worf]

anybody know the part number of the engine lifting shackle at the rear of the engine ?
my PET only lists 92811317302 x2 but they are different
pictured on the left is the front one with the earth mounting nut and the other one is the rear shackle

I looked at a 20-year old parts book. If they ever had different part numbers the difference fell off the edge of the world prior to 2005.

[h2pmr]

thanks for looking Dave, have put them on ebay, somebody somewhere might want them someday.
cheers
Phil

[h2pmr]

RHD washer bottle filler neck, end with the grommet is where the actual washer bottle top goes into and the other end goes onto the washer bottle
is PCG18128650 what you get now, just an unmolded piece of hose for £45?

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20240822_202143.jpg

[h2pmr]

i am 99% sure that pictured below is a 92850440700
i removed it from an 89 i broke years ago and just found it in a box
looks like from the rear of the vehicle on PET but anybody know what / where it actually mounts?
cheers
Phil

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20240914_123511.jpg

20240914_123519.jpg

20240914_123533.jpg

[worf]

i am 99% sure that pictured below is a 92850440700
i removed it from an 89 i broke years ago and just found it in a box
looks like from the rear of the vehicle on PET but anybody know what / where it actually mounts?

It’s a bracket that holds the rear cover to the rear body and provides for mounting of a diagonal bracket from the junction to the bottom-most part of the cover. All this at the wheel well. Stick your head between the rear-wheel and the cover and you should see it. I don’t remember if it’s above or below the lip of the cover.

I’ll see about posting pictures later.

[h2pmr]

thanks Dave, when you say the cover do you mean the wheel arch plastic covers ?
had a look on the 87 but could not see it.
cheers
Phil

[worf]

thanks Dave, when you say the cover do you mean the wheel arch plastic covers ?

No. The rear bumper cover. Or in modern terms: The rear apron.

Sorry for the delay, I kept meaning to find a picture but kept getting distracted.

Below, you will see the part mounted. In the picture the part is cadmium plated.

[h2pmr]

many thanks Dave
ah just to mount the PSD shield to, wondered why PET has it 90-95 only, makes sense now .
and can now update my ebay listing description of it
cheers
Phil

[h2pmr]

and have just borrowed the picture for my ebay listing, if thats ok.
UK ebay listing number 266990455872
cheers
Phil

[worf]

and have just borrowed the picture for my ebay listing, if thats ok.

Next time ask and I will provide a more-properly edited version.

[h2pmr]

90-95 small piece of trim under the dash pod 92855252100.
cannot see the mounting screw listed on PET.
the trim hole for the screw is tapered and both screws are a good fit in the taper
but does anybody know if its the A or B type pictured
cheers
Phil

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[worf]

Pretty sure it’s “B.” IIRC it goes into a speed nut and those are always course-threaded fasteners. “A” is machine thread, so only goes into a hole with actual machined threads.

[h2pmr]

thanks Dave, i could not remember if it went into a speed nut or direct into alloy steering column.
cheers
Phil

[h2pmr]

has anybody got a picture of the alt air hose, and its mounting bracket + temp sensor, all as it should be mounted on the back of the wheel arch shield ?
i have finally got the temp sensor part remade at a far more realistic price than a new Porsche one, and within 50'ish ohms of the factory spec.
and was going to make a kit up and put it on ebay, but would be ideal to see how it was from the factory.
cheers
Phil

[worf]

The way it was done from the factory is so stupid that I would not wish to propagate it.

[jschiller]

Ummm...Dave, you might want to look away now.

air hose.JPG

Alternator Hose Routing 3.jpeg

[h2pmr]

Ummm...Dave, you might want to look away now.
air hose.JPG

Alternator Hose Routing 3.jpeg

yes thats just what i was looking for, many thanks
i know its not the best place to put it but it seems to be all about originality nowadays, even if it cannot be seen.
cheers
Phil

[worf]

Yup. That’s it.

Extremely futzy to actually do it that way.

If you have enough hose in the fender cavity to make it easy, the hose interferes with headlight movement. If you want working headlights then the hose has to have insufficient slack to enable actually screwing it to the splash guard.

[hernanca]

Yup. That’s it.

Extremely futzy to actually do it that way.

