Vacuum/PSI readings... Baro Calibration? | AEM
3 posts / 0 new
Last post
sen2two
Offline
Last seen: 2 years 4 months ago
Joined: 06/26/2015 - 13:47
Vacuum/PSI readings... Baro Calibration?

When in 20-22hg vacuum, according to my boost gauge, the AEM is reading around -9, -10 vacuum. I have read this is because the boost gauge is reading in mercury for vacuum and PSI for boost. But the breakpoints for load in AEM Pro are for PSI for pressure as well as vacuum...

Is this the reason even when I am at full vacuumm (22HG), the AEM never reads lower than -10?

I have my most negative breakpoint at -13.5. Should I move this closer to -10 for a more accurate reading? Or do I need to calibrate my Baro settings?

AEM_BB
AEM_BB's picture
Offline
Last seen: 1 year 4 months ago
Joined: 06/04/2014 - 11:53
Yes. 22inHg is equal to 10.8

Yes. 22inHg is equal to 10.8 PSI, so your boost gauge and ECU seem to be aggreeing, just displaying in different units. When using PSIg as a display unit for Engine Load, AEMPro assumes you're at sea-level, meaning that 14.5PSIa is atmospheric pressure.

sen2two
Offline
Last seen: 2 years 4 months ago
Joined: 06/26/2015 - 13:47
Thanks. I live in Orlando

Thanks. I live in Orlando Florida and I'm probably closer to actual sea-level than most.

 

So, is setting my most negative breakpoint to -13.5 psi a waste of time? If I set my most negative breakpoint to -11psi, I could work in more resolution in my idle and cruise area. But I'm unsure if this is a good idea.