I get a strange whistling sound whenever I rev beyond 4k RPM. A friend’s hypothesis was that it is my amp picking up the sound and amplifing it and outputing it through the speakers. This theory doesn’t make much sense to me but I don’t know. Any ideas?
I get that sound too… but only above 5000 rpm. I’ve been told it’s the intake, maybe a leaky intake gasket or exhaust header gasket. It might even be some kind of vacuum leak.
Turn off your head unit completely (don’t just turn the volume down). Does it still make the sound? If yes, this will help centralize the problem. If it gets louder when you turn up the volume on your head unit then get a (power) line cleaner for your head unit, or it is your RCA lines that run to your amp. If your power is closer than 18" to your RCA lines for any extended period of distance, the RCAs will pick up some of the magnetic field around the power lines and translate it into a whine that changes pitch with your rpms. If it stays at a constant volume then it is your amps, either the signal is dirty or the amps have an insuficient ground. Your ground wires to your amps should be the same gauge as your power wire. Hope this helps if it is the stereo.
If its a high pitched whine heard through your speakers and escalates as you go faster, you need better grounds from either your head unit to the frame or from your amp to the frame.
I get a high-pitched whistling sound when I’m between 5800rpm - 6500rpm. This only started once I put in my intake. The intake is short ram, and it only has one vaccuum hose, which is going to the valve cover. Hope that assists you in some way?
flapjak, have you seen the whistling video I posted a couple of weeks ago? Does your’s sound like that?
93LS have you figured out what’s causing it?
I think mine was caused by the amplifier. I turned the head unit off and had no more noise. (I don’t have an independent switch for my amp) I put it back on and turned the volume all the way down and I heard the whistling sound again. It is an escalating whine starting at around 2k rpm. Hope this helps. Thanks.