If you have enough hose in the fender cavity to make it easy, the hose interferes with headlight movement. If you want working headlights then the hose has to have insufficient slack to enable actually screwing it to the splash guard.

Wow, talk about a Catch 22!

What is the "better way". Anyone have a picture? I have looked for it once or 2x on TOS, or maybe once and promised myself to look for it later.... If it is not handy to anyone, I may look again at TOS and post here when I find it (knowing that if I visit TOS I am risking another beating by assumed moderator Robb M.... ).

[worf]

What is the "better way". Anyone have a picture? I have looked for it once or 2x on TOS, or maybe once and promised myself to look for it later.... If it is not handy to anyone, I may look again at TOS and post here when I find it (knowing that if I visit TOS I am risking another beating by assumed moderator Robb M.... ).

The key problem is all that crap secured to the splash guard.

Someone on TOS fab’d an adapter for the factory bits that fastens to the fender brace. That’s really what the factory should have done. And, @h2pmr *that* is a kit I’d have my clients buy for me to install.

[jschiller]

https://rennlist.com/forums/928-forum/1 ... -hose.html
Starting at post #4
and...
https://rennlist.com/forums/928-forum/3 ... ement.html

[worf]

https://rennlist.com/forums/928-forum/1 ... -hose.html
Starting at post #4
and...
https://rennlist.com/forums/928-forum/3 ... ement.html

CEET or SCEET ducting from Aircraft Spruce

https://www.aircraftspruce.com/categori ... cting.html

The last-referenced TOS post provides a picture of the architecture, but the execution is unimaginative and a bit ghetto.

[h2pmr]

thanks for the information Gents, i see the metal bracket to mount the U shaped pipe is still available from Porsche, so will get some and make up a new mounting kit with new pipe from Alt + my sensor etc.
will do a thread write up on here when its all done
now just need to find some connectors that will allow a direct plug into the factory wiring loom for the temp sensor
i usually try not to copy others work / ideas but plagiarism is the sincerest form of flattery
cheers
Phil

[worf]

Sure Seal brand connectors are used for o2 sensor and other round-style connectors. I have a supply of the 2 and 3 pin bodies.

However, the external temp sensor has a “weird” tapered end that isn’t one of those.

Good luck finding them. Post back if you find them.

You might contact Kroon a see if they know.

[h2pmr]

thanks Dave will contact Kroon + a company i have used in Germany that break old Merc's, many of their connectors are the same as old Porsche's.
have just sold the one pictured below, so need to get some measurements of it before i post it
bloody typical this seems to be the only connector of its type on a 928
will let you know how i get on
cheers
Phil

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[worf]

butt-splicing a junk yard connector is quite different from sourcing the proper pins and connector body to reproduce a “factory finish.”

[LSHK928]

Yup. That’s it.

Extremely futzy to actually do it that way.

If you have enough hose in the fender cavity to make it easy, the hose interferes with headlight movement. If you want working headlights then the hose has to have insufficient slack to enable actually screwing it to the splash guard.

Wow, talk about a Catch 22!

What is the "better way". Anyone have a picture? I have looked for it once or 2x on TOS, or maybe once and promised myself to look for it later.... If it is not handy to anyone, I may look again at TOS and post here when I find it (knowing that if I visit TOS I am risking another beating by assumed moderator Robb M.... ).

I did it this way - easy and cheap. I am missing the belly pans, of course, so I needed something tough. Should outlast the car.

[h2pmr]

butt-splicing a junk yard connector is quite different from sourcing the proper pins and connector body to reproduce a “factory finish.”

Kroon think they do the connector, they just needed pictures with digital micrometer of its shapes and sizes.
just sent the pictures so should know in a couple of days, fingers crossed

[hernanca]

I did it this way - easy and cheap. I am missing the belly pans, of course, so I needed something tough. Should outlast the car.

Nice beefy alternate hose & mounting, LandShark.

Lots of different solutions - I want to update this on my car!

[h2pmr]

sadly Kroon do not do the connector for the outside temp sensor, their reply below:
Hi Phil,
Thank you for the pictures.
That’s a different one than the one we have here.
Ours is a ITT Cannon Sure Seal Circular Connector but this one has a different shape.
Unfortunately, we don’t have it available.

