[kolea]

Hi everyone!
This is my first post here, I hope I'm not in the wrong section, if not, don't hesitate to tell me.

I've just done a Stage 1 on my BMW M140i (B58 engine), and I'd like to know if any of you are able to analyse the logs made, and help me correct them if necessary.

For the record, there are no mechanical modifications.
Original fuel pump and downpipe.
Stage 1 OTS MHD RON98 and I ride 100% RON98.

Here are the Datazap logs:
https://datazap.me/u/kolea/run-4-4-g...38-39-40-41-42
https://datazap.me/u/kolea/run-2-4-g...38-39-40-41-42
https://datazap.me/u/kolea/run-5-4-g...38-39-40-41-42

I hope you'll be able to help me understand, I have a few notions, but I want to be sure that everything runs smoothly .

Thank you all

[n55david]

Fuel isn't good enough for that map. Run the next lower octane map.

[Skyhigh]

To me it looks somewhat acceptable. It is not optimal, as n55david said and for peace of mind you can either add Ethanol or run Stage 1 RON 95 with this fuel, but you can also drive as is. It is ok.
Either way I would run logs again when the weather gets hot, as it will most likely look worse then.

[kolea]

Hi there!
Thanks for taking the time to follow the topic
Last night I did some testing:
2 runs for each map, here are the results:

Stage 0 :
https://datazap.me/u/kolea/stage0ron...38-39-40-41-42
https://datazap.me/u/kolea/stage0ron...38-39-40-41-42

Stage 0+ :
https://datazap.me/u/kolea/stage0ron...39-40-41-42-43
https://datazap.me/u/kolea/stage0ron...39-40-41-42-43

Stage 1 RON 95 (with RON98 in the tank) :
https://datazap.me/u/kolea/stage1ron...-43&zoom=0-253
https://datazap.me/u/kolea/stage1ron...39-40-41-42-43

Stage 1 RON98 (better run than the previous ones) :
https://datazap.me/u/kolea/stage1ron...39-40-41-42-43
https://datazap.me/u/kolea/stage1ron...39-40-41-42-43

Of course, to be on the safe side, I went back to the Stage 0+ map.

Even on the Stage 0 maps I have a little correction, I ordered spark plugs in prevention.

Could you explain to me what the degrees per cylinder correspond to, and what is taken into account in this calculation?
Is there a minimum acceptable value? At what value do we start to run risks?

Skyhigh , as you can see, driving on the RON95 map is not the right solution.

[Skyhigh]

The questions you are asking are very broad. They have been discussed at length in the dedicated thread... I suggest you start there:
https://f30.bimmerpost.com/forums/sh....php?t=1648722
Nothing is black or white - there are many shades of grey.

And I disagree - your Stage 1 RON 95 looks definitely better than the Stage 1 RON 98. You can run that. Clearly Stage 0+ looks even cleaner.

Shortly, I'd asses your logs as follows:

Stage 1 RON 98 - acceptable, but keep an eye on with higher IATs
Stage 1 RON 95 - OK
Stage 0+ - excellent
Stage 0 - excellent

[kolea]

Yes, I came across this topic during my research.
I'm not very comfortable in English, but I'll try to take the time to understand it better and if not, I'll come back to you.

All right, thanks for your analysis. As soon as I saw the corrections, I thought they were no good, hence my concern.

Sorry, but since my English isn't great, I'm having trouble with abbreviations. What do you mean by IATs?

Thanks again!

[Skyhigh]

IAT = Intake Air Temperature.
Meaning when the weather gets hot, spring/summer.

The existence of minor corrections is not an issue. But you need to look at the big picture.

[andyb313]

Do you have other 98/99 RON fuels you can try? not all fuels are equal and going with a higher octane fuel will help clean up the timings.

[kolea]

Skyhigh
Okay, thanks for the clarification!
The weather was indeed cool during my tests.

Noted, thank you

andyb313
No, in France we only have the :
SP95 (RON95)
SP98 (RON98)
E85

For my part, I filled up my tank at TOTAL which sells SP98 "Excellium", although a little more expensive, it represents one of the best station fuels in France.

[Skyhigh]

Just add some E85 and you are good to go! Most countries in Europe don't have E85, so consider yourself lucky and use it

[kolea]

Skyhigh
That's true, yes, the aim is to go full ethanol when I've got what it takes.

Do you have any idea of the % of ethanol I can use?
Knowing that I have the original HPFP.
So I can run the RON98 map with a small % of ethanol in the tank to increase my octane rating and correct my cylinder timing curves?
The best thing would also be to fit new spark plugs (NGK Iridium), which are on delivery.

My tank is 52L if google has the right info

[Skyhigh]

Just add 5 liters of E85 to a full tank and log again. Find the right amount experimentally. With your relatively minor corrections, you will not need much E85 to get clean. I add between 5% and 10% pure ethanol (not E85) to clear mine. So I think with 3-5L of E85 per tank you will be good to go on the RON 98 map.

New spark plugs will not do miracles. Especially if the current are still good.

[kolea]

Noted, I'll do the same logs with 5% E85, then I'll do with 10% to compare, I'll put my results here!

As for the spark plugs, I don't know how old they are, I'd almost like to believe they're original, it won't do him any harm.

I rewatched the topic https://f30.bimmerpost.com/forums/sh....php?t=1648722 and took the time to watch the video, even for a Frenchman, it's very well explained and helped me a lot!

Thanks again for your time