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-   -   Diablo Tune Question - Octane (http://www.jeepgarage.org/f6/diablo-tune-question-octane-21376.html)

blackpepper 04-06-2011 01:31 PM

Diablo Tune Question - Octane
 
So I'm now paying $4.399/gallon for 91 octane fuel with my 91 canned tune, and I'm officially throwing in the towel. I'm going to switch back to the 87 tune but my question is: "can I run 87 octane even though Jeep recommends 89 octane?"

I know their recommendation is for stock settings so if I switch to the 87 tune, will it allow me to run a lower octane since the computer is "tuned" for 87 octane fuel?

If not, I'm just going to run the 87 tune with 89 octane fuel and turn the MDS back on.

Robert Palmer 04-07-2011 12:24 AM

Re: Diablo Tune Question - Octane
 
Yeah man you can run 87 or 89 on the 87 tune.


Sucks you have to throw in the towel on 91. :(

JeepCoop 04-07-2011 01:46 PM

Quote:

Originally Posted by blackpepper (Post 390780)
So I'm now paying $4.399/gallon for 91 octane fuel with my 91 canned tune, and I'm officially throwing in the towel. I'm going to switch back to the 87 tune but my question is: "can I run 87 octane even though Jeep recommends 89 octane?"

I know their recommendation is for stock settings so if I switch to the 87 tune, will it allow me to run a lower octane since the computer is "tuned" for 87 octane fuel?

If not, I'm just going to run the 87 tune with 89 octane fuel and turn the MDS back on.

I'm right there with ya brother. I took the jeep in to the dealer and the updated (flashed) my trans. Went to re program and I gotta update my predator. Doin that today and thinking bout going to 87... Hmmmmm

4.whoa 04-07-2011 02:57 PM

Re: Diablo Tune Question - Octane
 
I know gas prices suck, but how much of a difference do you pay from 87 to 91? Here it's only $.20 gal ,so it's only like $3-4 a tank.

JeepCoop 04-07-2011 03:13 PM

Quote:

Originally Posted by 4.whoa (Post 391480)
I know gas prices suck, but how much of a difference do you pay from 87 to 91? Here it's only $.20 gal ,so it's only like $3-4 a tank.

Yea it's about the same. But that would be an extra $16 a month. Not too bad but still. Haha

Martyp 04-07-2011 04:52 PM

Re: Diablo Tune Question - Octane
 
Just outta interest here, how much extra performance do you get from running higher octane stuff?

We have 95 as a minimum here with the possibility of 98 for a little more. 102 is available but its twice the price!

I'm currently running a 91 tune through the superchips tuner but would be interested if a custom SCT tune could net better gains from our fuel or if its minimal.

Always been curious about that... :)

dmsfun 04-09-2011 09:34 AM

Re: Diablo Tune Question - Octane
 
You can run 87 on the stock tune with no problem. 89 oct costs just a bit more (.20/gal here) than 87, but 87 will give you lower mpg than 89 since timing is pulled to avoid knock. With todays prices, it saves money by using 89 over 87 and the hemi runs better. I get 1 mpg better with 89 than 87, and that saves about a gallon per tankful, so over $4 per fillup. IF I pay .20 less per gallon for 87, that is only $3.40 per tank saved.

sanitarium16 04-21-2011 08:53 AM

Re: Diablo Tune Question - Octane
 
Don't worry, it will be $5/gallon by summer. Somehow this is still all bush's fault right? This is such a joke.....then again we do have the joker in office.

JeepCoop 04-21-2011 09:36 AM

Quote:

Originally Posted by sanitarium16 (Post 400342)
Don't worry, it will be $5/gallon by summer. Somehow this is still all bush's fault right? This is such a joke.....then again we do have the joker in office.

Yup still Bush's fault and the Joker is white, not black. And he kills people. Pick a new proper villain for our pres haha

05WK 04-21-2011 01:38 PM

Re: Diablo Tune Question - Octane
 
Quote:

Originally Posted by gregums79 (Post 400382)
Yup still Bush's fault and the Joker is white, not black. And he kills people. Pick a new proper villain for our pres haha

And the joker is an american citizen... (BURN)

blackpepper 04-21-2011 01:41 PM

Re: Diablo Tune Question - Octane
 
Double burn!

In case anyone would like to know, I'm still running the 91 tune but with MDS back on.. I just don't like the rough transitions that *occasionally* occur when MDS goes on/off but I'm dealing with it.

Based on my driving habits and a calculated average, I would be saving $158.60 a year if I went back to 87 octane. That's virtually nothing these days (:rolleyes:) so like I said, I'm still rockin' the 91 tune for the time being.

05WK 04-21-2011 03:34 PM

Re: Diablo Tune Question - Octane
 
We got 93 in TX for only 4.02 right now...


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