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Old 01-27-2013, 12:04 AM   #1
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regular or premium??

Yea I have a stock plane as can be 2013 GT mustang. And I was wondering if I should use premium. Or stick with the regular fuel?
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Old 01-27-2013, 12:07 AM   #2
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Stick with regular, the new 5.0s are able to electronically adjust to a higher octane of fuel. But you still won't see anywhere near as much gain as you would with a tune.
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Old 01-27-2013, 12:10 AM   #3
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I heard you won't get the whole 420 HP without premium
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Old 01-27-2013, 12:11 AM   #4
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I heard you won't get the whole 420 HP without premium
if you are going to run 87 octane baby the car, it can run 87 octane but it is intended to run on 91 or higher.
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Old 01-27-2013, 12:13 AM   #5
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Well you won't get 420 at the wheels anyway cause of drivetrain loss. But yea you won't get the full amount of power, but it isn't a whole lot of a difference, some people will say they can feel the difference but it is usually just in their head.

---------- Post added at 10:13 PM ---------- Previous post was at 10:12 PM ----------

Simple fix.... Get a 93 Octane Race tune, problem solved lol
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Old 01-27-2013, 12:16 AM   #6
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OK cool I think I'm gonna stick with premium.
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Old 01-27-2013, 12:18 AM   #7
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That's what i would do also lol
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Old 01-27-2013, 12:19 AM   #8
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OK cool I think I'm gonna stick with premium.
while I know it is for the 2011, the engine is the same for the 2011-2013 years in everyway.

http://media.ford.com/images/10031/2...g_GT_Specs.pdf

recommended 91, but 87 is the minimum. Straight from ford for the Coyote engine.

with a compression ratio of 11.0:1 it is far safer if driving the car like you stole it and revving it high that you run 91 or higher.

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Old 01-27-2013, 06:36 AM   #9
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Premium.
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Old 01-27-2013, 06:53 AM   #10
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I have ALWAYS since day 1 have used 93 octane premium.
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Old 01-27-2013, 06:56 AM   #11
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I have ALWAYS since day 1 have used 93 octane premium.
Same here, pinging would make me cry.
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Old 01-27-2013, 07:35 AM   #12
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I have ALWAYS since day 1 have used 93 octane premium.
That's all I use, SHELL
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Old 01-27-2013, 09:48 AM   #13
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Quote:
Originally Posted by Soccerluvr4 View Post
Stick with regular, the new 5.0s are able to electronically adjust to a higher octane of fuel. But you still won't see anywhere near as much gain as you would with a tune.
Quote:
Originally Posted by Soccerluvr4 View Post
That's what i would do also lol
What? You just contradicted yourself.

Either way I would stick with at least 91, since that's what this motor is really designed for. At 11:1 CR I would never recommend 87 or even 89, yea the motor can adjust timing if knock is detected but you're far more likely to screw something up if you use lower octane fuel. These cars are known to lean out in the upper rpm range even on stock tune.
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Old 01-27-2013, 09:52 AM   #14
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while I know it is for the 2011, the engine is the same for the 2011-2013 years in everyway.
Not quite, there has been a big debate as to when the piston oil squirrels were deleted, also the pistons are slightly different where they use more ring skirts I believe. Different timing tables and tuning also.

But for our purposes in this thread the motor is the same
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