I know this tread is old but I just wanted to say thanks!

 

I know this tread is old but i cant find that map scaling map in my TephraMod V7 rom

do i have to add it ?? i just ordered omni 3bar map sensor and i dont know what to do next
pls help guys

thnks a lot

 

You may have to add the table defs to your xml. You should be able to find them here:

https://www.evolutionm.net/forums/ec...tructions.html

 

so there is no table in tephramod 7 ??

 

Yes it's there. You just need to add the definitions for the tables to your tephra xml.

 

I though my gauge or Evoscan was jacked up till I read this. I'm reviving this...great post, man!

 

i just referred to this oldy a week ago also.

 

Glad to see it's still useful!

 

Guys why I can't use stock 3 bar for sd conversation? Thanks

 

The stock MAP sensor is 1bar, not 3bar. Being 1bar means it doesn't have the range of operation that's needed to measure the amount of boost our cars run.

 

Thank you Raptord.

 

Two questions:
1)
Why is this scaling not quite linear? How come it isn't:
24 (vs. 25)
48 (vs. 49)
72 (vs. 70)
96
120
144
168 (vs. 170)
192 (vs. 195)

2)
For EvoScan logging, I am adding a new item with that formula. I noticed there is already an Omni 4Bar item in my Tephra v7 XML, and it has a slightly different formula than yours (aside from the 4bar scale).
From this post, the 3Bar formula is: * x + 0.161 - y
In the Tephra XML, the 4Bar is: * x - y
What is the purpose of adding 0.161 to x for the 3bar sensor, and/or why does the 4bar item in Tephra XML not add 0.161?

Thanks!

 

Regarding 1), frankly I don't know. I don't even remember how I got to the scaling I have now. I can check the logged values for my 3bar compared to my zeitronix sensor's reading to see if they match up perfectly, but I imagine I would have done that as well when I settled on those scalings. I suspect that changing them for the linear values you propose wouldn't change the logged value very much since they seem to be pretty close.

Concerning 2), I just wrote it like that to make it easier to start at what should be your local atmoshperic pressure and adjust from there. I could have written this instead, which leads to the same formula but is a bit more complicated to explain:

 

Resubscribe.

 

I'm still confused about #2... The 0.161 value, what does it mean and why does it only apply to the 3bar sensor and not the 4bar? Is there a 0.161 PSI offset in the sensor or something that the 4bar doesn't have?

I bought this sensor to use with the Grimspeed boost controller, FWIW, but I don't want to even try MAP-based boost control until the Omni 3bar is calibrated properly.