15 replies to this topic

[petrolhead1]

From all I have read on here there is a well supported school of thought that front brake cooling can make a big difference to performance and that the foglight mod is very effective. I would like my car to look as standard as possible but would ideally take advantage of increased airflow to the disks and wondered whether there is any way of creating a similarly effective duct to blow up from the underside of the car rather than either foregoing the foggies or cutting great big holes in the front of the clam. I was speculating about the possibility of a NACA slot in the undertray or the underside of the clam in front of the front wheels and a custom made duct leading straight up to or through to the disk. To be as effective as possible I presume it needs to have a pretty straight path onto the disk. The other option was possibly to attach a duct to the hub that would scoop air from the flow under the car and bring it up and round onto the disk face. This could be as simple as some round pipes cable tied onto the tube sections(sorry not sure of the technical term for these) that attach to the hub with the intake angled down into the airflow and the outlets facing the disks. Effectively the foglight mod but taking air from the underside rather than the foglight area. Not a clue whether this is feasible or how effective it would be. Anyone with any views or suggestions please feel free to offer them.

[VIX]

The other option was possibly to attach a duct to the hub that would scoop air from the flow under the car and bring it up and round onto the disk face.

Thought I read somewhere that the air flow needs to be to the vanes between the disk faces ie the front edge of the disk not to the disk face itself.

[Dave]

The other option was possibly to attach a duct to the hub that would scoop air from the flow under the car and bring it up and round onto the disk face.

Thought I read somewhere that the air flow needs to be to the vanes between the disk faces ie the front edge of the disk not to the disk face itself.

How about sagaris style vents combined with fog light option with the S2 vent behind the wheel arch?





Dave

[Jase_MK]

Cooling vents like these...

Edited by Jase_MK, 30 June 2006 - 10:50 AM.

[petrolhead1]

I just found this quote from Tarmac Terrorist in an earlier post.

If you are going to cut dirty great holes in your cars in order to feed ducting for cool clean air to the brakes, then could I please recommend that you fit them correctly.

I see in the pictures above that Ricky has fed the end of the hoses directly onto the disc face, this is wrong.

The hose should be ran up to the centre of the bell so that the clean air gets pulled into the vanes and cools the discs evenly from the centre out.

By leading the hose onto the inner face you are effectively cooling the disc more on one side than the other, giving an un-even cooling rate.

Gav

All the fog light mod pictures I have seen show the air blowing on one disc face rather than aiming it at the centre. So that suggests the air flow through the disk vanes is from centre ie hub area to outer edge of the disk.

Richard

[petrolhead1]

C'mon guys no one's offerring any real serious technical advice! Bear in mind a few years down the line we could be like the jaguar onwers club where such things as brake cooling devices are acceptable but only if they are strictly out of sight! I lay under my VX tonight as one does after a few beers and mused. There is a big chunk of clam there just behind where the VXT splitters will be fitted (eventually). It would take a humungus double pipe NACA duct for brake cooling. OR I saw some bits for some Evos on the web which are soooooo simple. A big duct they hang off the front suspension wishbones that drive air straight at the disk. Any thoughts on either of these ideas?

[Thorney]

The foglight method is the simplest route and it does seem to work quite well especially when pointed at the centre as Tarmac Terrorist described. Cyberman has added ducts to the front of his clam amd reports good effect but I think this maybe too visual a change for you. The idea of ducts in the undertray might work but brake cooling needs volume of rather rather than high speed air so I doubt you'd get as much that way, it also would mean the removal of the front chassis plate (can be re-fixed) to cut hols for the ducts. Rear ducting in the arches might help I guess but you'd need to remove the wheel arch liners as well so you might suffer from greater fibreglass damage from stone chipping. Ducts in wheel arches aren't really fro brake cooling but for air pressure levelling on very low race cars so on the TVR for example its primarily for looks - does look smart though.

[djegiant]

Cooling vents like these...

Is that a photochop????

Exige spoiler looks ace!

I want one!

[mandarinvx]

Surely cooling the disc from only one side could cause warping/distortion of the disc and uneven pad wear

[2-20]

Do you think it could be possible to get the cooling flow from inside this part ??
Would it be detrimental to the engine cooling ??

[mandarinvx]

I think you have answered your own question there! I'm sure the increase in radiator temperature will have a more detremental effect compared to the minimal performance gains from adding a cooling hose from this area (albeit running temps only raised a degree or two) This effectively means that the engine bay area will be warmer, hence higher induction temperatures etc and a less responsive car... All in, the front air intake (through fogs or hole in the clam itself) is probably the best option.

Something like these look like they would create a more even flow over the disc, though maybe in a different colour!

[TarmacTerrorist]

This is a nice appproach by Uldis from exiges.com, only clen air is put to the discs rather than it picking up dirty hot air form inside the arch

http://smg.photobuck.../?sc=1&multi=10

he has some blanks to cover the intakes up when not on track

Edited by TarmacTerrorist, 05 July 2006 - 11:58 PM.

[Thorney]

Surely cooling the disc from only one side could cause warping/distortion of the disc and uneven pad wear

Potentially yes but this would only be the case for solid disks, the AP's/aftermarket are two disks with cooling vanes inside which 'wick' the air though the centre.

Mind you the outer part of the disk gets more air through the wheel so with inner brake ducting its more likely you're just redressing the balance.

[TarmacTerrorist]

Just think of a vented disc as basically a fan impellor without a housing, air sucked in at the middle and expelled at the disc edge. This is why you get left and right hand discs so that the veins pull the air through in the right direction, that is of course unless you have an s2 elise/exige and then you have 4 right-hand discs on the car (cheapskatebastards), poor show lotus!! I thought they had put the wrong ones on but no, they are all like that....2 going the right way and 2 going the wrong way!!! Presume the VX uses a disc from the vauxhall range?? does it have dedicated left and right discs??

[Smiler]

yes same disks

clicky

[Joe-Turbo]

could try buying some of these flashy new alloys from saab. apparently the way they are designed they cool the brakes

(scroll around the car the press on the wheels)

http://www.saab.com/...en/index2.shtml