4" diameter ATI pulley ?

Reply Subscribe

Thread Tools

Search this Thread

Jan 20, 2003 | 04:41 PM

BIGBOS

Thread Starter

TECH Senior Member

Joined: Nov 2001

Posts: 11,603

Likes: 0

From: Chi-Town, IL

4" diameter ATI pulley ?

I went over to see how my car was coming along today...saw the 4.00 pully on the supercharger, this is the 8psi pully correct?

I was told I will only see about 5 psi from it though, whats the next size down from there, and what is that one rated at, boost wise...

Thanks,
Bos

[ April 18, 2003, 04:18 PM: Message edited by: Pro Stock John ]

Jan 20, 2003 | 05:32 PM

Black LS1 T/A

Moderator

Joined: Nov 2001

Posts: 3,048

Likes: 12

From: Raleigh, NC

Re: 4" diameter ATI pulley ?

I saw about 5 PSI with the 4.10" pulley.

Jan 20, 2003 | 05:33 PM

BIGBOS

Thread Starter

TECH Senior Member

Joined: Nov 2001

Posts: 11,603

Likes: 0

From: Chi-Town, IL

Re: 4" diameter ATI pulley ?

Yea, thats what I told I would see, whats the next size down from there?

Jan 20, 2003 | 07:48 PM

BIGBOS

Thread Starter

TECH Senior Member

Joined: Nov 2001

Posts: 11,603

Likes: 0

From: Chi-Town, IL

Re: 4" diameter ATI pulley ?

TTT...

I ordered the 8psi tuner kit through Speed Inc. I'm wondering if they sent the wrong pully, are you supposed to get the 4.10 pully with the 8psi kit?

I thought the 8psi pully was like 3.xx??

Jan 21, 2003 | 01:28 AM

AzzHauler

TECH Resident

iTrader: (3)

Joined: Nov 2001

Posts: 979

Likes: 0

From: Richmond, VA Where fast cars, well......are hard to come by.

Re: 4" diameter ATI pulley ?

I didn't get a chance to call ati yesterday about my pulley, but I will be when I get off work this morning and finish class.

Jan 21, 2003 | 06:03 AM

Black LS1 T/A

Moderator

Joined: Nov 2001

Posts: 3,048

Likes: 12

From: Raleigh, NC

Re: 4" diameter ATI pulley ?

<blockquote>quote:<hr />Originally posted by BIGBOS:
 Yea, thats what I told I would see, whats the next size down from there? <hr /></blockquote>I was told they have 4.10", 3.80", 3.60" 3.40" and 3.20".

I've seen the 4.10" and 3.20".

I went to the 3.20" because I thought I had a 3.60", since I supposedly had a 7 or 8 PSI Tuner kit. When I took the pulley off, 4.10 was stamped on the pulley. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> I don't know WHY they put the stamp on the unseen side of the pulley.

Anyway, I decided to try it and BAM!, I was at 12 PSI! A near instantaneous 8 PSI (I had a SY3500). There was MUCH detonation.

I hurriedly bought some MAC headers to bring down the boost (now at 9.5 to 10 PSI). I STILL had to supplement my 93 octane with some TORCO Race Fuel Additive or mix some 100 octane in, if I wanted to race pass after pass. It was fine for driving everyday if I only did a streetlight to streetlight race or a quick run thru 1st and maybe halfway thru 2nd. But, if I ran it past 100 MPH, I got detonation in the higher RPMs unless I did the TORCO thing or mixed in the 100 Octane.

In retrospect, I believe the 3.60" pulley would have been ideal without headers and the 3.40" with headers (shooting for around 7 or 8 PSI of boost). I believe 7 or 8 PSI is the max any of us with a stock internals motor should run. That's MY personal opinion.