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Hi all, I registered so I cold take part in this thread..
My question is, does the 996 GT3 have the upper wind deflectors seen here, but without vented wheel arches? How much air are they pushing about inside the wheel arches? I can see that they'd make it all look much tidier, however.
I'm looking to get the 997 wind deflectors (99757523191 and 99757523291) on my 996 C2, but am not sure if 996 GT3 wheel arch liners will do anything. I would rather do this than cut holes in things (the car is going in for work soon, so I was planning on getting them to do it).
I'm also interested. Definitely if it can be made to work without changing everything from the bumper to the wheel well. Maybe if can't.
So there's interest for Carreras who have a turbo front bumper, and for Carreras that don't (yet) have a turbo front bumper.
By the way, it sounds like the discussion is now focused on C4S/Turbo wheel well liners. I don't suppose the 987 or 997 parts would work?
Finally, I understand the Turbo and C4S still have the same opening on the bottom of the car as the Carrera. (Or is it a similar opening with a different shape?) What about the 987 and 997?
Thanks!
This is the list I got for individuals who have done the turbo front bumper conversion (FYI, pre 02 cars will be different form this list):
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.
Hi all, I registered so I cold take part in this thread..
My question is, does the 996 GT3 have the upper wind deflectors seen here, but without vented wheel arches? How much air are they pushing about inside the wheel arches? I can see that they'd make it all look much tidier, however.
I'm looking to get the 997 wind deflectors (99757523191 and 99757523291) on my 996 C2, but am not sure if 996 GT3 wheel arch liners will do anything. I would rather do this than cut holes in things (the car is going in for work soon, so I was planning on getting them to do it).
Yes, the 996 GT3 has the upper wind deflectors seen in the link you posted - it is a picture of these wind deflectors on a 996 GT3. The 996 GT3 wheel arch liners have an opening that funnels air leaving the radiators directly into these wind deflectors. Furthermore, I believe that on the GT3s, the opening where radiator air is blown downwards on a Carrera is closed. This is undoubtedly better for cooling your brakes than either using the C4S/TT/40AE vent setup or doing nothing.
On the otherhand, I'm pretty sure it's worse for drag and lift than the C4S/TT/40AE vent setup, which is very different. Not sure how it compares for drag and lift to the standard Carrera setup.
Yes, the 996 GT3 has the upper wind deflectors seen in the link you posted - it is a picture of these wind deflectors on a 996 GT3. The 996 GT3 wheel arch liners have an opening that funnels air leaving the radiators directly into these wind deflectors. Furthermore, I believe that on the GT3s, the opening where radiator air is blown downwards on a Carrera is closed. This is undoubtedly better for cooling your brakes than either using the C4S/TT/40AE vent setup or doing nothing.
On the otherhand, I'm pretty sure it's worse for drag and lift than the C4S/TT/40AE vent setup, which is very different. Not sure how it compares for drag and lift to the standard Carrera setup.
Great, thanks for the info. I want to improve air flow to my front brakes, so this sounds good.
Has anyone put 996 GT3 wheel arch liners in a C2.1?
Looking at the parts diagrams, my car has a one piece liner:
And the 996 GT3 has a two piece, so I'd need to buy parts 1 & 2?
Looks like it still uses the ducts / air damn under the car (parts 5 & 9).
Interesting. I do not see any difference between the Carrera and GT3 liners where the cutout venting air to the upper brake ducts is. The shape really looks exactly the same. And part number 3 in the top picture makes me wonder if the Carrera liner isn't actually two pieces which are sold as one. Perhaps the picture is the 996.1 GT3 and the cutout is only on the 996.2 GT3 or the RS?
Indeed, I can't work out what the upper deflectors on a 996 GT3 do; It would be really helpful to see some photos of the arch liners on a 996 GT3. Perhaps unsurprisingly Google isn't very helpful.
Apologies to bump an old thread but I never saw anyone take the plunge and actually fit the 996 GT3 liners and 997 upper brake ducts. I did quite a bit of research to verify this before fitment, as to concerns about drag etc, any negative effects must be minimal as the 997 GT2/GT3 also vent along the inner fender and use the radiator exhaust to cool the front brakes.
