EVO/3G ECU in a 6th Gen Galant

[QnzMostWanted]

I'm using a 3g ecu. Not an evo one..and its cheaper for me to get a maf than to get speed density to get the car started

Sent from my PC36100 using Tapatalk 2

[deeznutz]

No rebuttal? I actually want a good convo someone?

Can't wait for Isaurio to Skool you bro don't worry I'll let him know your looking for a challenge make sure u got your big boy pants on!

[Isaurio]

Why would disabling the rear o2 effect the fuel trims? The fuel trims are calculated with the front o2. The only job of the rear o2 is to check for effectiveness of the cat on a stock car.

If your using a evo8 ecu why not just run speed density of the bat and save your self the trouble of buying a maf.As for injectors you can run any injector you want. You just need to get the global and deadtime.

I believe mitsu did a check balance. Both o2 sensor check each other for a accurate reading to give you a fuel trim. The math of the fuel trims includes the second o2 for calculation period!!. Programers had wrote a extra code to simulate a virtual second o2 so you could delete without affecting the trims calculations. Without that is no other way around it. U could try but you will fail.

Going SD takes a lot of tuning to get running 100% since the computer could not re-adjust itself with any air to fuel changes due to the maf missing. The tune needs to be from the bottom up since he using a different hardware "engine parts" than the evos. Maf would be more flexible with this big changes. All this things are easy said than done. But the ecu or pcm thinks different.

Maf is the way to go for a start up built specially with a totally different ecu. Is not just fuel, timing and injectors needs to be change to get a engine running. Is the little sensors that does most of the job that also needs to be readjusted within the rom.

[Ivory8g]

world first when this is all said and done? I think it is!

[deeznutz]

Uum I don't think he's the first but defiantly one of a hand full at best. In any case major props to Denver this is a conversion u just don't see period.

[imback]

Can't wait for Isaurio to Skool you bro don't worry I'll let him know your looking for a challenge make sure u got your big boy pants on!

Um ok lol


The only purpose of the rear o2 is for checking of the cat efficiency. This is for emissions only. If the rear o2 see's that the reading is low it will throw a CEL and that's it. There a few things that will throw the ecu into open loop but a clogged cat is not one of them. You are right about SD taking time to set up but i'm sure there is a map out there or a map that's close enough to get it running.Hell you can find a stock dsm map and just modify it buy adjusting the the cells in the higher load region. I never got into flashing so i can't say much about that but only thing needed for getting a car running on SD would be a map sensor. A maf would be easier though in the long run since you still have to work out some of the bugs.

[Isaurio]

^ u are missing the ecu comands. Every one knows 2 o2 it check the cat for any efficiency of the AFR but thats one of the job. But like i said is a check and balance, both o2 check for the AFR mixture to check and readjust your fuel mixture, it adjust your injectors to stay at 14.7 on closed loop "o2 monitoring". You cant depend in only one o2 sensor to make a big fuel mixture calculation and chances, the ecu uses 2 o2 to minimize any error to avoid knock and performance. If it gets to lean it will cause knock making the computer go to the low fuel and timing maps. The old 6g and older cars dont need the second o2 because the ecu did not have enough memory to write extra commands to it. Know ecu has more ROM memory and processing power to make fast and more complex calculations.

You cant just plug another map from a SD Rom to non SD rom. People call this base map to get you going and start. Here is the problem. The SD map are made just for that specific component on the engine, injectors, displacement, head, intake mani, map sensor and more. If you transfer the maps to a whole different setup. 1 it will run like shit. 2 you will knock like crazy due to the unbalance fuel mixture. 3 you could damage the engine if you run it for a long period of time since the ecu CANT readjust the fuel mixture. SD always run open loop.

[master_visionary]

Learning learning..... OK question

Y not just weld an o2 bung into your 6G exhaust its easy and whether your right or wrong the 3g ecu can soul with the information it was designed a to calculate

[imback]

The ECU only relies on feedback from the front o2. The STFT (short term fuel trim) is what is used to get the desired a/f ratio of 14.7 assuming this is on regular gasoline. These older cars like the 6g's are based of the same technology that the 1g and 2g dsm use and i have a very good understand of how they work since i've worked on them for a long time.1 I never said putting in another map would make it run perfect but since your able to adjust hence the reason going through all this trouble it wouldn't be to hard as long as you have a basic understanding of how to adjust things. 2 You would have to be so rich in order to get rich knock cause you are most defiantly not getting real knock since the n/t 4g is pushing no were near as much airflow. 3 SD does not always run open loop unless you force it to run open loop. Your running a OEM computer that want's to see feedback from the front o2. If your fuel trims are so off then yes it will be stuck in open loop cause adjustment needed is more then the ecu can do it self and your front o2 will be stuck at .04 volts or .89 volts.

[duh2150]

http://www.dsmlink.com/images/forums/1GECUPinout.pdf

if 3g pin out is the same as the evo 8
http://www.roadraceengineering.com/e...-ecuwiring.htm

does not seem too hard to put together, and remember most of the wires are ground switched

[QnzMostWanted]

i know, im done with the harness, but my car isnt running so i cant complete it

[duh2150]

Dude that was fast!

[QnzMostWanted]

almost done

[QnzMostWanted]

still running the 6g MAF, but SUCCESS!! car starts and idles, havent done further testing cuz im waiting on my timing belt tensioner

OBDII port and flash plug...still figuring out where I'm going to put it


ECU plugged in for testing purposes


FLASH successful


quick video

[mko]

Nice man! I did the same harness conversion, but im still to test it. Great work bro!

[Rach3T8G]

Congrats on getting this done!

[Isaurio]

Good job bro. The response is going to be 10x better.

[QnzMostWanted]

got it to idle a little better, this is still with the 6g MAF

NO CEL

[wetamup2k3g]

Sounds good! What did you do exactly?

[QnzMostWanted]

flashed to an EVO rom, scaled the injectors, adjusted latency, etc etc etc etc lol