spenny_b

Hi Guys,

This weeks daftest "should be easy, but isn't" query (sorry!)...

I recently bought a set of refurbed original Cup wheels for my 3.3, of course they came without centre caps, so a quick phonecall to my OPC where they did the p/n research and got them in....easy, job done, I thought.











The p/n ordered was 965 361 303 00 - which is the flat cap (as opposed to the later concave 993T caps) with "Turbo" inscription and the circle.

The fronts fit fine.

The rears just don't sit in correctly. Pushing pretty hard to get them flush, they barely move and spring back out again. The fingers at the rear don't seem to reach the chamfered lip that "pulls" the cap inwards. I can force one edge in to sit flush, but as soon as you give the opposing edge a thump with your palm, it pops out the other side.






The spigot depth is about 5.95mm
The cap thickness is about 6.03mm
The overall dimension from cap face > end of the plastic finger = 18.66mm





My first thought was that the powder coating was perhaps too thick but having a look at the spigot and it looks ok and certainly very similar to the fronts....it'd have to be a crazy thickness to account for the amount of protrusion in the pics.

Tried doing some sleuthing across 2x copies of the PET....but all p/n's are prefixed with either 993 xxxx or 928 xxxx

So....what I'd like some help with pls...

• Is anyone able to have a look at their centre caps and let me know the p/n?
  
• Was the "Turbo" inscribed cap the stock cap for a 1992 Turbo 3.3 wearing 17" Cups? (Or are my caps perhaps only meant for the 18" Speedlines?)
  
• (and I know this is an ask...) For any centre cap on a Cup wheel, can anyone give me the thickness of the face itself?

I'd seriously be so grateful if somebody could take the time...the OPC are a great bunch, but are drawing blanks at the moment.....needs some real-world identification rather than p/n jockying.

wagonface

Not sure if this helps, but I ordered 4 x 965 361 303 00 and they fit my genuine 18" speedlines and my 18" Veloce speedline replicas.

spenny_b

Thanks Wagonface...yep, it's all useful. Cheers

bweSteve

Not sure if this will help you at all,... but my original build sheet says that my 17" Cups came with "crest" center caps.

But maybe, when that option XD4 is ordered, it replaces the "Turbo" script caps?

or maybe I am making things confusing by mixing up MY's in the discussion. Apologies if this is so.

I have 18"s on mine, and do not own 17's, so I can't help you there.

spenny_b

Bit of an update - just measured the OD of the cap...76.85mm. The ID of the spigot on the wheel is only 75.9mm. Hmm, that'll be it then.

Next job, make some kind of mandrel to mount the caps onto (I'm thinking about using the 2 x discreet cap removal holes, they're a snug fit for an M3 caphead), then mount them in the lathe and reduce the OD.....an hours job to set it up, for about 15secs of turning time!

Back soon with an update....

spenny_b

Thanks Steve

spenny_b

Well, problem now resolved - probably a case of me over-thinking it, but hoping that I could simply exchange one set of caps for another, for a perfect fit.

As mentioned above, the problem looks to have been the ID of the spigot hole, so I decided to adjust the caps rather than compromise the finish of the rims.



Some time spent mounting the caps onto a bar of plastic stock I have, drilling and tapping a pair of M3 holes, then mounting into a 4-jaw chuck to get them spot-on concentric...took forever to dial it in - I didn't want to shorten that bar, but it would've helped to get it setup. Then *ever-so-carefully* removing 0.2mm per cut to get them 1mm smaller in OD.



Some light deburring, and hey-presto, they snap into place, with that tapered spigot hole pulling the retainer fingers in and snapping everything into place.

Sorted!

Thanks for the help guys (hopefully if somebody else has the same issue in the future, this thread will help..)

bweSteve

Wow, you were right Spenny, a lot of setup time, for seconds of turning. Nice that you have a Lathe tho!! Well done.

Also good choice on modifying the caps, verses compromising the finish of the rims. Porsche guys know their stuff.

Nice pics too. This will definitely help others,... and thus the root of why this forum is so awesome.
Thnx!!
=Steve

spenny_b

Thanks Steve!...if you like that, take a look at the 32-page epic via the link below, plenty more where this came from!...like, 4yrs of it that hopefully others will also find useful...maybe....

cobalt

The original caps were metal painted and said turbo optional caps XD4 were metal and had a crested cap with the lettering Porsche in all gold.

30 CSL

An interesting question for long winter evenings : Does anyone know for sure when Porsche logo with black lettering came for the first time ?!

As far as I know, Porsche logo with black lettering ( hood and wheel caps ) appeared with Porsche 993s ( e.g. MY 1994 ).

As Anthony says, I would be very tempted to believe that all 964 Turbo cars came ( as did all the cars of the "G" series ) with a lettering
Porsche in all gold... but are we 100% sure it also was the case for MY 1994 Turbo 3.6 cars ?! Does anyone know for sure ?!



Thx

pirahna

My 94 turbo has the gold lettering on metal caps, my 95 993 had the black lettering on metal caps.

30 CSL

That's already a very good start ...

cobalt

There is no way to know for sure. The line is not a straight cut through for many changes.

Some of the last 964 turbo 3.6's had some 993 parts installed. Late vin 964T's had the black painted vs gold door strikers. I have also seen some very early 94 turbos with the earlier style single support glove box with the latch by the **** most of them have the later 993 style double support with center latch. Then there is the question of when the ribbed vs non ribbed door seals began. The 993 used the non ribbed version but have seen some late 94's with the non ribbed version.

I have seen one or two turbo S's with black lettering center caps and gold lettering badge. I am not sure if this was due to replacement or if these came from the factory this way. Based on mileage and condition of the vehicle I would have to assume they were supplied that way from the factory.

General rule I would say is the gold lettered badge is considered stock for the 964 but these are very hard to come by lately.

bweSteve

This is great information for a guy like me ( who unfortunately did not pay attention to these details back in his first days of 964 ownership).

Since my caps are plastic replicas, all silver, and I have never really liked the look.....

WHERE can I find a set of metal caps? I'd love to put them on. And I would not even mind the black letters (since I'm so late to the game).

When I do a quick look on eBay, there are TONS of caps being sold, and I really have no clue how to differentiate the various choices!! ugh. Need help!!

=Steve