What does the line at the bottom of the map represent ?

If for arguments sake I wanted to run around 50lbs of air per minute but with a low boost of say 1.5PR on most maps I can find it falls off the bottom



Would the turbo still work OK?

 

The bottom line ( ie x axis ) is airflow, looks like kg/s

But what you want, and what air your engine will consume arent always the same thing.

Just because the chart doesnt show any lower doesnt mean you cant use it though.
Oddly the compressor map from Vortech for my blower doesnt show anything higher than about 40,000rpm

Weird because nobody would ever turn it that slow, some even spin it at 80k !

 

1.5pr is only 0.5bar boost isn't it? 50lbs air is somewhere near 500bhp isn't it?

You'll need a very big turbo to run that.

You need to work out what air your engine consumes at rpm and boost levels plot that on the compressor map and go from there.

 

It's a 5.4 litre 2 valve pushrod V8 with a max of 6000 revs.

Roughly 7.5 psi is all I would be able to run with a stock block casting as they have a habit of spliting down the middle over 500bhp

Just curious as why the bottom of the map is cut off

Not that I'm likely to turbocharge it anytime soon

 

I guess they probably dont show it because so few people would actually be down there. They show the area of the map that would generally be used.

The compressor map for mine shows very little over 40krpm, yet the unit is rated to 65krpm, and some spin it as high as 80krpm !

 

Looks like I need a vortech looking at your map!

 

I'm sure there is a kit available ! They arent the cheapest thing in the world though, but they do work very well, and instant power everywhere.