TurboCup87

The Cup Spoiler Lip/splitter is a direct replacement for the stock and is part number 996 505 986 91. I got mine from The Racer's Group. I carry a good supply of the plastic rivets that help hold the thing in place too. Street rivets are listed at 999 507 427 40 or 999 507 497 40, Cup as 999 507 557 40, all will work. In any case you should consider the spoiler lip as a "consumable item". You will scrape it, and, likely, rip it off at some point no matter how careful you are. Mine has even been bent backwards, and ripped off by insufficiently flattend road kill. I bent the lip under the car, then ran over it and it flew into a farmer's field. I retrieved it and, other than some scratches, it still works fine. My experience: if you just stick it on with the plastic rivets it can even blow off at high speed. I've finally had good luck by thoroughly cleaning both the lip and the bumper with adhesive cleaner, then using Porsche's double sided sticky foam tape (part number 000 043 206 04, which is made by 3M) AND the plastic rivets, AND then sealing the joint between the lip and bumper with 1.5" wide stretchy vinyl tape. The tape helps by keeping road grit and gravel from jamming into the joint and prying it open at speed. For the double sided tape, you can substitute the strongest 3M stuff you can find at the hardware store, but, it will likely be white. The Porsche part is dark gray. This process will keep the lip on through most abuse, and still let it tear off the bumper in a major impact (mine was a racoon) without tearing the holes in the bumper. All this is easiest done with the bumper taken off the car. You might take the bumper off every year anyway to clean all the junk out of the radiators. Good luck.

THX for all of the info, clord

Hi Gator..... The Cup front air dam for the 996 GT3 is a small amount deeper/wider in the front/center, but is maintains it's width all the way around to it's ends near the front wheel arches. The stock dam/splitter tapers from the front corners to the ends at the wheel arches. The difference may not appear great, but, the aerodynamic difference must be measurable. The Cup dam is cheaper too.

Can you suggest a source, or have Part# for this Cup splitter?

Could anyone provide me with both a Halogen as well as Litronic wiring diagram for a 2004 GT3? I'm trying to retrofit HIDs to my car. TIA for any help.

Not exactly what I am saying but along the right lines. I am no expert. It really is a science that I was fortunate enough to witness in a wind tunnel. On a high speed track a wing positioned with additional height at the appropriate angle will provide greater rear traction. As the rear pushes down the front could have the opposite effect creating a stability problem. There is a definite purpose for shims and such but please consider the Cup Lip when you shim the wing. Road courses with occasional high speed straights require greater downforce on the front. A simple change in the lip will make a noticeable difference with turn in requiring less trail braking to keep the front end planted.

The attached photo is top of the corkscrew at Laguna Seca. The car can be at or near 90MPH cresting the hill, breathing the throttle at the crest, then braking, turn in. That little lip you see here on the car made a difference. Look at the grip on the rear tires while the front is ever so nicely pointed. There is a thread here somewhere discussing steering precision. Makes you wonder if it is all about aerodynamics?

Where did you get the Cup front lip? I've had the same concern and haven't rushed to get the shims, since I was concerned about front lift.

I did install the factory engine plate on my "flat bottom" '99C4 and know that the same plate will not fit on my GT3 motor. The factory option is specific to the flat bottom engine.

Thanks for the info... guess it won't work.

Such a factory option engine protection plate is available for the 'flat bottom', regular 996 engine. I am not aware of any such plate for the GT3/Turbo/GT2 motor. If it is, what is the part number?

I don't know if there is a different one for the GT3 engine or if the same plate works for both engines. I'm trying to learn more about these plates. Any info will be appreciated.

Has any one used these? Apparently there is an aluminum one from Porsche, and one or two aftermarket ones. Mine will be a dual purpose car for a couple of years, DD and about 6 DE weekends per year. Other than some more weight at the wrong end, any downside to using these?

Welcome! There is a track prepped '87 944 Turbo in my past as well.

They're great cars. I have the good fortune of having this one prepped at Weissach. It is the first of the 1987 Escort Turbo Cup cars. It's going to another home in a few weeks. I'll miss it greatly.

Got my 2004 a week ago, with only 3500 mi on it. I've been soaking up the Knowledge for the last several days. Here are some pics along with it's predecessors

http://i117.photobucket.com/albums/o73/TopazM3/IMG_0883.jpg

http://i117.photobucket.com/albums/o73/TopazM3/IMG_0877.jpg

http://i117.photobucket.com/albums/o73/TopazM3/IMG_0188.jpg