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Fronts don't need any spacers. I promise. 7mm is only needed for a more flush fit. Scrub radius without spacers is the same as the factory 718 S/GTS 2.5 Carrera style wheels.
Originally Posted by OldJedi
Thanks, the 11” rears don’t have a problem?
No problem front or rear.
981 GT4 wheels and no spacers with 245/295 PS4S. Suspension is 981 X73. Ducktail is factory GT4 and the motor removed / coded out.
So…. did you ever wonder what a GT4 TOURING would look like?? I did, I had an idea in my mind but the outcome is much better. I do realize that beauty is in the eye of the beholder, but I am very happy with how it turned out. Flat 6 Motorsports did a fantastic job with their GT4 bumper kit installation. I hope to get some more glamour shots from Flat 6 in the near future. Billy is in the process of putting a GT4 bumper kit on his 981 Boxster. I will post more pictures as I get them. Let me know your thoughts.
Fronts don't need any spacers. I promise. 7mm is only needed for a more flush fit. Scrub radius without spacers is the same as the factory 718 S/GTS 2.5 Carrera style wheels.
No problem front or rear.
981 GT4 wheels and no spacers with 245/295 PS4S. Suspension is 981 X73. Ducktail is factory GT4 and the motor removed / coded out.
Do you have any more info on the factory GT4 ducktail/motor part? I want a ducktail and thought Frog Venom was the only real option. Any more info or part #'s would be helpful!
Unfortunately the OEM GT4 rear spoiler will not work on a 718 Cayman with a rising mechanism ( Base, S, GTS, and GTS 4.0). The spoiler on the GT4 does NOT rise at speed because of the wing. It attaches to the car totally different from how the spoiler with the rising mechanism attaches to the car. Unlike the Spyder and Boxster which attach exactly the same and can be interchangeable.
TWL has an exposed Carbon Fiber rear spoiler that can be attached to the rising mechanism but it is larger than the stock OEM size and shape and fairly expensive. And I was going for a stock look. Frog Venom was the only company that I could find that had the OEM shape GT4 spoiler that easily attached to the rising mechanism. It came as an Exposed Carbon Fiber part and a primered ready to paint part. Since I was going to paint to match the part there was no need to pay extra for the Exposed Carbon Fiber. After it came in it had pin holes and you could see some of the CF weaving texture through the primer. So it needed some filler, sanding and work to make it ready for paint. If I had to do do it over again, I might order the exposed CF spoiler and hope that it was smoother and really ready to be sanded, primered and painted. Frog Venom is the only company that I could find. If someone knows of another company, please let us know.
Unfortunately the OEM GT4 rear spoiler will not work on a 718 Cayman with a rising mechanism ( Base, S, GTS, and GTS 4.0). The spoiler on the GT4 does NOT rise at speed because of the wing. It attaches to the car totally different from how the spoiler with the rising mechanism attaches to the car. Unlike the Spyder and Boxster which attach exactly the same and can be interchangeable.
TWL has an exposed Carbon Fiber rear spoiler that can be attached to the rising mechanism but it is larger than the stock OEM size and shape and fairly expensive. And I was going for a stock look. Frog Venom was the only company that I could find that had the OEM shape GT4 spoiler that easily attached to the rising mechanism. It came as an Exposed Carbon Fiber part and a primered ready to paint part. Since I was going to paint to match the part there was no need to pay extra for the Exposed Carbon Fiber. After it came in it had pin holes and you could see some of the CF weaving texture through the primer. So it needed some filler, sanding and work to make it ready for paint. If I had to do do it over again, I might order the exposed CF spoiler and hope that it was smoother and really ready to be sanded, primered and painted. Frog Venom is the only company that I could find. If someone knows of another company, please let us know.
Despite your issues i actually ordered a spoiler from Duck Venom this morning. Your car looks superb.
Do you have any more info on the factory GT4 ducktail/motor part? I want a ducktail and thought Frog Venom was the only real option. Any more info or part #'s would be helpful!
