Lean WOT

Anything about Ford EEC tuning. TwEECer and Moates questions dominate, but there's some SCT and OBD-II knowledge too.

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Foxbodyguy49
Gear Head
Posts: 6
Joined: Mon Apr 01, 2019 10:46 pm

Lean WOT

Post by Foxbodyguy49 » Fri Apr 26, 2019 11:48 am

My 91 mustang has a 302 with 30lb injectors and 75mm MaF and 190lph In take pump running a supercharger on 7lbs my wide band is not going rich on WOT it’s still staying around 14. But I’m commanding 11.5 at WOT what would be causing this lean WOT condition?
91 mustang
Eec-tuner chip
Eec-editor software
302ci, trickflow upper and lower intake,f303 camshaft,1.6rockers, 30lb injectors, 75mm MaF powerdyne BD11a running 7lbs

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cgrey8
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Re: Lean WOT

Post by cgrey8 » Fri Apr 26, 2019 12:06 pm

Here's some things to check just to cover all bases:
  • Verify the MAF isn't maxing out. If voltage is nearing 4.5v, it's maxing.
  • Verify the injector PWs are not near 100%
  • Verify fuel line pressure is being maintained while at boost. With only 7lbs, the fuel pump shouldn't have much trouble keeping up.
  • Verify the WOT KAMRFs are not commanding values that would offset your LAMBSE values. IMO, KAMRFs should be 1.00@WOT so they have no affect.
If all that checks out, then see if you can "force" the AFRs lower by bumping the high-end of the MAF curve up so the same voltages translate to higher kg/hr values, which would command more fuel. If that improves WOT AFRs, then keep adjusting until you are hitting LAMBSE target.
...Always Somethin'

89 Ranger Supercab, 331 w/GT40p heads, ported Explorer lower, Crane Powermax 2020 cam, 1.6RRs, FMS Explorer (GT40p) headers, Slot Style MAF, aftermarket T5 'Z-Spec', 8.8" rear w/3.27s, Powertrax Locker, Innovate LC-1, GUFB, Moates QuarterHorse tuned using BE&EA

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Foxbodyguy49
Gear Head
Posts: 6
Joined: Mon Apr 01, 2019 10:46 pm

Re: Lean WOT

Post by Foxbodyguy49 » Fri Apr 26, 2019 12:44 pm

Thanks yeah could it be possible my MaF is shot I’ve richened up the curve up to a ton and it still read lean on the wideband but it’s weird the car doesn’t hesitate or ping it runs prettt string thru boost. I have a 80mm ford MaF I’m gunna swap in and change the curve to match and see if that helps. It I actually unplugged the MaF and the car ran the same
91 mustang
Eec-tuner chip
Eec-editor software
302ci, trickflow upper and lower intake,f303 camshaft,1.6rockers, 30lb injectors, 75mm MaF powerdyne BD11a running 7lbs

Foxbodyguy49
Gear Head
Posts: 6
Joined: Mon Apr 01, 2019 10:46 pm

Re: Lean WOT

Post by Foxbodyguy49 » Sat Apr 27, 2019 7:48 pm

So I actually narrowed down the issue to the actual wideband itself. It’s a AEM 30-4110 I have the sensor in the driver side header where the o2 was and I disabled the hego for that side in my tune but the gauge reads perfect sometimes and then say I stop and turn the car off and go into the store when I come back and start the car the gauge reads 14.2 and stays there with no movement thru the drive home
91 mustang
Eec-tuner chip
Eec-editor software
302ci, trickflow upper and lower intake,f303 camshaft,1.6rockers, 30lb injectors, 75mm MaF powerdyne BD11a running 7lbs

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