If this topic has been 'done to death' tell me, however, search not functioning at present.

Do the rear spoilers of any type on our cars give any gain other than aesthetics?

I read a while ago that the addition of the rear spoiler to the Audi TT (you may remember its original stability problems) gave an additional 70lb of downforce at 200kph.

 

which rear spoiler are you talking about? It depend on what kind of rear spoiler.

The OEM rear spoiler still can achive a zero lift. The nismo rear spoiler i think also still can achive a zerolift (unsure) but they were aerodynamically tested in wind tunnel.

The GT-wing i guess will provide you a lot of downforce but of course you'll lose the Zero-lift.

I heard Audi TT does have a problem with rear spoiler. It's because the position the spoiler sit. the Audi TT is design very round (like a ball) on the front and back. So i suppose the air can just directed to the back of the car, but not sweeped off the car.

The 350Z if you looked at the touring back end (without OEM spoiler) You'll see a slight higher angle and i think it help to direct the air passed.

But this only my way of thinking. But if i'm wrong i'll be happy that someone would correct me. Because i would willing to learn from Trial and Error too

 

The Track aero kit is functional FWIW. IMO we don't have enough power or drive at high enough speeds for it to be a concern.

You want an interesting ride drive my 28 year old Landy at 110kph. That's about top speed on the flat, can go a bit more downhill but it's a real thrill ride.

 

well i rode mine to 200kph already it feels stable at high speed though. Luckyly i didn't got caught when i'm doing that
on that time why only mod was the VS1 lip

 

I've only been to ~170 before the straight ran out but I agree it felt very stable at those speeds.

 

did 190-200kph a few times, the car felt quite stable, but still not as good as my previous BMW (325ci), tho the zed get there quicker

 

Concencus then rear spoilers unless radical, aesthetic only?

 

If you have downforce, that is "better" than zero lift. Zero lift just means the car is not being lifted up, it is completely neutral at speed. If you have downforce, it is the aerodynamic equivalent of adding sand bags to the rear of your car.

 

Concencus then rear spoilers unless radical, aesthetic only?

No, the Track model spoilers, front and rear, reduce the drag coefficient from 0.29 to 0.28. So functional.

 

At 210kph or so the car feels very stable ... no problems from me.

 

No, my data systems spoiler is very functional. On drag slicks, at 18psi, the car was very floaty over 80 mph with the stock spoiler. With the data systems illusions spoiler, it is firmly planted with pressures as low as 13psi.

 

Coefficent of drag is not the same as downforce. (though they are related indirectly because lift requires drag )

Spoilers work to smooth or direct airflow around the car. By directing the air away from or to the proper places you can reduce drag and/or lift... both things you want to do. So generally they do not create downforce, but instead reduce lift. Turbulent air, or flows in the incorrect places can cause more drag, or low pressure in the wrong areas, which is why you use spoilers or diffusers to prevent that.

A pure wing on the other hand is about creating downforce and typically isn't related to reducing the coefficent of drag for the car. Creating lift requires increasing drag (downforce is just lift pointed down).

You want less drag for efficency and speed. You want downforce for traction and stability. Its a balence.

 

Yes I agree, I was saying that because the stock spoilers reduce the drag coefficient they have 'function' i.e it enables the car to move through the air more easily than a car without them could.

 

I have the VEILSIDE rear wing and at about 150 youcan see the down force as the wing starts to bend, at 245 the you can feel the road getting harder. I have not put it through a wind tunnel but I believe it works realy well at high speed. I feel very comfortable at high speeds.

Jacko

 

FAARK! - wot about the wildlife at that speed - where yer gunna fit a 'roo if yer collect one?

FARSTY

 

I've been driving out here for 14 Years and havn't hit one yet. Goy an Eagle though, hit hi at 155 - he flew out of a gully, bounced off and cracket the light $900 nice hey. Most of the roads are clear during the day and you can see for Miles/Klm's.

Just got the car back on the road and whent to Adelaide for the weeken, nice run - still waiting on rest of body kit to come in from JAPAN..


Jacko

 

Has anyone here seen a photo of what happens when you run into a horse which is facing you one the road? (Dont have any roo shots.)

If not does anyone want to see it?

 

Seen it....

 

Yeah, not too good is it. Imagine at 245!! It would go all the way through.

 

That is versus the 'Touring'?