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ECMlink Omni 5 bar map sensor ecmlink settings needed

deboelduro

Proven Member
159
26
Sep 5, 2007
winsted, Connecticut
Just bought a Omni 5 bar to replace my 4 bar that I’ve had for years. Wanted to run more boost :) so. What settings would I input. On ecmlink

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1990TSIAWDTALON

Moderator
9,128
4,965
Nov 14, 2013
Independence, Kansas
I have been hunting for the correct values and have finally come to the conclusion that it would be easiest to just contact them directly.

When I look at the Omni 3 bar settings they are +9.132v down to -0.020v
The Omni 4 bar settings are +11.963v down to -0.039
SOOO....if I did the math right, you can try +14.794v for the high limit and -0.058v for the low limit.
I emailed Omni with the question, we will see if I get an answer close to my math ROFL
Marty
 

1990TSIAWDTALON

Moderator
9,128
4,965
Nov 14, 2013
Independence, Kansas
So Bob, from Omni, got right back to me with these specs. I think the negative #'s are for the low setting (vacuum) and the high settings are for boost.
One thing to remember about MAP sensors is that when you get a 4 BAR sensor, it reads negative also to 1 bar at least. It is something some people overlook and think 4 BAR = good to 56psi which is wrong, only good to about 42ish. I know, I run one. I have a 5 BAR Omni sensor also since I run over 42lbs of boost on the stick car but it isn't installed yet.
Here is his attachment he sent me back.
Marty

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Michael Wucher

Proven Member
32
6
Apr 19, 2020
Norfolk, Virginia
So Bob, from Omni, got right back to me with these specs. I think the negative #'s are for the low setting (vacuum) and the high settings are for boost.
One thing to remember about MAP sensors is that when you get a 4 BAR sensor, it reads negative also to 1 bar at least. It is something some people overlook and think 4 BAR = good to 56psi which is wrong, only good to about 42ish. I know, I run one. I have a 5 BAR Omni sensor also since I run over 42lbs of boost on the stick car but it isn't installed yet.
Here is his attachment he sent me back.
Marty

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I'm struggling to set up my 5 bar omni. I cant quite seem to get it right. Help would be greatly appreciated :)
 

1990TSIAWDTALON

Moderator
9,128
4,965
Nov 14, 2013
Independence, Kansas
I did some math between 4 bar and 3 bar Omni sensors and tried to come up with some "user defined" values to try for the 5 bar.
Try 14.790 psi/volt
And -0.058 volts (offset)
You can ALWAYS change it back but give those #'s a try as user defined for the 5 bar map.
Report back please also.
 

Michael Wucher

Proven Member
32
6
Apr 19, 2020
Norfolk, Virginia
I did some math between 4 bar and 3 bar Omni sensors and tried to come up with some "user defined" values to try for the 5 bar.
Try 14.790 psi/volt
And -0.058 volts (offset)
You can ALWAYS change it back but give those #'s a try as user defined for the 5 bar map.
Report back please also.
would you mind looking me up on facebook if you have one and shoot me a message please. I cannot get this thing to read correctly so ill try and show you what im doing
 

1990TSIAWDTALON

Moderator
9,128
4,965
Nov 14, 2013
Independence, Kansas
Sorry. I absolutely would never join FB. This is about the only media you'll find me on.
 

danl

Proven Member
670
77
Apr 8, 2002
Severn, Maryland
From the Omni spec sheet for the 5 bar:

The offset is 0.6 volts, put this in volts (user defined offset). This is the lowest voltage the sensor will output at 30kpa.

The pressure range is 30 to 500 kpa, or 470 kpa. 470 kpa = 68.1677psi range. The sensor voltage goes from 0.6 to 4.75 volts, or voltage range of 4.15 volts. PSI/volt will be 68.1677psi/4.15volt= 16.43 and matches up with omni's multiplier factor. Put 16.43 volts in volts/psi (user defined scale).

You can verify this using the transfer function in the spec sheet.
 

Michael Wucher

Proven Member
32
6
Apr 19, 2020
Norfolk, Virginia
From the Omni spec sheet for the 5 bar:

The offset is 0.6 volts, put this in volts (user defined offset). This is the lowest voltage the sensor will output at 30kpa.

The pressure range is 30 to 500 kpa, or 470 kpa. 470 kpa = 68.1677psi range. The sensor voltage goes from 0.6 to 4.75 volts, or voltage range of 4.15 volts. PSI/volt will be 68.1677psi/4.15volt= 16.43 and matches up with omni's multiplier factor. Put 16.43 volts in volts/psi (user defined scale).

You can verify this using the transfer function in the spec sheet.
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Here is what I’ve used. Does that look right?

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Michael Wucher

Proven Member
32
6
Apr 19, 2020
Norfolk, Virginia
From the Omni spec sheet for the 5 bar:

The offset is 0.6 volts, put this in volts (user defined offset). This is the lowest voltage the sensor will output at 30kpa.

The pressure range is 30 to 500 kpa, or 470 kpa. 470 kpa = 68.1677psi range. The sensor voltage goes from 0.6 to 4.75 volts, or voltage range of 4.15 volts. PSI/volt will be 68.1677psi/4.15volt= 16.43 and matches up with omni's multiplier factor. Put 16.43 volts in volts/psi (user defined scale).

You can verify this using the transfer function in the spec sheet.
Just tried those settings, car has no throttle response and struggles heavily to idle
 

Michael Wucher

Proven Member
32
6
Apr 19, 2020
Norfolk, Virginia

I would expect to see linear boost as sensor type in drop down. Also I saw a post where someone’s car was broken, then they added an Omni 5 bar. Not sure if that was you, but if it is, it’s possible something else is broken and the map sensors are fine.
It was possibly me. Car has been running super super rich afrs and i thought map was culprit
 

danl

Proven Member
670
77
Apr 8, 2002
Severn, Maryland
I think you need to resolve your first issue before adding complexity with a 5 bar map.

Try to find a known good GM 3 bar map if you have data proving the map is the issue. Otherwise find and fix your original problem. The Omni sensors can be hit and miss reliability wise. The non Chinese GM are known to be more reliable and have better resolution.
 
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