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Old 16th April 2009, 01:33 PM   #1 (permalink)
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Any actual effect of adding Spoiler?

I think that for most cars, it is purely for show and doesn't actually do anything. What do you think?

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Old 16th April 2009, 01:35 PM   #2 (permalink)
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Re: Any actual effect of adding Spoiler?

Doesn't it makes driving more stable? If I am not wrong.

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Old 16th April 2009, 01:36 PM   #3 (permalink)
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Re: Any actual effect of adding Spoiler?

"A spoiler is an aerodynamic accessory designed to improve the airflow over a vehicle for better traction and faster speed."
quoted from http://www.wisegeek.com/what-are-car-spoilers.htm

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Old 16th April 2009, 01:40 PM   #4 (permalink)
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Re: Any actual effect of adding Spoiler?

Yup, it improves the airflow over a car, making it more stable and makes driving easier. Like those on F1 cars.

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Old 16th April 2009, 02:36 PM   #5 (permalink)
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Re: Any actual effect of adding Spoiler?

If i not wrong, it to make it more stable went driving.

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Old 16th April 2009, 03:10 PM   #6 (permalink)
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Re: Any actual effect of adding Spoiler?

geez, i know what it is SUPPOSED to do. But do you think that there is an actual tangible effect going at 50-60km/h??

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Old 16th April 2009, 04:28 PM   #7 (permalink)
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Re: Any actual effect of adding Spoiler?

In motorsports, the purpose of the spoiler is to increase downforce by increasing the effective weight of the car, to maximize traction or grip. The beauty about having spoilers instead of just adding ballast weight, is that as the speed goes up, the downforce (or drag) also goes up exponentially, so we get more downforce when more is required.

Depends on the spoiler also. Most OEM spoilers in 'sports package' are purely for cosmetics. Some like bootlid 'spoilers' (or lip rather) can actually aid the airflow over the car to reduce drag and improve fuel consumption.

But if its about real spoilers, eg GT-wings or those with effective negative angle of attack, then yes they do have an effect. The amount of downforce a spoiler can produce is a product of the surface area, angle of attack (= drag coeff), and the velocity squared (keeping air density constant).

so, at realatively low speeds of 50-60km/h a simple spoiler (of size 1.5m x 0.3m) could have probably a couple kgs or so downforce. not very significant it seems.. properly designed GT-wings would have much higher values. However, since downforce is a product of velocity squared, when speed is doubled, downforce increases by 4 times. this is why F1 cars at full speed can produce enough downforce to drive upside down.

downforce = drag. when we need traction during a corner, or extra stability at very high speeds for example, then downforce is useful. but when we don't need it, for eg cruising on the high way, then it is drag and parasitic (increases fuel consumption). this is why some cars have a retractable spoiler, eg Merc SLR, audi TT and the Veyron, which only deploy when needed.

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Old 16th April 2009, 07:07 PM   #8 (permalink)
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Re: Any actual effect of adding Spoiler?

Originally Posted by maverick View Post
geez, i know what it is SUPPOSED to do. But do you think that there is an actual tangible effect going at 50-60km/h??
If you're going to be drivign at 50-60 km/h, then you're better off saving your money.

There will be a downforce effect, but at those speeds, the downforce doesn't make much difference. If you travel over 100km/h, then the downforce becomes important. Over 200km/h, and I'd say that the downforce is a must.

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Old 17th April 2009, 08:47 AM   #9 (permalink)
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Re: Any actual effect of adding Spoiler?

there's many types of spoiler in the market... each n every one hav diff purposes, but all of them hav a common function=generate downforce... a spoiler is not really necessary in all cars... especially front wheel drive cars, as it lifts the front wheels off the ground, causin less acceleration... if u really wan lots of downforce, traction, the stuffs u could do with a spoiler, u could go with a front spliter(i m not sure bout the spellin) but basically its a large lip which is fitted in front of the car... a properly designed spliter could make ur car turn faster, more agressive, so on n forth...

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Old 23rd April 2009, 02:59 PM   #10 (permalink)
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Re: Any actual effect of adding Spoiler?

Originally Posted by Salival View Post
there's many types of spoiler in the market... each n every one hav diff purposes, but all of them hav a common function=generate downforce... a spoiler is not really necessary in all cars... especially front wheel drive cars, as it lifts the front wheels off the ground, causin less acceleration... if u really wan lots of downforce, traction, the stuffs u could do with a spoiler, u could go with a front spliter(i m not sure bout the spellin) but basically its a large lip which is fitted in front of the car... a properly designed spliter could make ur car turn faster, more agressive, so on n forth...
Spoilers do not lift cars off the ground, especially during acceleration. These spoilers do not come into actual action until at high speed, only you can feel them. Only extremely powerful cars i know of can pull the front wheels off the ground. And these are rear wheel drive cars. Spoilers come into action at higher speeds, which is means in SG, its actually of no use or doesnt serve its function. For functionality, maybe you can ask a driver who has been on track on e same car with and without a spoiler. A spoiler will plant the car more firmly to the ground.


