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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 06-26-2013, 04:58 PM
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Default Octane and Tuning

I know this has been beaten to death and I've been researching but I can't find a definitive answer to what I'm asking.

I am currently running the 87 tune with my DS inTune and I have 89 in the tank. I did notice improvements and I am pretty pleased with it. But some say that running the 87 tune is a waste of the money spent on a tuner and that one should run at least the 91 tune if not the 93 tune. 93 is not easy to find where I'm from, I might be able to find it about an hour away. I can get 91 but at times it $1+ per gallon more than the 89. I should mention that this is not a street machine. As much as I love blowing the doors off of the unexpected, my focus is more off pavement. That's not to say that I want to destroy my fuel economy when I do road trip. But I have seen some say that they've gotten better MPGs with the higher octane. Is that true/normal? I'm just wondering if I'm utilizing my tuner as much as I can (without doing custom tunes).

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Old 06-26-2013, 05:28 PM
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You will most likely get slightly higher fuel economy with a higher octane tune/fuel.... but it won't be enough of an increase to offset the increased cost of the higher octane fuel. The other benefit would obviously be the added power.

Honestly if fuel economy/cost is your main concern I wouldn't worry too much about stepping up to a higher octane. Especially if it's that much of a difference between 89 and 91.... that sounds ridiculous to me!!

I have the BD in my truck and so far I've only run the regular tune with 87 fuel... I'm getting pretty good fuel economy and as much of a power increase that I'm happy with. I do plan on stepping up to a premium (91 tune) very shortly and running that for a while just to see what that feels like and what kind of numbers I get. But like I said, I don't expect the increase in fuel economy being enough to offset the increase fuel cost.
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Old 06-26-2013, 05:28 PM
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I dunno, I think for a dollar more a gallon I would just run the 87. If you do occasionally want to run a higher octane tune, you'll want to run an entire tank of the desired tune's octane before installing it. Otherwise you'll probably experience some significant spark knock. I know you said no custom tunes but they really would help you get the most out of the tuner, and would make the transition between tunes less prone to spark knock.
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Old 06-26-2013, 05:58 PM
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Default

Thanks Guys! These were kind of the answers I was expecting. And I'm not totally against doing custom tunes. I'm just having a hard time wanting to spend more money towards tuning as I just bought the DS inTune about 2-3 weeks ago. I might look more into it down the road. Do those custom tunes benefit the offroad enthusiasts as much as they do the street demons?

I appreciate your input thus far! Keep it coming!
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Old 06-26-2013, 06:32 PM
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Yes they help on and off rode and they are not as pricy as everyone thinks we are talking about $125.00 and its well worth the money
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Old 06-26-2013, 08:31 PM
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From my experience, the 87 performance tune is the best cost/mile. The higher octanes give more power with no more mpg over the 87 tune.

Using the 87 tune is not a waste of money though, you still gain a lot over stock.
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Old 06-29-2013, 05:13 AM
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I just switched from the diablo 87 to 91 tune. I'm running the 91 tune with 93 octane in the tank. I wouldn't say the truck is that much faster, just a little smoother and more responsive if anything. Not enough to warrant the extra cost. FYI, filling my tank with 93 ran me about $90
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Old 06-29-2013, 09:35 AM
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Quote:
Originally Posted by Chefalan23 View Post
I just switched from the diablo 87 to 91 tune. I'm running the 91 tune with 93 octane in the tank. I wouldn't say the truck is that much faster, just a little smoother and more responsive if anything. Not enough to warrant the extra cost. FYI, filling my tank with 93 ran me about $90

Good to know. At currrent prices in my small rural town, running 91 would cost me over $100 to fill the tank from E.
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Old 06-29-2013, 04:01 PM
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Quote:
Originally Posted by patricklee85 View Post
Good to know. At currrent prices in my small rural town, running 91 would cost me over $100 to fill the tank from E.
The info in this thread is really helpful. I'm anxiously awaiting the arrival of the 2013 tuners with 8 speed support.

I have the 121 liter tank, if empty it would cost $140 to fill with 87 and we have some of the best gas prices in Canada.
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Old 06-30-2013, 10:49 AM
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Quote:
Originally Posted by Tcon View Post
The info in this thread is really helpful. I'm anxiously awaiting the arrival of the 2013 tuners with 8 speed support.

I have the 121 liter tank, if empty it would cost $140 to fill with 87 and we have some of the best gas prices in Canada.
It will cost you $177 for the "good stuff" when prices spike
and yes, even in Edmonton. But 94 Rocks with a Diablo 93 Tune! gotta pay to play


I've ran 94 octane since new, all year round on a Diablo 93 canned tune.
Last Winter was the first time I went down to the 89 octane and stock tuning, never doing that again.
(The owners manual recommends 89 octane, so I didn't want to go down to 87 and deal with engine knock)

As soon as I reloaded my 94 and re-tuned in the Spring it felt like a Beast again, almost forgot just how good it was with my shift points maxed out at 6400 rpm.

It does cost more but to me it's worth it.

Once my Ripp goes on my octane will be boosted to 116 with alcohol injection
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