Superchips = AWESOME!!!
JK Freak
Joined: Mar 2011
Posts: 791
Likes: 0
From: Vancouver, BC
23.5mpg must have been mostly downhill, right? I have same tires, maybe a bit lighter since I'm on 16" wheels, and I'm in the 19's mpg hwy, at 60-62mph, which is great too, I think. 3.73 gears, OD always off. It will not hold OD, and even if it would some times, you're not doing your engine any good running it at 100% engine load. I'm running 87 tune, not 91, but the 2-3 extra hp (I assume) will not do anything significant. Overall I'm not happy with Superchips.
Thread Starter
JK Freak
Joined: Nov 2011
Posts: 724
Likes: 1
From: Louisville, KY
I reset the gauge as soon as I hit the highway this morning and set the cruise at 60 and this was the average MPG reading after 30 miles. It was higher at some times but leveled out here!? I'm happy with it either way and will run a tank through for more accurate results.
JK Freak
Joined: Mar 2011
Posts: 791
Likes: 0
From: Vancouver, BC
Autos tend to get more benefit from a "power" boost than manuals. Since we are stuck with the tranny changing gears, its important to get your tire and gearing correct so the computer can adjust the shift points based on an accurate speedo. Without the accuracy, your Jk is shifting at the wrong points. That's why even people using just a Procal can feel an improvement in "power".
As far as mpg....the number the OP sees on the dash just can't be right. Either the speedo is off so the mpg calc is off or something else is wrong. Any improvment in mpg from a Superchips is probably 0.5 to 2 mpg. Unless he was getting 20 to 21mpg, is running a completely stock Jeep, does all highway and is very light on the gas pedal....that readout is not accurate. If the speedo is accurate, I would love to see an actual result hand calculating it when he fills up on an empty tank
JK Freak
Joined: Mar 2011
Posts: 791
Likes: 0
From: Vancouver, BC
30 miles is not quite enough to make any valid conclusions. Going down a mountain I could probably get 40+ mpg, but that's rolling, not pushing.
Thread Starter
JK Freak
Joined: Nov 2011
Posts: 724
Likes: 1
From: Louisville, KY
Originally Posted by TheTerminator
30 miles is not quite enough to make any valid conclusions. Going down a mountain I could probably get 40+ mpg, but that's rolling, not pushing.
I think I'm going to have my friend put it on his dyno and play around and see some true results on power.
JK Jedi
Joined: Dec 2011
Posts: 5,234
Likes: 4
From: Nevada City California
JK Enthusiast
Joined: Jan 2012
Posts: 491
Likes: 0
From: Boynton Beach, FL
Have you verified the speedo is accuarate using a GPS or similar? When I first got my Superchips it took a few tries to zero in on the speedo. Had to play quite a bit with tire size. My older 35's needed to be programmed at 33.25" to get a good reading. Putting in 35" was way off....
Super Moderator
Joined: Jun 2011
Posts: 11,054
Likes: 85
From: Hendersonville, Tennessee
Originally Posted by mpkelley20
I as well aware of that but let's just say Superchips isn;t exactly "accurate" when it comes to tire size adjustments. When I had my Procal, I had to set my tire size at 34" which is what I actually measured my tires using several different methods. When I got my superchips, as I said, I had to drop to 33.25. My new tires are Toyos and are bigger than my Bighorns by quite a bit. They measure almost 35", however, 33.5" is the sweetspot for with Superchips for these tires on my rig. My point was that what you stated at the end...use a GPS to get a better reading as you have to tweak the tire sixe a few times usually.