EvoIIIAj

iTrader: (1)

Hi guys,

As you all know (if you don't know you do now) the JDM Evo 8 does not come with a map sensor from factory. I got a manifold from Curt Brown ported so I bought an omni power 4 bar map sensor and installed it onto the manifold until I was able to get it wired into my ECU to be able to log boost via EvoScan, I did that today and it's reading etc but I notice at vacuum EvoScan reads from between -5.4608 to -6.8823 and on my AEM boost gauge it reads between -12 to -14 at idle.

I haven't been able to do any logs actually checking how much boost it reads compared to the gauge as I am currently waiting to be tuned but should EvoScan and my gauge be off that much at idle?

I used the formula 0.2369*x-14.7 under the JDM MAP option in EvoScan.

Let me know if I'm doing anything wrong please!

CDrinkH2O

iTrader: (7)

What ROM?

EvoIIIAj

iTrader: (1)

96530706. Does the ROM actually matter? Just for logging? I'm not doing ECU boost or anything.

Terror Rising

iTrader: (26)

Checked my OmniPower 4.0 bar setting in EvoScan and it's 0.2369*x-14.35 (which is compensated for my elevation of +700ft). Did you do the changes in ECUFlash as well? I don't know if it matters or not but there are changes that need to be made.

EvoIIIAj

iTrader: (1)

Yeh I'm on sea level that's why I used 14.7. I didn't do any changes in ECUFlash. What changes would I have to make?

Terror Rising

iTrader: (26)

Again, I don't know if this affects EvoScan or not, but here's what I had to do for my 94170008 ROM.

4 Bar OmniPower MAP

<table name="MAP Test 1: Mid VE Max Voltage" category="MAPSensor" address="2048" type="1D" level="1" scaling="Volts16"/>
<table name="MAP Test 1: Mid VE Min Voltage" category="MAPSensor" address="2046" type="1D" level="1" scaling="Volts16"/>
<table name="MAP Test 2: Low VE Max Voltage" category="MAPSensor" address="204C" type="1D" level="1" scaling="Volts16"/>
<table name="MAP Test 3: High VE Min Voltage" category="MAPSensor" address="2050" type="1D" level="1" scaling="Volts16"/>

Changed in ECUFlash

MAP Test 1: Mid VE High Voltage Test -- Change from 4.61 volts to 4.90 volts.
MAP Test 1: Mid VE Low Voltage Test -- Change from 0.10 volts to 0.06 volts.
MAP Test 3: High VE Voltage Test -- Change from 1.80 volts to 0.51 volts.

In ECUFlash, find the "Periphery2 (FCA) Bits" table. Change bit.9 from 1 to 0. Use the "minus" key on the keyboard. This disables the P0401 (EGR) test.

Changed in EvoScan
Boost(MAP) = 0.2369*x-14.3 (750 ft correction)

Granted, I'm not sure this applies as it's changing the values from my factory supplied MAP sensor to the necessary ones for my OmniPower 4.0 bar. I heavily suggest searching. Hopefully someone who knows more than I will chime in.

EvoIIIAj

iTrader: (1)

Damn that's way in over my head. I'll wait till Tom is ready and he can do that if he needs to lol

EvoIIIAj

iTrader: (1)

It appears as it's only not accurate at idle because under boost it's accurate.

lancerrally45

iTrader: (22)

Mines the same way. I left it alone. Reads fine when in boost.

wreckleford

iTrader: (2)

The AEM is reading in inches of vacuum (when under vacuum) and psi gauge when at positive pressure while Evoscan is reading psi gauge pressure all the time.

ReaperX

iTrader: (5)

What wreckleford said. As long as it reads 0 when logging with the ignition in the on position while the car is not running, you have it calibrated correctly.