Very strange situation with MAFT PRO. We don't know what is it.

[Archon]

Hello.

Supra 89+.
550cc RC
Fuel pump mk4 USDM
Aeromotive FPR
Wideband AEM uego
2.5' pipes with spearco replica
3' Downpipe and exhaust

We have MAFT PRO with MAP sensor and Air Temp Sensor, and boost control kit.
Instalation complete.
All sensors are OK. Fuel presure in FPR = 2.8.

Today I have input settings from here: http://www.supramania.com/forums/showthread.php?t=11783&highlight=maft
Other settings:

PROBLEM:
I can get AFR = 14.1 only if I make Mainscale = approximately 50


I don't know what I can do now.....


Can you help?

Realy sorry for bad english.

 

[GrimJack]

FPR = 2.8? What units? That can't be PSI.

Mainscale - is that negative 50 or positive 50?

The AFR, is this at idle, cruise, or what?

 

[americanjebus]

is that 2.8 in Bar? in that case you need to bring it down to 2.0 - 2.1 bar.

From there reset your mainscale to zero and go from there. Whats your vf reading?

just wondering if in your initial settings you have the right wideband entered and all that, if you post up a saved bin file one of us can just look over it to see if the initial settings are right. Have you just gotten these values at idle or driving like grim said?

 

[Archon]

yes, 2.8 bar on my FPR Aeromotive. At idle.

Mainscale - is positive 50. That is why I think something wrong.

I have not try to go. Only stay and only idling. Maximum 1200-1500 RPM.

I'll try to make file and upload here. I need laptop and Tuner PRO?

 

[boosted2085]

yes youll need tunerpro and laptop or a really long serial cable to your desktop...did you make sure your wires are wired right?...because if you went by that diagram it doesnt tell you to cut the brown wire from the maft pro to the ecu...for more clarification heres some links youll need if you dont have em already

www.fullthrottletech.com or www.turboninjas.com/supra/maft/

 

[Archon]

because if you went by that diagram it doesnt tell you to cut the brown wire from the maft pro to the ecu...

Sorry, I can not understand what you mean. My brown wire from Maftpro conected to "THA" on ECU. Is it wrong? I'we conect all wires like in Maftpro documentation.

 

[boosted2085]

Yes the brown wire that goes to the tha wire on the ecu,clip it,if not it throws a code...have you checked for codes?

 

[Archon]

My wiring:

 

[boosted2085]

i have my wideband and purple wire connected to the e1 (computer ground) instead of e2(sensor ground)....you still need to disconnect the brown "tha" wire..

 

[Archon]

Why I need to cut Brown?
In Maftpro documentation it is not cut.

I have try now disconect brown. Afr come a little rich than earlier.

 

[boosted2085]

it is inside the afm.also i forgot you need to put a 1.2k resistor between THA wire and E2 wire.after that then set your mainscale to -25 and see what you get...that wire diagram isnt updated..like i said before fullthrottletech and that turboninja website will give you alot of info

 

[boosted2085]

here you go..the little box on the 3rd pic is the resistor..and the purple wire from the maftpro and the wideband ground connected to e2 on the ecu

 

[Archon]

Thank you, men!

My Supra is 89+, need I use rezistor too?

On image it 2.2k. I need 2.2k or 1.2k?

And this brown wire I must disconnect from ECU?

I'll look websites later, when I come to computer. Now I am in garage, in internet from mobile phone

 

[boosted2085]

well the brown wire i cut it from where i soldered it to but i left an inch of the brown wire connected so connect the resistor between "tha" and "e2...well i put a 1.2 but i might go back and put the 2.2k...the hac resistor mod is only if your supra has a hac or if your in high altitude

 

[Archon]

I have try your way with resistor. Nothing new.

I have check injectors - all works.

What else I must do?

 

[boosted2085]

re-check your wiring...but if your running the mainscale at +50 thats way too much....but it is a headscratcher...see if turbo bob can help you out at fullthrottle tech

 

[Archon]

boosted2085
ok, thank you, I'll ask Bob.