Given the target speed of 130 mph......I guess the rear spoiler was there to slow it down and no doubt worked quite well !!

 

and one of the reasons I did not attend as invited in a Cobra repro; didn't see much point in driving 900 miles round trip to make a 120 mile pass slower than the speed at which I intended to commute.

 

Weird setup, indeed. Just off the jackstands and needs to settle?





Like to hear the story about the license plates......

 

Credit to him for doing it, and to all who have done it whether they won or not. They are richer than those who sit in their Lazy-Boys and throw bricks.

 

Hey, I would have to get out of the lazy boy to get a brick to throw.

 

Hell yes, and apologies for any snark. I guarantee that everyone who completed the BBORR had more fun this past weekend than I did, shopping for carpet.

 

For the snark contingent here I will point out a few things.

1. The little strakes above the rear window are called vortex generators. They can be used to break up the aerodynamic suction the occurs on the low pressure side of an airfoil, or they can be used differently to insure the air stays in contact with the airfoil. In this case, it appears that they are intended to keep the airflow in contact with the upper side of the body, so that the boundary layer of air over the rear window is smooth.

2. Next, the white bathroom vent is also there to exchange the pressure differential between the inside and outside of the rear glass. At higher speeds, some cars(63 Avanti, Bricklin SV1) had a habit of punching out the rear glass if driven with the windows open, this vent would delay or eliminate that.

3. The wing is shaped correctly, with the flat/concave side up and the curved/convex side down to put downforce on the rear. As most of you know, as the top speeds of the 928 increased, Porsche grew the wing back there to keep the rear planted during high speed driving.

4. It appears the jackplates on the sides of the wing that attach it to the body are adjustable. Hard to see for sure, but I think it's held on by a fulcrum bolt at the top, and a slot with bolt at the bottom allowing for the setting of the angle of attack.

All in all, some decent engineering behind that setup for saf(er) driving > 125MPH.

 

Someone with the Book project 928 please read and quote the section on the aerodynamics of the original 928 body shape....it says something like at terminal speed it had less than 100 lbs of LIFT....quite unlike the 911 which never made it into a wind tunnel before it was produced the 928 shape was well refined before they ever started making cars.
Sadly the terrible shape and design of the 911 forced Porsche to add spoilers wings and worst of all FENDER FLAIRS which grew to be thought of as Racy, Hot,stylish.....Oh well.
Given that this car is a Euro S it no doubt in stock trim had many happy kilometers putting down the autobahn at speeds well over 130 MPH without flying off into oblivion.
And yes more fun to be out there than sitting in an armchair, if I had an arm chair.

 

Stock Trim? Are you viewing the same images I'm viewing in this thread? Front air dam, headlight bezels sealed, deep sill plates and who knows what in the engine bay.

While the car can be driven down the AB at speeds above 130 and not fly off into the weeks, it would be better if the rear stay planted during any upsets like road defects, or wind currents. I would guess the latest and fastests GTS can be driven at terminal speed without it becoming airborne, but it sure does improve control with the factory wing. This car is a bunch lighter than the factory GTS as well, so that modest lift when applied to this chassis is a larger percentage of the whole car, making the lifting rear an even bigger issue.

 

Texas DMV records show the front license plate belonging to a white '84 Porsche, VIN WP0ZZZ92ZES840xxx, registered to the guy who is #124 on the list that George posted.

The rear license plate is the new style. My guess is that the plates expired last year and he replaced the rear but not the front (because it has a tow hook screwed through it?).

130mph does seem unambitious.

 

We all remember that aerodynamic effects increase at the SQUARE of the speed -- right?

So doubling speed from 65MPH to 130MPH the drag and effectiveness of the aero package is four times greater.

 

Depends on the amount of experience of the driver and the set up of the car.
A well running stock 928S should be able to do little more, and I've seen
some slightly modified 928S' run up to 145 mph class. But there are a lot of
folks that run 110 or 125 mph classes just to enjoy the event, and not over
stress there cars or put in all the other safety equipment need to run the
higher classes. This car was set up for Grand Sports Division, so could run
in a higher class, but I don't know the background of the car or driver, so
I wouldn't comment on why they choice to run 130. Oh and running 130 at
Big Bend is a lot harder then 130 at the Silver State.

George
90 S4 Grand Prix White (Murf #5)
94 GTS 5-Speed Midnight Blue
06 Cayenne S
http://928.jorj7.com

 

130 is enough to have some fun, especially in the turns. And, in the 130 class he was "tech" limited to at least 168 MPH top speed on the course. So, if he wanted to he had a chance to experience the upper limits of the car, or very close to it, if a stock Euro motor powered 928. My trusty 89 S4, when bone stock with the gas pedal to the floor, was trap measured at 165.2 MPH at about 5000 feet elevation.

 

Hello folks, i have been doing this race for 11 years and know this guy.

He has an LS1 in it pushed back about 4 inches. He also has an original 1985(?) saleen mustang that he used to run.

this is us from i believe 2012. this year we took first in the 115 class and missed target by .066 of a second.



if you guys run this event next year, stop and say hello.

name is Andy Kier and Dave Byrd

 

and there you have it ladies and gentleman......kudos.!!!! I always balked at the bborr as there are many more turns than poney express or silver state...I am sure I dont have enough experience and wanting to go faster takes a navigator I would expect....but would be cool, and it is still fun to run the event in the slower classes for the fun of it....

andy