Compressor Maps...Am I Reading This Right?

[jbeaton9292]

Hey sorry i started a new thread i wanna know if im reading this map right for a big 16g with a standard 2.0 at 22psi with 8000rpm and 90 volmetric efficancy

Here is how i came up with what i got

14.7+22=36.7/14.7=2.49 PR (pressure rating)
And
2.0x8000x90x2.49=3585600/5660=233 CFM

If what im reading is correct which i feel i am i should see FULL? Boost by 2800rpm but i will be way beyond efficiant reving that high and to rev that high and be within my lb/min of the 16g (38.5lb/min) i should be runing 17psi which is only 3psi over stock

Can someone please help me on this by explaining a little more i think im on the right path feel free to tell me if im wrong im learning here thanks all help is appreciated pic below is the map i used

 

[Soccerguy136]

This should help.

Disregard the fact that it's in a honda forum though .

Compressor map reading for dummies. - HondaSwap Forums

 

[Seamus]

I don't understand how to read or plot a compressor map so I couldn't answer a lot of questions. But if I'm understanding your post you are concerned that your running the 16g off the island by turning 8000 rpm and running more than 17psi? If thAts the case, I wouldn't fret too much. People have been running these small mhi turbos out of their efficient range and beyond their published flow For ever. Some guys have done pretty amazing stuff with the 16g. They' pushed it a lot further than the engineers at Mhi probably envisioned when designing it. Look where a couple guys have taken 14b's. I think they are welding the waste gates shut.

 

[boost97gst]

This is interesting: So what is the downside of going past the map, if you will? Is it the ratio of drive pressure to boost pressure causing inefficiency? I.e. Too much drive pressure obviously becomes resistance and that slows the inducer causing less boost or too much load for said amount of boost? I would also think that the actual shaft in the turbo sees way too much torsional stress when the drive pressure/boost pressure ratio isnt right.

Shit, maybe i should read the link.

 

[jbeaton9292]

Yeah I'm not to worried about the 16g as I have a hx35 now but was an easy map to look at is all I have figured it all out now though thanks