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My gt3 inner fender set up cost a small fortune but it works. If u really want to hold the front down buy diveplanes from demonspeed and mod the center rad to vent over the frunk.
Wow that all looks so clean! Is there a template for the bumper cutouts as you have?
Did you do the full GT3 fender liner replacement or just lower piece with cut out? Some seem to have grille slats also?
Sorry, hope you don't mind the questions. Attempting to do my 99 C2 correctly .........................
Ok, I apologize, looked only at last post. Went further up to see part numbers and such!
Thanks
Np, i used all the gt3 parts. For the center rad i used the factory rsr chimney but made the rest of the parts to alter the direction of the air flow myself. For the cut outs i had my body shop guy go off the rsr mk2 template but they need to be adjusted for the mk1 headlights. The templates r on rennlist somewhere, sorry dont have the link.
More details in my build here. This mod is near the end.
when venting the fender liner, any reason to not leave out the rubber air deflector behind the fan all together? instead of cutting vents into it (like in the Pelican Parts article)? or does it need to stay for some other reason?
Great question. I'm trying to figure that part out as well.
I was under the impression that the 996 GT3 shroud would be different, so that the air being redirected towards the brake rotor would be aimed at the opening in the GT3 fender liner. However according to PET the part numbers for GT3 and 996 C2 are identical. Which makes me wonder just how much air is actually being redirected! I haven't found a picture of the actual GT3 part yet to verify.
996 GT3
99657534104 Air Duct (DRIVER SIDE)
99657534200 Air Duct (PASSENGER SIDE)
996 C2
99657534104 Air Duct (DRIVER SIDE, FROM YEAR 99 UP)
99657534200 Air Duct (PASSENGER SIDE, FROM YEAR 99 UP)
I removed it and I cut the fender liner closest to the tub instead of making the slotts, works great. After cleaning the radiators this spring I also made the duct in front of the radiator seal air tight(or as close as possible) to the radiator, this makes a great difference too.
The air ducts r what clips in the control arms. The fan shroud is deteted in the gt3, fender liner is 2 piece and blocks the air from going under the car. It forces it to the inner wall of the wheel well where an additional scoop clips to the rad tubes and directs the air to rotors.
The air ducts r what clips in the control arms. The fan shroud is deteted in the gt3, fender liner is 2 piece and blocks the air from going under the car. It forces it to the inner wall of the wheel well where an additional scoop clips to the rad tubes and directs the air to rotors.
I love the concept! But I find a part number in PET for the shroud under the GT3. Makes me question.
I'd also love to see pics of the GT3 fender liner. From what I can tell it is a simple matter of hacking a chunk off the 996.2 piece.
I've returned to this project. Which project? Several different venting options are mentioned in this thread. To avoid confusion when I discuss parts and problems, etc. below, I'm aiming for a conversion where the air goes in a C4S or Turbo bumper, through C4S ducts to the radiators, and then after the radiators goes into the wheel well through C4S vents (which direct air outwards, unlike cutting a hole in the wheel well which vents it towards the tire).
I prefer this option because it results in front end lift that is either almost as low as a GT3s (with the C4S spoiler) or even lower (with a Turbo spoiler). But instead of the very low, fragile GT3/aerokit bumper which makes you terrified to perpendicular park, you gut a higher bumper (though you still need to be careful).
Furthermore, Porsche says again and again that if you use the aerokit front end, you must use the back end too (meaning a big wing), or else the aerodynamics will be unbalanced. And adding this wing may be a great thing. But it is expensive. And it does add weight in the worst possible place, unless you can find a (much more expensive) carbon version. On the other hand, the C4S front end is combined with the normal C2 back end on the 40AE. And if that's good enough for Porsche, it's good enough for me.
I am not sure if you can use the 987/997 liner in a 986/996. I would think they could be made to work, but I think you'll need the fasteners from the 9x7 liner. I recall the 9x7 cars had torx screws where the 9x6's had plastic rivets. I'll look more into this.
As mentioned, I've returned to this project (as defined in the previous post), and starting with this list posted by Pelican Parts (copied above), I ended up with a much longer list. But I'm hoping it's not all necessary.
To get an aerodynamic result very similar to that with the C4S and 40AE, there are two clear must-have parts. The C4S bumper (with the C4S spoiler). And the C4S wheel well vents that sends air in the right direction.
Unfortunately, if one goes through the PET, each of these parts are connected to lots of parts used only on the C4S and in some cases the 40AE and Turbo. So many parts that it would be cheaper to buy an aerokit bumper, plus a bunch of spare aerokit bumpers to replace those you bang up while parking. But do you need all these parts?
Well, I've tried to use the wheel well vent piece (part number 996 504 123 00 on the left side) on a Targa, and my local Porsche specialist found it impossible to even fit it without the C4S's radiator mounting bracket. Which suggests that to do this, you need C4S radiators. And fans. And airboxes (the surround behind the radiator and fan). And other brackets, etc. And the C4S a/c condenser. Which seems to require lots of C4S hoses and pipes. Etc., etc.
Unless ... . Assuming there's no way around the C4S mounting bracket, the question is whether you can't attach all the normal C2/C4 engine cooling and a/c hardware to it (and then have the C4S ducts in front of them). I fear not for two reasons. First, does the C4S bracket hold the radiator, etc., in the same position? If part of the reason it leaves space for the wheel well vent is that it moves the radiators forward or positions them at a different angle, that seems like it could cause problems even with the C4S ducts installed. Does anyone know if there is any difference in radiator positions?
Second, the C4S radiators are bigger, and the C4S ducts presumably have larger openings at the radiator end. (True??) If so, then combining these ducts with smaller radiators could have two problems. First, some air could get around the radiators, with adverse effects for cooling and who knows what aero effect. Second, some air could be directed to a part of the radiator that it can't flow through, with the same kind of risks. Does anyone know if the ducts in fact open to a different shape at the radiator end? (And if so, I don't suppose anyone knows if the air nonetheless can't avoid passing through the radiators and won't hit a larger area that it can't flow through than on a C4S.)
Or perhaps someone knows of a good way to modify ducts so that the C2/C4 radiators work? (I believe I mentioned earlier in this thread the recommendation to cut open the top of the C2/C4 ducts at the bumper end. Unfortunately, I don't know exactly how this should work. And I struggle to imagine how this can result in a duct that both captures as much air as a duct actually designed to fit the bumper (the C4S duct) and funnel it smoothly and quickly towards the radiator without messing up the aero. But maybe I'm missing something.)
Like I wrote earlier the front ends can be swapped if you use all the parts that go with that front end.
Can I ask what's your goal here?
There are aftermarket bumpers that look like C4S bumpers that can be installed on regular cars with no changes (according to the aftermarket manufacturers) if you want a C4S looking bumper.
It's easy to cut holes in the fender liners to vent the rads into the wheel wells if that is your goal.
It is possible to put an OEM C4S bumper on a regular car with the stock radiators with some fiddling.
If you are wanting a full C4S front end you are going to need all those parts in your list and more. Hint - use the Turbo PET because it's less confusing.
06-20-2022, 11:11 PM
. Since i track the car its kinda a 5 footer.
