evo9 ecu changes

[trinydex]

there are apparently 3 versions, 13, 14, and 15. the earlier ones are holding more boost.

any additional information is welcome.

[Terenus]

Hmm...where are you getting this from?

[Terry S]

there are apparently 3 versions, 13, 14, and 15. the earlier ones are holding more boost.

any additional information is welcome.


So basically the build date determines the ECU version?

Terry S

[trinydex]

but i don't know which dates.

this was talked about in the ecuflash forum on evom.

[earlyapex]

yes the newer builds run less boost and therefore about 10 less wtq from what I have seen.

[Terry S]

yes the newer builds run less boost and therefore about 10 less wtq from what I have seen.


Well, I have a first batch IX and I know mine peaks at 1.55bar or so in 3rd and 4th... Makes sense why they'd lower the boost.

Terry S

[GokuSSJ4]

Is this a certain type of flash or is the ECU itself a bit different from factory ? I wonder if they ever had knock problems with the earlier models for running excessive boost :? or perhaps other reasons why they decided to provided different amount of boost for different batches.. Perhaps meeting Smog regulations ?

[Terenus]

Is this a certain type of flash or is the ECU itself a bit different from factory ? I wonder if they ever had knock problems with the earlier models for running excessive boost :? or perhaps other reasons why they decided to provided different amount of boost for different batches.. Perhaps meeting Smog regulations ?


He's talking about ECU straight from the factory.

I really doubt the couple pounds of boost would make it fail regulations.

[Blak94GSX]

It was lowered to reduce knock. Most were running 23PSI peak, which is a lot for a car they have to warranty on all kinds of crappy pump gas.

Not a big deal since the first mod for any EVO should be a boost controller anyway.

[c32c7]

Anyone know the different build dates that come with each version ECU?

[trinydex]

There appear to be 3 versions of the JM8859 EVO 9 (north american market) ECU.

JM88590-13 original release
JM88590-14 first revision
JM88590-15 second revision

There has been a lot of discussion lately that EVO 9 cars produced later on in the model run are not registering stock dyno numbers or running trap speeds as high as the early run cars.

I purchased my 9 in July and it had the latest (15) software loaded.

So, out of curiosity, I downloaded the version 13 and 14 maps. I did a quick check of the high octane timing 1 and 2 tables as well as the high octane fuel table and compared the maps to each other. As far as I can tell those specific tables are the same across the board. But when comparing the 13 and 14 maps to the stock 15 map loaded in my ECU via ECUFlash, there are differences. I haven't yet documented them, however.

Right now I am running the 13 map. My car feels a little quicker and boost seems to spike a little higher, but it's all very subjective and the butt dyno is a known liar. I'm going to hopefully sit down and compare all the values between all three maps tonight to see if I can find what Mitsu changed from version to version. That is if someone hasn't done so already. But I searched and haven't found any posts from anyone saying they have.

[mifesto]

guess its for all u pee gas runners :)