gregh

I've read on the driving techniques web site that you can add 3" tube to the underside of the car and point the other end at the centre of the disk eye.

Has anyone done this on a Impreza? Would it help brake cooling, or would the cool air just hit the wheel?

Cheers,

Greg

johnfelstead

I think a brief explanation of how brake disks work will help.

Most modern brake disks are ventilated; they have air gaps between the 2 surfaces that the pads clamp against.

The way they work is when they are spinning they act as a centrifuge and force air from the eye of the disk out through the vents and into the wheel rim area where the hot air is dispersed.

The aim of installing some ducting to the centre of the disk eye is to feed ram effect cold air in to improve the efficiency of the cooling process. It does work, on our racecar we also cool the callipers using ducting but that’s a bit OTT for a road car.

The disks used on up rated kits like AP racing use a spiral vent to improve the efficiency further, it always amazes me how often I see these installed back to front, they are handed left/right.

It’s a very simple mod to do on a track day if your brakes are a bit marginal.

Read

gregh

Cheers John,

I'm just trying to picture how this would work on an Impreza, and where the 'exit' end of the pipe would sit and be fixed.

I can see how I can attach it under the lip of the front bumper, it's the other end I'm struggling with, probably as I'm not sure where the disk eye is and how you ram air there without the tube touching the wheel!

Perhaps if I buy some tube you can show me on Sunday

Stef

Scoobies also have a metal plate inside the disc which would hinder any such mod.
I have had a section of mine cut away for this purpose but have yet to take advantage of it.
Maybe Sunday.....

Stef.

ColinU

A friend who races Citroen 2CVs (yes they do race them!) told me of a neat trick they do to help cooling their brakes. As well as ducting cold air to the disc/caliper, they bolt a chunky heatsink (courtesy of a computer power supply) to the caliper via the existing mounting bolts. Apparently it works a treat!