What octane are you using in the GT? - Ford Mustang Forum
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post #1 of 21 (permalink) Old 06-23-2010 Thread Starter
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What octane are you using in the GT?

Since the 5.0 can run on regular or premium gas, what are you all using? Let me guess - 9 out of 10 use premium.


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post #2 of 21 (permalink) Old 06-24-2010
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94 octane at the one place but when its closed i run the 93 oct


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post #3 of 21 (permalink) Old 06-24-2010
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I will use premium, but if Wannapony (who started this thread) does not mind, could I also ask what folks think about octane additives?

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post #4 of 21 (permalink) Old 06-24-2010
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isn't there a sensor? you lose HP if the octane is too low but it should be fine for the engine, right?
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post #5 of 21 (permalink) Old 06-24-2010
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as far as the additives they dont actually raise your octane 1 point or 5 points they only add .1 or .5 points just depending on which octane booster you run. I dont have a new 2011 mustang but i have a 93 gt and i only run 91 octane in it but soon ill have to look around for places with 93 octane around here
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post #6 of 21 (permalink) Old 06-24-2010
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I "hope" to use 91 someday! Probably try some lower just to see how it performs (SOTP & MPG) for comparison.

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post #7 of 21 (permalink) Old 06-24-2010
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Best stick with premium

You could try some 87 octane but with the automatic (that's what I have), I noticed a slight hesitation and power loss at low rpm. Like right off idle and at around 30-35 mph when it is lugging along at 1000 rpm. The intake drone inducer would cackle a bit as the throttle is pressed- slight hesitation and then it would accelerate. The outside temps were pretty high around 95-100 degrees.
Premium 93 cured these symptoms in less than 25 miles. My car was filled with 87 from the dealer new. I have only run premium since.
Guess maybe the timing and cams retard under these conditions with the 87. Car runs great with 93!!
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post #8 of 21 (permalink) Old 06-24-2010
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93. because sunoco no longer offers 94

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post #9 of 21 (permalink) Old 06-24-2010
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I had a 2010, and I noticed no difference on the butt dyno when going from 87 to 93 octane.

However, with the 2011, I noticed a significant difference -- well worth the price to put 93 octane in there.
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Well I just filled up for the 2nd time at 87. I am going to test this again for the second week. Gas mileage is still up in the air since I have been hot roddin it a little and then taking it to shows and everywhere i go and then driving to work. i am doing my last 87 round this week. then i am switching to the premium grade. we will see if there ia a difference that i notice.
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It is much better to run 93 because it keeps your engine much cleaner inside and also it makes my 5/0 run like a swiss watch.
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Quote:
Originally Posted by kevin macia View Post
It is much better to run 93 because it keeps your engine much cleaner inside and also it makes my 5/0 run like a swiss watch.
Higher octane does not keep an engine cleaner... it just burns at a higher temperature.

Let's be careful throwing this stuff out there/:laughlitt

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In Arizona Premium is 91 at all stations I wonder what people do in that situation?


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Quote:
Originally Posted by cidsamuth View Post
I had a 2010, and I noticed no difference on the butt dyno when going from 87 to 93 octane.

However, with the 2011, I noticed a significant difference -- well worth the price to put 93 octane in there.
On the 10 the 91 octane gives you an extra bit of tq to 335ft/lbs and no official horsepower rating (although one can assume if it bumps the tq up by 10 pts then the HP should be around 325 on 91). There is no performance increase going to 93oct.

On the 11 you only get 377ft/lbs tq and 402hp on 87 so its a SIGNIFICANT loss of performance from the 390ft'lbs and 412hp they rate it for 91 (again i dont think they rate for 93 as its not even legal in california??).

Both models have dual knock sensors and will adjust for cheaper gas to prevent knocking. Both run better on premium but the 11 runs MUCH better on premium.

Temperature has nothing to do with it. Neither does clieanliness. Its more complicated than that. Basically though...it has to do with the more aggressive engine timings and the higher octanes ability to not mis-fire knock at the more aggressive timings/compression speeds. Burns "faster" might be a more appropriate analogy.

According the super tuner Chris.....a 93 octane tune on a 10 would push the hp closer to 340 and a 93 only octane on an 11 would be good for something like 430+ But if you get the tune and run 87 your kinda screwed as your engine will be knocking like crazy which can be damaging.

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Does anyone run 87 consistently? I will eventually run 91 but with my current drive 87 is sometimes a better choice.

Even though Ford claims you can run 87, does anyone believe it may cause engine damage?

By the way I'm purchasing a 2011 5.0 MT with 3.73


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Last edited by mustang6767c; 06-25-2010 at 03:51 AM. Reason: By the way I'm purchasing a 2011 5.0
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