GM1 Bar mapsensor

[mitsuko]

I have an MS1V2.2 , running exra 029y4a .
Dual fuel , petrol on inj1 and lpg on inj2 .

I use a gm1 bar mapsensor , and set it as mpx4115 in the settings .
Both sensor curves are very close to one another .
The reason for the GM 1Bar is simply because I had a few avaialble .

This works great , and for tuning the fuel maps , it really doesn't make a difference .

But , I would like to have it all spot on .
So is there an easy way to change the mpx4115 to make it read and display correct values .
I guess it will be similar to he gm3bar , but I'm really not good with software , modifying s19 files , inc files etc .

Thx
Pat
Belgium

[bazzac]

I think you need to use easytherm but i am not the best person with this either. This is where i think i screwed mine up.

[mitsuko]

Wel yes I did use easytherm for the air and coolant sensors
They're spot on now , both of them .


But I cant seem to figure out how to use it for the map sensor .

[jsmcortina]

Changing sensors is a PITA on Megasquirt-1. (Far better on MS2/MS3.)

Moving to TunerStudio section for advice on what's needed.

James

[mitsuko]

I guess that's the price to pay for the simplicity of the MS1 .

Here's a voltage vs kpa table for the gm sensors .
I've put it in an excel graph vs the mpx4115 , and there's only a slight difference .

GM 1Bar : 5 volt full sacle gives 105kpa
MPX 4115 : 4.7 volt full scale gives 115kpa .

The graph says it all .

[jsmcortina]

I guess that's the price to pay for the simplicity of the MS1 .

That's why I haven't used or sold MS1 for many years.

James

[LT401Vette]

If the error is linear, you could edit the ini file to make a correction.
Line 3253:

map = { table(mapADC, "kpafactor4115.inc") }

change to:

map = { table(mapADC, "kpafactor4115.inc") * yourCorrectionFactor }