why is it pegged all the way lean at WOT???

[MZ ZOOM]

my first thought was maybe i had the wrong plugs in there, so i just changed them out with the zfr7f-11's and still the same...as soon as i go to WOT in any gear the a/f goes all the way lean and i cant understand what is causing it to do this??? anyone have any suggestions??

I have a similar problem with my car too, when i go WOT my car seems to go to a certain point then it feels like it's loosing fuel pressure and it boggs ...but if i drive at normal conditions it will drive fine, only when i peg it then it doesnt really want to go. i have a 3 inch catless Apexr1 downpipe back, and a perrin FMIC, and i run stock boost. and also and a boost guage and a A/F guage hook up...i can also here pinging through my exhuast sometimes when it goes WOT ,does anyone here knows why it does that??? is it time for me to upgrade the fuel system? or add a fuel managment system to my car?

 

[mzdfc3s]

well i give up, im just going to run the b**** into the ground...(burnout)

 

[msfamilia]

I have a similar problem with my car too, when i go WOT my car seems to go to a certain point then it feels like it's loosing fuel pressure and it boggs ...but if i drive at normal conditions it will drive fine, only when i peg it then it doesnt really want to go. i have a 3 inch catless Apexr1 downpipe back, and a perrin FMIC, and i run stock boost. and also and a boost guage and a A/F guage hook up...i can also here pinging through my exhuast sometimes when it goes WOT ,does anyone here knows why it does that??? is it time for me to upgrade the fuel system? or add a fuel managment system to my car?

It just sounds like you are experiencing the "infamous" heistation caused by a rich mixture map on the factory ECU.

 

[mzdfc3s]

i thin khe maybe but its def not what i have...

 

[MZ ZOOM]

It just sounds like you are experiencing the "infamous" heistation caused by a rich mixture map on the factory ECU.

Hmmmm...but i had my cars ecu reprogramed at the dealer when it was bone stock and heistating? the heistation went away. it only started doing this heistationg again after I installed all the aftermarket parts?

 

[ND4MSP]

I had my car flashed also a while back also. I'm runs ok, but still nowhere near it should.IMO I still feel a hesitation.

 

[smo0f]

my ecu dumps a shitload of fuel at WOT/4k+ rpm. doesnt matter what psi. like 10.0 or less afr's