RJBeast

I was actually just looking at SCT last night. Seems like all arrows point to a tune! Card, thanks for the help bro! So after a tuner should you take it in for a custom tune or run what it's loaded with?

obusnizzle

Just order an X3 or X4 from MPT, 5*, Lund, or Unleashed and tell them what needs to be changed in order to get the proper shift calibrations for the tires.

RJBeast

Appreciate all the help. A lot to consider now!

Cardinal Fan

You're welcome man. You can adjust the canned tunes on the SCT. It just requires some knowledge and research.

AricsFX

iTrader: (3)

The shifting and huge loss of power is not normal, sorry. Running a 3 inch level and 295/60/20 trail grapplers on my 2wd 5.0 and none of that happened. Hardly any power loss. What gears do you have? I have the 3:55s

RJBeast

3.55. My rims are extremely heavy, it's actually one of the reasons I almost didn't buy them. I kept my stock rims and tires for towing. Everything returns to normal when the donuts and stock rims go back on. I tend to agree with Card, it needs to be tuned. Thanks.

AricsFX

iTrader: (3)

I had 20 inch fuel Mavericks before switching back to stock 20s on my trails. I promise you weight of rims won't make your truck behave that weird, although a tune will help shift points, I'm not gonna waste away my warranty on a tune

RJBeast

Any idea why it returns to normal when I put my stock setup back on then? Im leaning towards the tires and rims??? It's a shift lag more than a power loss. Anybody think that you can't set your tune back to stock if you need to take it in? Am I wrong?

obusnizzle

There is a menu function on the xcal called, "return to stock". Just as i said before, the dramatically increase in rolling mass has a much more negative effect on your trucks performance than reflashing the PCM with the xcal. Just as some background, one of the dudes who founded SCT, was a Ford Power-train engineer. For some strange reason, well mostly due to the interwebz, there is a misnomer that a reflash causes adverse stress to the engine. Where this "theory" comes from is beyond me. Well, it comes from a lack of research and surplus of willful ignorance as there is always a guy who knows a guy whose uncle had exhaust tubing compression bent by a guy who swears he knows algorithms better than the guys who write it.

If you want to get a better idea of how the software effects the hardware, browse svtperformance.com and read some posts by Shaun@AED.

kmarshall99

I had the same issue just like you when it came down to having an extended warranty on my truck and didn't want to void the warranty.. I finally did some research and came across Stage three performance and they offer two different power train warrantys with their tuner and tune work from 5 Star performance.. Do you research on this, theres a long forum on here over this warranty and a lot of people went this route. It will also cost you, but its nice to still have that peace of mind knowing your covered!

Here is the link
http://www.stage3motorsports.com/701...ar-Tuning.html