After a header swap. When at closed throttle and you tip in the fueling is correct. When the throttle steadies the afr will go lean in the 16s for 5-10 sec and then back to where is should be. This is in open loop also any ideas I am stumped? I have messed with the accel enrichment tables with no luck.

This only happens on low part throttle. Hard accel is fine.

Mat

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89 mustang on e85 with a9l computer. R block 347 9. to 1,procharger D1 3 core intercooler 11 psi@6k, rhs 200, fti cam, holley systemax, Accufab mid lenghts, x with no cats, smog removed, 75 mm tb, pms 3in blowthru maf, 120 lbs injectors, lentech AOD, non lock up 3000 stall, 3.55 gear, ram charger fan, 130 amp alt, duel feed walbro 255 fuel system. I am using BE and EA

Also a hard accel from close throttle will cause a huge bog and the car wll go lean 20-1. If I do the same with the throttle cracked it is perfect afr and zero bog....

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89 mustang on e85 with a9l computer. R block 347 9. to 1,procharger D1 3 core intercooler 11 psi@6k, rhs 200, fti cam, holley systemax, Accufab mid lenghts, x with no cats, smog removed, 75 mm tb, pms 3in blowthru maf, 120 lbs injectors, lentech AOD, non lock up 3000 stall, 3.55 gear, ram charger fan, 130 amp alt, duel feed walbro 255 fuel system. I am using BE and EA

Did you adjust the injector slopes for the change to E-85 or add the fuel through the MAF?

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STLMustangs
Dealer and Tuning Support for DiabloSport,TwEECer, Moates, SCT & HPTuners

slopes

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89 mustang on e85 with a9l computer. R block 347 9. to 1,procharger D1 3 core intercooler 11 psi@6k, rhs 200, fti cam, holley systemax, Accufab mid lenghts, x with no cats, smog removed, 75 mm tb, pms 3in blowthru maf, 120 lbs injectors, lentech AOD, non lock up 3000 stall, 3.55 gear, ram charger fan, 130 amp alt, duel feed walbro 255 fuel system. I am using BE and EA

why mess with the adaptive update rate if your in forced open loop?

sounds to me like your tipping in rich the o2s are yanking fuel and they're ramped too far lean once your accel pump stops and you lean out, but in order for that to happen you have to be in closed loop

else could possibly be turbulence issue in the maf, try throwing a screen on it

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http://www.efidynotuning.com/ford/

I ment to say accel enrichment tables. I edited first post to avoid confusion.

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89 mustang on e85 with a9l computer. R block 347 9. to 1,procharger D1 3 core intercooler 11 psi@6k, rhs 200, fti cam, holley systemax, Accufab mid lenghts, x with no cats, smog removed, 75 mm tb, pms 3in blowthru maf, 120 lbs injectors, lentech AOD, non lock up 3000 stall, 3.55 gear, ram charger fan, 130 amp alt, duel feed walbro 255 fuel system. I am using BE and EA

I have been editing the Fuel - Transient Equilib Intake Surface table in the low load range and the tip in problem is improving. Need to fine tune the maf curve and the Transient Equilib Intake Surface some more and I will report back.

Mat

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89 mustang on e85 with a9l computer. R block 347 9. to 1,procharger D1 3 core intercooler 11 psi@6k, rhs 200, fti cam, holley systemax, Accufab mid lenghts, x with no cats, smog removed, 75 mm tb, pms 3in blowthru maf, 120 lbs injectors, lentech AOD, non lock up 3000 stall, 3.55 gear, ram charger fan, 130 amp alt, duel feed walbro 255 fuel system. I am using BE and EA

you can't dial in transients until you got your fuel dialed in

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http://www.efidynotuning.com/ford/

The maf curve is very very close I just need to verify it in some steady cruising then finish the trans tuning.

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89 mustang on e85 with a9l computer. R block 347 9. to 1,procharger D1 3 core intercooler 11 psi@6k, rhs 200, fti cam, holley systemax, Accufab mid lenghts, x with no cats, smog removed, 75 mm tb, pms 3in blowthru maf, 120 lbs injectors, lentech AOD, non lock up 3000 stall, 3.55 gear, ram charger fan, 130 amp alt, duel feed walbro 255 fuel system. I am using BE and EA

I have been working on the tip in. On WOT hard tip in the car will still bog as it runs out of fuel. I am out of ideas... It acts fine if you ease in to the gas but a quick snap will lead to a bog.

Here is a short datalog with the bog happening twice. I also included a copy of the tune.

http://www.mediafire.com/?dvoi4uymk066fyk < tune

http://www.mediafire.com/?9teexuqpeenc1fu < datalog

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89 mustang on e85 with a9l computer. R block 347 9. to 1,procharger D1 3 core intercooler 11 psi@6k, rhs 200, fti cam, holley systemax, Accufab mid lenghts, x with no cats, smog removed, 75 mm tb, pms 3in blowthru maf, 120 lbs injectors, lentech AOD, non lock up 3000 stall, 3.55 gear, ram charger fan, 130 amp alt, duel feed walbro 255 fuel system. I am using BE and EA