Quinvy

I noticed that quite a few of the JDM cars don't have the large rear spoiler fitted. Some also have the carbon fibre adjustable type, and then there's the WRC type with roof spoiler.

I assume that all these spoilers will have an effect on the handling and the maximum speed of the car? So has anyone done any research into the effects of these spoilers, or is there any information available?

I'm only asking because when I had my Focus RS, the place that used to work on my car fitted a proper carbon fibre WRC rear spoiler to an ST. Problem was, it wouldn't go over 120 mph once it was fitted and the customer had it removed. Is this the case with the large rear spoilers on scoobies?

Sorry if this has been done a million tines before.

cjquicksilver

iTrader: (23)

Apparently the s201 spoiler gives the most downforce that's an oem spoiler?

NuNu9977

This is how mine rolled off the line, In debate wether to put spoiler on, have boot lid n high lvl in the garage sat waiting.......

Dreep

Apparently the genuine high level V5/6 rear spoilers provide something like 60lbs of downforce after 100mph or something. There is some functionality behind it. Supposed to make it feel more stable at higher speeds.

Captain-Sticky

Keep it clean, car looks great like that

Fudgey

iTrader: (1)

Looks like a pugeot 406 lol.

Something about the stigma with an impreza and a big spolier. If i had an sti, it want the big guns on it.

My uk 300 has a mid height spoiler, i dont like the newage low level effort at all, and didnt buy several cars purley because of it.

jura11

iTrader: (7)

Hi there

Mostly of all spoilers on STI or WRX start to have main effect above 120km/h,similar is with any factory supplied diffusers,when they start to create downforce above 100km/h,bellow that they can create drag nothing more.I would stay clear from any non tested products like rear spoilers on the rear windows,they can looks awesome,but they cannot create enough downforce in my view, some like is Varis/Voltex rear wings are tested in wind tunnel not just made up for fun.

Similar can say about the roof fins,they're been made for EVO and not Subaru,on EVO they're been tested on Subaru they're not been officially tested

Without the spoiler you will and can reach top speed sooner,but your handling and high speed stability will be affected

They will affect handling on the track,several month ago on Brands Hatch we are removed on our wagon rear spoiler for better top speed,yes we are reached higher and sooner top speed,but in corners wouldn't say this has help us and mainly during the braking and at higher speed you can feel wagon started to be very unstable

On drag strip is different matter,as most people removing their rear wings,because rear wing can create lots of drag

Those older threads can helps

http://forums.nasioc.com/forums/showthread.php?t=505273

http://forums.nasioc.com/forums/show....php?t=1212432

http://forums.nasioc.com/forums/show...php?p=20281393

Hope this help


Jura

daviee

This is what the engineers at STI said.............The RA-R does without the large rally-spec rear wing but the STI engineers say the lack of rear down force helps to "get the tail around quicker," I have just bought a brand new STI limited lip spoiler and brand new boot lid to suit. Not a fan of big boot lid spoilers less is more

NuNu9977

Thanks, captain.....

MilleniumRacer

iTrader: (25)

I'm not keen on the high ironing board sti units either tbh (each to their own).
I'm getting one of these jdm 2002 1-piece spoiler risers painted 02C & fitted this week .

What's your opinions on this twist to the standard low-level spoiler?

Quinvy

Thanks for the feedback so far, but is it the case that the WRC set up would actually work best? I don't like it aesthetically, but they don't put them on to look good do they?

MattyB1983

iTrader: (51)

Big spoilers on road cars are for aesthetics, nothing else.

Henrik

iTrader: (5)

Define best?

It might create a decent amount of downforce, but this will come at a cost of drag, which means slower straight line performance, top end and increased fuel consumption, and might also affect the balance of the car (unless you add some more aero bits at the front to compensate).

jezza995

I actually quite like that, where have you got yours from ? Can you post some pics when fitted.

jura11

iTrader: (7)

Hi there

Standard OE spoilers works best,in both cases like WRX or STI rear spoilers works

I know many people prefer spoilerless look,which looks good and in many cases looks just awesome,but this spoilerless look is only show

Every spoiler which they designed they actually works,its not for show

Jura

OE STI spoilers looks OK,they're not so big,some aftermarket yes they looks good on the race cars,not sure if I would put on road car,but probably yes I would put Voltex/APR or Varis on the road going car

Jura

In my view OE rear spoiler will not create lots of drag and will not slowdown overall performance.

