Pulley Size Recommendations and other stuff


How they work          diagnosing problems          porting and polishing          rebuilding nosedrives          Swaps and upgrades          Adding a boost gauge         

replacing needle bearings     adding a nosedrive drain          supercharger oil change          pulley size suggestions          links, references, and sources


By now we're assuming you know what supercharger you have (M62 or M90).  They're quite different in supercharger pulley applications as you're about to see.  The M62 uses a keyed pulley design which can be removed fairly easily with a standard 3-jaw puller.  The M90 uses a tapered shaft press-on pulley with no key, and requires a specialized pulley puller for removal.  But the problem really lies in the fact that changing to a smaller pulley isn't the magic wand for more power.  There are a MILLION factors that complicate this process.  There are always a few things to do first, and also a few things to do after changing pulley diameters. 

M62 Gen2 (1991-1993):

2.2" is typically the next step 'up' in performance.  But read these two articles FIRST:

Idler pulley sizes

WARNING before changing supercharger pulley diameters

 

M62 Gen3 (1994-1995):

2.5" (or 91-93 2.55" stock pulley) is typically the next step 'up' in performance.  But read these two articles FIRST:

Idler pulley sizes

WARNING before changing supercharger pulley diameters

 

 

M90 (1996-2003):

Depends on Generation of SC and other car-specific factors.  Please join www.pontiacbonnevilleclub.com (free to join, no advertising) and post your question in our Performance or Forced Induction sections.

 

 


How they work          diagnosing problems          porting and polishing          rebuilding nosedrives          Swaps and upgrades          Adding a boost gauge         

replacing needle bearings     adding a nosedrive drain          supercharger oil change          pulley size suggestions          links, references, and sources


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