Ducktail Idiocy |
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Ducktail Idiocy |
john914somers |
May 23 2013, 07:26 PM
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#1
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Member Group: Members Posts: 59 Joined: 24-January 12 From: sacramento Member No.: 14,051 Region Association: Northern California |
I'm just wondering if the ducktails do anything to help the aero induced grip??? Any thoughs would be cool!!! Thanks
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carr914 |
May 23 2013, 07:34 PM
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#2
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Racer from Birth Group: Members Posts: 121,083 Joined: 2-February 04 From: Tampa,FL Member No.: 1,623 Region Association: South East States |
Yes,but it depends on your intentions.
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r_towle |
May 23 2013, 08:28 PM
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#3
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Custom Member Group: Members Posts: 24,624 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
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koozy |
May 24 2013, 12:46 AM
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#4
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Senior Member Group: Members Posts: 651 Joined: 21-July 07 Member No.: 7,931 Region Association: None |
Studies have shown the rear spoiler increases the effectiveness of a front splitter and reduces lift at the rear caused by turbulent air
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wndsrfr |
May 25 2013, 08:25 PM
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#5
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Senior Member Group: Members Posts: 1,436 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
I'm just wondering if the ducktails do anything to help the aero induced grip??? Any thoughs would be cool!!! Thanks Thanks for opening this question up again....had the same concern myself as Kermee starts to do a bit of side to side "dancing" at about 120mph on the long straights at VIR where I'm topping out at about 130 or so. The "wiggle" is, I'm guessing, coming from aero turbulence. Here's a couple of pics of the spoiler and the front also, which doesn't have a splitter. Wondering what might be done to settle things down a bit..... Ok...update....I went with the Sheridan front spoiler and it fits nicely...see pic below. On my first track day at VIR I found quite a bit of handling change at high speeds, particularly with more "bite"on steering inputs such as on the climbing esses.....those shaved RA1'S gave a LOT of movement for a smaller steering input than before. I'm attributing that to the increased loading on the front with the spoiler. Wow! Still have a bit of"dancing"or "jigging" at 125 plus on the straights...but not really scary. Attached thumbnail(s) Attached image(s) |
Randal |
May 25 2013, 09:56 PM
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#6
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Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
Can you run a splitter in your class? |
wndsrfr |
May 26 2013, 05:53 AM
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#7
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Senior Member Group: Members Posts: 1,436 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
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carr914 |
May 26 2013, 08:58 AM
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#8
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Racer from Birth Group: Members Posts: 121,083 Joined: 2-February 04 From: Tampa,FL Member No.: 1,623 Region Association: South East States |
Front Valance comes off pretty easy - just put a Deep Valance on it
or do something custom. here is one I did a few years ago, unfortunately a Raccoon decided to commit suicide on it |
pcar916 |
May 26 2013, 02:43 PM
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#9
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Is that a Lola? Group: Members Posts: 1,523 Joined: 2-June 05 From: Little Rock, AR Member No.: 4,188 Region Association: None |
(IMG:style_emoticons/default/agree.gif) A deep air-dam (or even an LE dam) will transform the handling if you have a tail or wing... a good splitter will make it even better. You just have to make sure you're getting some air flow below the engine to help draw air from the engine compartment.
My '84 911 with a whale tail is also a handful at speed without a good (read big) dam or splitter in the front. Good luck! |
nolift914 |
May 28 2013, 07:03 AM
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#10
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Autoxer Group: Members Posts: 184 Joined: 24-May 09 From: Rockaway Beach NY Member No.: 10,399 Region Association: None |
(IMG:style_emoticons/default/agree.gif) A large deep air dam will change the stability of the 914 at speed, the front end will get sucked down and you will lose the light float you are probably experiencing,
I ran a IMSA style air dam with additional rubber trim piece along the bottom (IMG:http://www.914world.com/bbs2/uploads_offsite/i288.photobucket.com-10399-1352725345.1.jpg) or you may want something like this (IMG:http://www.914world.com/bbs2/uploads_offsite/mob288.photobucket.com-10399-1369746206.1.jpg) |
naro914 |
Jun 6 2013, 01:01 PM
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#11
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Losing my mind... Group: Members Posts: 2,476 Joined: 26-May 06 From: Charlotte, NC Member No.: 6,073 Region Association: South East States |
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wndsrfr |
Jun 8 2013, 07:03 PM
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#12
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Senior Member Group: Members Posts: 1,436 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
Update with first experience running the Sheridan front spoiler...see added pic above..
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tomeric914 |
Jun 22 2013, 12:26 PM
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#13
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One Lap of America in a 914! Group: Members Posts: 1,263 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States |
Hey wndsrfr, whose rear trunk/spoiler do you have? I've never seen that one before.
I was at VIR last year for the first time and run 130 in the straight and experienced no dancing. I don't have a rear spoiler yet, but do have a deep front air dam. You had only the rear spoiler and no deep front dam to start, right? |
Randal |
Jun 22 2013, 01:49 PM
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#14
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Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
I didn't notice anything with the rear ducktail until I installed a splitter on my front.
Take a look at that Cascade Lakes Hill Climb shot where I'm going around a right hander. Sure looks like a bunch of air is moving around. Need slow motion to figure out what exactly the air is doing. |
wndsrfr |
Jun 22 2013, 03:55 PM
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#15
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Senior Member Group: Members Posts: 1,436 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
Hey wndsrfr, whose rear trunk/spoiler do you have? I've never seen that one before. I was at VIR last year for the first time and run 130 in the straight and experienced no dancing. I don't have a rear spoiler yet, but do have a deep front air dam. You had only the rear spoiler and no deep front dam to start, right? The rear trunk lid is a fiberglass one that Josh (degreeoff) installed when he did the build about 5 years ago, others may have an idea who the supplier is--supposed to be a "GT" look. Yep, the initial setup was rear spoiler but "stock" rounded valance in front. The car is definitely more planted in the front now but still wiggles at high speeds. I have discovered a worn bushing on the right rear trailing arm, giving about .010" play at the bushing itself....that translates to much more out at the wheel. I've ordered Chris Foley's bushing kit to install before my next outing & hope that calms things down a bit.... |
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