Rear Brake Ducting

[DanO]

At the track, my rear brake temps (TAROX 6 front/rear+biasing) run about 200 degrees F hotter than my fronts (front has been modified for good airflow). Does anyone use rear brake cooling ducts/deflectors? If so, can you please provide details of the product/installation?

Thanks,

DanO

 

[Yellow Rose]

Go To The Porsche Dealership

Hi Dan - in the DIY within this forum, there is a discussion about air deflectors for our brakes. It mentions Porsche OEM deflectors for their 993 / 996. I used to have them on my car.....I think they were something like ten bucks each.

On the fronts, you can use an insert that is molded into the Porsche deflector as one threaded attachment point. You'll have to drill a hole in the plastic deflector to screw into the other attachment point of the NSX's lower control arm.

As you know, there are no threaded mounting bosses on the rear lower control arms. I drilled two holes in the Porsche deflector and zip-tied them to the control arm.

On days that it will be approaching 100 °F at the track, and knowing I'll be the fastest driver out there, I supplemented airflow with 2-1/2" duct from Porterfield.

 

[DanO]

Thanks for the info on the front brakes, but I am particularly interested in the REAR brake ducts/deflectors, because as you said, the fronts are relatively easy to do as outlined in the FAQ and with various vendor products. However, I have not seen or heard of much regarding REAR brake cooling and I was wondering what (if any) people were doing to cool their rear brakes… I’m going to do something to resolve the problem within the next couple of weeks and just want to survey the people who have already tackled this project or can offer helpful advice regarding rear brake cooling.

Thanks,
DanO
. I am par

 

[ncdogdoc]

Dan,

I have two plans for the track car, but neither has been confirmed by actual placement or use.

The first is to use aftermarket side steps and connect a 2" flexible pipe from the rear "duct" to the parking brake attachment point to try and force air into the center of the hub.

The other is to use a NACA window style duct mounted below the gas tank facing the track, with flexible ducting again traveling to the rear hub in some way.

Sorry that they are not really fleshed out yet, but I will be putting all of my suspension, floating hat discs and braided lines on the car over the next two weeks and hope to work out both front and rear ducting. I will try to remember to take pictures.