Any advantages/disadvantages?

Have noticed that it has been toyed/played with on some tuners chips(not hypergarbage either)... Not quite sure of the reasoning

BLM change rate was almost instantaneous.......


Would updating the blm rate cause a larger discrepancy from blm to int?

Just curious looking for all the edges to get this latest series of chip revisions as nice as possible and then scrap it and rebuild another :-)

 

Set it fast enough, and it just chases the INT.
Which on a hot street engine might be a good thing, thou.
Then again, on the C3 ecms, it might also be a good thing.

Maybe something to play with and/or just remember it's another strategy available to play with.

 

I don't believe that it is a good thing (to increase the rate of change). In the PID loop of things the BLM is really an offset value. It is like an INTegrator but for a longer term. In the grand scheme the BLM is used more for CCP trim then anything else.

In the long term divability issue it can come into play such as when a fuel pump is going south, or another sensor like the MAF/MAP/MAT/IAT/CTS isn't reading correctly (going bad). The O2 sensor still needs to be correct though.

The aftermarket is probably making it update quicker in order to cover their tuning errors. Not a good thing to do. As many folks move the O2 further down the pipe (headers) a faster update rate can cause oscillations in the INTegrator along with the proportional gains.

The way to go for tuning a VE table is to lock things up, attach a WB, drive around and data-log, then run it through something like VEMaster.

RBob.