MoTeC Global Forum

Questions on DBW feedforward.

1. Is it best to configure the Feedforward table to just below the Target Aim Idle ?

the idle aim main is set to 1500 cold and 1250 warm so the feed forward table has 3 entries for rpm 1100 1250 and 1500

I have set this at running temps to be as close as possible but it fluctuates around the target - is this normal for dbw and Big CAMS.

2. what do configure next - the idle ignition timing limit advance control proportional and integral gain ??
or
Idle Mass flow Integral and proportional gain (I before P in the help)

Now i have played with the idle ignition timing limit advance control and got the idle close to idle aim main and its good.

If i blip the throttle i get hugh oscillation to stall with 0 entries are in the Idle Mass flow gains and no matter what setting i use it never goes away. so I at 160 and P and 0 as a start as per the help.

Any help would be good.

Hi,

Can you send the logging from this to support @ motec.com.au and I'll have a look at it for you.

Usually if the FF table is correct, there is minimal amounts of P & I needed (most vehicles that I have done just use the base settings).

The FF table usually has a larger number of cells in it than you have described.

Idle Aim


Ramp rate

Feed Forward


More than 3 cells

I will send over the config and log file shortly