X2, i'm really wanting one also but just scared that the dealership will find out and void the warranty.. Being my luck if i dont tune it then id never have to go in for warranty work, as soon as i flashed the pcm some kind of warranty work would be needed.

Knock on wood i havent had a single problem in the 14,000 miles ive owned the truck.

Also i take my truck to the dealership to get the oil change, tire rotation etc, id also be afraid that they would try to do a update to the computer and screw up the tune, or if i told em not to do the update that would probaly raise a couple eyebrows.

 

I never buy a vehicle with a warranty, so I never have to worry about voiding one.

 

Well, I've been waiting to post until I was able to make it to a local dyno, but work has been crazy the last couple of weeks. I've tried a couple of the 87 tunes. It was pretty cool trying out the 87 performance tune with the different shift points and whatnot. I could definitely feel a little difference in the acceleration @ WOT too. For now I'm keeping it on the 87 economy tune to see how much of a difference in mpg's it makes until I can get to the dyno and go thru the 87 tunes. Afterwards I'll be filling it full of 93 and playing with those tunes for a while and depending on how much of a difference it makes with the performance and mpg's, I may just keep running 93 in her. I'd like to go back to the dyno just to see what the 93 tunes put down too. Got a buddy over there, so it's not like I'll be dropping a pile of bread on the dyno trips... I hope to be posting results this weekend, but it sounds like we're gonna end up working 7 days again this week too..

 

No worries, you can update in 6 months if you want, I was just curious! My 87 eco has put me right about where I though I would be when calculating new mpg with new tire size from old mpg. Funny thing is, I got 13.6 (or so) on 87 eco on almost entirely highway, but I got 13.9 on 93 perf when I was ******* the hell out of it because of my headers on almost all city/slower roads

 

It seems like I also heard that from someone else that the tune that made the most power would also get the best fuel mileage. Doesn't seem to make a whole lot of sense, but then again what do I know? LOL

 

More horsepower may not require the motor to work as hard to move the same mass. Some efficiencies picked up via properly advancing the timing to take advantage of the higher octane, not to mention the tuning/refining of the A/F ratio.

 

And that makes perfect sense. Like you said, it seems like it is more refined. It seems to crank easier, idle smoother, and even shift better than it did from the factory.

 

I agree with the above comments. I just don't know if I can choke down the extra $15 at every fill up. I need proper, multiple, consistent trials to determine if the 93 is worth the extra money as far as mpg goes.

The added power and energy on tap can play a part, as was said by Cheef, especially with my aggressive driving style

 

All of my tunes idle smoother for some reason, I like it though!

I hope your transmission is shifting better. The stock shifting leaves a lot to be desired!

The higher the octane = more fun. Just wish I had a '13 stang GT tuned on 93 that I could rag on

 

I remember talking about the Mustang, I'd love one of them too!

 

I can give you my impressions with mine. I have an '11 Lariat with the 6.2, and a SCT Livewire tuned by 5-Star. I have a 91 performance and a 91 Tow tune. In the next few weeks I'll be ordering up a few more tunes. On the SCT canned tune, it made a noticeable difference in general acceleration. Less throttle, better pick up and shifts are similar to stock in timing but are just a bit firmer. And kick downs are quicker and accels faster. Gas mileage didn't seem to change, but also I wasn't trying for that . Towing with the canned tune was actually not as good as stock, so I won't be doing that again. The 91 performance tune is a real kick! Wow! It's much quicker off idle and revs hard and fast. With a "regular" throttle the shifts are quick and firm. A lot of that has to do with how fast I'm picking up speed. When I give her a hard jolt on the throttle, I'm pressed back into the seat and the shifts "Snap" into gear, and the tires bark. Gas mileage? Well, if I drive civil the gas mileage is similar to stock or slightly better. If I drive "spirited" the mileage drops a bit. I'm having problems with my tow tune. I haven't had time to contact 5-star about it yet. Been layed up in bed the past few weeks due to my back. The problem with the tow tune is that the gas mileage has really suffered. Before I was averaging 11.5-12.5 towing my Ranger out to West Virginia. On the tow tune I was getting 9-9.5 mpg. And on a long incline, 3%-4% incline and over a mile, by the time I got near the top the throttle was way down near the floor and power was really off. By the time I got to my place in WV my exhaust pipes where thick black and I used 8-9 more gallons. So I really need to get that fixed. BUT, on the performance end I'm very pleased. I will be ordering up a 93 performance, tow and a mileage tune as soon as I feel better, and get the tow tune fixed...

 

Yeah I really need to try out my 93 tunes. I wanted to wait until I was able to make it over to a dyno just for s**** and grins, but work has been so crazy that there just hasn't been even a remote chance of going... Today is day 18 straight at work with no light at the end of the tunnel yet. The checks have been nice, but dang I'm ready for a day off.

As far as barking the tires when shifting, is that happening when you are downshifting hard or when you're going through the gears from a stop? Not that I want to necessarily want to be able to bark my tires, just wondering. I've read a couple of your tuning threads and feel kind of familiar with your truck. Definitely appreciate the info and opinions you've posted. There doesn't seem to be a whole lot of 6.2 stuff out there...

 

Off idle I have to be careful not to nail it too hard, sometimes even with traction control it spins crazy if I stay in it. Depending on the road surface, the 1-2 upshift on hard accelleration barks quite loud and she really jumps. Once or twice I did here a bark on the 2-3 shift, but it shifts hard enough to jolt ya. On a kick down around 25-30 mph she has actually spun the tires. But that's not a regular thing, and sometimes I can here a bark. At 45 mph or so she'll drop down to 2nd., and literally throw me back and jump on the next shift. Any other time if it does I don't here it.

 

Yeah... After this storm passes and I run this tank of 87 out, I'm DEFINITELY trying the 93 perf tune... LOL

 

I love the 91 performance tune. That's what I'm on now. I just barely touch the pedal and the shifts are quick and I'm at 60 mph in no time. I'm looking in the rear view mirror and anybody that was around me is way behind. I bet they think I'm really tramping down on this thing and I'm only giving it maybe an "inch" of throttle? I can't imagine how much better the 93 performance tune would be. For everyday driving, the SCT canned tune is better. The shifts are timed closer to stock, the shifts are at a lower RPM so I get better gas mileage, but I still get firmer shifts. One thing I have noticed, It's better to give it a quick gradual 3/4 throttle, instead of slammin' it to the floor. It's strange. If I do go to the floor, Then, if I raise the throttle up to about 3/4 from the floor, I feel a real noticeable increase in pick up. So, it performs much better if I give it a quick snap to about 1/2 throttle or so, let it shift into second (which is like one second off idle ), then press it to about 3/4 throttle or so, and it really flies.