Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Crank Pulleys
Thread: Crank Pulleys
View Single Post
Old 05-09-2007, 06:32 PM   #4
FF's Quadriplegic!
Rudel's Avatar
Join Date: Sep 2004
Fan#: 13465
Location: Tampa, United States
What I Drive: 2.3 ATX-RSVT

Posts: 2,897
Points 10,628, Level 68
Points: 10,628, Level: 68 Points: 10,628, Level: 68 Points: 10,628, Level: 68
Level Up 45% Completed
Level up: 45% Level up: 45% Level up: 45%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 15 Rudel Great Standing Member
Buy-Sell-Trade Rating: (17)

Is your Vortech on a SVT or ZX3 engine? If it's an SVT engine how much clearance to did you have between that and the water pump pulley? Looks like the belt almost touches each other between the 2 pulleys.

According to the calculation I made and from the manual.

The C-2 Procharger with the 2.55" Blower and 5.7" Crank Pulley @ 7200rpm will spin the impeller at 75642.3 rpms. The limit is 80,000. That's 15psi @ 5500rpms on the tach, after which the supercharger can give no more oomph for power.

With a 5.9" Crank Pulley it spins @ 78296.5 rpms. I'm thinking maybe just for track days to use it, and put the 5.7" back on for daily driving.

I'm just trying to squeeze a few more lbs of torque mostly by hopefully increasing boost by maybe 2-5 lbs.

I may be interested in a 5.9 if not perhaps a custom 8.5 to be safe. Also did you upgrade the plastic pulleys on the tensioner and alternator to billet types to help support over spinning?
513whp on c16; Tuned by
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Part III: Install Handicap Driving Controls
Ma Cah:

Last edited by Rudel; 05-09-2007 at 09:51 PM.
Rudel is offline  
    Reply With Quote