Raptord

iTrader: (10)

UPDATE: For anyone else who may be looking for scalings for the OMNI 3-bar, here are the settings that ended up working:



And here is the correct Evoscan equation: 0.17886 * x + 0.161 - y
where y = your local atmospheric pressure (14.7 at sea level)



Original Post:

Hi all,

I recently realized that I have an OMNI 3-bar MAP sensor, not a JDM MAP sensor, so I need to adjust my MAP scalings. I've searched but didn't find anything, except that the OMNI's scalings were apparently within 1-2% of the GM 3-bar, but I can't find scalings for that one either.

Anyone have MAP Scaling values for the OMNI 3-bar MAP sensor? just to be clear I'm talking about this table:

killerpenguin21

iTrader: (20)

the omni is a 4 bar as far as i know. here are the instructions, i just did it the other day.

https://www.evolutionm.net/forums/ec...evo-8-9-a.html

Raptord

iTrader: (10)

Yes there is a 4-bar, but this is a 3-bar that I have.

http://www.omnipowerusa.com/product.asp?P_ID=157

3, 4 and 7-bar sensors are made by OMNI for the Evo.

Thanks anyway though.

killerpenguin21

iTrader: (20)

ah sorry. i was just going by how most places only sell the 4 bar. my bad!

RoadSpike

iTrader: (5)

Assuming you keep the right hand side the same as a 4 bar

Volts:

0.68
1.2
1.72
2.24
2.76
3.28
3.8
4.32
4.84

Values:

25
49
70
96
120
144
170
195
255

Raptord

iTrader: (10)

Assuming that the little test I did makes sense, those aren't correct.

What I did was take a known psig value (23) and plug it into the old evoscan formula I was using to get the raw output, which gave me 198.88. I then checked my MAP scalings (which are for a JDMMAP) to see what voltage outputs that number (4.093V). I then used that voltage along with your proposed scalings and got a new raw output of 185.18. When I used that in the correct 3-bar OMNI MAP sensor evoscan formula I got 18.75 psig.

I have Zeitronix's MAP sensor plugged into my ZT-2 w/ the LCD, and when I'm boosting 23 psig (according to my now-false JDMMAP formula) I would get around 22, not 18.75 psig on the ZT-2.

Is my math/logic correct?

RoadSpike

iTrader: (5)

If thats the case that means the 4 bar settings aren't correct. All I did was take 4/3rds of the volts value to come up with the new settings.

Funny enough since its a 5volt 3 bar sensor I suppose you could have used the JDM settings for it. Though just glancing at the two they look similar in scale as the ones I posted up to the 140 mark.

JDM Settings:
0.51 20
0.90 40
1.29 57
1.68 78
2.07 97
2.46 117
2.85 138
3.24 158
3.63 255

If we just wanted to math this out the original MDP sensor of 1 BAR 4.53 volts was equal to 80 units. Since a 3 bar sensor rises exactly 3x faster than a 1 bar sensor the equivalent voltage at 80 would have been 4.53/3.

Direct value conversion from stock would look like this.

Stock:
0.84 11
1.37 20
1.89 31
2.42 40
2.95 48
3.48 57
4.00 67
4.53 80
4.98 255

Modified:
0.28 11
0.42 20
0.63 31
0.81 40
0.98 48
1.16 57
1.33 67
1.51 80
1.66 255

vd

iTrader: (3)

Nevermind.

Raptord

iTrader: (10)

Roadspike, I get what you're saying now. I'll try the first scalings you suggested. If they don't work I'll try VD's.

I'll report back tomorrow with which ones I end up using.

Thanks to both of you.

Raptord

iTrader: (10)

Briefly tried out the new scaling, looks pretty good so far but I had to let off early on my test pull because of overboost, I'll try another pull tonight after adjusting the WGDC table.

Raptord

iTrader: (10)

Looks like Roadspike's scaling's have done the trick. I'll update my OP with all relevent information for the OMNI 3-bar since it's not easy to find in other threads, should anyone else need them in the future

Thanks again Roadspike.

DNBishop

iTrader: (3)

Did a lot of searching, found this and it helped me out. I noticed my boost gauge and what the logs were showing was off by a few psi and I started looking............

Wonder how many more of the OMNI 3 bar's are out there running on JDM data?

Raptord

iTrader: (10)

Dunno, but I suspect it's more than the number of people who are using OMNI 3-bar scalings judging by how little info there is about them on the forum.

DNBishop

iTrader: (3)

Well let me back up...... It helped me out in knowing I don't have a JDM or OMNI MAP. After some digging the company I purchased from told me it's there brand (Honda's guys use them).

They sent me the voltage vs PSI/boost chart. How do I convert that over to our requirements?

thanks

Raptord

iTrader: (10)

Don't know how to do that, sorry! Surely someone on the forum will know.