running single O2 sensor on turbo mustang?

Vehicle specific forum for tuning the Foxbody Chassis Mustangs utilizing the LUX0, GUFA, GUFB, and GUF1 Strategy

running single O2 sensor on turbo mustang?

Unread postby TurboNotch74 » Sat Oct 18, 2014 12:23 am

First post and love the site and great info. I have some questions but I'll knock them out individually.

I was thinking of only running one O2 sensor on my mustang to keep the wiring and the amount of O2 sensors/bungs in the down pipe simple. I just wasn't sure if I should keep it stock with 2 sensors for any reason. Also where do you modify that in the a9l file in BE2012? Any thoughts or feedback would be great.
91 mustang, stock shortblock, f-303 cam, t/f t/w heads, holley intake, 8* timing, 42# injectors, 76mm c&l maf, a9l computer, aod, 255 intank, inline pump, 3.27 rear gear, & 70mm (9psi) intercooled turbo kit.... working on QH or f3 chip with BE.
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Vehicle Information: 91 mustang, stock shortblock, f-303 cam, t/f t/w heads, holley intake, 8* timing, 42# injectors, 76mm c&l maf, a9l computer, aod, 255 intank, inline pump, 3.27 rear gear, & 70mm (9psi) intercooled turbo kit.... working on QH or f3 chip with BE.

Re: running single O2 sensor on turbo mustang?

Unread postby decipha » Sat Oct 18, 2014 6:33 am

welcome to the forum Jeff

you can disable the driver hego by setting NUMEGO to 1 and the injector output port table FN1327 to all bank 1 (for cyl 5,6,7,8)

no problems at all, in fact I do it on all my turbo and x-pipe tunes
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Re: running single O2 sensor on turbo mustang?

Unread postby TurboNotch74 » Sat Oct 18, 2014 9:34 am

Thank you very much Decipha and thanks for the welcome also! That was exactly the info I was looking for. You guys got a nice forum here and I wish I would have started doing some eec tuning years ago. ;)
91 mustang, stock shortblock, f-303 cam, t/f t/w heads, holley intake, 8* timing, 42# injectors, 76mm c&l maf, a9l computer, aod, 255 intank, inline pump, 3.27 rear gear, & 70mm (9psi) intercooled turbo kit.... working on QH or f3 chip with BE.
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Vehicle Information: 91 mustang, stock shortblock, f-303 cam, t/f t/w heads, holley intake, 8* timing, 42# injectors, 76mm c&l maf, a9l computer, aod, 255 intank, inline pump, 3.27 rear gear, & 70mm (9psi) intercooled turbo kit.... working on QH or f3 chip with BE.

Re: running single O2 sensor on turbo mustang?

Unread postby decipha » Sat Oct 18, 2014 6:48 pm

its never too late, the best advice i can give you is to jump in and start playing with your tune
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: running single O2 sensor on turbo mustang?

Unread postby jeff7577 » Tue Aug 21, 2018 12:36 pm

decipha wrote:welcome to the forum Jeff

you can disable the driver hego by setting NUMEGO to 1 and the injector output port table FN1327 to all bank 1 (for cyl 5,6,7,8)

no problems at all, in fact I do it on all my turbo and x-pipe tunes


Sorry to bump such an old post but it is relevant to what I am currently working on. Wouldn't this force the EEC to use the passenger side only(bank 1), disabling the drivers sensor?
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Re: running single O2 sensor on turbo mustang?

Unread postby decipha » Tue Aug 21, 2018 5:34 pm

yep thats what i meant i typed it backwards though

you can disable hego2 which is the driver side hego leaving hego1 the passenger hego operational
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
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00 Explorer 5L - Bernyce

Re: running single O2 sensor on turbo mustang?

Unread postby 89fast5oh » Thu Aug 23, 2018 8:45 pm

If the hego2 is disabled but the sensor is left in place, will the it get fouled and ruined over time from the exhaust gases?
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Re: running single O2 sensor on turbo mustang?

Unread postby decipha » Thu Aug 23, 2018 10:30 pm

no, the ecu just ignores the input when you disable it. The hego heater is fed 12v power from the ignition switch same as all the ignition feeds.
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90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: running single O2 sensor on turbo mustang?

Unread postby 89fast5oh » Fri Aug 24, 2018 3:54 pm

decipha wrote:no, the ecu just ignores the input when you disable it. The hego heater is fed 12v power from the ignition switch same as all the ignition feeds.


Gotcha.
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Re: running single O2 sensor on turbo mustang?

Unread postby jeff7577 » Tue Sep 04, 2018 3:23 pm

So i'm attempting to run a single O2 sensor and when I set numego to 1 and the injector output ports to all 2's it won't fire, although I smell fuel. Thoughts? It seems this does more than simply assign injectors to a specific banks sensors?
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Re: running single O2 sensor on turbo mustang?

Unread postby decipha » Tue Sep 04, 2018 5:26 pm

u cant set numego to 1 then set all the injectors to an invalid port and expect it to run

read the tips write up on the homepage to set it up correctly
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Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: running single O2 sensor on turbo mustang?

Unread postby jeff7577 » Wed Sep 05, 2018 7:43 am

decipha wrote:u cant set numego to 1 then set all the injectors to an invalid port and expect it to run

read the tips write up on the homepage to set it up correctly


I read the gufb document. I incorrectly assumed that either bank could be used.

"NOTE that if NUMEGO = 1 (mono-EGO), all values in
FN1327 must be zero (corresponding to FUELPW1), or no fuel will be sent to
Bank 2."

BE uses Bank 1/2 instead of 0 or 1. The port is only invalid because the EEC is limited to that functionality.
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Re: running single O2 sensor on turbo mustang?

Unread postby decipha » Wed Sep 05, 2018 1:21 pm

BE is showing you 1 or 2, the actual values are 0 and 2, some people use 0 and 2, 1 and 2, or 0 and 1 depending on whos strategy file your using
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Location: New Orleans, LA
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Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce


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