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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
101 octane with S/C
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<blockquote data-quote="Stangra" data-source="post: 16369729" data-attributes="member: 193061"><p>Remember, the stoichiometric mixture for gas is a bit under 15 grams of air to 1 gram of fuel. For E85, a bit under 10 to 1. If you run any significant amount of E85 it may tend to increase your "octane" a bit, but with a motor tuned for gas it will run too lean. Could be bad news.</p><p></p><p>FYI, when it comes time for emissions inspection only the Roush Phase 1 kit is CARB legal in CA, Phase 2 & 3 are not. I think most of the difference between 1 & 2 is in the tune and adding a CAI, Phase 3 also steps down to an 80mm pulley and adds a fuel pump booster as well. If you're VMP tuned now you probably noticed how much that woke up the car compared to the Roush tune. I'll bet you're already meeting Phase 2 performance. I think you could get a significant bump in power just by adding a pump booster, going to smaller pulley, and getting a tune update from VMP for 101 octane. Emissions test? unplug the pump booster, put the 85 pulley on & reflash the Roush Phase one tune. If your car isn't set up to take advantage of a higher octane fuel it wont help or hurt either, just waste money.</p></blockquote><p></p>
[QUOTE="Stangra, post: 16369729, member: 193061"] Remember, the stoichiometric mixture for gas is a bit under 15 grams of air to 1 gram of fuel. For E85, a bit under 10 to 1. If you run any significant amount of E85 it may tend to increase your "octane" a bit, but with a motor tuned for gas it will run too lean. Could be bad news. FYI, when it comes time for emissions inspection only the Roush Phase 1 kit is CARB legal in CA, Phase 2 & 3 are not. I think most of the difference between 1 & 2 is in the tune and adding a CAI, Phase 3 also steps down to an 80mm pulley and adds a fuel pump booster as well. If you're VMP tuned now you probably noticed how much that woke up the car compared to the Roush tune. I'll bet you're already meeting Phase 2 performance. I think you could get a significant bump in power just by adding a pump booster, going to smaller pulley, and getting a tune update from VMP for 101 octane. Emissions test? unplug the pump booster, put the 85 pulley on & reflash the Roush Phase one tune. If your car isn't set up to take advantage of a higher octane fuel it wont help or hurt either, just waste money. [/QUOTE]
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Engine/Tuning
101 octane with S/C
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