so has anyone figured out the FCD in MAFT?

hottscennessey

hottscennessey

DONT BE A BITCH!
Jun 3, 2005
3,137
0
36
37
Richmond, VA
I was just wondering if anyone has figured out how to use the fuel cut defenser that is built into the maft. I'm trying to tune my car but i'm still running into fuel cut. My A/F's looks 10x better than they did with the lexus AFM, but i cant get past it. Additional information, if needed, I have 550's sp61gt @ 15psi, i'm in blow through, all settings are zeroed out on the maft and i'm using a SAFC to correct fuel.


and i have another question, i know the A/F's at idle should be around 14.7, but where should they be at 10 vac, and 0 vac. also why do i get a lean spike at 2500 rpms, and then it drops down to rich at 2800?
 
hottscennessey

hottscennessey

DONT BE A BITCH!
Jun 3, 2005
3,137
0
36
37
Richmond, VA
hmm i'm still not quite clear on a few things, instead of making a new thread i'm just going to post here.

what do the different hz signify? what is the difference between the Hz i clamp, is one setting safer than the other?


and as to do with tuning, at what point in my boost should the fuel curve down to a 10 or 11 A/f? once i enter and ammount of boost?
 
IHI-RHC7

IHI-RHC7

"The Boss"
Apr 1, 2005
1,310
0
0
40
Oregon
It should be a smooth transition, as you aproach zero boost, the ecu is pulling timing, and adding fuel, so full vac should be 14.7, zero psi should be around 13 or so, and anything above 8 psi IMHO should be 11.8 or so.
I'd stay away from anything richer than 11.5.
Also, I'd tune the AFR by leaning out the mixture with fuel pressure, and adding fuel with the maft down low to compensate, that way you aren't increasing timing by pulling fuel with the kf numbers.
 
You must log in or register to reply here.
Top Bottom