Need Help on '04 5.4 custom tunes.

[cajunboy2208]

Originally Posted by Longshot270

Ticopowell has it pretty much nailed on the CAI issue. Having a custom tune written for it makes the intake safe. The only problem I'm seeing is a chance of running 87 octane on a 89 tune or 91 octane on a 93 octane tune. You can run fuel that is a higher octane but not lower. What you could do is get a set of 87 and 91 octane tunes and if you ever fill with the higher grade stuff you just add 1 to the timing.

Eh? I got an 87 custom tune months ago. And I am wishing I went with the 93. So all I need to do is add 2 to the timing and I can start running 93?
The stock 93 performace tune did better than my 87 custom performance tune...

[ticopowell]

You can run 93 gas in an 87 tune, but it wont take complete advantage of the 93, even if you change the timing, but changing the timing would help. and again im no expert, but this is what ive seen/learned from reading the forum for the past yearish

[Longshot270]

Originally Posted by cajunboy2208

Eh? I got an 87 custom tune months ago. And I am wishing I went with the 93. So all I need to do is add 2 to the timing and I can start running 93?
The stock 93 performace tune did better than my 87 custom performance tune...

You can run 93 and add about 2-3 degrees of timing to it. But start with 1.5 advancement. If you dont have trouble go to 2 then 2.5,2.75 but I would advise against going over 3. When you are adjusting the timing you will raise it and get a tiny bit more power, when you dont have any increase in power or the engine knocks then take it down a bit. You do not want to have too much timing advancement because that is really bad for the engine.

Funny, my custom 87 on 87 beats my canned 93 on 93.

[cajunboy2208]

Originally Posted by Longshot270

You can run 93 and add about 2-3 degrees of timing to it. But start with 1.5 advancement. If you dont have trouble go to 2 then 2.5,2.75 but I would advise against going over 3. When you are adjusting the timing you will raise it and get a tiny bit more power, when you dont have any increase in power or the engine knocks then take it down a bit. You do not want to have too much timing advancement because that is really bad for the engine.

Funny, my custom 87 on 87 beats my canned 93 on 93.

Thanks for the info. Next fill up I will give it a try.
Well I ordered mine when they were rushing to catchup. So... eh

[Longshot270]

Originally Posted by cajunboy2208

Thanks for the info. Next fill up I will give it a try.
Well I ordered mine when they were rushing to catchup. So... eh

Yeah, but like I said, take your time to make sure you have the right amount of advancement. That is one of the adjustment that could have expensive consequences.

Maybe that but as Bill says, every truck reacts differently. What works for one doesn't always work the same for another.

[Jackpine]

Also, if you don't completely FILL your tank with 93, you are running a mixture that has an octane rating somewhere in between. Longshot's advice to start with +1.5 degrees of advance is a very good idea in this case. (If you were "half and half", you'd be burning 90 octane gas.) Later, when you fill up again, you'll be a lot closer to a true 93 octane mixture.

- Jack

[cajunboy2208]

Yea. Lovin the 93 octane. Set my gears correctly, tire size correctly, and advanced timing by 1.5 so far. And big time difference. Just did the 1/4 in 15.18 with a .76 reaction.
Might try to advance timing to at least 2.0, possibly 2.5 and try to get into the high 14s.
Defitanly should of done a 93 octane tune. Oh wells.
Next mod I get I will get 93 custom instead of the 87.

[Longshot270]

Be careful on that timing. Of all the changes you can make that is the one where you can have too much of a good thing. If you hear anything that doesn't sound right back off the timing. You will probably be hitting a peak soon though since you are making tweaks for 93 on an 87 tune.