prefered method of fuel trim tuning

[Hiitman]

so which of the three do you guys choose?

Idle Tuning (LTFT-Lo) 50hz
-Set injector fuel settings to what you were already running them at or what is recommended in the DSMLink guide.
-While idling the engine watch the LTFT-Lo and STFT.
-If LTFT-Lo fuel trims are positive, add air at the 50 Hz point in the airflow table.
-If LTFT-Lo fuel trims are negative, subtract air at the 50 Hz point in the airflow table.
-Adjust the airflow 1% for each 1% fuel trims are adjusting fuel.
EXAMPLE: If LTFT-Lo is at a constant +5%, add +5% to the 50 Hz slider in the airflow table. If the LTFT-Lo is at a constant +12.5% and STFT is at +13%, add +26% to the 50 Hz slider in the airflow table. Repeat until you are happy.

Rev Tuning (STFT) 150hz
-After you are done with idle tuning, rev the engine and keep it at the 150 Hz level.
-Watch your STFT's for needed adjustments.
-If STFT fuel trims are positive, add air at the 150 Hz point in the airflow table.
-If STFT fuel trims are negative, subtract air at the 150 Hz point in the airflow table.
-Adjust the airflow 1% for each 1% fuel trims are adjusting fuel.
EXAMPLE: If STFT’s are bouncing between +14% and +16%, add +15% to the 150 Hz slider in the airflow table. Repeat until you are happy.

Cruise Tuning (LTFT-Mid) 250hz
-Drive on the freeway at a steady speed to get stable LTFT-Mid fuel trims.
-If LTFT-Mid fuel trims are positive, add air at the 250 Hz point in the airflow table.
-If LTFT-Mid fuel trims are negative, subtract air at the 250 Hz point in the airflow table.
-Adjust the airflow 1% for each 1% fuel trims are adjusting fuel.
EXAMPLE: If LTFT-Mid is at a constant +7%, add +7% to the 250 Hz slider in the airflow table. Repeat until you are happy.

or

monitor LTFT at cruise. adjust 150 hz accordingly. monitor STFT at idle. adjust 50 hz accordingly.

or

the attachment

 

[Hiitman]

also how much would an old front o2 sensor throw of fuel trim values?

 

[DirtyBirdRacing]

Depending on how old it is it could be a lot, since that is what the ecu uses to adjust the fuel trims in closed loop. The rear o2 sensor which i think all 2g's have is used just to check to see if the cat. is working.

Bill

 

[Hiitman]

well heres a log using this method

this is what i used for my 2g this was created for 2g. thank you
Idle Tuning (LTFT-Lo) 50hz
-Set injector fuel settings to what you were already running them at or what is recommended in the DSMLink guide.
-While idling the engine watch the LTFT-Lo and STFT.
-If LTFT-Lo fuel trims are positive, add air at the 50 Hz point in the airflow table.
-If LTFT-Lo fuel trims are negative, subtract air at the 50 Hz point in the airflow table.
-Adjust the airflow 1% for each 1% fuel trims are adjusting fuel.
EXAMPLE: If LTFT-Lo is at a constant +5%, add +5% to the 50 Hz slider in the airflow table. If the LTFT-Lo is at a constant +12.5% and STFT is at +13%, add +26% to the 50 Hz slider in the airflow table. Repeat until you are happy.

Rev Tuning (STFT) 150hz
-After you are done with idle tuning, rev the engine and keep it at the 150 Hz level.
-Watch your STFT's for needed adjustments.
-If STFT fuel trims are positive, add air at the 150 Hz point in the airflow table.
-If STFT fuel trims are negative, subtract air at the 150 Hz point in the airflow table.
-Adjust the airflow 1% for each 1% fuel trims are adjusting fuel.
EXAMPLE: If STFT’s are bouncing between +14% and +16%, add +15% to the 150 Hz slider in the airflow table. Repeat until you are happy.

Cruise Tuning (LTFT-Mid) 250hz
-Drive on the freeway at a steady speed to get stable LTFT-Mid fuel trims.
-If LTFT-Mid fuel trims are positive, add air at the 250 Hz point in the airflow table.
-If LTFT-Mid fuel trims are negative, subtract air at the 250 Hz point in the airflow table.
-Adjust the airflow 1% for each 1% fuel trims are adjusting fuel.
EXAMPLE: If LTFT-Mid is at a constant +7%, add +7% to the 250 Hz slider in the airflow table. Repeat until you are happy

lemme know what ya think

 

[fp-green-95tsi]

Your idle (50hz) log looks fine. Now move on up to 150hz.