P1SC pulley size ?
Thread Starter
Melting Slicks
Joined: Aug 2004
Posts: 2,237
Likes: 9
From: Springhill FL
P1SC pulley size ?
Well guys, as some of you know, I've had a hard time getting a head unit. After two seperate deals fell through on head units, I finally have a P1SC sitting on my workbench.
I ended up buying a used mustang GT kit just for the head unit
I paid $1900 for the kit, by the time I sell the Bracket, intercooler, injectors, MAF and BOV I"ll come out with a pretty good deal on the head unit 
Anyway here is my dilema. When I thought I had a D1sc on the way I ordered a 4.5 pulley, and the head unit came with a 3.1 (
) on it. I"m looking for about 8# of boost out of it and I think the 4.5 is going to be too big, especially with my mods 
What size pulley should I get for my goals ?
Noteworthy Mods:
cam 221/221 575/575 112
LT headers
Borla stingers and high flow cats
Going to have 3" intercooler piping and a huge 32x12x3 FMIC
Thanks in advance for any advice.
I ended up buying a used mustang GT kit just for the head unit
I paid $1900 for the kit, by the time I sell the Bracket, intercooler, injectors, MAF and BOV I"ll come out with a pretty good deal on the head unit Anyway here is my dilema. When I thought I had a D1sc on the way I ordered a 4.5 pulley, and the head unit came with a 3.1 (
) on it. I"m looking for about 8# of boost out of it and I think the 4.5 is going to be too big, especially with my mods What size pulley should I get for my goals ?Noteworthy Mods:
cam 221/221 575/575 112
LT headers
Borla stingers and high flow cats
Going to have 3" intercooler piping and a huge 32x12x3 FMIC
Thanks in advance for any advice.
Melting Slicks
Joined: Dec 2002
Posts: 2,480
Likes: 62
From: Middletown DE
I am sure others will chime in, but I think the head unit you purchased is not the correct rotation? (i believe it has to be reversed)
I think you are looking for a 4.1" pulley, i have a 3.85 on mine and it will hit 9-10#'s at 6000 in the winter, about 7-8 in the summer. But you may want to take it up to 6500.
I think you are looking for a 4.1" pulley, i have a 3.85 on mine and it will hit 9-10#'s at 6000 in the winter, about 7-8 in the summer. But you may want to take it up to 6500.
Thread Starter
Melting Slicks
Joined: Aug 2004
Posts: 2,237
Likes: 9
From: Springhill FL
Originally Posted by SmoothFRC
I am sure others will chime in, but I think the head unit you purchased is not the correct rotation? (i believe it has to be reversed)
I think you are looking for a 4.1" pulley, i have a 3.85 on mine and it will hit 9-10#'s at 6000 in the winter, about 7-8 in the summer. But you may want to take it up to 6500.
I think you are looking for a 4.1" pulley, i have a 3.85 on mine and it will hit 9-10#'s at 6000 in the winter, about 7-8 in the summer. But you may want to take it up to 6500.
Here in florida its summer 10 months of the year, so maybe a 3.85 is what I'm after
Last edited by MawneeC5; May 9, 2006 at 05:06 PM.
Melting Slicks
Joined: May 2003
Posts: 2,100
Likes: 52
From: Massapequa Park, NY [This is Not an EXIT]
You may want to check further because When i was looking for my head unit I almost bought a Mustang version because it is reverse rotation. Forum members instructed me that there are differences between the Corvette and Mustang reverse rotation, if i remeber it had sometime to do with the position of the internal gearing. I never found 100% soild proof either way,because i ended up with a Vette Head unit anyway, but you may want to look into it.
Thread Starter
Melting Slicks
Joined: Aug 2004
Posts: 2,237
Likes: 9
From: Springhill FL
Originally Posted by Villain C5
You may want to check further because When i was looking for my head unit I almost bought a Mustang version because it is reverse rotation. Forum members instructed me that there are differences between the Corvette and Mustang reverse rotation, if i remeber it had sometime to do with the position of the internal gearing. I never found 100% soild proof either way,because i ended up with a Vette Head unit anyway, but you may want to look into it.
BTW he also recommended a 4.0 pulley for 8# of boost for my car after he had me explain my mods. Very helpful
Melting Slicks
Joined: May 2003
Posts: 2,100
Likes: 52
From: Massapequa Park, NY [This is Not an EXIT]
Originally Posted by MawneeC5
Just got off the phone with ATI. There are no differences in the drive ratio, or gear position between kits. The different ratios are different head units i.e. P1sc, D1sc, F1 ect. He assured me that as long as its the correct rotation, all I have to do is clock it and put on my pulley
BTW he also recommended a 4.0 pulley for 8# of boost for my car after he had me explain my mods. Very helpful
BTW he also recommended a 4.0 pulley for 8# of boost for my car after he had me explain my mods. Very helpful
Glad it worked out for you
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Safety Car
Joined: May 2002
Posts: 3,615
Likes: 2
From: waterloo ontario
St. Jude Donor '08
On a P1SC a 4.10 pulley is what Andy supplies for a regular Vette-for a Z06 they come with a 4.25-because of the added compression. I would say 4.10 is what you want. If it's a reverse rotation from a Stang, like from a mod motor you should be good.
Safety Car
Joined: Apr 2005
Posts: 4,769
Likes: 0
From: SFV CA
Originally Posted by vertC6
A 5" pulley is what I am going to go with, it will put out between 6.5 and 7 psi at its peak on a D-1. A 4.75" 7.5 - 8psi, a 4.5" 8.5 - 9 psi, a 4.38" is 10psi.
Life Time NCM #2196
Joined: Sep 2004
Posts: 82,605
Likes: 1,722
From: Converse TX
Originally Posted by dwalker011
What is the next size/sizes down from a 3.85 pulley on a P1 and what boost will they produce? I have a 3.85 and am looking for more boost. If anyone has one PM me. Thanks.
