Feedback on brake cooling idea.

[PorscheGuy79]

After quite a bit of research I have finally found a set of new prototype backing plates for my Carrera brakes that are going to work great. As far as getting the air to them I have seen a lot of people run the tubing through the air arm, but I was considering another idea. I saw the picture below in a thread talking about oil cooler venting but I also noticed the brake cooling hoses. What are your thoughts about cutting some 3in holes into the front trunk area to run more efficient tubing to the brake backing plates as well as simplifying how they will run. I am curious to hear your input on this. Can you see any cons to this method, besides a decrease in trunk space which isnt important to me. I would be running a stock fuel tank so space might be an issue, I will have to check and see.

[ZOA NOM]

It looks like a cleaner solution. The hoses and hardware wouldn't be exposed to the elements, and there's less crap under the car.

[PorscheGuy79]

Originally posted by ZOANAS
It looks like a cleaner solution. The hoses and hardware wouldn't be exposed to the elements, and there's less crap under the car.

My thoughts exactly. My car is allready low, I dont need crap gettin ripped off.

[ZOA NOM]

If you have the room, go for it. I have an extra valance that I've been mulling over venting ideas for. I don't know if I have the balls to run the hoses inside though. It's my daily driver.

[Jeff Alton]

I like the idea very much. I am planning something similar. I would love to see a pic of that car inside the fender well. Like to see what they did there.....

Cheers

[PorscheGuy79]

I had a good friend express concern for the structural soundness of the chassis after drilling the 4, 3" holes in the softer parts of the trunk area. Can anyone tell me if this indeed does compromise the integrity of the body. My gut says no, but I know there is more knowledge out there.

[len911]

Here are my custom made Home Depot sheetmetal, pop rivetted ones on my car... Seem to work well! Made reducers for air dam too and A-arm through tubes. Also, backing plate to keep the air in. And some rear air diverters from mud flap material. I'm giving away all my secrets! Lou

[911pcars]

As others have said, running brake cooling air through the trunk cleans up the underside and avoids ripping pieces off during off-track excursions.

However, plastic or metal tubes should provide better air flow and volume due to their smoother interior walls.

Sherwood

[ianc]

Ixnay on cutting-up-the-tub, eh?

ianc

[na2ub]

However, plastic or metal tubes should provide better air flow and volume due to their smoother interior walls

Funny thing. I was at the bearing supply store today, and I was flipping through a catalog of hosing products while waiting (I think it was called Flexuast). Anyway, I saw a few of the orange flexible hoses that had the spiral ribs constructed on the outside of the hose, specifically designed to provide smooth inner walls. I didn't get to see the product, but it seemed like a cool idea. There were even some rated for high temps (heater hoses).

Doug

[Wil Ferch]

Doug:
If you look a t places like Aircraft Spruce and Supply you will see SCAT and SCEET aircraft quality silicone hoses....some with single layer construction and some with dual layer ( wire in - between).....to promote smooth interior flow.

Catalogue is like a candy store !!

- Wil

[HawgRyder]

I use SCAT for the hose between the heat exchanger and the body (heater control).
Works like a charm and is very easy to bend.
Bob

[Wil Ferch]

We need to engage Steve Weiner on this thread....I think he ( and his shop- Rennsport Systems) suggests routing hose through the trunk whenever possible...

-Wil

[acapella8]

What a great thread, I am learning as I surf.

[Steve@Rennsport]

Hi Wil:

LOL,...I've had a LOT of customers who rip away the commonly available brake cooling scoops & hoses several times a season to their detriment of their pocketbooks,....

Those brake cooling kits are cheap and fairly effective, but they are not the end-all solution for controlling rotor & pad temperatures.

Although only possible for the 911 ('65-'89), I prefer to route the cooling hoses (3") through the trunk compartment and plumb them directly to some custom brake backing plates behind the struts and steering arms. This is really only feasible when using a fuel cell where you have the room on each side of the cell, just like in that picture of the yellow 911 race car, above.

We cut the holes in the inner fender and weld in some spigots for the hoses to clamp to. This give you two hoses per side: a long one from the spoiler to the spigot and a short one in the wheel well that easily replaced should it become damaged. The spoiler needs two openings that permit high-pressure air into the hoses.

For 964's, we've used a similar system but use the openings in the frame rails to route air to the fender well spigots and short hoses to the upright.

These solutions work very well as proven by temp-measuring paint and noting the drop in peak rotor temperatures,.....

[Wil Ferch]

Steve:

I really appreciate you coming into this discussion.....

Going further...what can you recommend for a street/DE car that uses the OEM tank?..... some of us might not mind cutting into the internal body work for a nice street car.... if the end-result is professional.

- Wil

[livi]

I had the impression the stock brake system was more than adequate on the SC/Carrera for street driving and even some DE activities.

Wrong impression ?

[Wil Ferch]

... a lot depends on the circuit ....and YOU...how you use the brakes....and how hard you drive....

yes...for DE, it can still end up being a problem....

- wil

[PorscheGuy79]

I can drive pretty hard when I want to on the track, and im only getting faster.

I dont have a spare tire so it does give me a little more room with the stock fuel tank to cut and route tubing. I also have the front bumper to accommodate the plumbing. My real question to you Steve is do these modifications affect the structure of the car and is there any added support required to do this modification.

[Chuck Moreland]

Routing the hoses through the trunk is great for all the reasons above. But I would not intake the brake cooling air from the oil cooler airbox, as the picture above apppears to. Provide seperate intake ducts for the brakes.

Why? Because if the brakes are the only outlet for the oil cooler air, you won't get good airflow through the cooler. The brakes and hoses are too restrictive.

If you have other outlets adequate to improve flow through the cooler, you won't have pressure to feed the brakes. Airflow will follow the path of least resistance.

Create seperate, dedicated intakes for the brakes.