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ReMapping the DI ECU

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99K views 379 replies 59 participants last post by  Phdv61  
#5 ·
I was speaking to a guy a few weeks ago and he mentioned that there is a guy that does a socket conversion for the eprom so that you can swap the eprom easily.
Cost was around $100.
IMO if you can't play with injection timing and limp points when reprogramming the eprom it is a waste of time. I want to run 30+ psi next year so I need a fix for the over boost cut that I get at 28psi

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#8 ·
I really wish I didn't get rid of my eprom programmer. :(

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#21 ·
I agree Geeyoutoo. It would be bloody good.

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#30 ·
Honzak said:
I do not understand this sentence. If it is related to my poor English, then i'm sorry.
If it is related to the subject "Reflashing possibility of DI Ecu", then i am bit dissapointed of your attitude to the subject. I supposed it is about how to do it yourself and not "when you finish, let me know". I know it is not for everybody, but tuning factory ecu is done this way.
I am not professional tuner, just enthusiast who loves challenges. I dont want to sell you final product.
I started with this maybe 2 years ago. Got stucked several times to the point where i wanted to give it up. There was not any public info about this ECU. Seemed no one interested in. I wanted to start public discussion about it as it needs more brains working together.
The task "Reflashing DI ECU" has 2 parts.
First is how to do it physically. It is the easy part. Just change 2 not electricaly erasable chips to another ones. Read old, write modified soft to new. Thats all.
Second part is how to modify the software and understand this ecu. Someone told you, that only fueling can be adjusted. Thats not true. You can change everything, what this ecu does. Boost, injection timing, fueling, glowing, alter curves for sensors like MAF, MAP, temp sensors. Anything what you are able to recognize in the software.
I suppose limits of safe mod controlled by ecu without fooling any sensor, is 22psi of boost and aprox. 80mg of fuel per stroke. Should be 200-220 hp on flywheel with IC upgrade.
One day, when i finish with my car i will go to dyno and measure it. I use my car just for holidays and meetings, so i am not in hurry.


Simple answer is: I talk about first genertion, 00-03 years. The ecu files in this topic are from 2000-2001 cars. 04 should be a facelift. I dont know how you call it - GU4? I think those ones have EDC16 obd flashable ecu. Same engine , but completely different ecu. 07 CRD is again completely different.
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It's not your English mate. Your English is pretty good.
"Lost me at x" is a bit of Aussie slang. Meaning that he couldn't follow what you are doing because he is not one of us tech heads and did not understand. He does understand a fair bit for a "old" mechanical engineer but his generation did not have electronics and computers so a lot of it is rocket science.

Keep up the good work. Im getting very interested in your results.


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#33 ·
lots and lots of learning to do.
I'm impressed with what I've seen so far. :)
Rumpig's advice has been invaluable.

Turning EGR off is a lot better than blocking it because you don't get the associated fuel reduction. Simple too.

There is a lot to WinOLS. Slowly learning it. Did I mention that us IT guys hate having to RTFM. ;)
Drivers Wish will be a fun map.
 

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#40 · (Edited)
Navowner said:
I'm not 100% sure but I believe all DI's need the chips replaced and CRD's can be flashed thru the OBD2 plug. I think 2006 was the year diesels had to become OBD2 compliant.
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You have to desolder both eproms and socket the board first. Then copy the rom to your pc and mod it.
The eproms on a Di are write once. This isn't a issue as you can get rewritable ones for about $4 each. You need a odd and a even chip so that is $8 :)

I need a lesson in injection timing now. Lots more learning....

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#49 ·
I'm doing it as a challenge as well as wanting to go further with my tuning.
There are also things that the unichip can't do that I can easily do with the remap.


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#51 ·
I agree fully agree Geeyoutoo. My initial plan is to develop a remap that raises the limp mode parameters, disables egr and increases performance a bit as well as a performance map to suit advanced mods. The first part is easy. Tuning for performance will take road and dyno time which I'm prepared for.
The biggest hurdle for most people will be socket in the ecu.. luckily this is easy for a electronics tech. I'll be looking into a solution to make this very viable as I know several people that are into this type of thing.



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#68 ·
getalifestyle said:
Is anyone willing to share their "remapped" file?
would be good to have an edited file to compare the ori file with to see where the changes are being made.

also, how are you guys measuring AFR when making changes?
Click to expand...
Technically you can work out AFRs using a bit of math. I'll be doing this initially then putting it on the dyno to fine tune.

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#69 ·
Navowner said:
No ones remapped the patrol yet so there's no files to share. I put my Navara on a dyno twice while I was remapping that, so afr's were measured then but otherwise I was just tuning it by exhaust temp. I have an afr guage on my bike which I plan to put on the Navara at some point.
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Yet being the operative word.
I'll be testing out the ecu and chips tomorrow if the rain stops long enough. :)


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#71 ·
Well today's experiment was a failure. NATS did it's job and the car refused to start.:(

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#98 ·
geeyoutoo said:
Seems strange the torque went up so much but the Kw went up so little. The AFR looks strange as well, were they able to control limp as well? the English company that does it told me they couldn't do that..
Click to expand...
Yes. Maps have been changed to allow faster spoolup without limp.

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