Jason987.2

Hi,

Who makes the thickest ones?
I'm looking to add them after the first track day when the pads are worn some.

TIA

jdistefa

Use Gt3 brake ducts first (assuming you have a 987).

Jason987.2

Already have them, and fresh Motul fluid, and DTC-30 pads (have DtC-60 on order)
Boiled the fluid when the DTC-30's got real thin, at Laguna. Times got into the 1:47's, with NT-01 tires. So I had to lift when cresting at turn 1.

Bill Lehman

I tried Ti shims from Hard Brakes. Two thicknesses were available but I don't remember how thick. I tried the thinner of the two and did not notice any improvement. Olsen Motorsports ducts work..

Jason987.2

Thanks.

How streetable are the Olsen ducts? Do they scrape on every driveway? I have a 2009 Boxster S.

Bill Lehman

No issue with street or driveways. They replace the front rotor backing plates.

jdistefa

Best recipe for 987 brake cooling:

1. Olsen ducts
2. Gt3 ducts
3. Don't run brake pads below 50% (heat sink)
4. Cut front liner vents and replace with large hole mesh

Jason987.2

Thanks.
Anyone have a good link to (4) above?

Also, does the price of the Olsen ducts include the hoses? Where do the hose front ends attach?

jdistefa

No hoses included.

The main point is to flow more air through the wheel liner (from the rad) to feed the 'buckets' for the Olsen ducts.

You can add hoses but in my experience if you do all four things plus good quality brake fluid you will be fine.

Running your pads thin is a setup for overheating.

Jason987.2

Thanks.
The Olsen ducts also work *with* the GT3 ducts?

jdistefa

YES

Bill Lehman

In my 987.1 the front liner vents only had about 1/2 of the louvers opened. I opened them but did not go to the removal and mesh replacement although that has to flow more air.

Jason987.2

Will the louver / mesh modification improve airflow without the Olsen ducts?

TIA

Bill Lehman

Opening the louvers will improve airflow. The Olsen ducts direct it to where it needs to go.

Jason987.2

Hmm, doesn't the factory get the airflow from the position of the GT3 ducts that are attached to the lower control arms?