radix , 3.0 pulley, afi performance tune, air raid intake , magnaflow catback on a 2006 vortec max silverado. wont let me upload the chart ( to big ) but i put down 429 hp and 470 torque. this was on a dynojet at 70 degrees.

 

Verry nice numbers.

 

What psi does the 3.0 pulley make? I don't own a supercharger and don't know either what they make on certain pulleys.

 

Depends on intake/exhaust setup but a Maggy on a 5.3L/3" pulley should be around 9-10lbs. Slightly less for a 6L

 

Is that a ho 6.0?

 

it is the h.o. 6.0 ( lq9 )
it makes 7.5 psi.

 

does 8.5 sound low for a 2.8 pulley on a 5.3?

 

im not super familiar with them but yes it does seem a little low. do you have headers or a cam? that will lower it sometimes.

 

yes, and 3" exhaust.

 

well with the headers you will lose some boost as boost is really a measure of pressure caused by restriction. hence less restriction=less boost. depending on your cam you may be losing some boost. whats the overlap?