Power Hungry Performance Forum - Custom tune question

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- - Custom tune question (http://forum.gopowerhungry.com/showthread.php?t=120)

Quote:

Originally Posted by Northern Supercrew (Post 555)

agreed...the 87 perf tune seems stronger than the 93 canned anyway.:shocked: i used to run 91 in my old Hypertech PP3 on the 93 canned tune. and 92 when available. but i digress....you guys know alot more than me....but i'm learning:thumbsup:

We're ALL learning! ;) When you stop learning, you're ready to be "planted" (as in six feet under). :margarita: :guiness: (Dang, Corey! You even found a Guinness smiley)! :yourock:

- Jack

Quote:

Originally Posted by JackandJanet (Post 549)

I think we're on the same page now, but he was asking about using 93 octane gas with an 87 octane tune.

Quote: "I was wondering if you can just change the octane setting to run 93 octane on the 87 performance tune."

I said yes, and he could probably bump the timing to gain a bit of power to offset the increased cost of fuel, but it would not be as good as a true custom tune.

You said, Quote: "The answer is that TECHNICALLY you can run 93 octane with an 87 calibration. However, you run the risk of detonation even with retarding the timing."

And here, I think is where we crossed ideas. But, I now believe you were thinking he should not put 87 octane gas into a vehicle that is tuned to run 93 octane (and that's why you mentioned "retarding the timing").

But, I understood you were saying not to put 93 octane gas into an 87 octane tuned vehicle, or damage could result. And, I was puzzled by your comment on retarding the timing. Also, I'm pretty sure Northern SuperCrew thought he should either replace his fuel tank contents with 87 octane (OK, but wasteful) or raise his tune to 93 - which would be bad, since he'd be burning 91 octane in a 93 octane tuned truck.

So, all is well, now that we are communicating again. Riceball and Northern SuperCrew are you with us now? It's OK, just not particularly efficient, to burn a higher octane gas in a vehicle tuned for 87. And, if you do it, you can advance the timing a bit. (The Edge/Gryphon manual even gives you guidelines here as I remember).

- Jack

All is good

I was just wondering if it was possible to change the timing on a custom tune. Many times when I go to Wisconsin you will find Mid Grade 91 or even 93 octane cheaper than 87. Maybe they just don't move it as fast as Reg.
Thanks for the help.

How many posts do you need to be a WHOPPER? :shrug:

Bob

Quote:

Originally Posted by Riceball1 (Post 563)

How many posts do you need to be a WHOPPER? :shrug:

Bob

You can change it yourself to whatever you want in your User CP! :2thumbs:

Thanks--------------Now I have to think of something :woot::woot::woot:

Quote:

Originally Posted by Riceball1 (Post 563)

Hi again Bob -

You CAN change the timing on ANY tune (other than level 0). BEFORE you do this though, when you enter the "custom options" menu, go to "Load Previous Settings" first so that you reload your correct tire size and any other custom things you set. Otherwise, you'll just have default values in those places.

My Gryphon manual (really just an Edge manual), but Corey's updating it, says a rule of thumb is to increase timing by 0.5 for each octane count you go up. So, if you were tuned for 87 and had a full tank of 91 on board, you should be able to increase the timing by 2 degrees. What you'll probably have though is a mixture, so, if say you put a half a tank of 91 in and mixed it with 87, you'd really be running closer to 89 and should increase timing only 1 degree.

Use good judgment and you should be fine. Don't forget to reduce the timing when you start filling with 87 again, and don't forget to "Load Previous Settings" each time.

Sorry if I sound like I'm lecturing. I taught in the University here for 20 years and it sort of "sticks". :deadhorse1:

Somewhere in the f150 forums, I read that you could also increase timing for altitude. We're at 2500 feet here in Tucson and I tried increasing my timing by the smallest possible amount. I got a "wandering" idle and promptly set it back.

- Jack