Below is my how to, everything bolts up with just a little trimming to the new liners.
Part Numbers:
Left and Right 996 GT3 Fender Liner:
99650412392, 99650412492
997 GT3/GT2 Left and Right Brake Ducts:
99757523191, 99757523291
Plastic Rivets, Qty:4 99950749740
2 Zip ties
No other hardware is required but you'll probably break a few of the expanding rivets: 99950749740
1. The old fender liners must be removed first, there are 5 rivets and 4 screws to remove. I believe most people have already done this job at some point.
2. The plastic 90 degree air ducts must be removed next, they are located behind the radiator fans and are held in place by 1 circlip. They direct the output from the radiator fans out through the triangular holes on the bottom of the car. To do this you can either remove the bumper, and then the radiator support bracket or just cut the 90 degree ducts into pieces and remove. The 996 GT3 uses the same radiator and support bracket, confusingly PET shows the 90 degree duct fitted but there is no way this works with it in place. You will want to move the fan resistor from the old location to the new radiator exhaust location..
90 degree duct removed:
3. Next we must trim the new fender liner to match the profile of the old liner. All of your work will be on the lower outside corner of the liner where it meets with the bumper, you are adding a .75"x.1" notch and removing a flange near a mounting screw. Just overlay them and trim to match.
4. Trimming is completed and now fit the liner reverse of removal of the old ones, take note the triangular opening is now gone, a tab now overlaps the bumper at this location.
5. The brake ducts are a bit more work, as the mounting holes are not provided. I utilized the existing holes in the duct as a guide and added the holes needed to the new fender liner. The aluminum bracket can be zip tied to the chassis brake line mount. The duct and liner are joined with 2 plastic rivets.
6. The ducts must be trimmed around the tie rod, I have removed vary little material, will check later for the tie rod rubbing to see if more needs to be removed. The tire/wheel does not rub yet, but may require trimming in the future.
Thats it! It isn't very hot in Texas now (80* today) so I'm unsure whether enlarging the opening in the liner will be required, I did notice the fenders and trunk got pretty warm which the GT3 guys complain about but car seemed very stable >80mph, and I still have the OEM suspension at 106000 miles!
I did the cut-open modification on my 996 C2 and noticed that it did help coolant temperatures on the track (at least on the dash gauge) and I assume it helped brake temperatures but did not measure. I saw no change in front end stability on the track.
I used wire mesh and pop riveted it to the fender liner rather than cutting a bunch of slits in the plastic.
I did some of these mods on my wife's Land Speed 996. I was hunting for Aero benefits more than anything, and did notice some gains when the air could pass straight through the radiators and into the wheel wells. Ultimately I was able to block one main radiator off completely, as well as the center radiator and things were fine in the standing mile for engine temps. I knew at Bonneville on the longer courses we'd not be able to do this, so I was hunting for a resolution before we went there.
Ultimately I ended up removing the fans, and opening up the entire discharge area on that car, and it even worked ok omg the street, but we never sat still in traffic with the car.
Was this on a .1 or .2 car? I saw someone ask about the 2 piece vs 1 piece fender well but didnt notice a definitive response. I have a .1 so I assume I to purchase the 2 pieces of the gt3 fender liner?
Apart from any aero or brake cooling, I really want to block the downward venting fans. I have a higher hp car and the fans are quite active when creeping slow. It tends to blow dirt all over the place, which gets sucked back into the rad fans. Terrible design in that respect.
The gt3 liners fit on the mk1 cars with no mods. I have done this on my gt3ish. I would also reccomend the gt3 air diverter piece that directs it to the brakes. It gets a little pricey but the benifits r worth it.
Hopefully u already have a 3rd rad but if u need more cooling upgrade to cfs rads or go with the turbo rads. The later may require a turbo bumper.
The gt3 liners fit on the mk1 cars with no mods. I have done this on my gt3ish. I would also reccomend the gt3 air diverter piece that directs it to the brakes. It gets a little pricey but the benifits r worth it.
Hopefully u already have a 3rd rad but if u need more cooling upgrade to cfs rads or go with the turbo rads. The later may require a turbo bumper.
De Jeeper and Rob, thanks for revising the thread. Very helpful info.
01-31-2017, 03:09 PM
