Surging at light acceleration

[442w30]

Tried it in level 1 and no surge. I live in San Diego and can go from sea level to over 4000 feet in about 30 minutes. I experience this going up the winding mountain roads in level 2. Just had my truck reflashed by the dealer for TSB for the rev up mystery shift just before installing the gryphon. Reflash had fixed the factory problem so I cannot point at factory settings, went up the same grade in stock, level 1 and level 2 and only felt the surge in 2. Will fill up with 91 octane in a couple of days and switch to level 3. I already know I want to get a 87 performance, the tow does what it is supposed to do and that is hold the gear longer but I think the performance tune may be more to my liking for every day driving. I do over 40,000 miles a year. Like this product A LOT!!!!! will give PHP a call after I have tried the 91 performance tune just so I have as much information for them as possible.

[Jackpine]

Glad you like it and it sounds like you're going to put it to good use - like I did. With it, I could suddenly pass without the heart-stopping delay. My trailer pulls felt "routine", and, I got better fuel economy.

Since I hve two batteries in the trailer and a refrigerator, I appreciate the voltage readout, and, of course the TFT readout when towing. I also like the digital readout of CHT, since that's what really matters. The Comm Gear readout confirms what I'm feeling, and helps me select the proper gear shift position and O/D on/off selection when I'm towing.

- Jack

[442w30]

Hi JackandJanet, I have gone up this same grade for 25 years and it is not so extreme that I have ever needed to lock out OD, have had 5 5.4's since 97 with the same 3.73 and 2 with the 3 valve so I have a pretty good idea how these trucks run. Surge is only in the 87 tow, like I said I will try the 91 perf as soon as I suck about 35 gallons out of my 36 gallon tank.

John.

[08F150]

Hey 442w30 was wondering if you have tried the 91 tune yet and if there are any surging issues?

[442w30]

Just got back into town and yes the surge is evident on level 3. I switched back to level 1 after 3 tanks of 91 octane on level 3, about 90 gallons so I know there was no octane dilution. Just saw another post regarding the surge but I do not have a FFV truck. I did get a reflash before installing the Gryphon from the dealer for mystery shifting and that did solve the problem completly (mystery shifting not the surge). Yes it does feel kind of like the TC is confused under very light load.

[04FX4]

Are your RPMs jumping up and down?

[442w30]

It is so subtle that I have not noticed rpm flare in the tach. I dont have the display hooked up, I will install and reset to level 2 then watch rpms on display readout vs dash tach. Thanks for the thought.

[GasPasser]

Wondering if anyone figured anything out concerning this. My truck does this every now and then on the edge of 3 & 4th gear going up an incline with light throttle. I have to give it a bit more juice to lock the TC and stop the surging. I am running a gryphon in level 2 with a CAI while I'm waiting on my custom tunes. It was doing this stock too and has been for a pretty good while. I wonder if it is just wear & tear on the TC??