Dynotech Tuning

iTrader: (12)

I have been looking into the MAP Sensor tables a bit more lately. I'm not a disassembler (or a good one at least lol) so I don't know what each of these parameters is actually doing or what it affects.

I created some ECUflash scalings so I could change the voltage settings to KPA for each sensor type so I could see things a little more clearly. I started with the Stock USDM and JDM MAP sensors on an Evo 9 ROM. I did notice that the MAP Sensor Scaling tables overlay perfectly, although I dont know what the actual scaling is in reference to.



My big question is that the 'MAP vs BARO' and 'MAP Comparison' tables for the JDM MAP sensor seem to be exactly the opposite of one another, leading me to believe they are labeled backwards.

Can anyone 100% confirm from a JDM evo9 ROM that these are the correct addresses in the disassembly?

-Jamie

Dynotech Tuning

iTrader: (12)

From this, we can easily set the apropriate values for any other MAP sensors used. Again, I still need to know what EXACTLY these parameters do and when they are called upon.

-Jamie

boosted91t

iTrader: (65)

I attempted to figure out what these figures were as well at one time. I was using the kavlico (aem) map sensor with the stock ecu. There are settings for the 5 bar floating around but none for the 3.5 bar.

Even with the scaling sheet for the Omni 4 bar in front of me looking at the figures mr.fred posted I could not figure out what the association was.

https://www.evolutionm.net/forums/ec...5-bar-map.html

Dynotech Tuning

iTrader: (12)

The only 2 that are probably even close to being correct are the OEM sensor settings since they are taken directly from OEM roms. It all depends how these parameters come into play but using the same settings for a JDM 3bar for an AEM 5 bar would seem to be drastically off.

If any code hackers can explain when these are called upon, please let me know.

-Jamie

JohnBradley

iTrader: (30)

I derived the 4 bar numbers way back from the same method as Jamie's graph. I took the 1 bar and 3 bar and known 4 bar voltage vs psi to determine the same ramp. Its time consuming and I see little point in it but it could be done for the 3.5 bar, 5 bar, or Omni 7 bar (done that one actually).

Dynotech Tuning

iTrader: (12)

I'm more curious what each parameter is truly for. As always, the gurus aren't always the best as making the descriptions obvious to the average person lol. Also curious if the MAP vs BARO and MAP Compensation values on the JDM map settings could possibly be mixed up or not.

-Jamie

Dynotech Tuning

iTrader: (12)

I can't make ANY sense of the EGR MAP CHECK#1 & #2. I have no clue what scaling it uses. Grrr.

-Jamie

boosted91t

iTrader: (65)

Were stuck at exactly the same spot again..

What do the "units" stand for as shown in the map scaling charts in your first post on the X axis?

Dynotech Tuning

iTrader: (12)

So I have a huge pet-peeve with the way some of these tables get labeled so the common user has NO FRIGGIN CLUE what they really mean unless you are a coder geek. So I just decided to reword the MAP sensor tables so it may be a bit easier to understand what the value does.

Here are the standard descriptions and below is what I used to help explain their use a bit more. I still havent dug into the EGR MAP check tables yet though.


2003-2004 Evo 8's with MD305600 MAP sensor

MAP Test 1: Mid VE Max Voltage (4.63 volts)

MAP Test 1: Mid VE Min Voltage (0.10 volts)

MAP Test 2: Low VE Max Voltage (4.22 volts)

MAP Test 3: High VE Min Voltage (1.80 volts)

EGR MAP Check 1

EGR MAP Check 2

EGR Pressure Diff (0.12 volts)





Here are the factory MAP Sensor test conditions:




-Jamie

Dynotech Tuning

iTrader: (12)

I would imagine that setting the EGR Pressure Diff to 0 volts would stop the P0401 from ever getting triggered on cars with no EGR valve.

-Jamie

merlin.oz

Nice one Jamie - I like lots.

There are more than a few clues to be found delving into the FSM.

Amending my def right now.

Dynotech Tuning

iTrader: (12)

Awesome

Do you have the address for the MAP Scaling address for the 94170015 rom by any chance?

-Jamie

Dynotech Tuning

iTrader: (12)

So I tracked down the parameters for the Evo 9 but they don't seem to correspond with the values that are currently in a stock Evo 9 USDM rom. I think we may need to have someone do some digging in the code.

In case anyone didnt know, the scaling for kpa is x*0.5 and its uint16.





-Jamie

merlin.oz

I went looking for the map scaling for 94170015 when this thread started - and I have not found it.

Do we know for sure it is in Evo8 roms or is it just an Evo9 thing.

I am also looking for the wastegate Dutycycle Limit v Temp tables in that 94170015 rom, not found as yet.

Dynotech Tuning

iTrader: (12)

I am not certain it's in evo 8 roms. I wondered if the MAP Scaling unknown axis might correspond with the unknown axis for the EGR MAP CHECK 1 & 2 tables but it was only a guess. The EGR MAP CHECK tables bother me the most since we haven't figured out the appropriate scaling yet.

Now my goal is to see if I can find the Evo 9 MAP Sensor tables that match the parameters I found in the FSM since they are drastically off from my findings.

-Jamie