2011 SOHC Ping/spark knock on 87

[Uncle Gump]

I just have this image of farm truck and azn tuning the moredoor nova...

 

[gw33gp]

So, a few more things, and since I get tired of talking to my cat, I'm going to talk in your general direction.

Here is a data log I made during a highway merge. The shift is a 4-5 upshift when the PROFESSIONAL DRIVER ON A CLOSED COURSE shifted to finish the merge. The stock tuning on the 4.0l SOHC basically commands 1.00 lambda (14.7:1) at all times while driving in closed loop. When WOT condition is met, the truck dumps from closed loop into open loop, drops all spark, and lowers lambda to 0.87 (12.8:1) and kills spark back to below base timing. And because its in Open Loop, you're stuck with an overly sheepish spark curve.

So, in essence, Ford intentionally made it run like shit when you grab for WOT.

There *is* power loss because Ford programmed it that way. 12.7 AFR and below base timing = poop. POOP. ITS POOP, FORD, CAN YOU HEAR ME? POOP!

I was just thinking I have not experienced my 4.0 SOHC running like crap at WOT. It pulls strong right up to redline. Then I remembered I have a custom flash tune, and it probably has better mapping. It has been a long time since I have done WOT on the stock tune, so I can't say for sure if I have or have not experienced lack of power at WOT, but I don't recall losing power at WOT with the stock tune.

 

[PetroleumJunkie412]

I was just thinking I have not experienced my 4.0 SOHC running like crap at WOT. It pulls strong right up to redline. Then I remembered I have a custom flash tune, and it probably has better mapping. It has been a long time since I have done WOT on the stock tune, so I can't say for sure if I have or have not experienced lack of power at WOT, but I don't recall losing power at WOT with the stock tune.

So what are the odds I can get a look at your maps?

 

[MetallicRedPrincess08]

Brother my 08 SOHC with the 3.5psi blower kit currently loves 87 octane.
She does have a catch can, with an adequate PCV system. And an EGR delete. Not the kind with some sort of tune. The one where the intake and manifold are adequately plugged, and you place the vaccum nipple for the egr valve on the upstream side of the DPFE. Yknow, the one that sets no codes.

I also use the stock airbox, with the stock air charge temp sensor location(MAF). I have a 3 inch steel pipe shoved through the plastic air dam in the rad support, clamped to a 3in OD piece of hose I shoved into the airbox lower opening, which somehow created an airtight seal.

I use the stock fan & clutch

Practical experience tells me that 87 octane is perfectly fine for 3.5psi. Me being myself though, I almost never hit WOT with my truck. As weird as this may sound, my truck ran like shit on 87 octane with a functioning egr system and the original 02 sensors, sensors which were good enough not to set any codes... but sensors I know were responsible for making the engine try and tear itself off the motor mounts when id pop the throttle plate partially open.

Do I really HAVE to tune it? It never pings. Doesn't shake at idle. It runs nicer than any other vehicle I have ever driven... I'm not exaggerating, its just the honest truth which has totally subverted the expectations I initially had when I decided to supercharge my truck.

So like... should I really tune it to run 87? It runs great. The last thing I would ever consider doing is putting an aftermarket MAF on my truck...