[Jackpine]

Originally Posted by redshirt63

Good Afternoon to all,

I have been on other forums seeking guidance and gotten kicked around pretty good. It seems all those members like to do is talk smack & run down other peoples stuff. That does'nt appear to happen here. But just in case, please be gentle with me.

I have a 2008 F-150 5.4 crew cab with an AEM brute Force CAI (I know, brute force, what a joke), Edge Evo with canned tunes, Gibson cat back exhaust, Pro-Comp lift with 35" tires, 4.56 gears.

The problem: With the Evo set for tow (stage 2) and all perameters set to match up grades, the truck cuts out at approximately 70 to 74 mph. If I get off the gas and roll back into it, it cuts out. Once I get through that window, the truck runs great. No codes.

Set the Evo back to Transmission (stage 1), all perameters set to match upgrades, truck runs like a champ!! The natorious lean condition, right? (and the call me dense).

Finally, my question. I have read that PHP has dyno'ed CAI's and found only 2 that do not cause the lean condition. What would be the recomendation of the kind folks here who have experience with PHP? Upgrade the programer or the intake? I believe the cost to be almost the same.

Thanks,
Redshirt

Hi Redshirt - we won't kick you around.

I wonder, is this "cut out" you describe during acceleration? If so, it's very likely that the rev limiter is set too low and you are in a lower gear. Coming off the gas allows it to shift up and then you don't hit the rev limit (unless you really get on it).

To fix this, reinstall your tow tune and then in the "Custom Options Menu", scroll to "Load Previous Settings", which will reload your current Tire Size, Gear Ratio and other things. Then, scroll to the Rev Limit or Max RPM setting (I've forgotten what it's called), and set it to 5500. Make sure your WOT 1-2, and 2-3 upshifts are about 5000, and set the 3-4 WOT upshift to 4600.

Now, regarding the CAI - we here at PHP don't think much of them, but we can't really say they're all bad. My first recommendation is to replace it with the Gotts Mod version. You can do a search here for information on that.

And, we think you'll appreciate the "refined performance" of custom tunes, but we don't really push those if you don't want to try them. The canned Level 2 tow tune in the Edge is really pretty good for all around performance, so if it works, OK. Some CAIs DO make the engine run lean though (but that does not give the symptoms you describe), and custom tunes can fix that.

Glad you've joined us.

- Jack