So who wants their ECU's "Chromed"?

[Greg E]

My car doesn't cycle to 14.7 at idle, my AFR display 18.6 it's LEANER
At cruise AFR is at 16 - 18
My closed loop don't work correctly why ?
I have nothing changed exept a swap ECU ph1 to VR4 Clone (injector is stock 360cc)

My log: http://mornantautosport.free.fr/3000...s/log0001.xlsx

Stock ECU doesn't use widebands to tune. Not sure what you're expecting. Just 2 little narrow band "guess meters" just after the turbos.

[dyter]

Stock ECU doesn't use widebands to tune. Not sure what you're expecting. Just 2 little narrow band "guess meters" just after the turbos.

I have a wideband for Read the AFR ratio, and it's a poor result. When I scale my injector, ECU lean the injector I don't understand why ? I need a correct 14.7 AFR !

The stock rom isn't stock for me because my old ECU worked fine at 15 PSI ...
Why I have fuel cut at 10 PSI and a lean AFR !?

[Greg E]

Holy crap. Life sucks for you! First off, let go of the notion that you can run a stock American rom/ecu on a European car without needing to make some changes. Your car is not the same as ours.

Lets start with the fuel cut issue. Have you edited those tables? If not, might be a good place to start.

Next, ignore the wideband in closed loop. Not going to do you any good to fret with that. I need you to verify 3 things:

*do the narrowbands cycle?
*does your car have one or two narrowbands?
*if it has two can you verify they go to the correct ECU pins? (This might require you to use a voltmeter and check connectivity)

[BlackStealth]

I have a wideband for Read the AFR ratio, and it's a poor result. When I scale my injector, ECU lean the injector I don't understand why ? I need a correct 14.7 AFR !

The stock rom isn't stock for me because my old ECU worked fine at 15 PSI ...
Why I have fuel cut at 10 PSI and a lean AFR !?

The ECU pin outs differ between USA ECU and Euro ECU. I'd suggest returning to stock ECU for now.

Have you considered using a 1999 3000GT Euro ECU? It's also flashable, but you need to verify the ECU pin outs match.

[Greg E]

The ECU pin outs differ between USA ECU and Euro ECU. I'd suggest returning to stock ECU for now.

Have you considered using a 1999 3000GT Euro ECU? It's also flashable, but you need to verify the ECU pin outs match.

Have you done any more disassembly work with the euro ROM?

[dyter]

I run a VR4 Clone ECU on 93 EU 3000GT with the harness convertion by Brett (THE ORIGINAL VR4 Clone)
The car run almost correctly for 300 HP, but poor and limited boost

I have 2 narrowbands, and there are working correctly (MUT 0x13 & 0x3E) but ECU lean the injector and cycling to lean
I have fuel cut at >9 PSI, I don't understand what

What is the different between US and Euro model ? all composants MAF, IAT, motor, ... are same isn't it ?

[99 vr4]

Try this, it's work perfect for me and log all at 8 times / second, it's too fast !

paramname=FFUELTRIMLOW
paramid=0x0C
scalingrpn=0.1961,x,*,-25,+

paramname=FFUELTRIMMID
paramid=0x0D
scalingrpn=0.1961,x,*,-25,+

paramname=FFUELTRIMHIGH
paramid=0x0E
scalingrpn=0.1961,x,*,-25,+

paramname=FSTFT
paramid=0x0F
scalingrpn=0.1961,x,*,-25,+

paramname=RFUELTRIMLOW
paramid=0x4C
scalingrpn=0.1961,x,*,-25,+

paramname=RFUELTRIMMID
paramid=0x4D
scalingrpn=0.1961,x,*,-25,+

paramname=RFUELTRIMHIGH
paramid=0x4E
scalingrpn=0.1961,x,*,-25,+

paramname=PrimaryO2Front
paramid=0x13
scalingrpn=0.01952,x,*

paramname=PrimaryO2Rear
paramid=0x3E
scalingrpn=0.01952,x,*

My car doesn't cycle to 14.7 at idle, my AFR display 18.6 it's LEANER
At cruise AFR is at 16 - 18
My closed loop don't work correctly why ?
I have nothing changed exept a swap ECU ph1 to VR4 Clone (injector is stock 360cc)

My log: http://mornantautosport.free.fr/3000...s/log0001.xlsx

I have a wideband for Read the AFR ratio, and it's a poor result. When I scale my injector, ECU lean the injector I don't understand why ? I need a correct 14.7 AFR !

The stock rom isn't stock for me because my old ECU worked fine at 15 PSI ...
Why I have fuel cut at 10 PSI and a lean AFR !?

The ECU pin outs differ between USA ECU and Euro ECU. I'd suggest returning to stock ECU for now.

Have you considered using a 1999 3000GT Euro ECU? It's also flashable, but you need to verify the ECU pin outs match.

US 3000GT vs. EUR/JAP GTO vs. EUR/JAP 3000GT
There are subtle differences between the US 3000GT, the European/Japanese GTO, and the European/Japanese 3000GT.

