I have a question about the timing maps in the low RPM ranges (say from the zero to 750 range).

Since the engine will never (well almost) see any RPM's that low I would like to know what anyone thinks these areas of the maps has to do with the overall smoothness and driveability of the car?

I have had two different tunes for my car and have been making adjustments to eliminate knock and make the car feel smoother in everyday driving.

I have been using the DLL software for analysis and just made up a Excel spreadsheet that will overlay the stock timing values compared to the current tune.

I am just wondering what everyone's opinion is on how these low RPM maps might affect how the car drives or is it something that is only used during deceleration or even for emissions .

Thanks in advance,
Bob

I have attached the graphs of the 500 and 750 timining comparisions.

 

let us know what you find

 

Will do, seems weird but I'm sure those maps do something

 

it would be interesting to know if there is a play in the ecu so that it can look forward a number of cells to find what it needs. Lets say under certain circumstances it averages over a distant set of cells instead of the current and next.
my bet is that the engineer wanted to make the car run so crappy no driver would try to run there.

personally I can't understand the negative timing cells and have replaced them with a more practicable number. (once an old dog learns...) in a similar fashion some of the odd fuel swings have been removed.