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ReMapping the DI ECU

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#41 ·
"I need a lesson in injection timing now. Lots more learning...."

I tried 3 different start of injection maps on the dyno and there was no difference at all. The only thing I can think of is that the electronics on the vp44 is where the final injection decision is made and changing the main map doesn't have any effect on it.

I've still got more learning to do to.
 
#42 ·
Honzak said:
I am not sure about GU4 ecus, but you can open it and compare with picture in this thread. I posted zip file in one of my post with picture of the ecu board.
I was told, that GU4 should be obd flashable, but i am not sure.
Click to expand...
My 2005 GU ZD30 Di Series IV has the ECU designation K7.

I would be really interested to find out if it is OBD re-flashable. Is there other information on the ECU label that can provide more information if this is possible.
 
#43 ·
geordie4x4 said:
My 2005 GU ZD30 Di Series IV has the ECU designation K7.

I would be really interested to find out if it is OBD re-flashable. Is there other information on the ECU label that can provide more information if this is possible.
Click to expand...
Don't think they got ODBII before 2007, but the easiest way is to pop the lid on it (4 screws)
and post a picture of the pcb.

No danger involved doing that since your already out off warranty :)

Regards
Spawn
 
#44 ·
I searched for pictures of newer Patrol Ecus and result is that on the Bosch Ecus you can see "Bosch" label (Zexel label is not present) and they have different connector (2 plugs). This type of Ecu was always advertised as 07 and newer, so it seems that it was mistake.
The result is: Not everething written on the internet is true :confused: :)
 
Discussion starter · #46 ·
Spawn32 said:
Don't think they got ODBII before 2007, but the easiest way is to pop the lid on it (4 screws)
and post a picture of the pcb.

No danger involved doing that since your already out off warranty :)

Regards
Spawn
Click to expand...
Prior they were only OBDII compliant.


geordie4x4 said:
Just had a better look and mine has the Zexel ECU with the single large plug.
Click to expand...
Hmm! that's interesting, yours being a GU4 I would have thought it would be the Bosch unit, mines a Zexel as well.
 
#47 ·
geeyoutoo said:
Prior they were only OBDII compliant.




Hmm! that's interesting, yours being a GU4 I would have thought it would be the Bosch unit, mines a Zexel as well.
Click to expand...
Yes I had only a small ray of hope that they might have changed to a unit that could be re-flashed without needing to have chips replaced, re soldered etc.
However, it would seem logical that they changed the ECU with the new engine management system for the CRD but in the first GU4 which still has the Di motor, they seem to have used the same old ECUs.
 
Discussion starter · #48 ·
OK I started this thread and have followed it with interest but as a lot of guy's would know all of my mods have been done by me for reliability or simply for the challenge.

Forgetting monetary and challenge aspects I question the realism of a DI reflash as opposed to fitting a UniChip, most guy's would not have the ability to do the potential reflash being discussed, if I had the ability I would love to have a go even if just for the challenge, but there would be so many hidden traps for the layman/unwary, not the least being a failure out on a deserted track where you cannot revert to std/limp home. As said earlier I am looking at a future project that will require a lot of control to get the best out of it, most over and above what I currently have.

Point 1. We know the ECU will not limp for boost until around 26psi and that is way too much for a std turbo to handle on a daily basis and probably for most upgrades as well, if someone wants to go higher there are 2 ways I know of to defeat it.

Point 2. Limp zones, we have ways of handling that as well, we have the JayCar where we also have some fuel management aspects in areas not zoned. The UniChip can hold multiple MAFv to preset limp zones, at least 3 that I can remember.

Point 3. Fuel, as said we do have some fuel control with the JayCar but the UniChip can control fuel to a planned map independently of MAFv.

Your thoughts on this would be welcome as I think there are many out there who may be interested, the thread has had over 1300 hits.

I don't mean for the reflash guy's to stop telling us their work, they are doing great, it's just to get an idea of what the layman thinks as well.



geordie4x4 said:
Yes I had only a small ray of hope that they might have changed to a unit that could be re-flashed without needing to have chips replaced, re soldered etc.
However, it would seem logical that they changed the ECU with the new engine management system for the CRD but in the first GU4 which still has the Di motor, they seem to have used the same old ECUs.
Click to expand...
I recently helped a guy build and setup a JayCar unit for his very late DI it was only 20 or 30 units away from the CRD, he thought he may have had a much later ECU than the "normal" DI but it was not to be. Even on the CRD the pin number allotment is the same as we have.
 
#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.


Sent from my work phone because I don't have the time to get my laptop out. its a Samsung cause im cooler than you
 
Discussion starter · #50 ·
skegbudley said:
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.


Sent from my work phone because I don't have the time to get my laptop out. its a Samsung cause im cooler than you
Click to expand...
Yes, your into the programming side, that's your day job, most punters aren't. My point is that this really isn't going to be an option for everyone and like many other aspects their are other options that will cover most aspects of tuning that would be a significant hurdle, we have found them before and will again. It also cannot satisfactorily be carried out to peak without considerable dyno time.
 
#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.



Sent from my work phone because I don't have the time to get my laptop out. its a Samsung cause im cooler than you
 
#52 ·
It is a steep learning curve and half the reason for me doing it was the challenge . I have spent heaps of time on it and it would be easier to go with a unichip and a couple of hours on a dyno, especially if you already have all the other mods done like Geeyoutoo.
 
#53 ·
#54 ·
I will ask a stupid question. Is there anyway of making a CRD computer work on a DI? Like reprogramming Haltech or Motech, but using the CRD as the base.
 
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#55 ·
patrol4life said:
I will ask a stupid question. Is there anyway of making a CRD computer work on a DI? Like reprogramming Haltech or Motech, but using the CRD as the base.
Click to expand...
i highly doubt it as they work totally different. DI sends data to the pumps ecu which then works out what to inject. CRD works out everything and drives the injectors.
 
#57 ·
Honzak said:
......
I was told, that GU4 should be obd flashable, but i am not sure.
To the immo problem. Immo information is stored in another Eeprom (24C02 SOIC8 type) on the board. I have file for immo off for this chip, but not confirmed it is working solution.
.....
Click to expand...
GU4 is not OBD port flashable, it's the same issue as on earlier Series 2,3 units. However Series 4 had 3 ECU's revisions in 2 years and are backward compatible within the series e.g. last revision can be used instead of earlier revision. Still the Zexel unit.

Regards
 
Discussion starter · #58 ·
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...
In case your wondering why your 3 posts didn't show up, it is because newbies first post must be approved by a moderator, I only just saw yours, have deleted the other identical posts.

Welcome to the forum.
 
#60 ·
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...
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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