Pully combo help needed

[nos]

I have an MPI mountain kit supercharger installed on my Nytro with 28/28 pulleys. I was told this will produce about 6-7 psi in low elevation. If I wanted to get another 2-3 psi out of this supercharger what pulley combination can I put on here? Would changing the top to a 27 get the job done?

 

[nytrozula]

I would like to know myself. I'll be putting a head shim on my engine soon and want to increase boost when I do. for those running close to 10 psi, what combination are you using?

 

[hyprst]

I have an MPI mountain kit supercharger installed on my Nytro with 28/28 pulleys. I was told this will produce about 6-7 psi in low elevation. If I wanted to get another 2-3 psi out of this supercharger what pulley combination can I put on here? Would changing the top to a 27 get the job done?

Are you running an inner cooler? If you are you will probably be 5-6 psi with the 28/28. I have a stage1 running 29/25 combo 9-10 psi at 9000rpm.

 

[Sledguy89]

I jus took off my 31/24 set off an put on 28/26.i am intercooled with cold air kit,anyone know Have an idea on what this should produce psi wise at sea level

 

[scuba_nytro]

Stage 1 28T/27B about 800 feet above sea level seeing about 7PSI around 8900-9000rpm. Was told 25T/29B is 9-10PSI by the guy I bought my kit from. Fuel pump upgrade may be required for anything about 7PSI near sea level. I would expect somewhere around 5-6PSI with the 28T/26B set up. Please let us know thanks.