Phone Dial Design Project - Modern 18" 3-piece forged (Kickstarter launched, see post
#46
Nordschleife Master
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ohhh..... make some 4x100..... I'm going to put my phone dials on my Scirocco...and those 4x100 to 5x130 hub adapters are like $180 a pair (need 30 or 35mm thick ones).. crazy to drop nearly $400..on just the adapters..and then there's the cost of the wheels too..
Lots of older VW's have the 4X100 bolt pattern..and they seem to love Porsche wheels...mostly the phone dials... but they even like the manhole covers too... (If you are looking at selling those manhole's..pop over to vwvortex.
)...
Lots of older VW's have the 4X100 bolt pattern..and they seem to love Porsche wheels...mostly the phone dials... but they even like the manhole covers too... (If you are looking at selling those manhole's..pop over to vwvortex.
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I will save our fellow RL'ers the agony
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#48
Administrator - "Tyson"
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Looking at those VW photos I'm may have to put the custom widened 16" phone-dials that came with my 79 on the wife's 86 Scirocco 16V.
#49
Nordschleife Master
#50
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It might be too early to do so, but it seems to me that at some point the following should also be considered:
1) The 3D shape of the Phone Dial design - that is, it is not just a simple spoke. This gives some added thickness that must be included in the design. Though much of that thickness may go outward, for those lovely protruding ovals, too much of an ET could also cause a protrusion beyond (or a close proximity to) the face of the rim, which I do not like for the 928 application, though it does look pretty cool on a Mini Cooper (pic below).
![Name: porschewheels02 on Mini reduced.jpg
Views: 2344
Size: 46.7 KB](https://rennlist.com/forums/attachments/928-forum/501116d1294075549-phone-dial-design-project-modern-18-3-piece-forged-kickstarter-launched-see-post-porschewheels02-on-mini-reduced.jpg)
2) The outward protrusion of our front brake calipers (especially S4 or GTS fronts). Probably best to design for the ones that protrude the most - I am guessing the GTS fronts. (Edit: though, certainly, spacers could address this after the fact, as well.)
The diagram below references the brake protrusion with label "D":
![Name: tech_spec.jpg
Views: 2859
Size: 56.8 KB](https://rennlist.com/forums/attachments/928-forum/501115d1294075380-phone-dial-design-project-modern-18-3-piece-forged-kickstarter-launched-see-post-tech_spec.jpg)
Maybe this "D" dimension is why Porsche prohibited combining the 928 Phone Dials with the S4 brakes? According to Dave Roberts 928 Specialists site, both the 928 phone dials and the 928 flat disc wheels were 7x16 ET65, and those flat discs were available all the way up to 1989, but only the (928) Phone Dials are prohibited from being combined with the S4 brakes.
While looking for diagrams, I also came accross this site, in case no one else has:
http://www.splitrims.com/pages/information.html
As an aside, I was a bit puzzled about the stepped rim on the early 944 Phone Dials. Why can the 944 Turbo Phone Dials in early offset (8Jx16 23.x mm, up through 1986) have that stepped rim while late offset (8Jx16 53.x mm, 1987+) do not? Here is what I found. Please keep in mind that these are rough measurments (tire was in the way at times, "straight edge" was subjective/eyeballed), but even so, the differences come out, as I quadruple checked them!
944 Phone Dial Differences:
....................................Early 944 Turbo...................Late 944 Turbo
"Oval" holes......................100x80 mm.......................110x87.5 mm
Oval holes circle...................355 mm.............................360mm
(outermost diameter)
Stud holes (diam.)..................44 mm..............................47mm
Spokes (between holes)........"hollow" back...................solid back
Protrusion of design...............31 mm.............................46 mm
outward from
back ("bottom") of rim.
This is interesting and to the topic, as it appears that Porsche stretched the design some themselves! It is also what seems to allow for the stepped rim design in the early 944 Phone Dials vs. the Late 944 Phone Dials.
I don't have any 928 Phone Dials that I can measure against, but would be interested in seeing this information for them as well.
And, FWIW, I believe the stepped rim design counters the "pimpin style"!
(Stepped seems more reminiscent of early Porsche racing wheels or 60's Hot Rod wheels.)
And, finally, Jim, I would be interested in buying such wheels if they look like Phone Dials, and the offsets are configurable (that is, 3-piece rims). The old Hot Rodder in me is interested in having more lip than we typically see on our fronts (even if I have to modify the front fenders to achieve it..). I would of course prefer the stepped rim design, but 18 inch Phone Dials might turn out so cool that it would not matter!
1) The 3D shape of the Phone Dial design - that is, it is not just a simple spoke. This gives some added thickness that must be included in the design. Though much of that thickness may go outward, for those lovely protruding ovals, too much of an ET could also cause a protrusion beyond (or a close proximity to) the face of the rim, which I do not like for the 928 application, though it does look pretty cool on a Mini Cooper (pic below).
![Name: porschewheels02 on Mini reduced.jpg
Views: 2344
Size: 46.7 KB](https://rennlist.com/forums/attachments/928-forum/501116d1294075549-phone-dial-design-project-modern-18-3-piece-forged-kickstarter-launched-see-post-porschewheels02-on-mini-reduced.jpg)
2) The outward protrusion of our front brake calipers (especially S4 or GTS fronts). Probably best to design for the ones that protrude the most - I am guessing the GTS fronts. (Edit: though, certainly, spacers could address this after the fact, as well.)
