Guys,

Have a strange problem here that I'll attempt to describe for you folks. A little background: I have a 99 C5, Magnuson supercharger, headers, Spec twin-disc clutch...

I am hearing this distinct humming sound when the engine is under load. I don't hear it when accelerating through lower gears, though. I mainly hear it at speed - say, 40MPH or faster when I'm lightly stepping on the gas. It's a VERY pronounced humming on the highway at speeds of around 70MPH and in 6th gear (when the engine is under the most load). I don't have to be accelerating very fast at all. In fact, just lightly tapping the accelerator at those speeds will produce the humming.

If I press in the clutch, the humming immediately goes away. If I let off the accelerator, again, the humming goes away.

What worries me here is I experienced a similar problem a couple years ago and it turned out the supercharger needed to be re-built (again). If this turns out to be the Magnuson again, I'm done with them. I shouldn't have to send the unit back 3 different times in order to keep it working. I don't even drive the car THAT hard, either.

Just wanted to see if this might be anything else that you can think of. I need to find a shop here in Tucson who can take a look at this. I don't want to have to drive up to Phoenix if I can avoid it.

Thanks.

 

I didnt think the magnuson give all that much problems. If you gotten into it much at all very hard I would look at that clutch again. I would think if it was the unit and bad it would be doing it all the time just maybe more under load.. Hope it no much on her man.

 

I've had quite a few issues with mine. I originally bought it as a refurb, which was probably my first mistake. But, it was supposedly sent back to Magnuson for an overhaul, so buying it that way wasn't really much of a concern for me. But, I've sent it back 2 times already since 2004.