C409

iTrader: (5)

.......... In Flags and switches the first item is ..... Use Filter For Airflow ... it is checked in my bin ......... What is this for ? I'm running a single plane intake and solid roller cam ..........
.......... Second Q ... in tables ........ Rich / Lean Offset vs Coolant ........ my bin is set at 16 for temps 68-176 ... the rest are zeroed ...... At cruise my wide band reads 10-20% lean ... can I use this table to get closer to stoich ?

RBob

iTrader: (1)

The "Use Filter for Airflow" is to enable a sliding averaging filter to the airflow value of the MAF. It both smooths and lags the gms/sec value. Part of the reason for this is on tip-in, the initial flow of air flow just fills the plenum, not the cylinders.

As for the "Rich / Lean Offset vs Coolant" table, it apparently only affects the fast O2 value. Which may, don't quote me on this, only affect when a cross-count occurs. Try changing some of the values and see what happens.

RBob.

Saar

FWIW, in A1, it's used to bias the ZEREFU and ZEREFL values.

C409

iTrader: (5)

......... Yeah ... that's easy for you to say ..... but what the hell did you just say ? .............

RBob

iTrader: (1)

Thinking about this it didn't make sense, so looked at the code again. The value from the above table is subtracted from all three O2 values, mean R/L, lower O2, and upper O2. Now that makes sense as it lowers all three the same.

This will have the ECM targeting a leaner AFR at those coolant temperatures where the value is greater then 0 (in the "Rich / Lean Offset vs Coolant" table).

If you wanted the ECM to target a richer AFR can change the three SUBA instructions to ADDA.

RBob.

JP86SS

iTrader: (1)

I made these adjustable in both directions without code changes by adding 100 to all the values in the three table and then using the coolant table to subtract 100 from each value.
That way the changes to the coolant table can increase or decrease the O2 tables all at once.

C409

iTrader: (5)

........ Thank You for the reply ... I first tried adjusting the values in my table up since most other tweaks are add to go richer ... subtract for leaner ... and quickly discovered that it works the opposite way ... you just confirmed what I discovered ........ It seems that I can get the AFR where I need it within the 16.00 range that was in the stock bin ..........