Boost pressure is only a measure of pressure inside the intake manifold, not an indication of airflow. How much airflow are you seeing? That matters more than intake pressure. It is common for cammed engines to make more power at lower intake pressure because they have better flow due to less backpressure.

 

what does the gauge read with the key off if it’s mechanical? That’s a lot of vac for that cam, that’s on par with a stock cam. Any idea what the MAP sensor reads at idle?

i would expect that cam to idle in the 16-17” range at 650rpm off the top of my head.

 

I am currently running a LSX375B15 with a 2.9 Whipple. I have a 4.0 blower pulley with a 10% OD crank pulley and make 13psi of boost. The LSX has the stock LS7 cam so it is a bit smaller than your cam also...

 

[QUOTE=03sierraslt;5480040]what does the gauge read with the key off if it’s mechanical? That’s a lot of vac for that cam, that’s on par with a stock cam. Any idea what the MAP sensor reads at idle?

i would expect that cam to idle in the 16-17” range at 650rpm off the top of my head.[/QUOTE

i agree. Thats a lot of vacuum for that cam

 

I dont know what the hell I was thinking. I was going off memory of the vacuum on the cam at idel. It idles at 750 and pulls 11-12 on the gauge