Ok I am going to switch to Premium at Costco. Their premium is the same price as the Shell Regular. Plus there whole setup is new so their tanks should be free from most gunk.
I remember when I bought it the son of the owner said he thought that his parents ran premium in it. Is there any way to verify if the stock tune has been modified?
Also I have always believed if you run premium in an engine that is designed to run on regular that the engine would develop more carbon build up do to an incomplete burn.
Stage one is n/a.
I get what you're saying Boss, but the ecm is probably pulling timing with 87 octane. Which means premium will prevent timing retard. Yes/no/maybe?
Until the 2008 Bullitt the knock sensors didn't cause the computer to do anything. No other Mustang until 2011 think used the sensors to adjust for octane.
So if you have a 2005 to 2010, running premium without a tune does nothing but lighten your wallet.
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I think what he meant is that until the Bullitt timing was not advanced when higher octane was sensed. But it is confusing. Of course the knock sensors will pull timing from the 2005 4.6.Why would Ford bother fitting knock sensors if they weren’t using them somehow?
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I’ve had mine since 2008, and this is the first I’ve ever heard that it will not advance timing. I do know for an empirical fact that I got better fuel mileage on premium fuel. It was not a computer calculated mileage, it was physical hand calculated mileage over several tanks of both types of fuel. That alone would make me believe it was able to advance timing based on fuel.
Previous to that I had a 1998 XLT Explorer 4x4 (SOHC V6), and it got better fuel mileage on regular. That’s certainly not apples to apples, but I do realize some will run better on regular fuel.
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Stage one is n/a.
I get what you're saying Boss, but the ecm is probably pulling timing with 87 octane. Which means premium will prevent timing retard. Yes/no/maybe?
The 2010 GT has a different intake manifold and cold air inlet than previous 4.6 GTs. That allowed Ford to tune a little more power into the Mustang. 315 HP and 335 Lb torque. You can datalog the engine and see the knock sensors at work and the computer most certainly pulls ignition timing when knock is detected. Octane level has a direct effect on this. Yes, higher octane fuel allows you to make more power if you can capitalize on it.And here is something I don't understand. The 2005 4.6 has knock sensors. But I have read that only the 2008 Bullitt can benefit from running premium because their system will up the timing with premium. Like wise the 2010 4.6 and the Bullitt that have 315hp will retard the timing if regular is used.
I understand octane and what it does. I am thinking more and more that I just got a bad tank of gas. Everything I have read says that the 300hp 4.6 runs fine on regular and anything else is a waste of money. I have also searched high and wide and everything I have read says the 2005 Stage 1 Roush motor is a stock GT 4.6 with the only modification being the Roush mufflers.
The 2010 GT has a different intake manifold and cold air inlet than previous 4.6 GTs. That allowed Ford to tune a little more power into the Mustang. 315 HP and 335 Lb torque.
Will the regular overtime do damage to the engine