7Mgte Tuning

[aheroicrevolt]

7mgte
-550's
-Walbro
-Lexus AFM
-ebay offbrand AFPR
-FFIM with idle air valve
-90mm throttlebody
-tps adapter
-hx40 t4 turbo

Apexi SAFC2

I was told that the 550's and lexus AFM offset eachother so theres no tuning involved. That i should be able to set Apexi at 0% and run a little rich.
However in order to get my wideband where i want it (most of the time) i am at +20% across the map
The ECU is fighting the Apexi HARD. The wideband is all over the scale. One second rich then lean then rich. I drove home the other night fouling out spark at 8.8 on wideband. While the night before i was struggling to keep it under 17 while cruising....
Any ideas what could be happening?

 

[MichiganLC]

What's your idle fuel pressure at, with and without vacuum?

What's your ECU doing at idle? Does it think it's correcting rich, lean? Do you know how to check this?

20% correction is not unusual with 550s/lex mod.


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[aheroicrevolt]

Fuel pressure is set to stock levels. Checked that yesterday. I dont remember both numbers, but i know one is 38lbs (with or without vacuum i dont remember). I do not know how to read what my ECU is doing at idle. Usually I idle around 15 on wideband..which is a bit lean even at 20%...but adding more % does not effect it. but latley ive been idling around 17-18-19, if im driving its about 16. Ill shut the car off and when i start it up ill be idling at 8-9 and as soon as i try to drive im dead rich and stumbling/backfiring all over the place.
I say they are fighting eachother because i will be running rich at idle and ill adjust the % down way down and for a few short seconds i can watch my AFR's climb up into 11-12-13 but then something happens and it just like switches back to rich....or vice versa if i happen to be leaning out when i adjust it

 

[MichiganLC]

Are you tuning below 69% throttle?


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[aheroicrevolt]

Yeah, real light gas. On the highway cruising i use like...2% 3% throttle to keep it at 65mph, is that the problem?
I have the SAFC set to 30 low 70 HIGH
At 70% throttle ill just be constantly accelerating tho, not sitting at certain rpm intervals long enough to change fuel percentages?

 

[MichiganLC]

You should let TCCS control everything below 70% throttle. Otherwise you're always fighting it.

Diagnostics port has a Vf in it. When your car is warm and idling it will give you a voltage output telling you if your ECU thinks the engine is running rich, lean, perfect or somewhere in between. Use your fuel pressure and lex adj screw to balance this.


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[aheroicrevolt]

So idling and cruising and everything should be controlled by the onboard computers,
So my Safc low throttle map should just be 0's? And my high throttle map should be where i make adjustments?
Is my setting of 30/70 low high good?

 

[aheroicrevolt]

Bump