Just a quick question. I have a 2012 ecoboost. I got SCT x3 programmer, I ran the 87 level for a while and thought it could do better. So I put the tuner on the 91 level and it ran a lot better. This was all on 87 gas. Is there any issue with running 87 gas with the next step up octane rating since it runs so much better? Also on the SCT's does disabling the speed limiter do anything else except that?

Thanks
Jason

 

I have a SCT programmer for my truck and have an 87 & 93 octane tune. I was told by SCT not to run the high octane tune with regular fuel. I'm not exactly sure why but I would recommend you call and ask them.

 

Thanks, I've read up and down online not to run the 93 tune and 87 because the timing would either retard the timing and defeat the purpose, or detonate. But what about the mid level 91 and 87 octane gas.

 

Don't run the higher octane tunes unless your running the higher octane fuel.

 

But it's running so good! Lol

 

The risk isn't worth the reward.

 

Famous last words....before oh s***!


If you think it runs good now ditch the crappy canned tunes and get some MPT or 5 Star tunes...and run the proper octane.

 

I set it back to 87 and ordered a 5star. They had their tunes on sale.

 

How long is their turn around time. I know with the holiday they won't get my order till Tuesday.

 

Nevermind........they called me today (sunday) to verify a couple things with my order and already sent my tune. That was awesome

 

5star tune worked wonders. Eliminated the throttle lag at tip in, Trans doesn't hang around in 6 gear when not needed. When faced with a incline the Trans down shifts as expected it would in stead of staying in a high gear and low rpms and ******* up a incline unless the throttle is pushed enough to force it to downshift. I haven't seen any decrease in mpg on the avg gauge. So overall I'm great satisfied with their service and tune. Makes my 3.5 eco feel more like my previous 5.4.