kb 2.6 pulleys and boost question

[encasedmetal]

Hey everybody. I just traded my procharger f1a setup for a kenne bell 2.6 etc. The former owner said he made 18 psi with a 3.75 pulley and stock sized metro lower however most of what I've read indicates less psi than 18 with a stock lower. Does this seem accurate? Being that I have 10:1 cr, huge cams and full exhaust I'm starting to think I need a much smaller pulley to achieve 17-18 psi on pump 93. Thanks for any insight.

 

[encasedmetal]

Saw that kenne bell rates the 3.75 pulley for 16 psi with stock lower so just to double check I measured the metro lower and it is a hair over 8" so I assume it's a 2lb lower. So maybe the po did make 18 psi with stock motor.

 

[MBoyle1]

I made 18psi with stock lower & 3.50 upper & 20psi with 3.25 upper,just ordered a 3" hope to get 22#

 

[Stage 4.6]

I don't have a stock lower but I am at 16.8psi with 3.75 upper and 4lb. lower stock manifolds and highflo cats with 91 octane.

 

[encasedmetal]

I don't have a stock lower but I am at 16.8psi with 3.75 upper and 4lb. lower stock manifolds and highflo cats with 91 octane.

isn't that low psi with the 4lb lower though? no idea, just asking

 

[Stage 4.6]

My tuner said the same thing, he said he was really impressed with numbers it put down, cause of the low boost I believe the 2.6Hs are designed for 15-24psi?
Ive only owned my cobra for 2-3 years so i am in the learning stage especially with the upper/lower pully combos I just had the blower put on late this summer.

 

[encasedmetal]

My tuner said the same thing, he said he was really impressed with numbers it put down, cause of the low boost I believe the 2.6Hs are designed for 15-24psi?
Ive only owned my cobra for 2-3 years so i am in the learning stage especially with the upper/lower pully combos I just had the blower put on late this summer.

maybe elevation is a factor?

 

[Stage 4.6]

maybe elevation is a factor?

Elevation is always a factor up here, You really notice it in the MPH, compare to cars with the same power levels that are at sea-level to up here and the difference can be up to 10mph. he claims I should see some significant improvements with LT headers and off road pipe and still have boost under 20psi.