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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 06-24-2010, 05:37 AM
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Default 87 or 91 Octane Tune

I have a Diablo Sport Predator tuner & currently running the 87 tune. In Calgary we have 91 Octane fuel readily available but 93 is hard to come by. Would i see much difference between an 87 & a 91 tune ?????
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Old 06-24-2010, 07:15 AM
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yes a 91 tune you can deff tell a big diff!
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Old 06-24-2010, 10:52 AM
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not really jsut change shift points. i dont know dotn get me wrong with superchip i change all that same as a 93 tune. i going to get a diablo soon spend 2 much money or other parts
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Old 06-24-2010, 01:48 PM
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Guess I'll just have to try it & see. Thank's guys. Would you run a couple of tank's of 91 before doing the tune ????
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Old 06-24-2010, 04:46 PM
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You don't need to run a couple of tanks of 91 before you do that tune. Just put in a full tank of 91 when it gets low, install the tune, then take if for a spirited drive.
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Old 06-24-2010, 05:14 PM
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Thanks Michael, still got 3/4 tank of 87 so have to wait until next week but will let you know the difference.
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Old 06-24-2010, 06:09 PM
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next week take me a good 3 days to waste a hole tank lol
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Old 06-25-2010, 12:24 AM
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I tried both the 87 and 91 with modified parameters (MDS off, Rev Limit +600, throttle response +15). There is a noticeable difference. But not so much for me to spend the difference in the cost of gas. Just today, here is the peoples republic of Kalifornia, regular cost $3.07 for 87 and $3.40 for 91 (~$11 for 32 gallon tank )
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Old 06-29-2010, 02:53 PM
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So yesterday i filled up with 91 octane & plugged the Predator in to my truck & its only giving me a choice of 87 or 93 tune. The programme on my desktop semms to be all screwed up as well.
Shoud i restore to original tune & delete the programme from my desktop & Re-install ??
& would i be able to download the 91 tune from Diablo site.?
Sorry to be a pain but this is driving me crazy
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Old 06-29-2010, 05:52 PM
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What is your elevation? Im assuming around 2-3k feet? If so, you can use a 93 tune w/ 91 octane. You dont have as much oxygen in the air at that elevation as they do at sea level, therefore they dont even sell it most likely anywhere in your neck of the woods.
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