rattlerbob5.9

Anybody know what the max and normal boost pressures should be on a 96 p-pumped 300 hp tuned 8.3 hx-40 turbo all stock right now in a rear pusher motor home. Turbo is free and no end play also good working waste gate (maybe too good ? ) seemed to take a fair amount of air pressure to trip it but i did not have a gauge on it.
The unit is a 36' fore travel and weighs around 25-29k .

I checked it and found max at 14psi, around 7 @1600 rpm on flat ground under normal load and 9-10 when working it a little.

Seems to run good but likes to smoke some black a little more that i would like to see under light to medium load rolling down the road.
Full load from a take off is good just a light haze.

90k on the unit and fuel mileage is is good rolls down the road nice but if it were mine i would want a little more power out of it.

Thoughts and ideas ??????

chaikwa

Yeah, don't buy it!

rattlerbob5.9

How can you say that you don't know the price

It's not for sale just one i do work on for the owner.

dieselfreak21

No exper but seems a little low. Any boost leaks? 14 years on them boots if never replaced.

Hvytrkmech

Look for boost leaks. Normal boost under full load is right around 25- 28 psi. Also check for air flow restrictions, like air filter, mouse nests in the air pick up area, etc.

rattlerbob5.9

I thought it was low myself and i did not see any leaks but i thought i would find out first what the proper amount of boost should be on it.

The air cleaner was just changed.

Thanks for the input.