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Beaner242 03-17-2009, 03:26 PM So I have a single 18" air horn off a Kenworth. My question is, what would make it louder. I have a ViAir compressor with a 75 on 100 off switch. A second trumpet the same size. (FREE) More air pressure like 150lb. (Cheap Switch) More air volume IE (bigger air line) Mad Maxx 03-17-2009, 04:24 PM Bigger Tank, Bigger Line, more PSI, but not too much because then it'll Sound like Crap. Beaner242 03-17-2009, 04:33 PM OK how much is to much? Not sure what kind of pressure a big truck runs. I have a tank also that I forgot to mention. I thought about taking the second trumpet and cutting it down to change its tone. heymccall 03-17-2009, 04:36 PM The air in a tractor trailer runs at 120 psi. And, that's what the horn sees, also. Beaner242 03-17-2009, 04:40 PM I prob wont mess with it then, I dont think another 20lbs would make that big a diff. Mad Maxx 03-17-2009, 05:20 PM A new Pressure Switch would be the Easiest and Cheapest Upgrade. Get one that clicks off as close to 120psi as you can. IIRC they make a 120psi or 125psi. Put that in and see if you notice a difference. In not, then a bigger Tank and Lines are the next Step. If that doesn't do it, you need a bigger Horn or more. Beaner242 03-17-2009, 05:33 PM its pretty freakin loud right now. ill prob just leave it alone. i mounted it behind the grill pointing at the ground so if your in front of it, it will ring your ears. LOL rich909 03-17-2009, 06:16 PM I did mine 3 train horns it was loud. I wanted it louder 1/2 lines and fittings. Made a huge difference. That thing is Loud!!!!!!!!!!!!!!!!!!!!!! Pure Diesel 03-17-2009, 06:18 PM The closer the solenoid is to the horn the louder it will be. Larger tank & hose helps also. | ||