2014 Mustang GT Cammed EBT Drops to 280 and hits a wall WOT

[Robert00MustangTurbo]

Hello, I am struggling to get this vehicle to stay wide open and wondering if I'm missing something.

2014 Mustang GT
PMAS CAI
Ported Cobra Jet
VMP Twin 67mm
Todd Warren Cams 240/242
Degreed to 108/112
Long Tube Headers
E85


In the log during WOT, you can see the EBT drop from 390ftlbs to 280ftlbs and stay there for the remainder of the time with no directions from the source pids.
Screenshot (114).pngScreenshot (110).png


This is the first cammed car I've experience with this as other cars with even bigger cams (252/254) I did not experience this issue.

Did I miss something? Is the throttle body data that is entered causing this? Torque tables? DD table?

Thank you in advance.

EBT drops to 280s and hits a wall..hpl
2014 Mustang Patch applied Todd Warren Cams LU47 Cobra Jet VMP 67mm e85 R12.hpt

[murfie]

Too many things being logged at once.

Spark looks like its constant
Fuel from atleast one bank looks like it was good.
None of the MAF, calculated MAP, load, or throttle PIDs are coming through quick enough to see anything.

VMP sells those with the electronics for the Gt500's. These are the four places I would start with coping from one of those files.

R00MT vs 14 GT500.jpg

I also don't see why you raised your calculated MAP max on an NA car, shouldn't need to do that if you don't have MAF transfer error.

[Robert00MustangTurbo]

I reduced the amount of pids logged. Also the WOT Box was removed to eliminate a potential interference.


The car pulls hard up until 5900-6100rpms then it falls on it's face. Throttle blade is still open, WOT fueling is there and WOT spark is there, so I believe the camshafts themselves are the issue at play here, like the grind wasn't on the proper center line.


Screenshot (117).png
Screenshot (118).png



EBT drops to 280s WOT BOX Removed (1).hpl
2014 Mustang Patch applied Todd Warren Cams LU47 Cobra Jet VMP 67mm e85 R14 2 (1).hpt

[murfie]

Airflow falling of a cliff suddenly seems more like valve float.
If it was cam profile I would expect it to be more gradual.

[Robert00MustangTurbo]

Airflow falling of a cliff suddenly seems more like valve float.
If it was cam profile I would expect it to be more gradual.

Even though I didn't hear valve floating, that definitely makes more sense than cam profile, like valve spring stability issues. Literally feels like you hit a wall at that RPM.

[iceman321]

Even though I didn't hear valve floating, that definitely makes more sense than cam profile, like valve spring stability issues. Literally feels like you hit a wall at that RPM.

any luck yet? I have not tuned gen 1 but on gen 3s the driver demand table has to be raised or the power will cut off hard, yours looks like it needs to be adjusted. I would also leave cylinder air anticipation off while dialing in the car. Another thing I don't think the parameters are being logged at an appropriate rate and your lambda in the .7xx range can cross into open loop unless you adjust the lower limit for closed loop fueling.

[Robert00MustangTurbo]

We got the issue fixed!

So thinking we have a cam/valve spring issue, the stock cams and valve springs were put back to stock. The issue still was there!! Looking deeply through the log, the MAF Lbs/Min caught my attention and notice it would not go past the 39lbs/min mark. Even MAF ultra seconds would not go lower than 130's.

321986425_401356512174337_6383875865977500446_n.png



Sitting here thinking, "is the PMAS really the issue due to the size, the MAF placement and the intake tube being a LOG????"

320119668_484111783648672_7907131520884304661_n (1).jpg


So, last thing to try before throwing in the towel was to switch out the PMAS CAI with a JLT CAI (Known good CAI to me as it has never failed me and has good MAF placement)

317744028_531782852227266_2308203273644358246_n (1).jpg


Retested car and WHAT DO YOU KNOW, THE ISSUE STOPPED AND WE GOT A FULL PULL OUT OF IT!

Screenshot (124).png



I'm just in disbelief a Cold air intake would cause such an issue.

Time to finish this tune and send her on home with the stock cams for now.

I appreciate everyone's input.

Attached are the logs for comparison

PMAS MAF Drop Log.hpl
JLT CAI Fixed it!.hpl