G4X Long Term Fuel Trim

[Oldmanz350]

Hi,

For whatever reason, CLL Long Term Fuel Trim does not exist in my file.

It does however exist in the Base Map files.

How can I add this Feature into My File?

Thank You,

Tim Hampton

[Oldmanz350]

Here is My Current File.

Thank You,

Tim Hampton

 

[Adamw]

You are on very old firmware 6.16.27, long term fuel trim wasnt introduced until 6.18.8.  Unfortunately new features dont just magically appear in your ecu all by themselves, you need to update the firmware to get all the recent improvements and fixes.

[Oldmanz350]

Thank You Adam.....

 

[dingdongdrift]

once the map has been filled out by the ECU what's the easiest way to apply the values to a VE Fuel table?

[Adamw]

You have to do it manually.  For example if you have a LTFT value of 6% in the 3000RPM, 100kpa cell, then go to the same cell in the fuel table and type in "+6%".

Easiest if you set up a page with the fuel table and long term trim table side by side.  

[dingdongdrift]

On 9/18/2021 at 3:58 AM, Adamw said:

You have to do it manually.  For example if you have a LTFT value of 6% in the 3000RPM, 100kpa cell, then go to the same cell in the fuel table and type in "+6%".

Easiest if you set up a page with the fuel table and long term trim table side by side.  

oof, you guys should add a button or function to do that automatically lol. 

[Vaughan]

13 minutes ago, dingdongdrift said:

oof, you guys should add a button or function to do that automatically lol. 

The reason we haven't is because you're not necessarily tuning your main fuel table with the CLL Long term trims, you might be tuning your charge temperature table or warmup enrichment or any other part of your fuel tune that you can focus your CLL on and setup your Long term trim table to suit. Just throwing everything into the main fuel table could result in endless tail chasing. Some other examples would be:

• Tuning ITB with boost, do you put the changes into the rpm/tps table or the rpm/pressure table?
• Tuning Multi fuel do you put the values in fuel table 1, fuel table 2 or some weird mix of the two?

It is something we have considered and decided not to implement for now. Mixture map does have the ability to easily apply changes to the fuel table based on logs that you can heavily filter to remove transients and temperature variations.

[koracing]

I'd really like an option to more easily apply this to the main fuel table as that's 90+% of how I use this table.  It takes a minute or so in excel to do, so not a huge deal, but seems like it could be made optional to more easily implement.  I'll sign a waiver if you want, lol.