Fuel map tuning methods

328i-sport-rossi · **Joined:** Tue Jan 24, 2017 11:58 am **Posts:** 478

Hi All.
Maybe its been done but is there any formula or ready made excel template that is able to convert Lambda data to AFR and then somehow have to ability to create a Table in excel in relation to the fueling base map so everything is able too correlate and allow almost tuning of Lambda.

Cheers all

dx4picco · **Posted:** Wed Feb 19, 2020 12:49 pm

For a given load and rpm, the average value in time of your lamda integrator is exactly the percentage of fuel you should add or remove from you fueling table in the cell coresponding to that load and speed.
If you want to be fancy and calculate the average AFR then you only need to add this average to 100, divide the sum by 100 and then multiply by 14.67

328i-sport-rossi · **Joined:** Tue Jan 24, 2017 11:58 am **Posts:** 478

dx4picco wrote:

For a given load and rpm, the average value in time of your lamda integrator is exactly the percentage of fuel you should add or remove from you fueling table in the cell coresponding to that load and speed.
If you want to be fancy and calculate the average AFR then you only need to add this average to 100, divide the sum by 100 and then multiply by 14.67

This is exactly what im asking, if there is a formula or created template that could basically show you Base fuel table as Lambda, If this was possible then tuning fueling would be a dream.

busterhax · **Joined:** Wed Jan 22, 2014 10:54 pm **Posts:** 1774

328i-sport-rossi wrote:

dx4picco wrote:

For a given load and rpm, the average value in time of your lamda integrator is exactly the percentage of fuel you should add or remove from you fueling table in the cell coresponding to that load and speed.
If you want to be fancy and calculate the average AFR then you only need to add this average to 100, divide the sum by 100 and then multiply by 14.67

This is exactly what im asking, if there is a formula or created template that could basically show you Base fuel table as Lambda, If this was possible then tuning fueling would be a dream.

No. It's IPW and everyone runs different injectors. This would have been done a long time ago if it was possible.

mrf582 · **Posted:** Sat Feb 22, 2020 8:01 pm

328i-sport-rossi wrote:

dx4picco wrote:

For a given load and rpm, the average value in time of your lamda integrator is exactly the percentage of fuel you should add or remove from you fueling table in the cell coresponding to that load and speed.
If you want to be fancy and calculate the average AFR then you only need to add this average to 100, divide the sum by 100 and then multiply by 14.67

This is exactly what im asking, if there is a formula or created template that could basically show you Base fuel table as Lambda, If this was possible then tuning fueling would be a dream.

The main fuel table for this ECU is great from a tuner's perspective. Because it takes into account the high-flow low-IPW effect from huge injectors, into the main fuel map. It also takes Load vs IPW compensation into account where other ECUs that use a special 'injector scalar' value, need a separate table.

Want to re-quote an earlier post of mine...

Quote:

A lot of other cars condense the entire 12x16 Fuel table to a single value known as "Injector Scalar" which is proportional to Load. And it works just fine. Some of them have an additional Load vs RPM table that modifies this to fine tune based on various mechanical variance caused by harmonics due to fuel pressure, intake manifold resonance, etc.

ThatSoftwareGuy · **Joined:** Sat May 04, 2019 9:23 am **Posts:** 51

Acidhack wrote:

Hello enthusiasts I also want to share my method if it is useful (or if it is wrong to fix me).

1. Make sure the car does not have a problem with the probes and does not take air from somewhere.

2. Enter Adaptive Fuel Learning and Open Adaptive Fuel Learning - Minimum ECT. There I set a 105 degree value (temperature that the engine will not achieve if it is ok) This change will exclude the LTFT. A computer will only work with the STFT.

3. We expect to warm up the engine optimally. We start logging in - we need 4 values - Load, RPM and Lambda Integrator 1 and 2

4. Then open the logos with the mafcalling program.

1. Load the log

@Acidhack can you please tell me if I have to modify my .CSV file logged with RR? In no way I achieve that the column titles will be displayed in the dropdown menus. Only numbers and it looks like it is reading my log from lef to the right..

UPDATE - SOLVED: Inspected the test files from the MAFScaling application in where the separation between numbers is a comma (,). So modified my RR log in where I replaced al semi colons (;) for a (,). Now it works fine.

ThatSoftwareGuy · **Joined:** Sat May 04, 2019 9:23 am **Posts:** 51

Acidhack wrote:

Hello enthusiasts I also want to share my method if it is useful (or if it is wrong to fix me).

Hi @Acidhack,
I can confirm your method is very useful. I think especially with upgraded injectors after calculating the preliminary fuel based on new injector size, this is the right first method to start with.

I upgrade mine stock injectors to 440cc Bosch ones and started with a 0.525 multiplier based on the information below:
Stock ones = https://www.injectorplanet.com/products ... 0280150558
Upgraded ones = https://www.injectorplanet.com/products ... 0280150558

After disabling all fuel corrections, enrichments and long term fuel trim I noticed the engine was running too rich in most situations (-15 up to -20%). Probably injector size multiplier was a bit off.

Attachment:

Lambda Integrator Mean - OLD.JPG

After implementing these deviations into the base fuel table, logging again and implementing the data in MAF Scaling, it looks already a lot better as you can see below.

