Just wondering what the average boost is for a 1st gen with a 16cm housing when cruising @ 65mph on flat highway. I get about 3-4psi driving with as little pedal as needed to maintain 65. Just wondered if this was normal. thanx

 

Mine is about that also unless I start going up a hill, then it might climb to 8 - 10 or so.

 

Those numbers are what mine are.

 

I don't have overdrive, but everything I read indicates an average of 10mph differance in my readings compared to trucks equipped with o.d.. I am in that same area on boost at 55mph. Your boost will be up when the engine is working, but will drop to nothing when slowing or going down hill.

 

Here on the flat lands, I set the cruise at 110kph and I am running between 2 and 3 psi of boost. Once she is rolling it takes very little effort to keep her there.
18cm housing.
No Tach.
In overdrive.

 

at 65 i might make 2psi on level ground, at 75 I'll make 4-5psi (with 3.55's) empty. very rarely empty do I see double digit boost, unless i get into it. Goose it in 3rd and it'll go to 15psi empty pretty quick tho