Ever since i hooked up my big rig kit, I =have had this issue and am wondering how I can fix it.
I have a 275c with a 2.5 gallong tank and a set of horns, it is wired to my truck horn switch

If I tap the horn it sounds great, but if I lay on the horn it drops the sound of the horn as like it is hoarse. I checked my tank and pressure gauge while my wife blew the horn and its not running out of air, it starts at like 140-145 and sounds horrible if held down.

How can I fix this?

 

This is my kit
http://www.assuredautomotiveproducts...IR275c-25G.htm

 

how big of hose?

PM coobies, hes pretty good with train horns.

you go to auburn?

 

wouldnt that just be because you are out of air in the tank?

 

lol.....duh
you lose air when you honk the horn......and thats why you have a compressor......it fills the tank back up.
imagine blowing through a straw...of course when you start its going to come out hard and fast....but after a few seconds its going to get weaker and weaker until you take another breath.

 

I thought that sounded right, i didnt know if i misread the question. just get a ten gallon tank and you will be able to hold it for a couple seconds.

 

10 gallon on 140psi down to whatever his pressure switch is at. and im guessin 1/4" hose....he could hold that down for a good while....like 20-35 seconds.

 

1/4 line, it just sounds like it boggs down and its not out of air the gauge is still reading 135+,


It can be full at 150 psi and if I hold the horn down it sounds good for maybe a second then sounds like crap, maybe I do need a bigger tank, but I would think I could hold it down for 5-8 seconds before running out of air

 

does it matter how far the tank/compressor are from the horn? I have the horns in the front and comp/tank in the tool box.

 

thats a lot of air moving. 2.5 gallons is nothing.

 

yeah that tank isnt big enough those horn will suck the air real quick i have a set on my show truck with a ten gallon tank but im using nitrogen instead of compressors cause i use the nitrogen for my air ride i have my regulator set a 350psi and thats how much psi im running for the horns also its loud as He$$

 

I think I know what your talking about, I was having the same problem with my old horns. It honks at first, then it starts making a screaching noice, my problem was my air valve, it wasn't opening all the way up, and that was with a 5 gallon tank and it would start screaching after a couple seconds.

 

Finally someone knows what Im talking about, what did you do to fix it, I ruined my horn by experimeenting so I have to order a new horn tomorrow

 

I have a 20 gallon tank, and I can blow my horn for almost 20 seconds. If I had a 2.5 gallon tank, it would only be about 2 seconds. Get it? It's also possible that you need a better solenoid valve. Some of them are really cheap. A good one will run you $50 or more.

 

I ordered a new horn with new valve if that does not work, Im going to order a better set of horns with a better solenoid