Octane for gt dd?

[Armen]

Here in Ontario, I use Shell 91. I'm not sure about other areas, but here it contains no ethanol. When I've stored my cars, I always use this fuel. No stabilizer. No issues, ever.

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[EFI]

The difference between 87 and 93 isn't very significant when you're talking about an NA motor.

You must not know much about motors with that statement. Try putting 87 octane in a 14.1 compression NA motor and see what happens :frusty:

Not that I'm comparing the stock Coyote motor to that, but your statement is vague and partially incorrect. On a stock motor with moderate compression the difference between 87 and 93 *may* be insignificant...but just because a motor is NA doesn't mean it can run 87 just as well as 93.

 

[2015 Silver GT]

Not that I'm comparing the stock Coyote motor to that, but your statement is vague and partially incorrect. On a stock motor with moderate compression the difference between 87 and 93 *may* be insignificant...but just because a motor is NA doesn't mean it can run 87 just as well as 93.

Well Ford says you can. And they build the motors.;)

 

[Steeeliskt]

The difference between 87 and 93 isn't very significant when you're talking about an NA motor. Stick to tier 1 gas stations and I bet you won't notice one iota of difference. If you get a bad batch of 87 your ECU will sense more knock and pull some timing which will in turn reduce available power but unless you're running a forced induction with a 93 tune, you don't need it.

I never even thought of this. After I went through the first tank of gas from dealership I put 91 one in (in Cali... I had no idea 93 was common place elsewhere). I had to go back to the dealership when that tank was done and they filled it up for me but I knew they were putting 87 in and I could certainly feel the difference. Maybe it was a shitty batch of 87 or from a cheapo gas station. I guess I will try another tank of 87 and see if I notice any difference but the price difference really isn't that big of a deal, even looking at year end figures.

 

[Evolvd]

I never even thought of this. After I went through the first tank of gas from dealership I put 91 one in (in Cali... I had no idea 93 was common place elsewhere). I had to go back to the dealership when that tank was done and they filled it up for me but I knew they were putting 87 in and I could certainly feel the difference. Maybe it was a shitty batch of 87 or from a cheapo gas station. I guess I will try another tank of 87 and see if I notice any difference but the price difference really isn't that big of a deal, even looking at year end figures.

Which is odd considering that CA is such a nasty state to deal with when concerning emissions. You'd think they would regulate more consistent fuel mixtures.

I've run a few tanks of 87 from my local Tier 1 stations and haven't noticed a difference in my butt dyno. I'm sure someone, somewhere, has done actual dyno testing to see differences between octane ratings but there are so many variables associated with such a test that it may be difficult to detect what the source of any differences are.

 

[craigsix]

Which is odd considering that CA is such a nasty state to deal with when concerning emissions. You'd think they would regulate more consistent fuel mixtures.

I've run a few tanks of 87 from my local Tier 1 stations and haven't noticed a difference in my butt dyno. I'm sure someone, somewhere, has done actual dyno testing to see differences between octane ratings but there are so many variables associated with such a test that it may be difficult to detect what the source of any differences are.

bama did a dyno with 87 and 93 i think.

 

[Cascadia_302]

I see some here still confuse higher octane fuel with higher quality fuel. For my stock NA/no tune car if I had to choose between a budget gas with 91-93 octane and a top tier gas with 87 octane I would use the top tier lower octane fuel. But since I don't need to choose I run 92 TT (highest octane for my area).

http://www.toptiergas.com/

 

[King_V]

bama did a dyno with 87 and 93 i think.

Are there graphs of this? I'm really curious as to the results!

 

[TrackpackGT]

As per the owner's manual, use 93 for towing..... It says 87 octane otherwise. I have a SCT on mine, so I run 93. It does have a 87 octane feature in the SCT, maybe I'll give that a try.

 

[Evo_Rob]

As per the owner's manual, use 93 for towing..... It says 87 octane otherwise. I have a SCT on mine, so I run 93. It does have a 87 octane feature in the SCT, maybe I'll give that a try.

Are you just using the preloaded tune?

 

[TrackpackGT]

Yep. Just downloaded their most recent update, then downloaded the tune.

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