[worf]

sadly Kroon do not do the connector for the outside temp sensor, their reply below:
…
Ours is a ITT Cannon Sure Seal Circular Connector but this one has a different shape.
Unfortunately, we don’t have it available.

Yeah. Like I wrote, the other connectors are Sure Seal connectors.

The next step is to see if there are any identifying numbers on either connector body.

[h2pmr]

not a question, but just noticed a Genuine Porsche press pack for the 87S4 listed on ebay UK, item number 356202636130
its in German, but there cannot be many out there for sale.
listing ends in 5 days.
no connection at all with seller, but his feedback score is impressive.
cheers
Phil

[h2pmr]

front TPMS receiver that is mounted to the front hub, removed from a 90 model.
anybody know if 4.8K ohms is a good reading for one ?
cheers
Phil

[worf]

front TPMS receiver that is mounted to the front hub, removed from a 90 model.
anybody know if 4.8K ohms is a good reading for one ?

Nope. Sorry.

[h2pmr]

thanks Dave, now need to reduce the price a tad

[h2pmr]

is there an alternative part that can be used if the heater flap arm 92857439702 breaks ?
i see its NLA, but wondering if any other arm from an S4 heater box is the same.
cheers
Phil

[worf]

is there an alternative part that can be used if the heater flap arm 92857439702 breaks ?

I lo0ked at the parts diagram. I have no idea what that part is.

However, I have a just-restored HVAC box on my bench. Take a picture or three of this thing and i’ll take a look.

[h2pmr]

thanks Dave

09.jpg

999.jpg

[worf]

It looks like there are different HVAC boxes for RHD.

The LHD boxes do not have the ‘circled mechanism’ on the engine side of the box.

Or, your box is from an 77? It’s super weird.

Anyway, you circled three parts… but you’re looking for the plastic arm the connects the diaphragm’s arm to the axle inside the box?

[h2pmr]

tanks Dave, its not actually my heater box, i sold an unrelated part to a guy on ebay and he asked if i had the part he circled.
i have only ever worked on the 87+ models and i have never seen it before.
its just the plastic arm on the outside of the air box he is in need of
92857439702 is shown on the 83-86 model years on PET ON 813-30 air conditioner
cheers
Phil

[worf]

its just the plastic arm on the outside of the air box he is in need of
92857439702 is shown on the 83-86 model years on PET ON 813-30 air conditioner

Ok… so I looked at PET and found the part and I looked at my pictures.

Short story: if the part is NLA then the best bet is to scavenge it from a junk yard HVAC box. That ‘type’ of part - plastic arm where through one end a ‘square axle’ is inserted and the other on which a vacuum actuator rod is retained - occurs in several locations on the box. Perhaps, one of a similar type can be substituted.

Long story: I have looked at my pictures and found HVAC box pictures for a ‘79,’80,’84,’ and ‘86 and the a box you pictures is still a mystery to me. I have never seen a box with one of the vacuum actuators riveted to the firewall plenum-side. Yes, I “see” it in PET, but never have I done with my own eyes.

[h2pmr]

many thanks for looking Dave, i does look like a bit of an after thought by Porsche.
without me seeing it in my hand and getting the exact dimensions of it i don't fancy hoping an S4 one might fit, so will just tell the guy to keep checking ebay, breakers etc.
cheers
Phil

[h2pmr]

its just the plastic arm on the outside of the air box he is in need of
92857439702 is shown on the 83-86 model years on PET ON 813-30 air conditioner

Ok… so I looked at PET and found the part and I looked at my pictures.

Short story: if the part is NLA then the best bet is to scavenge it from a junk yard HVAC box. That ‘type’ of part - plastic arm where through one end a ‘square axle’ is inserted and the other on which a vacuum actuator rod is retained - occurs in several locations on the box. Perhaps, one of a similar type can be substituted.

Long story: I have looked at my pictures and found HVAC box pictures for a ‘79,’80,’84,’ and ‘86 and the a box you pictures is still a mystery to me. I have never seen a box with one of the vacuum actuators riveted to the firewall plenum-side. Yes, I “see” it in PET, but never have I done with my own eyes.

guy just contacted me saying its actually a LHD 79 model 928 and is keeping a lookout for one on ebay etc.
cheers
Phil