40 buck brake duct kit

[p0cket penguins]

So I bought some Allstar 3 inch brake duct and decided to make my own ducts.... The pictures below are missing the bracket where the hose connects to the strut.... I basically took the duct and ovalized it a bit for clearance and then took two worm clamps and bound it to the strut.... I have drive on them for 2 weeks and they are still perfect plus I have no rubbing.

[PhillyG]

Looks like it will rub when the wheels turns in.

[asubimmer]

as cool as you might feel w/ these, they are pointless.

One, the air is just blowing on the rotor. You need a plate so the air is forced into the middle of the rotor and forced out of the fins.

Two, you don't need these on the street. Infact you if they were actually doing anything, ie pt 1, you would more than likely be over cooling them on the street.

And three, you are just dumping air under your car. More air under your car = more lift...

[p0cket penguins]

Looks like it will rub when the wheels turns in.

they do not rub at all while at full lock

[p0cket penguins]

as cool as you might feel w/ these, they are pointless.

One, the air is just blowing on the rotor. You need a plate so the air is forced into the middle of the rotor and forced out of the fins.

Two, you don't need these on the street. Infact you if they were actually doing anything, ie pt 1, you would more than likely be over cooling them on the street.

And three, you are just dumping air under your car. More air under your car = more lift...

1. the car is a track car

2. the hose is always facing the middle of the rotor in the vained portion... even the hose is ovalized to have maximum surface area on the vained portion...this idea was taken from the spec 30 forums ... plus a metal backing plate dosnt make a seal so there is no reasonable way you can say the air is directed into the center at all times... its probably just insulating a layer of hot air between the rotor and itself

3. the car comes with stock brake ducts thus by directing the air into the wheel there is less lift.... yet i feel that the difference is negligible

[asubimmer]

1. the car is a track car

2. the hose is always facing the middle of the rotor in the vained portion... even the hose is ovalized to have maximum surface area on the vained portion...this idea was taken from the spec 30 forums ... plus a metal backing plate dosnt make a seal so there is no reasonable way you can say the air is directed into the center at all times... its probably just insulating a layer of hot air between the rotor and itself

3. the car comes with stock brake ducts thus by directing the air into the wheel there is less lift.... yet i feel that the difference is negligible

It depends who you buy the plates from. Good ones are made to fit VERY close to the rotor. There isn't a way to make a seal from the rotor to a backing plate :???:. If there was it wouldn't make much of a diff. Although having a backing plate and not IS a big diff. The plate does a much better job directing the air through the rotor.

If this really is a track car I suggest not half assing the job so you don't hurt yourself or others. Its ok to do things cheap as long as what you do isn't cheap...

[Jordan325iC]

^^ Seriously? Let's not be melodramatic, ineffective brake ducts aren't going to hurt anybody.

[asubimmer]

^^ Seriously? Let's not be melodramatic, ineffective brake ducts aren't going to hurt anybody.

on the street prob not, but on the track where speeds are much higher yeah... Not everyone has million dollar budgets to race but that doesn't mean you should take a beater to the track.

Think about this OP:

Face a fan at a wall. Where does the air go? Most of it will bounce back where it came from, ie dumping large amts of air under the car. Very little will go down the sides of the wall, ie "out the fins". Now take the same fan and duct it so the air can only go along the wall. Where does the air go this time? Down the sides of the wall, ie "out the fins".

Fading brakes and air dumping under your car causing lift = a disaster waiting to happen.

[andyman2487]

air dumping under your car causing lift = a disaster waiting to happen.

Haha wow you're a moron.



That's like saying the drag force caused by air pushing on the front end of your car will cause a moment about your rear wheels, making the car backflip. We're all doomed!!!!!!!

[p0cket penguins]

It depends who you buy the plates from. Good ones are made to fit VERY close to the rotor. There isn't a way to make a seal from the rotor to a backing plate :???:. If there was it wouldn't make much of a diff. Although having a backing plate and not IS a big diff. The plate does a much better job directing the air through the rotor.

If this really is a track car I suggest not half assing the job so you don't hurt yourself or others. Its ok to do things cheap as long as what you do isn't cheap...

what your saying is the a ton of spec e30 people are wrong .... they fit close to the rotor yet not being able to seal it... thus if the rate of the air is moving too fast it will leak between the plate and the rotor cooling off the rotor..... either way i dont think there is much difference .... also the job is not half assed... its just a brake duct chillax

[p0cket penguins]

on the street prob not, but on the track where speeds are much higher yeah... Not everyone has million dollar budgets to race but that doesn't mean you should take a beater to the track.

Think about this OP:

Face a fan at a wall. Where does the air go? Most of it will bounce back where it came from, ie dumping large amts of air under the car. Very little will go down the sides of the wall, ie "out the fins". Now take the same fan and duct it so the air can only go along the wall. Where does the air go this time? Down the sides of the wall, ie "out the fins".

Fading brakes and air dumping under your car causing lift = a disaster waiting to happen.

and if the backing plates dont make a complete seal then the same scenario is attained.... ;)

[PhillyG]

on the street prob not, but on the track where speeds are much higher yeah... Not everyone has million dollar budgets to race but that doesn't mean you should take a beater to the track.

Think about this OP:

Face a fan at a wall. Where does the air go? Most of it will bounce back where it came from, ie dumping large amts of air under the car. Very little will go down the sides of the wall, ie "out the fins". Now take the same fan and duct it so the air can only go along the wall. Where does the air go this time? Down the sides of the wall, ie "out the fins".

Fading brakes and air dumping under your car causing lift = a disaster waiting to happen.

are you fucking serious?

[asubimmer]

and if the backing plates dont make a complete seal then the same scenario is attained.... ;)

nope. Most of the air with a backing plate goes through the fins. Most of the air doesn't go in the fins w/out. A backing plate won't get all of the air in the fins but it is MUCH more efficient.

[p0cket penguins]

i feel that the difference in efficiency ratio and cost is negligible .... and if it was so substantial i wonder why most spec 30 people run the same thing im running .......... the world may never know..... i feel you have already tarnished your credibility with the gonna lift the front end theory..... thus if you dont like it cool you dont HAVE to run it ....... ;)

[asubimmer]

Haha wow you're a moron.



That's like saying the drag force caused by air pushing on the front end of your car will cause a moment about your rear wheels, making the car backflip. We're all doomed!!!!!!!

I didn't say the car way going to take off like an airplane. But more air under the car does increase lift. Which on the track means snap understeer, oversteer, or traction in general, etc...