Fuel consumption without the spoiler not sure,if will increase or decrease,but simple test without the and with spoiler should help to decide plus best way should be testing in MIRA or any wind tunnel

In most cases you will never reach top speed and in top speed without the rear spoiler you can end very badly(search EVO on Marham 30-130 over on Youtube)

Agree on front end,but in most cases you don't need to compensate front end aero balance,just due OE spoilers will never crest high enough downforce which will disturb rear end balance etc

Yes if you will fit above mentioned aftermarket spoilers then yes you should invest money to front splitter like is TA front splitter

This should helps too

http://rusubaru.com/sti-wing-spoiler/

Maybe you remember issue with older Audi TT when car has been unstable in high speed and car just been too dangerous in high speeds

http://www.caranddriver.com/reviews/...t-drive-review

Jura

Tidgy

Scoobyclinic had one of their cars in the wind tunnel at mira (not sure how its spelt lol) a few months back

Quinvy

Many thanks Jura, much appreciated.

Henrik

iTrader: (5)

Oh, I was thinking specifically of the WRC wing, as fitted to the rally cars. I am not sure it translates well on to a road car.

No doubt the standard wing does very little for fuel consumption - Subaru wouldn't have stuck it on there with at least some testing.

Regarding top speed, true, not many people drive at top speed ever, but increased drag also means slower acceleration in general.

According to some book I read on the subject, the little spoilers actually decrease drag, often with little to no change in down force, so removing them will actually increase fuel consumption (It has something to do with the way the spoiler interacts with the underside). Not sure if this is true for the subaru new age wrx affair, but certainly the BMW style spoilers (tiny things on top of boot lid) look like such devices.


Anyway, aerodynamics in general is a hugely interesting topic. I wish I was clever enough to get any of the CFD software running properly, or that someone developed a user interface for the free ones (e.g. OpenCFD) that even a numpty could use.

Markyscoob

My 2p worth. Living on the IOM I can ,ahem, test my car at speed.

On the TT course we have a corner called Brandish which is a constant radius sweeper you can go through at full tilt.....not without the rear spoiler I can't!

My Spec D came with the low spoiler, sorry wing.

I took it off.

I've fitted the high STI wing, and finally the lip spoiler vane on the roof.

Oh, and I fly for a living so understand aerodynamics, because my job depends on it.

So, the Spoiler on a Ltd, etc, really is just that. It alters the flow of air over the tail and spoils the lift created by the asymmetric flow over and under the car. Good examples of true spoilers are the Escort XR3 one, the Sierra XR4x4 and any stuck on "lip" style.

They do not produce downforce par se, just kill lift. A Car is a cambered shape. It will produce lift at the trailing edge until you rotate it and the centre of lift moves rapidly forward. With a negative angle of attack, basically the sills angled down to the front, you've likely to get a minor twisting effect with lift at the rear and slight downforce at the front. By fitting a low lip spoiler at the front, or air dam, you increase the camber like the leading edge flaps on a plane's wing. This forces the front down and the back up.

To balance the car you need rear downforce and the best way to get that without drag is a rear wing. The New age low wing, and upper element of the STi wing do just that.

The problem of the STI wing is the lower element is a spoiler and produces drag. I think perhaps the raised low wing on the pictures above would be a low drag option.

A WRC set produces lots of downforce to enable the car to land jumps flat. That is also produces so much drag the car can't top 130 or so is irrelevant when you have a 7 speed sequential gearbox and 500ft/lb to accelerate and gearing for 110 in top!

The Roof vane helps to turn the airflow more cleanly down from the roof filling the area in front of the wing elements and reducing the tendency for the air to sweep in from the sides and cause side force in crosswinds. It definitely made the car slightly more stable on that fast bend!

Having said all that, aerodynamics play a huge part at speed, but in the UK we are rarely going there... if you want acceleration, you need to lose weight, and that big wing ain't light!

The Fastest setup would be dropped on the floor and no spoilers I would think. God help you if you needed to go round a corner though...

RS_Matt

I only bought an Evo and Subaru because of the spoilers. In the real world it's what makes those two cars tbh.

Gear Head

iTrader: (2)

Where is that from mate?

These look like a good option too:

http://www.ebay.co.uk/itm/2712458364...84.m1423.l2649

MilleniumRacer

iTrader: (25)

Here's a couple of pics for you Jezza .
It's a JDM 1-piece that I imported from Japan.

P.S. I know it's not gonna be everyone's cup of tea, but have brembos, fog covers and spats still to be fitted soon .