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YOUR RESEARCHFront bumper vents
Leading reported evidence
Run masking tape over the portion of bumper
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Performed · outcome unconfirmed · Original poster
Ran a masking tape over the portion of bumper, that ill be working on.
Leading evidence: 'Run masking tape over the portion of bumper' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run masking tape over the portion of bumper' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
I�m planning to use the bracket that came on a tip 996 radiator I picked up used.
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Suggestion · Original poster
I should have used a pencil or a pen and not a sharpie to trace the cut lines, as that line was too wide and difficult to follow with a jigsaw.
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Suggestion
The Rennlist GT and track car crowd says you can use the stock bracket with spacers.
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Ive done these as a fake, purely esthetic for now. Later, as i soak my feet into the track world, i might make it functional though.
Ran a masking tape over the portion of bumper, that ill be working on. I should have used a pencil or a pen and not a sharpie to trace the cut lines, as that line was too wide and difficult to follow with a jigsaw. Ive went with 1" from top edge and made each gap between the next vent 1" as well. the height of the went is 1 7/8", where the bottom of the vent flushes with bottom line of the headlights.
Ive drilled 3/8" holes at each corner, except for the outer bottom ones, which I've drilled with 1" bit to make the radius a tad bigger in that area.
I finished cutting the lines with jig saw. Then I've sanded the lines to make them perfectly straight with 80grid. then Ive sanded with 180 then 320 to make it smooth. Then I've primed the edges from both sides to have good amount of primer on the plastic edges.
then Ive removed the masking tape, wet sanded the edges with 800grit and once i was happy with the smooth cuts, I've taped over the top again, and sprayed the edges again with black gloss paint from inside. The results were good!
It actually looks better than pictures, the light hitting the bevel of the wet sanded edges makes them shinier, but its nice blend throughout.
Now the mesh. this is another one that id do differently and i will probably replace it once i pull the bumper off in future. Ive just went with "grill topper" aluminum mesh from walmart. its too flimsy. there are plenty options you can buy online, but i didn't wanna wait 2 days for it to arrive.
Shaping of the mesh took a lot of time. Ive traced the openings on a 1/4" sheet of MDF and cut and beveled the receiver and the press side. Hopefully you can see from the pic.
Overall, looks ok.
If someone would want it, I can scan the mdf template to scale.
I like it! looks way cleaner than the ebay drop in ones.
so you only painted the edges of the openings? looks great.
By the way there are online dash grill companies that have
hundreds of styles in bulk that you can cut to fit,
did my f350 grill.
I'm no aeronautical engineer, but it seems like air going down into the bumper there will cause more air to exit below, creating LESS down force.
Am I off on this?
Well done, I love the look of this. Keep up these kinds of mods and threads. I think it would be difficult to make it functional (you would need a full aero strategy inside the bumper cover).
Nice work!! Thanks for posting the details.
The way it is done on some of the factory cars that have this is that the center radiator is vented out through the top of the bumper. On the GT3RS (GT2 and Cup cars, IIRC) the center radiator is spaced out at the top, so it is angled forward the top further forward than the bottom. The vent holes in the bottom of the bumper are closed unlike the typical 996 bumper - either never opened originally on the Gt3RS/cup bumpers or blocked off in a conversion. There is also a chimney vent to guide air up and out over the top of the hood (NOT down and through the bottom of the bumper like the tip 996).
The only path for the air traveling through the center radiator is up and out. According to the articles I�ve read, in this configuration, it increases downforce on the front end at high speeds.
Someone, maybe Manthey racing (?) used to sell a kit to do this, but it wasn�t much more than some spacers and longer hardware that is all easy to find locally for less than the kit.
To share what I�ve found:
Two bolts: M8x65 oem part number is 900 378 175 09
Two spacers 48mm long to use behind the radiator's top oem part number 996 507 779 90
And extensions to the coolant lines to the center rad, or flip the radiator.
If you can find a 6gt2 chimney part (996 575 325 30), it�ll save some fab work. I�ve been keeping my eye out for one.
Thanks for the explanation! That makes total sense that in that configuration it will provide more down force. I plan on putting on a complete aero kit someday, when I do I'll look into this mod.
Might be a little easier to conceptualize with this GT40. The air passing through the radiator now has somewhere to go. The same concept applies to our radiators on the sides of the bumper. I think after around 05 or so, Porsche started doing the same with the the fender liners. (Adding vents on the fender liner)
7uIGYe0.jpg
If you are going to cut the vents you should get the GT3RS radiator bracket to re-angle your center radiator to direct airflow out the top of the bumper instead of below. Hose length can be an issue with this modification so you may need to rig some hose extensions.
Not sure when it started but my 05 996 C4S has vents in the fender liner in front of the tires to let the air out. I've read that previously the air was exhausted out the bottom in front of tires, but cannot verify as fact.
Correct. For this to work as intended you need to reposition the radiator and duct it out the top. That's what the factory 996GT3RS/GT2 did.
If you are not tracking then it probably doesn't matter. Looks cool either way.
Yes ducting looks similar to this :
https://photobucket.com/gallery/user...MzAxOQ==/?ref=
Duct is about $200 at Pelican parts. Porsche P/N 996 575 325 30 as pointed out above by cds72911.
The radiator also needs to be tipped up vs down, and the bumper vents under the stock bumper blocked off.
The Rennlist GT and track car crowd says you can use the stock bracket with spacers. Check out some of the posts on the GT2/3 forum. I�m planning to use the bracket that came on a tip 996 radiator I picked up used.
This is correct. Earlier cars don�t have the venting in front of the fender liner. Some of the GT/RS models even have more prominent ducting called air guides that direct air to the brakes (along with the control arm mounted scoops - the Cup version being the largest). I believe the left and right air guides are part number 99657523130 and 99657523230.
Yup, but at least one person on the GT3 part of the forum fabricated ducting out of aluminum to do the same job. Depends upon whether you want original equipment or don�t mind fabrication.
Someone was selling a 996 “GT3” bumper recently on the Houston Craigslist that already had the vents.
They wanted $1k or more and it needed repainting so I didn’t try to buy it.
It didn’t seem worth that to me for some vents.
But I like how yours looks!
Almost tempted to try it myself.
But the thought of cutting into my bumper gives me chills.
That was a fair price if it wasn't cracked at all.
The factory Aero/GT3 bumpers will cost you a lot more than that now, unless Porsche runs another lot of them to manufacture.
YEah, if I remember correctly it had been repaired.
I think it had been cracked.
It needed repainting.
I have a factory Aerokit bumper already, so I didn�t consider it.
If it was dirt cheap I would have nabbed it, but it was more than I wanted to spend.
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