map filter settings

[Seight-v8]

hello all,

can someone recommend a good setting for the "map filter" on a v8 engine.

At the moment i have

triggers num for map filter = 2

map samples per trigger = 10

got these from the help dialogue (V6 engine though)

cheers

scott

[mattias]

"Triggers num" are the number of cylinder events to get the samples from.
"Map samples per trigger" are the amount of samples between those events.

I would not use more than one revolution, V8 would mean "triggers num" = 4.
The default settings use about a half revolution, I would stick with that.

As long as the signal seems steady and not pulsating you should be fine.

[Seight-v8]

thanks,

Makes more sense now, and another thing off my list of things i dont understand...

I have about 2.5kpa oscillation in my map sensor readings at idle......is this ok...or does it need to be better?

but i have a piper 285 cam...and thought it might be lumpy on idle anyway.

what is classed as a "noisey map" reading?

scott

[mattias]

Noisy.. hard to say, one which wanders more than that and causes different fueling while really being in a steady state.
You have to determine that yourself, some things can't be fixed easily.

Do what you can with the map filter settings, you can also try mechanically damping as a final method. Either a small gasoline filter in-line, or a 1 mm MIG welding piece as a restriction.