EFIDynoTuning Forum

What will cause the Fuel source to switch from 5 to 3 (Cylinder cutout-Stabilized - STFT controlled by torque control feature) during shift from 3rd to 4th gear at WOT which cause the AFR to go lean?

torque modulation or torque truncation

Ok why this happened?

The car run fine all the time with good datalog monitoring. Only this time accured after multiple abuse with hard shifting 3rd to 4th continously. Can a fuel pumps about to fail cause this to happen as fuel prssure get dropped at high rpm? As i can see the Inj pulse width B1 and B2 get dropped from 4500 to 2300 and car get spike lean with fuel cutout and engine shutting down.

Only you as the tuner can tell us why. Must be something you have setup to do as I've never encountered this problem before.

Ok Decipha fair enough. So, getting back to my main question is why Fuel source will go to #3 which is "Cylinder cutout-Stabilized - STFT controlled by torque control feature", and if i understand you right that this is something to do with (torque modulation or torque truncation). Therefore, I haven't touched those tables at all. So, do I have to do something with them or leave them as it is?

if its hitting them then you need to move them out the way if you don't want to hit them

How to tell if i already hit them? which parameter will monitor them?
do i have to just raise the numbers by 10-20% and call it done and see how it will act? or this is wrong

I dont know I've never hit them before.

What is the full vehicle details?

New Edge Mustang 4.6 2v Supercharged with FBOs.
Mods: MMR Shortblock 900, DSS racing pistons with Manley H beam rods, 03-04 cobra crank shaft, compression ratio 9.7, F1-A procharger with smaller pulley at 20 psi, Edelbrock Jr Intake with 6061 pleanum and 75mm TB, Return Fuel system Division X dual pumps, MHS stage 3 heads with custom stage 4 blower camshaft to 7200 rpm, stainless works LT headers with x pipe and catback, 3.55 gears, Snow performance stage 2.5 water/methanol injection 50/50

Tune for MS-109 and methanol with 21 degrees of timing and tune for pump gas with methanol at 17 degrees of timing. RPM Red line at 6900. NGK BR7Es gapped at 0.023