RomRaider

Hi everyone,

Let's put it first that converting to MS41.2 is the best solution and all development should be based on this latest version.

For sure I will upgrade to MS41.2 in the future but for now unfortunately I can't find time for it and would like to stay on MS41.0 ID40 tuning my turbo setup with upgraded MAF.

Activating 2048kg/h mode within RR for MS41.0 IS40 isn't possible since the definitions are not made for this. So I just picked a MS41.1 stock ROM => imported in RR => activated 2048 kg/h mode and analyzed the differences in hex compared to the stock file.The only difference I noticed is that a single hex byte at address 32951 is adjusted from 42 to 32.

Next I compared the MS41.1 file to mine MS41.0 ID40 and found that within MS41.0 at address 28621 the same software configurations are written.



Can someone confirm lowering this value from 42 to 32 will activate 2048kg/h mode within MS41.0?

Thanks in advance!

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Converting to ms41. 2 takes a couple of hour at mody, it's just copying all the tables. You would probably be finished with the conversion by that time if you made it directly instead of trying to find a way around

Agree on that. Need to read and deepen into the MS41.0 to MS41.2 conversion thread.

Main reason is also that the car is running proper now without any faults. My question is also out of curiosity to see if it is that simple to activate the 2048kg/h mode for MS41.0.

I don't want to be rude, but...

1->flash MS41.2 256kb file with 2038kg/hr mode activated in that file.
2->pull partial read
3->copy the cranking tables over from MS41.0 to this partial
4->copy the warmup tables over from MS41.0 to this partial
5->copy the knock tables over from MS41.0 to this partial
6->flash this partial file to your ECU.

MS41.0 to MS41.2 conversion is done! doesn't take you more than 30 minutes.

your MAF is different, you run turbo etc. you will need to retune anyway.

Clear. Let's go that way. Am only curious if it will work activating that way in MS41.0.

There is a specific MS41.2 stock ROM / version which is recommended to upgrade to?

I have to disagree. Perhaps MS41.2 could be used with B28 engine but I am not so sure if it works good with smaller displacement engines (for sure it is not working with B20 and I am not sure if or when we will have ability to run B20 without issues on MS41.2)...
Of course it runs the engine but it is not healthy to have retarded ignition post TDC @warm idle and IAC opened above 95% all the time when idling.
To be honest MS41.2 definition will need a lot more parameters if we want anyone to switch to this code base. There should be also provided proven B20, B25 & B28 base tunes - perhaps not performance oriented but safe enough for everyone to be flashed and later tweaked for their setup.
At least for now most EU engines (at least in N/A form) runs better on MS41.0 software IMHO.

Thats a bit presumptuous to feel that the dev team should simply just provide that.
It has been made clear what is being focussed on. If you're not happy with it, spend the time and figure out the other versions for yourself.

No-one is getting paid for providing all this stuff for you.

Not really, I took the MS41.2 from the stock rom thread.

keep in mind that you WILL reach the LOAD limit when running turbo. and will need to multiply all MAF and LOAD related values in the file.

My EU B28 runs a lot better on MS41.2 than it ever did on MS41.0.

This might be due to English not being my first language. All I meant is that if due to limited resources (time being the issue) the only variant under development would be MS41.2 (newest one, most useful specially in the US) other users should have ability to use that software. There are only 2 ways to achieve it - providing pre-tweaked B20, B25 & B28 (already done) files or adding many missing parameters to MS41.2 definition. For example due to impossible to achieve airflow target at warm (even slightly higher than stock) idle B20 engine will have ignition post TDC which is not only not healthy (due to higher EGTs) but also mean using more fuel than really required... I always thought tuning means optimising but in this scenario it is the opposite.

Already tried few times to run EU M52B20 /M50TUB20 engines on MS41.2 SW and always had to return to MS41.0 stock EU software due to many different issues. Last one (M50TUB20) is still running on MS41.2 only because it is 100% track car. It still throws MAF DTC (it have properly scaled not stock MAF so it is showing real airflow - opposite to warn OEM sensors which reads high enough not to trigger DTC and 12.5kg/h@idle seems too low for MS41.2) and have random drivability issues between 1000 and 2000 RPM (you will never know if it will have normal or next to no power when even slightly accelerating in this range)...
The difference between US S52 engine and M52B28 is quite small (2.4mm in bore, 12,85% in volume) and that is why it is quite easy to adapt MS41.2 SW for M52B28 engine even with limited number of parameters we have available today.

I understand that B25/B28/B30/B3x users are majority... But properly tuned 100% stock B20 engine could get highest possible gains (I already done "a few" in 165-168HP range) and sometimes B20 is all you can use due to race class/rules restrictions...

I have m52b20 with ms41.2 and nissan maf. Runs good on all conditions warm, cold, wot. Only issue is sometime idle ignition advance go to 1-2 degrees.

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Which exact MS41.2 software are you running? Which partial you used? Which maps from MS41.0 you copied into MS41.2?

I spent whole day fine tuning M50TUB20 with MS41.2 and Bosch HFM2 MAF. Most of the time ignition timing @warm idle (800RPM) was post TDC, only when measured airflow was nearly 17kg/h it was few (2-3) degrees BTDC. What load are you seeing at idle?

One of two things are going to happen:
1. Someone is going to step up and PROVIDE that for you
2. The ones who can but don't have the time to are going to get tired of replying to the same sort of topics, get bored, and leave.

I don't really care what happens either way. MS41.3 will force the hand.

I can prepare them and would be happy to share with community but at least for now I do not have anything working good enough to do it It seems B20 needs at least idle airflow target map(s) defined as I do not believe I can make it idle healthy with those maps we have available. For some reason it is opening IAC and retarding ignition much more than really needed... I have seen that on all B20 (M50TU & M52) engines I tried MS41.2 on so could not believe it is related to broken hardware. Also I have tried different sets of MS41.0 maps copied into MS41.2 SW including bare minimum (MAF linearisation, base fuel and knock control only).

Some logs with MS41.2 software and current partial. Setup is M52B20 engine , M50B20 manifold, B28 filter box with nissan maf, no cats.

Yesterday I just flashed above modifications into my ECU: Modified above value in the full flash for activating 2048kg/h mode and used mine M62TU MAF calibration in the 2048kg/h table (which maximum value is about 1650 kg/h).

Car is still running fine during idle and part load. I didn't passed the 1024 kg/h limit yet since I didn't had time yet to start tuning my car on dyno. Which will be this Saturday after which I will place a new update in my turbo thread

However, so far so good and it looks like activating 2048 kg/h mode works for MS41.0 in the same way as MS41.2.