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What do you guys think of this Chin Spoiler for track use?

My car has a tail but no chin spoiler (which I hear is bad). I don't have a lot of cash right now, but I found this used. Anyone think that it will be ok or will the damage hurt it's aerodynamics too much to be of value?






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Old 02-02-2004, 03:37 PM
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Would this one work? Needs hardware though. Not sure where to come by that cheap. I think Wayne sells it though
May not fit a 77, I don't know...
FS - 930 Turbo Front Chin Spolier
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Old 02-02-2004, 04:37 PM
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Oh yea, nascar uses duct tape and I bet they go faster than you. If you want that one you could probably tape the back and caulk the front for a quick fix. Might actually hold for a while I did some gasket fixes that way and they have held fine. Is gasket right? Wait. I'm delirious. I mean weather stripping. Targa top seals, door seals and that sort of thing.
I hope Zeke doesn't see this but black latex caulk... the 50 or 75 year GE type. It's good stuff.
NOT SILICONE! NOT SILOCONIZED CAULK
latex caulk
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Old 02-02-2004, 04:41 PM
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unlike adding a tail, adding a chin spoiler should stabilize the car at higher speed by reducing the air under the car. For real down force make it a slant nose.

Keith
Old 02-02-2004, 04:48 PM
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It will be better than no chin spoiler. Mines pretty chewed up from hitting debris on the road, and still works fine.
Old 02-02-2004, 06:07 PM
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Quote:
adding a chin spoiler should stabilize the car at higher speed by reducing the air under the car. For real down force make it a slant nose.
Ah, if only it were that easy. The devil is in the details. Did you ever notice that the 917-30 had a very blunt nose and made far more front downforce then the slanted noses of the 917K's. A 935 style "Slant nose" provides a number of tuning opportunities that a normal early 911 nose does not, but it's not a given that a "slant nose" will always make more downforce then another arrangement.

In general, adding a front air dam will reduce lift. A bigger front air dam = less lift. Getting "downforce" is a whole 'nother project. For your use, I'm sure that it will be better then nothing and no worse then many "broken in" front air dams at the end of last weekend's Daytona 24 hours (assuming that you have the appropriate hardware to mount it securely).
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Old 02-03-2004, 05:23 AM
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I can confirm from personal experience that "silicone caulk" does not stick to the front "rubber" (?) spoiler: it keeps peeling off. So it will undoubtedly be necessary to use "latex caulk" as recommended my Mike Kast... and, in fact, "Duck tape" doesn't at all stick to that rubber spoiler material, either...
But I'm quite sure that, if you can affix that used spoiler to your car at all, the "minor" aerodynamic blemishes would not matter all that much.
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Old 02-03-2004, 05:34 AM
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I'd be willing to bet that the overpriced $200 rubber strip doesn't do so much as beans aerodynamically for the front end of the 911. Perhaps a *slight* change... Oh no!! Don't add a wing and no front strip they say!! Ever look at a Ruf Yellowbird...? Big old Carrera rear spoiler and the CTR front bumper...no rubber strip there...only thing marginally valuable that's been added to those is a narrow width adjustable aluminum piece under the bumper lip that can be tweaked up or down to *slightly* reduce lift...

O.k...coming down off my horse. I just don't see where other than aesthetics and looking nice (and I do like the look) it adds that much benefit. I'd spend the effort on better brakes or a good corner balance. I'm trying to move away from all the flimsy rubber pieces on my own car, put the used one on if you like the look...putting a spanky new one one is a waste of money IMO.

My 2 cents.
-BG
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Old 02-03-2004, 05:38 AM
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BG,

I have to disagree with you in part. I agree they look good. Although, I don't have any wind tunnel data I do know that the front of my car had significantly less lift when I put on the chin spoiler.
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Old 02-03-2004, 05:48 AM
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Just a data point -- my chin spoiler looks a good bit worse than that one, and 120mph feels as smooth as glass.

