Raceghost

iTrader: (4)

Hi Guys, need some Guru Help, that will hopefully help some others in a tuning section. I tried P.M.s but they were full, so had to start a thread.

Any chance you could give these a peruse. I found a situation where trims seem to be working, but they come and go in logs based off of water temp. I also found a post with relative data to support this idea stating that there is a theoretical water temp switch vs fuel trims, that is only switched at coolant temps above 80 C. Can you confirm or deny? Below is the thread I started for both the fuel trims, as well as the tuning for colder thermostats. Any help would be greatly appreciated. If there is a switch, I would love to add it to the tuning for colder thermostats thread for the help of others that wish to run a colder thermostat and still use trims for tuning.

https://www.evolutionm.net/forums/ec...-thoughts.html

https://www.evolutionm.net/forums/ec...hermostat.html

Thanks in advance

WytWun

The value you're at least thinking of is known as "Min Coolant Temp for Closed Loop" in most of the stock ROM definitions, at address 0x15AA for 94170015 (stock value is 0x2F, which scales to 7°C).

This value doesn't seem to be in some of the Tephra ROM definitions that I quickly checked.

ace33joe

iTrader: (2)

That value decides when O2 feedback trim starts working, not sure that also determines when LT fuel trim starts updating.

Raceghost

iTrader: (4)

Have it in my definition file, and yes,

Is for 02 Feedback trim. And it is already set at stock value of 7 Degrees C. No dice.

This is most likely a switch that was overlooked in disassembly because of how complex I have heard that the coding for the fuel trims is.

Raceghost

iTrader: (4)

Bump

Raceghost

iTrader: (4)

Bump. Will pay for this.

Raceghost

iTrader: (4)

How does $100.00 sound for anyone?

Raceghost

iTrader: (4)

How does $100.00 sound for anyone?

Chatty

Try this for ROM 94170715:

Raceghost

iTrader: (4)

Holly ****. YOU ROCK, who ever you are. This looks to be the ticket. Not sure why it is not in my tuner Def file.

Looked in all previous versions, stock ROM file, etc. Does not look like it was ever in there.
Was this defined somewhere on this forum? I searched pretty extensively with no luck. But then I might not have searched correctly.

If this works, payment your way. I was thinking this has never been defined. How much you want?

merlin.oz

Ryan, 15FE is the water temp to enable LTFT learning.
That, and all the other closed-loop 1D parameters are included in my latest xmls.
Something like 54 parameters. Some are legacy though.

Raceghost

iTrader: (4)

The one I got from you over the summer, did not include that def. I have added it though.
Since changing the Thermostat to a 76C, rarely would I see LTFT's unless it got up above 82C, which since it is winter here, no joy. So I hope this is the right one.
Thank you.

EDIT: Just rechecked to make sure I didn't botch your file, and no, was not in your original that I made a backup of over the summer. What's the chance of an updated one from your way?

Thanks

merlin.oz

Updating that US Evo8 xml is on my to-do list