Recording manifold pressure beyond 60 inches

[biggins]

Hello,

I've replaced the standard manifold pressure sensor with one of the same form factor but has a range up to 90 inches. I edited the sensor file with the appropriate slope and intercept and accurate manifold pressures beyond 60 inches are displayed. So far so good.

The issue is that when the data is recorded any values over 60 inches are recorded as 60 inches.

We side stepped this before by using a second sensor input off the 90 inch manifold pressure sensor but we really need that sensor input for other critical instrumentation.

It appears that pin 26 of the db-37 is hard coded for just MAP and just up to 60 inches when it comes to recording.

Sounds like a software fix is required, any other ideas?

 

[PeterMac]

Hi biggins,
I'm a newby here, but I've been playing quite a bit lately in the EMS sensor config files of my Skyview. Have you sorted your problem yet? If not, did you try changing the "max_value" setting of the appropriate MAP sensor file? There are about ten MAP sensor files available, and all have their max_value set at 29.5psi (60inhg). You need to find the file you have assigned to pin 26, and then for that sensor configuration you need to change the max_value from 29.5 (60inhg) to 44.2 (90inhg).
Does that make sense?

 

[biggins]

Yeah, I've done that, that allows the display of MAP above 90 inches, but when it records the data for download (and say upload to Savvy for analysis) any manifold pressures above 60 are recorded as 60. Here is the sensor reconfigured for the 90 inch sensor where the slope and intercept are adjusted to get accurate measurements:

sensor={
id=100434-000
;VERIFIED POLY, FILTER?
function=PRESSURE
pins=C37_P26
; THIS NAME IS FOR A SPECIAL CASE FUNCTION WHICH WILL NOT APPEND "PRESSURE" TO THE END OF THE SENSOR NAME
name=MAP
;The below are in PSI, not inHG, like all pressure senders
min_val=1.25
max_val=44.2
resolution=1
round=.1
is_piecewise=0
low_coeff={
c_x4=0
c_x3=0
c_x2=0
c_x1=8.9529;6.7196
c_x0=0.1603;4.2086
}
low_resistance=NONE
low2high_cross=0
high_coeff={
c_x4=0
c_x3=0
c_x2=0
c_x1=0
c_x0=0
}
high_resistance=NONE
high2low_cross=0
window=.2
shift=3
age=16
}

 

[PeterMac]

Ah, now I understand your problem. Yeah, I suspect that the required edit may need to be done by Dynon. Will look forward to seeing how this one plays out. Good luck.