boost pressure

Can anyone tell me what the boost pressure on a 1972 7GB track loader with an Allison 6-cylinder turbo charged engine should be?

DrAllis wrote: It's not an ALLISON engine. It's an Allis-Chalmers engine. I assume it is a 3500 series engine ?? There's a metal tag on the left side of the engine block.  I would expect a max turbocharger/intake manifold boost of 10 or 11 psi at full throttle under a good load.

Or you have a bad air leak somewhere in your piping or a blown intake manifold gasket.

I can envision a Common thought here, Turbo changes to gain boost pressures, is not how it works.  Fuel Delivery, Cylinder number and displacement, Max RPM to HP in a torque curve and finally the style of Turbine Blading in the Turbochargers.  90% of ALL turbos were constructed as Altitude Compensation Devices.  IOW, there only to take thinning air at higher altitudes and increase the volume so engine could utilize all the fuel delivery rate for Lower Altitude Denser air.  Many were on the older earlier engines to reduce Smoking by forced add of air to combustion as Smoke is nothing but Unburned Underutilized Fuel. Addition of a Charge Air Cooler to make that pressurized air even more dense was another development.