Originally Posted by OldJedi
Unfortunately the OEM GT4 rear spoiler will not work on a 718 Cayman with a rising mechanism ( Base, S, GTS, and GTS 4.0). The spoiler on the GT4 does NOT rise at speed because of the wing. It attaches to the car totally different from how the spoiler with the rising mechanism attaches to the car. Unlike the Spyder and Boxster which attach exactly the same and can be interchangeable.
It's actually pretty straightforward. The GT4 ducktail fits using the GT4 lower spoiler and four screws. The spoiler elevator motor assembly frame is identical to the GT4 once the motor parts are all removed. You then code the spoiler to deploy at a higher speed so it never tries to actuate the motor and throw a warning on the dash from the lack of communication.
If using PIWIS III, the code changes are done under Development Mode. I'm not sure about the current PIWIS IV or whatever it's now called.
This is literally all it takes. Then it's simply a matter of removing the rear bumper cover to install the GT4 spoiler base (repacing the stock piece) and disassembling the elevator motor and leaving just the frame behind. Cover and zip tie the wiring harness plug going to the now gone motor connection and put it all back together. Have your local body shop paint the upper spoiler to match, install, and enjoy.
This is the 100% OEM parts solution to having a factory ducktail. I've seen others attempt it but have yet to see anyone do it entirely with factory parts. Mine might be the first.
I did this because everyone I asked either said it couldn't be done or had no idea what parts would be required. It took me buying and returning a few incorrect parts to get here, including my local dealership not knowing how to code the spoiler from throwing a warning on my dash at ~77 mp/h. Hopefully the above helps others.
037, thank you so much for the information. There were several of us on here trying to find a way to put an OEM GT4 spoiler on our cars and couldn’t find a solution. Thank you for the part numbers and information. Question though, if the GTS rear spoiler already goes up around 73 MPH, why would it need to be programmed again?
037, thank you so much for the information. There were several of us on here trying to find a way to put an OEM GT4 spoiler on our cars and couldn’t find a solution. Thank you for the part numbers and information. Question though, if the GTS rear spoiler already goes up around 73 MPH, why would it need to be programmed again?
Coding is required because disconnecting the motor assembly alone will cause a warning on the dash at ~77 mp/h saying that the spoiler has a problem and to reduce your speed. When it tries to deploy, the system checks for both the existence of the motor itself and a Hall sensor that tells the elevator where it is in the Z axis. Raising the speed is the only way I've found to work around the lack of elevator.
Raising the deployment speed effectively removes the spoiler elevator from the system since you're unlikely to see 270 km/h (~167 mp/h) even on the track. If you don't code it per above, you'll get the dash warning whenever you hit 77+.
And, you have to remove the motor/elevator parts to fit the GT4 ducktail. The lower spoiler won't fit the bumper cover with the elevator arms still in place.
I also re-coded the console switch to move PSE to the top right and removed both the spoiler and auto-start/stop buttons. AS/S was also removed in my tune, so that whole system is now disabled. I bought a spare console switch assembly and robbed it of the button blanks to fill in the two empty switch locations. It's done "right" with no shortcuts.
Edit: I just realized that if it isn't clear by now, the GT4 spoiler is fixed in place. It doesn't raise. If you do what I did above then you'll end up with a permanent ducktail that doesn't move.
Thank You very much! Best of luck with your project. 037 above found a way to use OEM parts.
it's great to see it can be done but not quite the plug and play solution i'm looking for, plus my car still has porsche warranty so can't be doing any (obvious) mods. the spoiler can be changed back in a couple of minutes if needed. the duck venom looks great, even if the body shop needs to do a bit of work on it.
037, thanks for the very thorough information. For a moment I was worried that changing the top cap on the spoiler would throw a code when the spoiler went up.
When you get a chance, post some pictures of your GT4 spoiler on here, thanks again for all the great information.
11-12-2023, 06:49 PM
