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Old 11-16-2013, 03:24 PM
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Default Hemifever 91 oct tune question

I have been running the 89 tune from Hemifever for a few months. Now that gas prices are down some I thought about trying the 91 tune. Earlier this week I took the truck in for the pinion nut recall. I restored it to stock just in case they checked the pcm and it drove like a pig. I couldn't believe the difference. My question is there a big difference between the 89 and 91 tunes? Is it worth the extra price for gas? Sorry I meant to post in the 2012 section.

Last edited by DWWHemiguy; 11-16-2013 at 03:26 PM. Reason: wrong section
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Old 11-16-2013, 05:52 PM
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I personally can tell a pretty sizeable difference between 89 custom tunes and 91 custom tunes, I generally like to run 2 points higher octane than my tune as and a catch can is a must as well so that I can get a little more spark and advance the timing a little more on my custom tunes. You might not tell the difference right away, however if you drive around on it for a couple of months, and then go back to your 89 tune, it will be like when you went back to stock from your 89 tune

(this is not referencing HemiFevers tune as I have never ran one of his tunes, but is referencing GOOD custom tunes in general. ****Not saying his tunes are not good by that statement either, I believe that they are pretty damn good based on all the reviews he gets )

Hope this helps

Thanks
Jeremiah
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