Oh, and a P.S. - I am convinced the front spoiler helped limit the damage to the Hawaiian when I hit a rabbit that made a left instead of a right, in the roadway and I nailed it at 130 mph - there were a lot less crevasses to pull fir (and other material) out of because of the spoiler. (Sorry, Thumper, but he was rabbit-walking against the light).

 

S4 wing is certainly an excellent tailgate accessory. G

 

A wingless GTS...who really needs a wing anyways? The cars are just good for show!

 

Think I may have more somewhere. But I think this beauty belonged to an English gentleman.






Nicole, and anyone else.
Did Projekt 928's aerodynamic graph show the older S or the S4 body?
I'm asking cause I thought the S4 type wing was to delaminate the airflow from grabbing the butt to reduce drag. Maybe a little for downforce reduction. But mainly to git her moving faster in the air.

George, if you turn that S4 wing into a mobile bar replete with blender I wanna see pics.
Blender on one side. Ice cube bucket on the other. Nice!

 

Not being defensive Keith, but I do not think anyone who owns a 928 has it just for show. As for being wingless, I just like a smoother *** on what I'm riding. I've owned 2 Austin Healey 3000's, 2 XKE jags, a couple of 260Z's and a 944 as well as some unnotable thunderbirds, lincolns and jag sedans. I owned them all well before anyone could accuse me of a mid-life crisis and drove them all hard without ever having a wing, so why have one on my $4? In my advanced years (60) I just want a fast, smooth and sleek automoble that's comfortable at reasonably high speeds. However, I'm not inclined to drive 150 on any city street or highway and with two restaurants and 60-some employees to manage, do not have the time and ability to do the fun things you do with yours on the track. You lucky Dog!

Paul Barrera

 

ew928: Yeah! Thats what I'm talking about! Side window delete is a little bit over the top er.....side, but that smooth rear end shot is beautiful in my eyes. Thanks for the Pics!

Paul Barrera

 

I remember seeing a wingless GTS at Devek Days a couple of years ago, and I thought to myself, it looked very modern. The car has a very nice line without the wing

 

Paul...just messin' with ya..don't take me seriously on them just being show cars.

Ernest!..I think you just convinced me to "crowbar" the wing off my GTS!!! That looks fantastic! Too bad the GTS's have the center reflector cause the S4 rears look so much better without them.

Hmmm (...note to self...hack off the rear wing)

 

My 1980 with no front spoiler or wing felt very "light" in the front at 140mph during the ORR. I put a home-made front spoiler on it the next year, and it felt much better. My S4 feels just fine at 155mph with stock spoiler and wing. George's S4 feels fine (as a passenger) at 189mph with lowered ride height, custom front spoiler and slightly raised stock wing. Anything less than 130mph or so probably wouldn't cause you to notice the missing wing.

Rich

 

The aerodynamic graph was of the older model. But what does it really tell you? It only refers to the pressure in the very center of the car. That's just one very small area of the overall surface of the car.

Based on that diagram, you have no idea what happens 5 or 10 inches further out. Only the aerodynamics team in Weissach knows, because they are the only ones who have the measurements. So, making aerodynamic changes based on that diagram alone is potentially risky.

Aerodynamics are a very complex issue - which is why the Formula 1 teams run one, sometimes two wind tunnels 24 x 7. Porsche has put a lot of time into aerodynamic work on their cars since they got their own, and they achieved pretty dramatic improvements on the 928 from OB to S4. I have no doubt that the rear wing did more than 1% improvement alone.

I stated this before, but in Germany you cannot pass vehicle inspection with a 928 that has a front and no rear spoiler. AFAIK that's because Porsche declared it as unsafe.

I have never heard of a rear spoiler delete option from the factory for the S4 or later models. There was an option to delete BOTH front AND rear on the earlier models only.

 

W A N T E D!
Intrepid 928 S4 or later owner to mount rear wing on force gauge to determine what downforce the puppy generates.
Will be needing speed tests at 100, 120, 140 and top speed.

But ossifer. See all them wires running from the wing. I was doing scientific research to see of that rear wing was rice or for real.

PS. Not sure if this is revelant but I forgot to latch my hatch once and drove the S4 200 miles on the highway and the hatch never lifted up from aero lift.
I only achieved 80ish on the high side so didn't test the triple digit aerodynamics.

But sure wouldn't want anyone to do an early Audi TT on their 928. Rumor was the TT would get light on them rear tires at high speed corners. Aerodynamics don't work too good when the car is sideways.

Is the S4 front spoiler a spoiler in the classic sense or an aero smoothing device to encourage airflow speed under the car.

 

The 928 has very little LIFT and the S -4 rear spoiler has very little down force . The lift "issue" is a carry over from the 911 which was a horrible design The 1972 911 Carrera RS weighed in at just 1985 lbs in race trim at 152 Mph no rear spoiler it had about 320 lb of LIFT at the rear !! The duck tail rear spoiler reduced lift to about 93 lbs and the same time reduced drag slightly from a .41 to a .40 a small change .....in comparison the stock early 928 no spoilers at a bit over 140 mph had less than 60 pounds of lift on either end ! Porsche used that wind tunnel to avoid the mistakes of the 911. Also worth noting that the drag coefficient of the for the 911 1969-1972 was an embarrassing .41 frontal area grew to about 18.5 feet .The early 911 had 183 lbs of front lift reduced to 102 lbs at 140 MPH . So a early 911 with no front spoiler no duck tail at a race weight of just under 2000 lbs would at 150 MPH have 320 lbs lift at the reart and 183 lbs + at the front.....fully 25 % of the weight !!!! And that my friends is the error of the 911 which Porsche wisely fixed for the 928. Total lift might be 4 % you still have nearly 3200 lbs plus drivers weight holding your 928 on the planet nicely balanced 50/50 . The fact is 928s do not get light ! It is an urban MYTH . numbers, text lifted from Porsche Excellence Was Expected "

 

Just for grins ....the family van "2007 Chrysler Pacifica 4dr AWD 2007 Chrysler Pacifica 4dr AWD shown See Larger Photo ... Drag Coefficient .35 drag coefficient ..." That shows how bad the 911 really was in all fairness it was drawn by eye to look nice and never saw a wind tunnel until after it was built another testiment to the FACT that aerodynamics are NOT intuative . Like which has a higher drag coefficient ? a cone with the sharp end pointed into the wind like a jet fighter or the big flat end forward .....

 

...and then there is the issue of cross wind stability. What if the wind comes at an angle?

When the 928 was designed in the 70ies, Porsche did not have a wind tunnel, yet. They had to use the VW wind tunnel. Vehicle aerodynamics were still in its infancy.

The real fine tuning began in the 80ies, with the S4 models. AFAIK the Weissach wind tunnel was still not ready for the development, but was opened around the time the S4 was introduced. Until I find any contradicting information, I have to assume that S4 aerodynamics were done at VW or elsewhere.

 

Paul, Looking forward to seeing your wingless shark in hell. Mac