Fuel Cut Defender For 7mgte ????

suprra_girl · 03-01-2006, 10:35 PM

fuel cut all happens in the air flow meter

the airflow is changed to a frequency of hz
when the frequency hits about 1500hz fuel cut is introduced
so basically when a certain amount of airflow comes thru the afm tells the ecu and the ecu spits the dummy and throws on fuel cut

the only way to stop the ecu from laying on fuel cut is to trick it by telling the ecu there is less air getting in (i.e fuel cut defencer)

fcd's clamp the signal at about 13-1400hz and the ecu never knows how much air is really in there
which is why you have to be really really sure you have the fuel available to compensate what the ecu doesn't see

example
lexus and 550cc injectors

you put on a lexus afm and now your car is getting 25% more air but the ecu doesn't know it is... it sneaks in thru the side chamber
the stock ecu is still delivering fuel for the air it can only see thru the main chamber.... suddenly you are 25% short on fuel.... if you go wot on this you may very well damage your engine
so to fix this fueling problem you add 550cc injectors and it's all evened out again

also there is no fuel cut as the ecu doesn't see the 1400 or 1500hz ever again (till 25psi or so) as the extra air is sneaking thru the side (so it's another fcd of sorts)

lemme know if this needs further explaining

03-01-2006, 10:35 PM	#8
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	fuel cut all happens in the air flow meter the airflow is changed to a frequency of hz when the frequency hits about 1500hz fuel cut is introduced so basically when a certain amount of airflow comes thru the afm tells the ecu and the ecu spits the dummy and throws on fuel cut the only way to stop the ecu from laying on fuel cut is to trick it by telling the ecu there is less air getting in (i.e fuel cut defencer) fcd's clamp the signal at about 13-1400hz and the ecu never knows how much air is really in there which is why you have to be really really sure you have the fuel available to compensate what the ecu doesn't see example lexus and 550cc injectors you put on a lexus afm and now your car is getting 25% more air but the ecu doesn't know it is... it sneaks in thru the side chamber the stock ecu is still delivering fuel for the air it can only see thru the main chamber.... suddenly you are 25% short on fuel.... if you go wot on this you may very well damage your engine so to fix this fueling problem you add 550cc injectors and it's all evened out again also there is no fuel cut as the ecu doesn't see the 1400 or 1500hz ever again (till 25psi or so) as the extra air is sneaking thru the side (so it's another fcd of sorts) lemme know if this needs further explaining __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!