Just installed a cageless 4lb lower pulley, struggled with the 67" belt for a while till I broke that casting piece of the tensioner. I now notice that with the A/C on and the truck at idle, theyre appears to be more "noise or a low murmur" when your inside the truck, and that it disappears once you accelerate. Ive checked the pulley and it appears to spin straight and not wobble. Could I have damaged one of the idler pulleys in the middle by torqueing them down too tight? Or is this due to the fact that its a cageless and there's nothing to dampen the sound of the supercharger and pulleys? I know that there's suppose to be more noise when you get on it, but is this murmur at idle normal also? Thanks in advance.

 

Mine sounds like a Desiel on Idle
For some it's the marble in the Can sound
I think they call it cavatating ???
If you touch the gas a little and bring up the RPM's,
it goes away RIGHT ?

It's normal for most with aftermarket pulleys
Nothing to worry about

ENJOY THE NEW POWER

 

Thats why the factory lower pulley has that large rubber damper on it.
If it bothers you and your running a chip, you can have the idle moved up

 

Thanks for the info guys, thats what I was hoping was happening. Have a great Easter

 

Mortis, did you make it to the canned food drive yesterday at the old costco in Salt lake?? I was gonna go but I had to work.

 

Dirtchicken,
No, I didnt get to either, I had an errand to run at 9:00, and I didnt read the email from DJY, till last nite. Kinda wished we could've gone though, just to see a "Hawaii Lightning" family reunion