mchuang

iTrader: (11)

I know most of the roms now have tables defined where you can change the voltage and egr values to compensate for a 3bar jdm sensor. My question is since the voltage is defined and the egr values are now set for 3bar, how hard would it be to use a diff 3bar map sensor like a GM3bar? It seems the voltage may be slightly diff from the jdm, but should be very close and you can wire the 3 wires into the harness. The reason I am so interested in this, is not only for logging, but I would like to have an accurate boost gauge to view in car also, and the only one I know of that will serve dual purpose of viewing and logging is the GM 3bar since the electric autometer uses it(maybe others).

It seems to be pretty similar to doing this
http://rdmelton.autoeducation.com/ca.../boostlog.html



The voltage graph for both are below, one from mrfred and the other from a random site for the GM 3bar


mrfred's findings JDM MAP



GM3Bar GM Part# 12223861 Voltage vs pressure

MalibuJack

iTrader: (5)

The tables in the rom are so you can make the EGR system function properly. The value output to a logger would be a range from 0-255 representing 0-5 volts, all you need to do is get some known calibration info and map it to the digital value. You can then put the right values in the tables and create a formula for mitsulogger or Evoscan.

FWIW I haven't seen anything posted with the new table info for 94170008 or I would have gotten mine set up awhile ago.

mchuang

iTrader: (11)

Your table info is there as far as for the jdmmap 3bar. If that is what you are referring to.

https://www.evolutionm.net/forums/sh...jdm+map+sensor


supported roms so far Evo 8s: 94170008, 94170014, 94170015, 96420007, 96940011
Evo 9s: 88590013, 88590014, 88590015 according to mrfred

chrisw

iTrader: (2)

the only problem I see is the connection into the wiring harness. It would be nice to have some kind of adaptor so you don't have to splice the wiring.

reprogramming the tables is academic with a little experimentation.

nj1266

iTrader: (6)

If your looking for the volts to psi conversion table that you will need to log boost via a GM 3 bar with Logworks, then I have that. GM provides you with the data for the conversion and the attached table includes averaged numbers based on the high and low values that GM provides.

mchuang

iTrader: (11)

Thx NJ,

mchuang

iTrader: (11)

I think I may have to actually wire the sensor to the car and turn the key without turning it on and measure voltage also see how it matches with your those measurements.

nj1266

iTrader: (6)

You need to get a voltage measure at the altitude that you are at. You do that by turning the car on and engine off and getting a reading from the 3 Bar GM sensor. That voltage will be your 0 psi equivelant. At sea level (my altitude) 0psi=1.6v. Your would be different if you are above or below sea level. New Orleans anyone?

mchuang

iTrader: (11)

Do I need to get a max boost reading also?

nj1266

iTrader: (6)

No you do not. The maximum and minimum voltage-psi are included in the table. Just get a 0psi reading and insert the voltage in the table. Then load the table in the logworks boost channel using the configure function from the channel drop down menu.

mchuang

iTrader: (11)

Ok I gotcha, and then logworks will calculate all the voltages for you and the differences based on the current altitude your are at. If this works I can get an accurate boost gauge and boost reading at the same time.

Evol.ved

iTrader: (10)

Is there a web site/vendor where I can order one of these sensors?

Thanks,

nj1266

iTrader: (6)

All Logworks needs is the table that I posted and it will then interpolate the other volt-to-psi conversions.

I had an XD-16 hooked up to my GM 3bar and it dispalyed the boost. Now I have the XD-16 hooked up to the JDM MAP and it displays that data. I currently log the JDM MAP from the ECU and from the LMA2/LM1. The boost data from the ECU is a bit laggy, but the overlap between the two boost readings is very close.

mchuang

iTrader: (11)

If you want a jdm map sensor talk to mrfred they are 125 plus shipping. I am trying to use the GM3Bar GM Part# 12223861 which you can find all over the web for diff prices and diff rebrands. I would like to use the GM sensor because of its popularity and the availability in the US market vs other sensors.

l2r99gst

iTrader: (2)

If you want to use the GM sensor, you should really look into the using the one that I use:

GM 3.3-bar map sensor
9373269 ($55 on gmpartsdirect.com)

wiring harness
88987997 ($20 on gmpartsdirect.com)

It's a 3.3bar sensor, very small (a little more than a square inch for the sensor body), and a nice linear relationship between voltage and pressure. I have been using for quite a while now with an SSi4 and LogWorks.

Here is the datasheet for the sensor:




Eric