VXCF4NG versus VXCF9NZ any thoughts?

[Power2336]

I just have my FICM replaced at my dealership this week under warranty and they re flashed my PCM to the VXCF9NZ strategy and was curious what the pros and or cons are or is it worth rolling back to the original VXC4 code? I run tunes from Matt and Vivian and spoke to Matt who said I should be able to run my original tunes even with the new strategy. He also mention that the new VXC9 code cycles the vanes at idle aswell as other features that are a plus. Sorry I dont have the other features on hand as I should have written them down. I did notice that after I set my truck to stock before taking to dealer and then picking it up that the truck in stock form with new CODE felt to me like a dog stuck in mud and no real acceleration compared to the previous stock tune. I also have been running the runes for a year or so now so also forgot how better the truck runs with the tunes in place. I did notice though with the new stock strategy that I got 2-3 mpg less going 70.

[cleatus12r]

The VXCF9xx stragegy of which you speak is the ECM code, not the FICM code. However, if Ford flashed your ECM to VXCF9xx, then your FICM also has a new strategy as well.

From the website:

"Unfortunately, this year also saw the release of Engine Control Module (ECM) and Fuel Injection Control Module (FICM) updates that limited power output of the engine and severely degraded fuel economy. Also, in an effort to reduce further issues on the '03 and '04 model years, the same power limiting calibrations were loaded into any vehicle that happened to wander into a Ford dealership for service. Often, these "updates" were applied without the knowledge (or approval) of the vehicle owners. Imagine the surprise of 6.0L owners everywhere who went in for a simple oil change and lost 3-5 MPG INSTANTLY!"

"Often, customers with later ECM strategies will not see the same results from a FICM Reflash that customers with earlier ECM strategies do. Ford dealerships do not have the capability to reprogram your ECM/TCM to an earlier, more desireable calibration; PHP, however, can! If your current calibration is VXCF7xx, VXCF9xx, VXAP2xx, or VXBC9xx, we strongly recommend that you request an ECM/TCM rollback in conjunction with your FICM reprogramming."

[Power2336]

The VXCF9xx stragegy of which you speak is the ECM code, not the FICM code. However, if Ford flashed your ECM to VXCF9xx, then your FICM also has a new strategy as well.

From the website:

"Unfortunately, this year also saw the release of Engine Control Module (ECM) and Fuel Injection Control Module (FICM) updates that limited power output of the engine and severely degraded fuel economy. Also, in an effort to reduce further issues on the '03 and '04 model years, the same power limiting calibrations were loaded into any vehicle that happened to wander into a Ford dealership for service. Often, these "updates" were applied without the knowledge (or approval) of the vehicle owners. Imagine the surprise of 6.0L owners everywhere who went in for a simple oil change and lost 3-5 MPG INSTANTLY!"

"Often, customers with later ECM strategies will not see the same results from a FICM Reflash that customers with earlier ECM strategies do. Ford dealerships do not have the capability to reprogram your ECM/TCM to an earlier, more desireable calibration; PHP, however, can! If your current calibration is VXCF7xx, VXCF9xx, VXAP2xx, or VXBC9xx, we strongly recommend that you request an ECM/TCM rollback in conjunction with your FICM reprogramming."
thats what I was afraid of that the dealer would not re flash to previous code. I have been told that even with the new VXC9 code on my ECM and now new FICM, that if I run custom tunes from people like MATT at GEARHEAD they can tweak their tunes so that they can regain the power loss and with that hopefully a few of the MPG depending on my right foot. I ran MATTs tunes before I got the new FICM and talked to him since. Does this hold any weight or is going threw PHP my only real option to get back what the DEALERs have stolen lol?

[Power Hungry]

We've run into a couple concerns with having an ECM programmed with a later strategy and then using a programmer with an earlier strategy. The few trucks we've tried it on have ended up disabled and needed to be recovered. I'm not sure if this is still the case, or if SCT has changed their firmware on the X3 to circumvent this problem.

Stock for stock, the earlier strategies are the best way to go. In most cases, running a tuned VXCF9xx strategy is going to offer a considerable improvement over stock, but our dyno tests have shown that the later strategies just don't seem to make the same power as the earlier strategies. My VXBC9 strategy on the hot tune makes just under 400 HP while the VXBC6 strategy makes 430 with the same tuning on the same maps.

Just something to think about...

Take care.

[Power2336]

We've run into a couple concerns with having an ECM programmed with a later strategy and then using a programmer with an earlier strategy. The few trucks we've tried it on have ended up disabled and needed to be recovered. I'm not sure if this is still the case, or if SCT has changed their firmware on the X3 to circumvent this problem.

Stock for stock, the earlier strategies are the best way to go. In most cases, running a tuned VXCF9xx strategy is going to offer a considerable improvement over stock, but our dyno tests have shown that the later strategies just don't seem to make the same power as the earlier strategies. My VXBC9 strategy on the hot tune makes just under 400 HP while the VXBC6 strategy makes 430 with the same tuning on the same maps.

Just something to think about...

Take care.
Thank you for the info. I have another queston for you.
Since I got my ECM flashed to the VXCF9 and a new FICM from FORD installed threw warranty but would like to get the roll back to the VXCF4 from you guys would I need to have the FICM reprogrammed as well to the same code or do they runindebendant when it comes to that scenerio or can I just do the ECM on its own then later on get a new FICM 58V threw swamps with your hybrid tuning when money permits?