What quarter mile time for a stock,new 21' ?

[21 antimatter]

I'll give that a try

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[Rental18GT]

Anything in the mid-low 12 second range is realistic, my 301a 10 speed with 3.15 gears ran 12.36 @ 116mph bone stock and street tires on a warm night. Went 12.04 @ 118 with some drag radials, little bit better weather, and a few pounds lighter.

 

[victory-rc]

My goal is to get the efco New Jersey this summer, looking forward to the day actually.

 

[gimmie11s]

Recently ran a 12.63 at 112.8mph with a new all stock 21 GT premium with the 10AT, 3.15s on 87 octane. 18" Pirelli P Zero AS tires inflated to 32psi. Made 8 passes total. Ranged from 12.63-12.95. Drag strip mode, traction control on for safety, manually shifting with paddles netted the best ET for me. Just learning the car. I've owned a 1989 GT, a 2006 GT with a Ford Racing whipple kit, a 2012 Boss 302, and a 2013 GT500. Enjoyed all of them. So far I like the 2021 the best. My favorite car of all time so far. American Made Muscle.

87 octane?? lol....with 12:1 compression, that is the last thing you want to do my friend.

I'd bet you pick up 5 mph by running premium fuel.

 

[21 antimatter]

I do plan to see what difference running 93 octane will have. I don't have an issue using 87 octane, I trust the knock sensors and the Ford engineers to make sure I won't harm the engine. If 93 octane was required it would say so in the manual.

 

[victory-rc]

It says to use 91 octane in the manual

 

[21 antimatter]

my manual says 87 octane is ok

 

[pt's21]

It will run 87 but will be down on power. The ECU will pull some timing because the engine will knock on 87.

I'm running a 93 octane tune, and will run 93, as recommended. If gas continues to go up, I'll put my GT back to stock tune and run 91. Every knock has the potential to pit the piston face and combustion chamber. Not fatal, but still not good if it happens a lot.

 

[NASteve]

my manual says 87 octane is ok

Yes you can use 87 octane but to race on 87 octane is not recommended, you are putting the engine under severe load and premium is recommended to keep it out of detonation.

 

[LSchicago]

my manual says 87 octane is ok

Just because you can screw a hooker or random hook up without a condom doesn't mean you should. A little extra expense for protection goes a long way!

 

[21 antimatter]

My suggestion to you is to move along.

Just because you can screw a hooker or random hook up without a condom doesn't mean you should. A little extra expense for protection goes a long way!

 

[LSchicago]

My suggestion to you is to move along.

I'm just not sure why anyone would want to use 87 in a GT. Only way I'd do that is if nothing else was available.

 

[21 antimatter]

I'm just not sure why anyone would want to use 87 in a GT. Only way I'd do that is if nothing else was available.

I don't mind losing a little horsepower due to timing being pulled by the ECU. I have used 87 in other "premium" vehicles that do not specifically require 91 or 93 octane. I only use 93 octane (highest available in PA) when the manufacturer requires it, or when its really hot and the engine will be subject to possible detonation should a knock sensor fail or some other possibility. At 70 cents per gallon more, premium is just a waste of money unless its absolutely necessary. $0.035/mile is not insignificant, wasting that amount of money on fuel that isn't absolutely necessary will be $3,500 over 100,000 miles...that's 3 complete sets of tires. I do use premium when it is necessary, like in the summertime if I will be doing spirited driving, or if I would tow something. I always read the owners manual carefully and do what the manufacturer says and I have NEVER had an engine issue. Like I said, I trust the engineers.

 

[NASteve]

I don't mind losing a little horsepower due to timing being pulled by the ECU. I have used 87 in other "premium" vehicles that do not specifically require 91 or 93 octane. I only use 93 octane (highest available in PA) when the manufacturer requires it, or when its really hot and the engine will be subject to possible detonation should a knock sensor fail or some other possibility. At 70 cents per gallon more, premium is just a waste of money unless its absolutely necessary. $0.035/mile is not insignificant, wasting that amount of money on fuel that isn't absolutely necessary will be $3,500 over 100,000 miles...that's 3 complete sets of tires. I do use premium when it is necessary, like in the summertime if I will be doing spirited driving, or if I would tow something. I always read the owners manual carefully and do what the manufacturer says and I have NEVER had an engine issue. Like I said, I trust the engineers.

Now that makes more sense, when you aren't putting it under load then octane doesn't matter, but if you are racing then I would highly recommend premium octane.

 

[Grayghostcoyote]

I’ve personally ran 11.8s in a quarter on stock 255s with a tune intake throttle body and 3inch cat back custom with a double x pipe and muffler less …. 10speeds eat bro

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