MBE AJP V8 ECU EPROM dump

[Juddder]

I've been asked to not release some of the EPROM images I now have because they have some proprietary code, which is totally fair enough, but the good news is that it's enabled me to work out some versions that were released and for what cars they were designed

There is also an extra version number not used in the ECU software which I have included below.

1. 928(x)0240 [AJP V8]
2. 928(1)0270 [AJP V8]
3. 941(x)0034 [AJP V8]
4. 941(1)0035 [AJP V8]
5. 941(x)0090 [S6]
6. 941(x)0100 [S6]
7. 941(3)0101 [S6]

I've noted the difference between the AJP V8 and S6 versions by checking how many Injectors the ECU diagnostics software is trying to monitor for each version - Two banks of 1357,2468 for the V8 and 123,456 for the S6

Later ECU software appears to have additional logging such as BuzzLogger, SpeedLogger, WaterLogger etc. including an OilLogger, even on the V8 at version #941(1)0035

The ECU EPROM on my own car, #941(1)0035, is encrypted with a ECU vendor key, interestingly, so I wrote a decrypter for that as well which I'll publish details of when I get a second.

Hopefully this is of interest to some others out there, and I've been chatting with mikesr about the fan temperature modification which I'm verifying

Edited by Juddder on Monday 17th August 17:45

[RFC1]

How do you tell which version your own car has ?




Sandy

[Juddder]

RFC1 said:

How do you tell which version your own car has ?

Sandy

It's in the EPROM code at different addresses

- #94110335 (0x1152 onwards)
- #92810270 (0x1024 onwards)
- #94130101 (0x512 onwards)

I believe the ECU Diagnostics also shows it in the main screen when it is running, but it won't run on the machine I'm currently on

Here's a comparative screen grab:



Mine, now unencrypted, is on the left

Another loaned to me is in the middle

And my Speed 6 one is on the right

[Juddder]

Juddder said:

I believe the ECU Diagnostics also shows it in the main screen when it is running, but it won't run on the machine I'm currently on

Yes it's in the screen grab below, bottom status bar center

The picture borrowed from previous post but showing #92810270 and shows that it has loaded ECF file 9280270.ecf (which is probably 7.3 characters long as I believe yonks ago that used to be the DOS limit for filenames!)

[Tanguero]

DOS limit is 8.3 (not that its particularly relevant!)

[Juddder]

Just to update the versions, there is also a rouge later S6 version out there which Peppe picked up earlier in the ECU diagnostics software thread (a good few years ago now)

That would make the list of versions released as:

• 928(x)0240 [AJP V8]
• 928(1)0270 [AJP V8]
• 941(x)0034 [AJP V8]
• 941(1)0035 [AJP V8]
• 941(x)0090 [S6]
• 941(x)0100 [S6]
• 941(3)0101 [S6]
• 941(3)0116 [S6]

[diedvdijk]

Hello All,

Since a few days i am owning a Cerbera 4.5 which is fantastic. Since I have my own dynoyet i could wait to put the Cerbera to show all the horses i got. I discovered the Cerbera only has a minor 340 hp which is not what a 4.5 should have. So no I am looking for the hidden horsepowers. I take a look on the engine data by logging data during the runs and discovers there might be some problems their.

I downloaded easimap 5.5 and 6.0 but both programs doens't give me any access to the fuel and ignition map. I was curious by finding out what value it should put for igntion timing during the run so I could verify things went right. When looking at the other tabels it looks like a big mess in all data. Correction tables which I can access looks wierd to me.

I opened up my ECU and find a chip with some headwritten tekst and also 4.2 which feels very strange. How come the car has 4.5 chip, also the tekst "workshop was written on the ECU case.

So I am looking for a stock 4.5 now. So I can restore the standaard settings to my car and furthermore play around with programming the car with easimap. Since I have my own dyno I can play days.

Is there anyone here who can help me understanding this point and maybe tell me something more? Why is my car not performing and why is there a handwritten chip (looks a special made one) with 4.2 on it. The only thing I can think of its because it has the 4.2 intake manifold on it. Dont know why since its a real 4.5 looking at the engine numbers. The engine number is the original engine.

So I want to find out more and also understand the 4.2 intake manifold is not that bad. Hope to find someone who can help me with the chips or can explain me why i cant acces the fuel and ignition maps on my own ECU.

Thanks! Diederik

[Gazzab]

What year is your car?
Is it a late 4.2 (which is a 4.5 with 4.2 intakes)?
Have you tried the software to check how the engine is running?
Your car is about 20 or 30 bhp down on a 4.5 before it’s remapped. A 4.5 with 4.2 intakes might get to 400 with a remap.

[Byker28i]

This really sounds like a late 4.2 Cerbera, by which time they were putting 4.5 bottom engines in with the 4.2 induction, which is good news, because a friend has one of those which was mapped and gives 380bhp, so you're not far off. A factory 4.2 was around 340bhp.

[ukkid35]

diedvdijk said:

Since I have my own dyno I can play days.

If the car is going to spend any significant time on the dyno, I recommend that you improve the heat shielding is some areas

For instance, coolant expansion tank, gearbox reverse switch, PS hydraulics, clutch hydraulics, fuel lines, crank sensor wiring

[diedvdijk]

Hi all,

Thank you for the replies. For sure it's a 4.5 from 1998. It's also the right engine number and 4.5 on all the papers. I think the 1998 4.5 is really a 4.5. I have no idea why they put this 4.2 intake manifold on my cerbera. It also has a 4.2 fillercap and 4.2 injectors. Will try to configure the MBE Ecu myself. I have ordered an empty chip and chip burner. Good advise about the heat shields. Thanks. Anyhow does someone know how to access maps and or has someone a stock 4.5 file which is fully accessible. Will try to upload the power graph later. But from 4500 rpm the power curve is almost flat. I find out the 4.2 manifold has some really bad edges.

[Byker28i]

Here's my graphs on my 4.2, mapped, with some inlet work and ACT manifolds

Old factory engine mapped


After a full rebuild

[diedvdijk]

This is my graph now. Ignore the upper two since the car had wheelspin on the dyno and didnt roll all rollers. But the flat line is something I really dont understand.

Btw is there anyone here who can help me how I should work with easimaps and unlocking the fuel and ignition map?

[Gazzab]

Looks like user error.

[diedvdijk]

Its not a user error. Its the cars power. Doing it over and over again.

[Gazzab]

diedvdijk said:

Its not a user error. Its the cars power. Doing it over and over again.

Having seen 100s of cerbera dyno graphs I have never seen the shape you are seeing. So you have a problem which I guess is wheelspin.

[AW111]

It definitely look like wheel spin, probably at close to peak torque.

Can you run it in a higher gear?

[diedvdijk]

Hello,

Thank you all for the answers. It was in fifth gear at 320km/h. I am pretty sure there was no wheelspin. There was wheelspin in the first two runs, which results in the higher graps. Its a dual roller and the rear rolers where not spinnen to the maximum speed. Therefore its looks the car has more power but is wasnt since it doesnt fully roll the rollers.

The low measurements could be repeated easily and results are equal everytime. Its really the car that only powers 340hp and has a very flatten power graph. Its hiding power but I can get to it since I am not able to program and unlock my ECU.

Diederik

[Gazzab]

That really doesn’t look like a mapping issue.
Assuming you have the car set up properly eg pots, then it must be wheelspin...?

[Byker28i]

Is that right measuring in fifth gear? I think all the runs I've had have been in second or third gear?