Manifold absolute pressure

[Bouncerbeater]

Can anyone confirm the formula for working out boost pressure from map figures in kpa ?
Been looking through some logs and it seems my boost is spiking to 31psi ish according to my calculations which seems very high but then I may be working it out incorrectly. Any ideas ?

 

[Bouncerbeater]

Some basic logs below where the map reading is even higher. Excuse clumsiness as I was doing it on iPad.

Sent from my iPad using Tapatalk

 

[Hobbiniho]

are you remembering to take off atmospheric pressure which is 1.013barg?? as most/all boost gauges show gauge pressure i.e pressure above atmospheric so 1 bar on your boost gauge is actually 2.013bar absolute

edited to add 1bar=13.5psi

 

[Bouncerbeater]

Atmospheric pressure approx 100 kpa ? Is that roughly correct ?


Sent from my iPad using Tapatalk

 

[Hobbiniho]

yeh atmospheric pressure is 101.3kpa roughly

 

[ibizacupra]

1bar is 14.5psi not 13 btw
100kpa - 1bar - 14.5psi ~(gauge)

 

[ibizacupra]

Some basic logs below where the map reading is even higher. Excuse clumsiness as I was doing it on iPad.

Sent from my iPad using Tapatalk

300kpa at 6krpm and 212gs airflow?
those figures dont make sense

what engine/turbo is this?

 

[vroomtshh]

1bar is 14.5psi not 13 btw
100kps - 1bar - 14.5psi ~(gauge)

14.7psi

 

[nd-photo.nl]

http://www.centauro-owners.com/articles/psibar.html

http://www.convertunits.com/from/bar/to/psi

http://www.endmemo.com/sconvert/barpsi.php

http://www.asknumbers.com/bars-to-psi.aspx

http://www.tvr-webmart.co.uk/tvr_info_psi.asp

All say 14.5 when inputting 1 BAR

 

[Bouncerbeater]

300kpa at 6krpm and 212gs airflow?
those figures dont make sense

what engine/turbo is this?

This is why I was concerned, it's amk
At yours in the morning for a smoke test Bill.
These kpa readings are calculated if I rember correctly, maybe not accurately ?

 

[ibizacupra]

14.7psi

1bar - 14.5psi (gauge)

14.7 is a Stoich - lambda - 1.00

 

[ibizacupra]

This is why I was concerned, it's amk
At yours in the morning for a smoke test Bill.
These kpa readings are calculated if I rember correctly, maybe not accurately ?

they cant be real.. Factorys map sensor can only read 2550mb measured. (255kpa) aka 1.5bar boost etc etc

some calc gone awry me thinks

what software logging was this done on?

 

[xDaNx]

1 bar = 14.5037738 pounds per square inch

 

[Bouncerbeater]

they cant be real.. Factorys map sensor can only read 2550mb measured. (255kpa) aka 1.5bar boost etc etc

some calc gone awry me thinks

what software logging was this done on?

Is an obd app on iPhone/iPad
My lead has turned up today for vagcom so will hopefully get some better logs to view