Author Topic: map filter settings  (Read 6113 times)

Offline Seight-v8

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map filter settings
« on: June 11, 2010, 04:23:24 pm »
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
Engine:Rover V8 4600cc
Vems Firmware:V1.2.38, GPS, SDcard, LCD & Dual lambdas, Wasted spark, 36-1 trigger, Cam Sync & Bluetooth serial.

http://www.vems.hu/wiki/index.php?page=MembersPage%2FScottRichmond

Offline mattias

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Re: map filter settings
« Reply #1 on: June 11, 2010, 05:16:22 pm »
"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.

Offline Seight-v8

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Re: map filter settings
« Reply #2 on: June 12, 2010, 06:51:17 am »
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

Engine:Rover V8 4600cc
Vems Firmware:V1.2.38, GPS, SDcard, LCD & Dual lambdas, Wasted spark, 36-1 trigger, Cam Sync & Bluetooth serial.

http://www.vems.hu/wiki/index.php?page=MembersPage%2FScottRichmond

Offline mattias

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Re: map filter settings
« Reply #3 on: June 13, 2010, 02:46:44 pm »
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.