The boost definition in EvoScan is setup for the JDM MAP sensor, but it logs absolute boost. I just subtract off atmospheric pressure to give differential boost which is what people normally think of as boost.

 

Quick question from the computer illiterati: <--Yes, I am a third person pluralality ...and I apologize in advance, this will probably be the first in many, many questions that many of you find woefully simple.

I did the additions to the 96940011.xml file for the JDM MAP sensor...

When I downloaded and saved the ROM I gave it a '.hex' suffix. I opened the ROM in ECUflash and no new category for the JDM MAP sensor...hmmm

I change the suffix on my saved ROM image to '.bin' and voila, it works...hmmm, again

Why is this?

 

aka gauge pressure

but we are not logging the same thing here....They added the extra sub rountine instead of just switching the current logging line from the factory map, so you can switch between the jdm and usdm map without having to change the data.xml file each time

Anyone else having issues with the JDM map sensor reading high

Mine read 28psi on 91 octane today@ 4k, however 0 knock

 

Mine is spot on.

 

mine matches my gauges

 

strange, very strange, i remember nj had issues with is?

 

just read his post...it was just slightly laggy and maybe off my .5psi

I must have the stock turbo that could...it holds 22.6psi at 7k...24psi at 6k

I dont trust my boost gauge, ill have to install one of the .1psi resolutions gauges from work

 

UCB, I take it you calibrated the sensor with the ign on?

 

I didnt calibrate it, I just plugged in 14.4 for the gauge pressure offset. Is there some sort of other calibration required?

 

lol.

yes, you need to calibrate it with key on but car off. See what it reads. It should be close to 0 as possible. If not you need to change the setting.

 

k reads .002psi when the car is off, reads around -8.5psi while at idle

 

Your MAP sensor values with the ign on / engine off and at idle are spot-on. Can you post a log or graph showing boost at WOT from 2300-7000 rpm?

EDIT: Can you also include 2-byte load?

 

Im playing with my boost settings so its very possible im hititng 28psi...timing is very conservative, perhaps explaining the low amount of knock considering what boost target im hitting. Only perplexing thing is why I didnt hit boost cut.

My laptop is being funky too, so need to iron that out, I havnt done the 2-byte load mod yet

Will try some things and log it again today

 

One thing to keep in mind when logging with the JDMMAP sensor is that it picks up noise since it is mounted on the intake. So if you spiking to 28 psi, that is more than likely noise. Evoscan reports data as is and does not allow you to smooth out the noise from the boost.

When I log with the JDMMAP, I use Logworks and log directly from the sensor and not from the tactrix cable. Then I apply about 0.25-0.40 smoothing. This makes the boost almost the same as the GM 3 bar MAP sensor that is mounted on the firewall and does not pick up noise.

 

its not a spike like you would suspect from sensor noise. The boost profile actually looks amazing..if I was on C16