4 inch Pulley on D1-SC? How much Boost?
Thread Starter
Joined: Aug 2002
Posts: 10,331
Likes: 1
From: San Antonio, TX
4 inch Pulley on D1-SC? How much Boost? I recieved my kit Yesterday from ATI and it says that it came with a 4 inch pulley. How much boost is that on a stock motor? How much boost is that on my car. LT's, full exhaust, no cats, small cam 212/218 .522/.529? Thanks 
Moderator
Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Re: 4 inch Pulley on D1-SC? How much Boost? Stock with my D-1SC I made 5PSI at 6000, 7 PSI at 6600. You may see only 2 1/2 to 3 1/2 PSI at 6000 with your mods. But, this varies so much with elevation above SL, mods, how much you tighten the belt... 
IMO, with your mods, you should have about a 3.60 pulley with upgraded fuel system and programming.
Let us know what it ends up doing for you.
IMO, with your mods, you should have about a 3.60 pulley with upgraded fuel system and programming.
Let us know what it ends up doing for you.
Moderator
Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Re: 4 inch Pulley on D1-SC? How much Boost? If you can mirror or something where you can spy the face of the pulley facing hte compressor, the size you have is stamped on the pulley.
Also, you can measure the diameter at the tip of the rib-grooves (not the outside circumference).
Also, you can measure the diameter at the tip of the rib-grooves (not the outside circumference).
Thread Starter
Joined: Aug 2002
Posts: 10,331
Likes: 1
From: San Antonio, TX
Re: 4 inch Pulley on D1-SC? How much Boost? Thanks Black LS1 T/A. I will mirror the pulley when i get home today. I was hoping to see about 5psi with my mods and then replace my 10 bolt and then work on forged pistons and rods. If i only see 2 1/2 to 3 1/2 psi what should i be seeing rear wheel? 450ish?? Thanks again