Dan
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Old 02-03-2004, 06:23 AM
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Quote:
Originally posted by BGCarrera32
Ever look at a Ruf Yellowbird...? Big old Carrera rear spoiler and the CTR front bumper...no rubber strip there...
CTR had a rubber lip under the front bumper. Bill Verburg's car has the Ruf lip on his car, and has posted pictures in the past.

There are a few pictures of it here:
http://www.pelicanparts.com/MotorCity/wmv/3_6liter.htm

Tom
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Old 02-03-2004, 06:43 AM
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Quote:
Originally posted by Mike Kast

I hope Zeke doesn't see this but black latex caulk... the 50 or 75 year GE type. It's good stuff.
NOT SILICONE! NOT SILOCONIZED CAULK
latex caulk
Hey, I'll use caulking if that's what gets the job done. Toughest caulking I have come across (and, I use a case a week in my work) is polyurethane. It's the same as used on body seams. Comes in colors, too.
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Old 02-03-2004, 07:00 AM
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Away from the theory for a minute, I ran the Carrera front rubber spoiler for years without a rear spoiler. Tons of track time, and the car always felt planted. Only exception was the at the top of the uphill esses at Watkins Glen with a 25 knot crosswind one weekend - the rear end was floaty under those conditions.

The rubber you are looking at looks a little raggy. I bought a nice used one for $100, to replace the ripped and raggged original. They get knocked around, and look terrible when that happens.

My take? Keep your eyes open for a nice one at $100 or less, and meantime concetrate on tightening up brakes, suspension, and safety gear - much more bang for the buck.
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Old 02-03-2004, 07:02 AM
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Quote:
Originally posted by APKhaos
...and meantime concetrate on tightening up brakes, suspension, and safety gear - much more bang for the buck.
That was kind of my point, only probably better said. I still fail to see how even the rubber strip shown on the CTR (I stand corrected) does much other than perhaps deflect air, cutting what goes under the car...seems awfully marginal to me...park me in the skeptical camp on most things though...just my opinion. I don't currently have a chin spoiler on my Carrera, so I have no data to back me up...
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Old 02-03-2004, 07:29 AM
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Bill's spoiler



To fix the other one, ruf up with sandpaper, drill a couple of small holes (1/8")- mix some epoxy with some graphite powder (to the consistancy of peanut butter), tape the holes on the underside and feather in the epoxy/graphite mix. sand even.

I'll hold well past 120...
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Old 02-03-2004, 09:02 AM
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Lowering the car will also reduce the amount of air that goes under it. I had the RUF style front bumper with no rubber strip on my G class race car with early Carrera style tail and it never felt like the front end was too loose.
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Old 02-03-2004, 09:19 AM
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Hardware? Caulk? Come on. Mine's held on with zip ties. When I hit something, they snap, I replace them, no problem.

Porsche released aerodynamic data in the past corroborating their claims of reduced lift on the front when using the chin spoiler. I'm too lazy to google it for you.
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Old 02-03-2004, 09:57 AM
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Front aero is funny, and I can't pretend to understand it. By a 'seat of the pants' (and lap times) reading, I couldn't find a difference between this:



And this:




(Click for a larger version of either.)
Old 02-03-2004, 10:54 AM
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Quote:
Originally posted by Jeremy964
Bill's spoiler


To fix the other one, ruf up with sandpaper, drill a couple of small holes (1/8")- mix some epoxy with some graphite powder (to the consistancy of peanut butter), tape the holes on the underside and feather in the epoxy/graphite mix. sand even.

I'll hold well past 120...
The hell with caulk! I like this idea freakin' briliant!
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Old 02-03-2004, 03:23 PM
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Quote:
Originally posted by JackOlsen
Front aero is funny, and I can't pretend to understand it. By a 'seat of the pants' (and lap times) reading, I couldn't find a difference ..........
I assume the dam had more downforce than the splitter? And therefore you were faster overall? Or, was it the splitter and it was faster in a straight line?

Tell us what the seat of your pants told you. There had to be some difference. BTW, I have seen the splitter up close and I really like it. I may have to copy that in a smaller version (less projection).

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Last edited by Zeke; 02-03-2004 at 03:56 PM..
Old 02-03-2004, 03:49 PM
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