I bought some of JB's '92-'95 brake ducts and installed them this weekend. I'm very happy with them.
The ducts were made by JB. You can contact him about buying some from the Honda-Tech thread here.
They fit really nicely into your factory fog light locations and have a 2.5" outlet. I ordered 12' of 2.5" neoprene hose from PegasusAutoRacing.com for about $65 shipped to Texas. It's supposed to be good for up to 300 degrees. Silicone hose, which is good for 500+ degrees, in the same length costs almost $100. The hose is pretty cool. The steel wire is strong enough to keep the hose straight for a foot or two under its own weight, but it can also tightly bend. It's good stuff.
Here's the passenger side of the bumper after being Dremeled out. Pretty much everything has to come out that's behind the little lip seen from the front of the bumper. I kept some of the fog light screw locations because I ended up using one of them...
JB gave me the ducts with threads molded into them and little bracket for support. I twisted the bracket a little and put a screw in one of the fog light holes. Here's the driver side with a close up of the bracket...
The inner diameter of the duct is 2.5" and the hose is also 2.5", which makes it impossible to get the hose in, or around, the ducting. I didn't even try pushing it because I was afraid of cracking the fiberglass. I found these "no hub couplings" at Home Depot. Theses worked great and are only a few bucks each...
They're labeled as 2", but the outer diameter of the rubber part is about 2 3/8".
The rubber snugly fits inside the duct and the hose will snugly go around the rubber...
Here's the passenger side with the bumper on, showing the ducts clearing the chassis and the clamp holding the hose and duct together...
Below is how I originally routed the ducts to some shop vac nozzles...
I never really liked that design and have since changed it. The ducting was long, traveled with the suspension and, while it wasn't that low, was low enough to where I could have possibly ended up dragging one to the pits. I had them like that for about about a year and they never came loose, though.
Here's how I've since rerouted the ducts...
Simple. That's aluminum flat bar that can be found at Home Depot. I bent the aluminum over the round bar that's on the front of my trailer, which was the perfect size for the 2.5" hose. Some self tapping screws hold it to the chassis and there's a zip tie around the hose, making sure it won't slide out of the bracket.
Here's the passenger side...
With a cold air intake, the ducting is right up against the filter. I wrapped some duct tape around the hose to keep them from wearing into each other.
I think routing it like this is a lot better for a few reasons:
- Less complicated, doesn't travel with suspension
- Higher off the ground
- Easier to quickly remove the bumper
Rather than trying to put air directly on the rotor, like I had it, which was probably less effective, this way should allow more air into the area and keep the caliper cooler.
It's hard to tell if they're really beneficial. 11" brakes don't need these ducts, even with R-comps, but they're there. I have yet to do a proper test, which would involve taking temps with one duct taped off, etc.
I like 'em, though.