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Old 23rd April 2009, 03:00 PM   #11 (permalink)
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Re: Any actual effect of adding Spoiler?

streamline ~
lol , but in sg , its mostly for show.
you see some sports car dont even have spoiler but also so fast and nice

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Old 23rd April 2009, 03:08 PM   #12 (permalink)
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Re: Any actual effect of adding Spoiler?

Spoiler makes a car look out-of-place

Spoiler-less = looks more streamline, looks better

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Old 23rd April 2009, 09:10 PM   #13 (permalink)
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Re: Any actual effect of adding Spoiler?

Originally Posted by maplegames View Post
Spoilers do not lift cars off the ground, especially during acceleration. These spoilers do not come into actual action until at high speed, only you can feel them. Only extremely powerful cars i know of can pull the front wheels off the ground. And these are rear wheel drive cars. Spoilers come into action at higher speeds, which is means in SG, its actually of no use or doesnt serve its function. For functionality, maybe you can ask a driver who has been on track on e same car with and without a spoiler. A spoiler will plant the car more firmly to the ground.
Yup. That's the problem for drag racers. At the start, maximum traction is required but the spoiler is producing 0 downforce. At max speed, maximum traction is not required, but spoiler is producing max downforce or max drag. tts why we seldom see spoilers on drag cars. Top fuel dragsters have a small spoiler for added stability at high speeds, but tts all.

Originally Posted by Weztimonial View Post
streamline ~
lol , but in sg , its mostly for show.
you see some sports car dont even have spoiler but also so fast and nice
Those without spoilers achieve the same effect using the whole car to generate downforce. Actually, the amount of downforce a spoiler produces by itself is not that significant. The overall aerodynamics of the car is the main contributor to the downforce, because the surface area under the car is alot bigger.

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Old 23rd April 2009, 09:17 PM   #14 (permalink)
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Re: Any actual effect of adding Spoiler?

Ok so now we all know the technicalities of a spoiler. Let me share my experience.

I used to have a spoiler on my vios but did'nt show any good effects in my sepang trip.

I strip it, reduce my front suspension to 1/2 finger and rear, 1 1/2 finger.

Ran NS highway at 200km/h no problem.

Normal driving in singapore, sorry i honestly think it's for cosmetic.

Alternatively you can add front fins, make some holes at your rear bumper for air dynamics

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Old 23rd April 2009, 09:44 PM   #15 (permalink)
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Re: Any actual effect of adding Spoiler?

hmm.. jus curious, were u on a GT wing?
and did u have to fill up the holes after removing the spoiler? or just put a screw to cover it up.. =/

i've a thing for GT wings somehow, esp those really tall ones or at least taller than the roof. Just feel they bring out some aggressiveness out of the car.
but don't like the idea of drilling my boot. clean backside is also nice..

maybe nxt time i'd get one and a spare boot to drill. also can use to put drinks and hang towel after washing car.

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Old 25th April 2009, 03:08 AM   #16 (permalink)
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Re: Any actual effect of adding Spoiler?

Originally Posted by vios21 View Post
Ok so now we all know the technicalities of a spoiler. Let me share my experience.

I used to have a spoiler on my vios but did'nt show any good effects in my sepang trip.

I strip it, reduce my front suspension to 1/2 finger and rear, 1 1/2 finger.

Ran NS highway at 200km/h no problem.

Normal driving in singapore, sorry i honestly think it's for cosmetic.

Alternatively you can add front fins, make some holes at your rear bumper for air dynamics
You ran 200km/h on a Vios? I'm interested as to what mods you did and where.

Basically, I'm looking for a good workshop for NA tuning. PM me if you prefer.

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Old 25th April 2009, 03:11 AM   #17 (permalink)
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Re: Any actual effect of adding Spoiler?

Spoiler is more for aeroplanes i guess...

For cars its purely for the looks..Thats what I think although it might not be true

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Old 25th April 2009, 06:54 AM   #18 (permalink)
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Re: Any actual effect of adding Spoiler?

Yah, i learn from school is that the spoilers are used on aircraft.
Maybe if you wan your car to fly =D
Becareful, cos the rsaf will shoot ur flying car down =P

Oh yeahz typeX i got revocated and posted to rsaf muahahahah

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Old 25th April 2009, 09:11 AM   #19 (permalink)
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Re: Any actual effect of adding Spoiler?

Originally Posted by Apocalyptic View Post
You ran 200km/h on a Vios? I'm interested as to what mods you did and where.

Basically, I'm looking for a good workshop for NA tuning. PM me if you prefer.
U drive vios too? It's my previous ride.

There's a thread where i shared what i did.

It's under modifications.

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Old 25th April 2009, 11:37 AM   #20 (permalink)
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Re: Any actual effect of adding Spoiler?

Originally Posted by greenapples View Post
Yah, i learn from school is that the spoilers are used on aircraft.
Maybe if you wan your car to fly =D
Becareful, cos the rsaf will shoot ur flying car down =P

Oh yeahz typeX i got revocated and posted to rsaf muahahahah
cool.. did u take aero engrg?
haha, shiok.. as a tech? btw.. is it still a long way to ORD? =x

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