I just installed a set of Supertones in my '09 this past weekend (300/500Hz).
The wiring write up on NASIOC was pretty good, all I really needed to know was where each spade on the relay was supposed to go to.
Spent a lot of extra time making my harnesses and doing it right. Crimped, soldered, heat-shrunk, and loomed all wires, and wrapped them up with some nice zero-degree 3M electrical tape I found at Home Depot. Zip tied the loomed wires out of the way, now things look stock...except for these two red blasters poking out of my grille.
I installed them both without removing the front bumper. Removal of the grille wasn't
too bad, except for a little publicized fact about the plastic sliders behind the grille. After you remove the four screws from behind the grille, the thing is still attached to the bumper without any obvious connection points to hit. I only found one post on another forum that mentioned these sliders that release the grille from the bumper. I wiggled them back and forth and the grille popped out.
Other issue I had was mounting the right side horn to the radiator brace. The left side horn mounted up fine using the OEM horn's 12mm bolt. The right side horn was a pain. I ended up using a M7 bolt and somehow got a nut to go on behind the brace, then tightened that up. The radiator grille screen would not budge, so the back of my hand got a nice sharp metal massage while I did that.
In any event, I'm still looking for a place to mount the relay. I'm either going to bore out the relay's existing hole and use a bolt in the engine bay, or drill a hole through the fuse box and mount it there. Not sure. The harness and loom have it stable and staying in one place for now.
Not sure if the German made horns are different, but none of the spade posts on the Indian manufactured horns I used were labeled + or -. I'm not an electrical engineer (but one of my best friends is) so I'm not sure if that really matters or not, but I tested them out one at a time and later marked them myself with a pen.
These things are great. Using the relay definitely makes a difference. I installed the PIAA Sport Horns on my Miata a while back. The differences are that these seem to be a LOT louder. Plus, the PIAAs were made of plastic. They would (obviously) sound weaker on hot days. But, whereas the PIAAs sounded like a PO'ed Manhattan cab, the Hellas seem to pierce a lot more. I've already gotten to use them in day-to-day driving and as far as I'm concerned, they've paid for themselves. Got them from SubiMods and they arrived in a day! If anyone has any questions, shoot me a PM.
Topic: [HOW TO] Hella Supertones (Read 958 times)