10psi pulley VCS

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Sep 4, 2006 | 12:36 PM

#11

s2k_suprchrgd

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Quote:

Originally Posted by Sideways,Sep 4 2006, 08:02 AM

Basic question, what supercharger did you install?

i have the vortech unit

Sep 4, 2006 | 12:40 PM

#12

Sideways

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From: South of the pier, Huntington Beach, CA

Quote:

Originally Posted by s2k_suprchrgd,Sep 3 2006, 02:04 PM

i just installed my 10 psi pulley and it only reads 8.2 psi at 9100rpms on the AEM EMS

what you guys suggest? is there anything i need to do so it will reach 10 psi?

thanks

The problem is the 4-1/2 inch pulley is a 9 lb pulley and not a 10.

Get a smaller pulley.

Sep 4, 2006 | 12:42 PM

#13

s2k_suprchrgd

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Quote:

Originally Posted by Slows2k,Sep 3 2006, 06:00 PM

A ported head and lowered CR will cause a lower boost # than a stock CR and stock head.

Time for a smaller pulley to get more boost with your 9:1 motor.

so in order for me to run 14psi pulley i will need smaller than 3.8" pulley?

Sep 4, 2006 | 12:52 PM

#14

s2k_suprchrgd

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Quote:

Originally Posted by Sideways,Sep 4 2006, 12:40 PM

The problem is the 4-1/2 inch pulley is a 9 lb pulley and not a 10.

Get a smaller pulley.

i just checked the pulley chart list and it states 4.5"pulley = 10psi at 9000rpm

my redline is at 9500 so the extra rpms should make more boost?

Sep 4, 2006 | 01:51 PM

#15

Sideways

Joined: Oct 2000

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From: South of the pier, Huntington Beach, CA

I made the chart and pulled the numbers out of the air.

What ever you have is what you get. Order up several and have fun. The 4.25 inch would be fun. The 4 inch would be even more fun,

I've been seeing high 13s to low 14s with the 4 inch at 9200 rpm.

Sep 4, 2006 | 02:05 PM

#16

Slows2k

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From: Mother F'in TN

Quote:

Originally Posted by s2k_suprchrgd,Sep 4 2006, 03:52 PM

i just checked the pulley chart list and it states 4.5"pulley = 10psi at 9000rpm

my redline is at 9500 so the extra rpms should make more boost?

The issue is you can't compare pulley diameter with Psi produced. You car now makes approx 1.8 psi less than a stock motor. So find a pulley diameter that makes about 1.8psi more than what you want on a stocker.

On a 9:1 motor I'd be wanting a 4" pulley or smaller.