For starters, the EUR/JAP GTO has the 1G style ECU plugs, BUT;

• Two O2
• ECU Controlled Fans
• Can swap a 91 ECU in a 99 Car
• NO FLASH
• NO OBDII / NO Emissions

I have FOUR units in London on various models - one of which is destined for a Himalaya Mountain Race Car!

With the exception of the *surprise* ECU controlled fans, the O2 pin outs were the same.

Dyter
Walter, you have a EUR spec 3000GT which is yet again different. SOME (VERY SELECT MARKETS) 1999 EUR 3000GT's had a flash ECU and immobilizer. These were mostly cars built for Germany, not gray imports into Germany.

Firstly, if you are running stock injectors, you should NOT scale the injectors. If you tell the ECU you have larger injectors that you really have, the ECU will squirt less fuel and you will run lean.

You also mentioned 15 psi of boost. Are you running a boost controller and what kind? Too much boost is too much load and the ECU will boost cut UNLESS you change the max load table.

I have sent you an email to verify the O2 sensor pin out information.

en français

Greg E.
Greg, can you please verify that the address locations that Walter is referencing above for his Tactrix log are correct?

[dyter]

Thanks for reply, I have a boost controller, hot wire pump ..., and on my original ECU I can run 15 PSI with no problem with my 360cc injectors ! (with IDC 125 % !)

I think my O2 sensors (narrowband) work, because values are logged and showed by tactrix:

paramname=PrimaryO2Front
paramid=0x13
scalingrpn=0.01952,x,*

paramname=PrimaryO2Rear
paramid=0x3E
scalingrpn=0.01952,x,*

My mail: dyter@free.fr

[Greg E]

I run a VR4 Clone ECU on 93 EU 3000GT with the harness convertion by Brett (THE ORIGINAL VR4 Clone)
The car run almost correctly for 300 HP, but poor and limited boost

I have 2 narrowbands, and there are working correctly (MUT 0x13 & 0x1F) but ECU lean the injector and cycling to lean
I have fuel cut at >9 PSI, I don't understand what

What is the different between US and Euro model ? all composants MAF, IAT, motor, ... are same isn't it ?

No. They are not the same. You drive a GTO on the right hand side if the car, we drive a 3000GT on the left side. Lots and lots of differences. The truth is, we don't know what all the differences are. Every country had its own laws and Mitsu changed the car to meet those standards in every country. We just don't have a lot of hands on data to be able to catalog all the differences. On top of that, many people import cars and thus that further complicates things.

Even in America these cars changed over the years. Even a true 93 US spec car can't run a 98/99 ECU in it without making mods to the code. This is because in 1996, the govt passed a law requiring every single car must comply with a standard called OBD2. As such, Mitsu had to completely change the way the code worked. Then again in 1998, the govt stepped in again and demanded all ECU must be flashable and again the code had to be re-writen.

The big changes over the years are the emissions equipment. I'm guessing (can't say for sure) that your car doesn't have an EGR, doesn't have a MAP sensor, doesn't have the fuel tank pressure sensor. Does it even have a check engine light??

See, to make all this extra crap work, there needs to be compensations to the fuel calculation to make the car run correctly. If you don't have all this equipment but you're running the code for it, things aren't going to be simple plug and play.

I really really really need you to verify that the o2s cycle as this is how the code is designed to work. The voltage will fluctuate between .1 and .9 volts consistently. If this is happening, you should be getting your numbers on your wideband closer to 14.7 like you're expecting. FWIW, my completely stock 98 almost never consistantly ran 14.7 in closed loop. Sometimes it was in the lower 13s, sometimes it was in the upper 15s. See, narrow bands just aren't very accurate. This is why I tell people to ignore the wideband while the ECU is in closed loop mode.

Brett's early harness had the front and rear o2 sensor pins swapped. This is due to a misunderstanding in the manual. It wasn't until we verified this on a few cars that this was happening but unfortunately many harness have been sold with this issue. I suspect BlackStealth and Boomslang harnesses were the same too but I don't know for sure.

The problem with these pins being swapped is the code is trimming the front and rear injectors with the opposite sensor and as a result, the fuel corrections cause one bank to run max rich and the other max lean. As a result, the motor doesn't run very well.

This is why its important for you to verify your adaptor harness has these pins maps out correctly. I really need you to do this before we continue with anything else.

At the same token, it seems clear you haven't done any reading at all into the functions of the code. It seems you're just looking for a simple plug, play and drive solution. I can tell your right now, this isn't going to happen. You will need to change several parameters in various tables to make the car run the way you want. This is going to take time.

[Greg E]

Greg E.
Greg, can you please verify that the address locations that Walter is referencing above for his Tactrix log are correct?[/QUOTE]


We NEED everyone to log using evoscan thru the MUT protocol. These OBD2 loggers are not going to work for what we need them for. There are many parameters that need to be logged (not just O2s) and OBD2 does not have the ability to log them (like knock for example). If the OBD2 packet rates were even half as fast as MUT I would persue designing a better one but there is nothing in my knowledge range that can get around the slow packet rates.