Attachment:

Lambda Integrator Mean - NEW.JPG

Thanks for the useful information and tool sharing

Mcgyv3r · **Joined:** Tue May 19, 2020 3:38 am **Posts:** 8

Hey Guys hope all is well,

I'm trying to enlarger my fuel maps to accommodate a super charger on my s52 I've been searching the forums to try and find the answer and either I've missed it or couldn't find i.

Can anyone help point me in the right direction?

dx4picco · **Posted:** Sun Oct 11, 2020 3:42 pm

you can change the axis of your fuel/ignition table to accomodate for higher loads. In Fuel / Ignition timing Axis rubric. then X Axis Load

Mcgyv3r · **Joined:** Tue May 19, 2020 3:38 am **Posts:** 8

dx4picco wrote:

you can change the axis of your fuel/ignition table to accomodate for higher loads. In Fuel / Ignition timing Axis rubric. then X Axis Load

Forgive my ignorance as I'm new to this and have yet to learn how to change tables. I know it has something to do with copying the table and using excel

busterhax · **Joined:** Wed Jan 22, 2014 10:54 pm **Posts:** 1774

Mcgyv3r wrote:

dx4picco wrote:

you can change the axis of your fuel/ignition table to accomodate for higher loads. In Fuel / Ignition timing Axis rubric. then X Axis Load

Forgive my ignorance as I'm new to this and have yet to learn how to change tables. I know it has something to do with copying the table and using excel

Honestly if you aren't sure how to change tables, you should start smaller than tuning fuel for a supercharger setup. There are serious consequences for incorrect fueling on boosted setups.

Mcgyv3r · **Joined:** Tue May 19, 2020 3:38 am **Posts:** 8

busterhax wrote:

Mcgyv3r wrote:

dx4picco wrote:

you can change the axis of your fuel/ignition table to accomodate for higher loads. In Fuel / Ignition timing Axis rubric. then X Axis Load

Forgive my ignorance as I'm new to this and have yet to learn how to change tables. I know it has something to do with copying the table and using excel

Honestly if you aren't sure how to change tables, you should start smaller than tuning fuel for a supercharger setup. There are serious consequences for incorrect fueling on boosted setups.

I've been studying and learning the fundamentals to doing proper calculations and safety practices for creating a base tune for the past year. I feel confident enough to attempt this i just don't know Rom Raider.

Im a mechanic I have worked in two machines shops rebuilding gas and diesel engines. I recently rebuilt my motor top to bottom before putting the supercharger on. Not trying to brag just want to clarify that this is just a new venture for me to learn more about my craft. worst case i have to rebuild the other s52 block I have.

Any help is truly appreciated

busterhax · **Joined:** Wed Jan 22, 2014 10:54 pm **Posts:** 1774

Mcgyv3r wrote:

I've been studying and learning the fundamentals to doing proper calculations and safety practices for creating a base tune for the past year. I feel confident enough to attempt this i just don't know Rom Raider.

Im a mechanic I have worked in two machines shops rebuilding gas and diesel engines. I recently rebuilt my motor top to bottom before putting the supercharger on. Not trying to brag just want to clarify that this is just a new venture for me to learn more about my craft. worst case i have to rebuild the other s52 block I have.

Any help is truly appreciated

It's the same as any other tuning application. Modifying tables is universal. https://sites.google.com/site/openms41/ ... -romraider

Mcgyv3r · **Joined:** Tue May 19, 2020 3:38 am **Posts:** 8

busterhax wrote:

Mcgyv3r wrote:

I've been studying and learning the fundamentals to doing proper calculations and safety practices for creating a base tune for the past year. I feel confident enough to attempt this i just don't know Rom Raider.

Im a mechanic I have worked in two machines shops rebuilding gas and diesel engines. I recently rebuilt my motor top to bottom before putting the supercharger on. Not trying to brag just want to clarify that this is just a new venture for me to learn more about my craft. worst case i have to rebuild the other s52 block I have.

Any help is truly appreciated

It's the same as any other tuning application. Modifying tables is universal. https://sites.google.com/site/openms41/ ... -romraider

Thank you

Climbanderson · **Joined:** Sun Jul 19, 2020 9:27 pm **Posts:** 8

Hey guys!!
Pretty new to tuning and feel like I've been stuck at the same point on my car for a while now. I have a 97 z3 with an M52b28, the engine has a bosch 803MAF, m50 manifold, an SC14 supercharger peaking at around 5-6 psi, as well as 42lb injectors. Also have a wideband o2 so I can read AFR
I've been able to rescale and get all the MAF tables sorted.
I adjusted the 42lb fuel base and cranking maps using Pazis method as well as zeroed out the vanos and COP enrichment maps
Then logged as described in his method

My questions are (or things im genuinely confused about at the moment)
-Should I choose the points with the most "hits" when looking at the scatter plot in MLV?
-Confused about scaling the load axis to 1024
-Don't see how pazi got the fuel map he did using the loads and formula displayed in the screenshots

Really just any help or education would be very much appreciated, would love to learn more just beginning to get overwhelmed learning it all on my own. Watched Pazis youtube videos on MS41 tuning, great help!!

RomRaider

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