Heck I don't even know what forum to post this in....

Long story short, I recently had lift, tires, and gears installed. Getting my custom tune(Gryphon CS) corrected for the new setup has been a nightmare.

Y'all may have read about the problems with Fusion and custom tunes and that PHP is no longer going to support the software at the end of the year. Well we have tried several times getting my tunes adjusted/downloaded. Couple failures and I'm still not sure they are right(Bill was supposed to call me back wed but never did).

I should be ecstatic, my CS says I average 22mpg, but I know that is not right. I couldn't get that when my truck was stock, much less with 6" lift and 35" tires. The CS does read my Speed correctly though(compare to GPS).

So I'm pondering what to do. Drop the CS and try another tuner? Or should I just run canned tunes? Does any tuning even need to be done with new tires/gears(sans the speedometer) ?

I was thinking about setting the truck back to stock and taking it to the dealer and have them "tune/adjust" the truck for the new tires and gears. Then just run that way or use canned tunes.



What do you think?

 

If it ain't broke, don't fix it! Leave it just like it is.

 

Use SCT
order from 5star

that's my vote

 

If the tune you are running is providing a significant increase in power and the speedometer is correct, then be happy with it. The mpg is read out is pretty insignificant.

 

What's the turn-around time like for custom tunes? How's their customer service?

 

Well the "increase" in power really doesn't seem to be their at all. The MPG readout is pretty much the only PID that I really care about. With it "broke", the CS is pretty useless to me. Be better off just taking it out.

 

What does the conventional math say your gas mileage is?

 

About 14 and change.

 

The MPG PID has never been accurate. Watch RPM and load. Those are your two MPG indicators.

 

I know the MPG PID has never been very accurate, but it's never been this far off. Almost 10 mpg.

Is it ok to return to stock and drive with the bigger tires and gears? Or will that cause issues? Thinking, since the PHP CS seems to be dying off, about getting an SCT with 5star tuning. But I'd have to sell the CS before I could afford the SCT/tunes. Thus drive around stock for a while.

 

When you let off the pedal, the truck covers more ground per RPM. This is falsely calculated to mean better mileage. The calculations have always been weighted to favor high averages because full throttle is usually around 5 mpg but low to no throttle is maxed at 40 mpg with the scale being parabolic. These are mainly just 6 AM guesstimates but I know they are typically close. If you spend much time at low throttle your mileage will look real good. If you punch it and WOT to 70 then roll down to about 30, that will also look good because the when you average 10 seconds of 5 mpg with 30 seconds of 40 mpg, the calculated average would be around 30. Obviously this wouldn't work in reality. Unfortunately the computer doesn't understand the inherent miscalculations and risk of inferring values.

So no, the unit isn't dying off. You just increased the % error.

You've also gotta realize that now you are needing custom tuning to restore the power you lost. You may have a similar final drive ratio to stock but you are now slinging around an extra 100 #s of tire and increasing just the forward wind resistance by adding over 8 square feet of truck. Physics will win every time on this. I seem to remember you had the 4.6? If so, the engine puts out some decent power, but grunt power isn't its specialty.

 

Dude, take a second or two and read the thread, the OP does have custom tunes



And the newer Edge products are the ones "dying off" due to inability to handle a custom tune