Stillen supercharger belt slipage
 

I have your added idler pulley with your special spacer! :)

It's something else that's causing the belt to not be tensioned...

Previous to the SC build I had lightweight underdrive pulley at the crank and overdrive at the alternator, I had those removed for the SC build.

The shop had to remove the alternator to install the pulley for it. Is it possible that the alternator had brackets that let it be moved by 1 or 2mm? Maybe they didn't position it perfectly, which didn't cause problems when the car was NA




Sent from my iPhone using Tapatalk

I'm not sure why there would be a tensioning problem unless a wrong diameter pulley was installed somewhere. Dumb question: have you made certain that the belt is routed correctly?

Are you using the standard K081088 belt or the HD version?

Everything is routed correctly. I used everything from NAPA belt to the Gates Racing belt. Not the HD belt though. All belts are not tensioned correctly.

If I had a correctly tensioned belt and it would slip I'm sure that the HD belt would be the answer. But my belt is not tensioned correctly.

I want to look into the alternator but before I do I would want to confirm that in fact it can be installed a few millimeters off


Sent from my iPhone using Tapatalk

Here is a picture of my tensioner with the HD belt.

The alternator does use a mounting bracket so you may be onto something.

Stillen supercharger belt slipage
 

Your tension looks perfect Tbatt. Mine has never been like that.

I'll try it and if doesn't work then I'll order the HD belt. At that point last thing I'll be able to think off as a reason is that that my belts stretch. But that seems extraordinary.

I'll check in two weeks after I'm back from vacation :)

I need to be ready for ZdayZ!!!


Sent from my iPhone using Tapatalk

I need to back the nut off mine and give it a bit more tension when I swap the new pulley and belt on. Not because of the pulley and belt, because it needs it anyways. Easy enough to do obviously but pretty sure I'll have to grab a second pair of hands to do it.

Yours is too tight?


Sent from my iPhone using Tapatalk

Mine is sitting something like this right now. Just a little towards the drivers side past those three bars. Not at home to take a pic.

Mine is the same exact spot. This means the belt is lose and the tensioner is pulling it too hard. I tried to adjust it with the bolt and could not. If you figure it out let me know!


Sent from my iPhone using Tapatalk

Has to be adjustable that way. Mine is where it is because I was trying to adjust it with the bolt when there was no belt in and it went to far - I just haven't adjusted it back yet.

When I get Tbatt's kit I'll address it then and report back if 'resetting' the idler position by that bolt worked or not, thing I'm confused fident it will.