Okay, shrinking tire size on the chipset.

I don't have the user's manual. Do I have to reset the truck back to stock or can I do this as it stands?

HELP!

 

The formula for tire size (2 * tire-width * aspect ratio / 25.4 ) + wheel rim size
I have 285 75 16 so (2 * 285 *.75 / 25.4 ) + 16 = 32.83

 

I just placed a level on top of the tire and measured the distance to the ground and inputted the number into the programmer. And no you don't need to set it back to stock. my speedo was accurate after the tune.

 

this thread makes me sad because i forgot there is no tuner for the 3.7l i even looked it up and then i remembered

 

Aren't a whole lot of options for the 4.7L V8 after 2006, either. Superchips is about it. Predator seems to be less reliable. I wish the SCT units could tackle vehicles newer than 2006.

 

When doing the speedo calibration, don't trust the tire manufacturer's specs or even their "actual size" on their websites. They lie and always overstate tires as larger than they actually are when mounted.

Go take you a tape measure and measure them, put in the number rounded down to the nearest 1/4" and you'll be damn close if not right on the money.


Also, EVERYBODY b(tches about the SC website. Says how great the tuner is but how **** poor the updater is. Maybe I've been lucky, but I've owned three SC tuners over the past 8 years and had a problem doing an update once - and found out the site was down - next day got my update with no problem. I update about once every six months or so now - just to make sure my files are the latest. It's not the greatest written software in the world, but it gets the update done every time...

 

Lucky you. Can't even get the updater to run properly on my computer.

 

I am a week into running 87 tune w mid grade fuel. Improved mpg and drives with more umph. My lootnwas well spent.

 

Hypertech makes one for the 3.7. They sell them for around $300. I'm not sure how well they work. But I plan on buying one when I get the moola. They are the only company I've found that makes one for the 3.7.

http://www.hypertech.com/

 

Received my tuner last Friday, Superchips 3865, and updater worked great. You just have to be patient with it, it seems. Sometimes it looks like its frozen up, but its not, it eventually "wakes up" and works fine.

91 performance tune is what I'm running, as I usually fill up with 91 octane fuel anyway (89 usually has 10% ethanol, no thank you). May try the 87 tune soon so see if its close, that way if I'm in an area without 91 octane, I won't have to worry about it.

After three 200+ mile stretches doing 65-80 MPH on the interstate and state highways in Nebraska (went to a friend's wedding), so a few slow down and speed ups through towns or construction zones, over 20 MPG each time. The last I was doing a little more interstate, closer to 80 MPH over the last hundred miles, and I actually got over 22. I am really liking this Superchips right now.