The diagram below references the brake protrusion with label "D":
![Name: tech_spec.jpg
Views: 2859
Size: 56.8 KB](https://rennlist.com/forums/attachments/928-forum/501115d1294075380-phone-dial-design-project-modern-18-3-piece-forged-kickstarter-launched-see-post-tech_spec.jpg)
Maybe this "D" dimension is why Porsche prohibited combining the 928 Phone Dials with the S4 brakes? According to Dave Roberts 928 Specialists site, both the 928 phone dials and the 928 flat disc wheels were 7x16 ET65, and those flat discs were available all the way up to 1989, but only the (928) Phone Dials are prohibited from being combined with the S4 brakes.
While looking for diagrams, I also came accross this site, in case no one else has:
http://www.splitrims.com/pages/information.html
As an aside, I was a bit puzzled about the stepped rim on the early 944 Phone Dials. Why can the 944 Turbo Phone Dials in early offset (8Jx16 23.x mm, up through 1986) have that stepped rim while late offset (8Jx16 53.x mm, 1987+) do not? Here is what I found. Please keep in mind that these are rough measurments (tire was in the way at times, "straight edge" was subjective/eyeballed), but even so, the differences come out, as I quadruple checked them!
944 Phone Dial Differences:
....................................Early 944 Turbo...................Late 944 Turbo
"Oval" holes......................100x80 mm.......................110x87.5 mm
Oval holes circle...................355 mm.............................360mm
(outermost diameter)
Stud holes (diam.)..................44 mm..............................47mm
Spokes (between holes)........"hollow" back...................solid back
Protrusion of design...............31 mm.............................46 mm
outward from
back ("bottom") of rim.
This is interesting and to the topic, as it appears that Porsche stretched the design some themselves! It is also what seems to allow for the stepped rim design in the early 944 Phone Dials vs. the Late 944 Phone Dials.
I don't have any 928 Phone Dials that I can measure against, but would be interested in seeing this information for them as well.
And, FWIW, I believe the stepped rim design counters the "pimpin style"!
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
And, finally, Jim, I would be interested in buying such wheels if they look like Phone Dials, and the offsets are configurable (that is, 3-piece rims). The old Hot Rodder in me is interested in having more lip than we typically see on our fronts (even if I have to modify the front fenders to achieve it..). I would of course prefer the stepped rim design, but 18 inch Phone Dials might turn out so cool that it would not matter!
Last edited by hernanca; 01-03-2011 at 01:56 PM. Reason: Added comment about spacers addressing D dimension.
#51
Rennlist Member
Thread Starter
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Alright, I did some rough scalling to 18" and the model flowed well.
The following rendering uses 18"x8.5" ET70 front (middle) and 18"x10 ET47 rear (right).
This is to give you all an idea what the front spacing might look like.
The shape of everything requires more refinement.
![](http://www.sparkengineering.com/stuff/Phonie16_18_compare.jpg)
Right now, I'm focussing on a 3-piece design for prototype modularity.
Carlos,
All very good stuff. I'm still applying broad brush strokes, but we will nail down those details once we've acheive a higher level of feasilbility. Thanks!
The following rendering uses 18"x8.5" ET70 front (middle) and 18"x10 ET47 rear (right).
This is to give you all an idea what the front spacing might look like.
The shape of everything requires more refinement.
![](http://www.sparkengineering.com/stuff/Phonie16_18_compare.jpg)
Right now, I'm focussing on a 3-piece design for prototype modularity.
Carlos,
All very good stuff. I'm still applying broad brush strokes, but we will nail down those details once we've acheive a higher level of feasilbility. Thanks!
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
#52
Drifting
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I think those look great and would be awesome in 18 on a 928 today. The first 928 I had a ride in had the originals back in 82. These were as cool to 928's as the the deep concaves were to countachs. A signature wheel and would do a lot to add to 928's in general.
Is that complex shape only possible by forging/casting? It does not look like something that could be machined away from a block.
Can anyone pshop that exact rendering above onto a nice 928 photo in the 18 inch size?
Is that complex shape only possible by forging/casting? It does not look like something that could be machined away from a block.
Can anyone pshop that exact rendering above onto a nice 928 photo in the 18 inch size?
#53
Rennlist Member
Thread Starter
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So using a 3" deep forged "blank" to machine from is feasible.
You will hear more about the manufacturer shortly once we've ironed out feasibility.
I would like to use the car of my "silent patron" as it is this person's expectations which are most important in the near-term.
So, you can expect to see something coming...
#54
Drifting
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What tire sizes are you considering for fitment?
Here's what I worked up using the wheel/tire calculator, comparing GTS tire sizes with proposed rim sizes. For the front...
![](http://img585.imageshack.us/img585/9827/phonedialfronttires.png)
Seems like 8x18ET70 might be better fit for front.
And on the rear....
![](http://img510.imageshack.us/img510/1619/phonedialreartires.png)
Tires are available in these sizes, but could be expensive.
Here's what I worked up using the wheel/tire calculator, comparing GTS tire sizes with proposed rim sizes. For the front...
![](http://img585.imageshack.us/img585/9827/phonedialfronttires.png)
Seems like 8x18ET70 might be better fit for front.
And on the rear....
![](http://img510.imageshack.us/img510/1619/phonedialreartires.png)
Tires are available in these sizes, but could be expensive.
#57
Drifting
#58
Rennlist Member
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Always liked the 'flat' phone dial look better than the 'popped blisters' phone dial...
Like this set for sale on CL:
http://charlotte.craigslist.org/pts/2086635815.html
Like this set for sale on CL:
http://charlotte.craigslist.org/pts/2086635815.html