George is right, belt length is hugely important with a procharger... you need a belt thats as small as possible. Think "fat guy in a little coat".

The 3.7 may not slip, I have never seen one run on a D1 in person. I know the 3.85 didnt slip bad, but there was belt dust everywhere. I will say this... even with a 12 rib belt on a D1 and a 3.25" blower pulley with a stock diameter balancer there were minor belt slip issues. That's with a kit that is literally made with a specific belt length in mind. The P1 and D1 may be similar units, but I think the D1 reaches the end of a 6 rib's capability much quicker.

 

Other thing is witbout belt slip of some sort youll have hurt cranks with a blower


Ever been around big roots blower like a 8-71 or 10-71? There belt is so loose at startup

If ya dont want slip go cog but hopefully motor is built for a cog setup and has crank support

 

when i ran my old 6 rib i ran a 113 length belt worked like a charm and like stated belt length makes a huge difference

the P1SC has a less aggressive impeller then the D1SC thats the only difference

 

Squeezed on a 111.5 belt tonight with the stock tensioner maxed out, and using a flat head to slide it on. That tight enough? I can turn the motor over with a ratchet on the blower pulley bolt

My next dilemma is the FMIC I decided to run, I can't seem to figure out a way to squeeze 3" piping around the radiator.. It's a 2006 GMC Sierra, obviously I need to cut the headlight buckets up, im starting to get frustrated.

 

There is some merit to this. I don't set the tension on my truck until it is warmed up.

 

if the tensioner is maxed out thats no good it needs some movement or your gonna be breaking belts and tensioners like its your job

the GMC has more room then a chevy the 99-02 is the worst i fit a 12x24x3 cxracing intercooler right behind my grille with some minor cutting

 

20k worth of my tensioner maxed and no issues...it will stretch under load

 

Got it figured out, the pass side will be easy, driver side was a bit of a pain though. Had to move the ecu, so have to find a place/how to remount it

 

i totally forgot i moved my PCM put mine were the battery mounts since mines in the bed

 

Anyone have 4" pulley they want to get rid of?