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'09 CTS-V
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215 Posts
Discussion Starter · #1 ·
I'm kinda new to the supercharger world.. this is the first car I ever own with one. All I know is you have to change your pulleys in order to increase your boost.
What I'm trying to do is simply increasing the boost to the equivalent of 1 bar, or 100 kilopascals (kPa). But from what I understand, the stock level is at 9.5psi, (based on wait4me mods) adding a snout pulley would give me +3psi so I would hit 12.5psi. If I ditch the snout pulley and get me a crank pulley at 5% it would be 12.5psi and if i got the 10% it would be 15.5psi. Am I missing something here? I don't understand the story about the boost rings.. would those slightly raise or decrease? How can I hit the 14.5-14.7 range?

Thanks in Advance.
 

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'06 Z06, '05 CTS-V 453rwhp/434rwtq (sold)
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4,452 Posts
Why do you want to hit 14.5 psi?
 

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'09 CTS-V
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215 Posts
Discussion Starter · #3 ·
Because 1 bar = 14.5037738 pounds per square inch
I find 1 bar to be a magical number, just like 200mph is a magical number etc. If you're going to mod it's more fun when you have goals.
 

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2009 CTS-V
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26 Posts
Taking a supercharger designed to run a 1.6:1 pressure ratio, and asking it to go 2.0:1 might be problematic.

Best way is to put a supercharger with more displacement per rev.

03-04 Cobra guys found this out the hard way in many cases.
 

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11v,2 09 v's,2 05 v's,5 GTM supercars,viper,volt,2012 karma
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2,997 Posts
16 psi is the fuel limit. It cant produce enough fuel via the FPDM driver anymore.

As for referencing the 03 cobra, M112 eaton rotor pack. that does not compare to the Eaton TVS1900. The 1900 is fine for what we are doing with the car.....

Here is for reference.

8.5 inch lower crank pulley will net about 2 psi.
9 will be in the 12-13 range depending on weather.
9.5 will get you about 14-15 psi.
10 will get you WAY OVER FUEL CAPACITY of about 17psi.

I dont feel safe using 17 psi on pump gas, Even with the fuel system fixed.

What you need to do at that point is, better rods, pistons, Cam, Heads without the swirl port, and then less boost to hit the same power.
 

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cts v 2009
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160 Posts
16 psi is the fuel limit. It cant produce enough fuel via the FPDM driver anymore.

As for referencing the 03 cobra, M112 eaton rotor pack. that does not compare to the Eaton TVS1900. The 1900 is fine for what we are doing with the car.....

Here is for reference.

8.5 inch lower crank pulley will net about 2 psi.
9 will be in the 12-13 range depending on weather.
9.5 will get you about 14-15 psi.
10 will get you WAY OVER FUEL CAPACITY of about 17psi.

I dont feel safe using 17 psi on pump gas, Even with the fuel system fixed.

What you need to do at that point is, better rods, pistons, Cam, Heads without the swirl port, and then less boost to hit the same power.
jess you mean 10% overdrive crank pulley will give you fuel issues??...guys you can clear my doubt too.. 10% lower crank pulley is fine or....???
 

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11v,2 09 v's,2 05 v's,5 GTM supercars,viper,volt,2012 karma
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10% is equive to a 9. in that list
 
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