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Discussion Starter #1
91 or 93 octane? 2011 wrx, mod plan is cobb ap, thanks..
 

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I 'am running '09wrx AP 93 oct, wondering the same thing??? running good thoe
 

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isn't 91 and 93 relatively the same thing. Some places like California just use 91 I thought? I've run both in my Si and didn't notice a thing
 

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COBB makes OTS maps for both fuel grades, match the Fuel grade to the map. In general higher octane is better for our cars, if you have 93, use 93
 

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91 and 93 are not the same. Use the highest octane available in your region, 91 at minimum. Forced induction engines are happiest with a higher octane.
 

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91 and 93 are not the same. Use the highest octane available in your region, 91 at minimum. Forced induction engines are happiest with a higher octane.
they are both satisfactory for a car that requires premium I should say:wiggles:

I've only used 91 a few times, doesn't some Pilot's use 92?
 

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If you are tuned with the AP for 93,use 93,if you are tuned for 91 use 91.Its as simple as that.

Depends on what is available in your area.

For example,in my area I do not have 91 ,only 93.
 

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Sasquatch said:
Use the highest octane available in your region, 91 at minimum.
This.

rage-wrx said:
If you are tuned with the AP for 93,use 93,if you are tuned for 91 use 91.Its as simple as that.
Not necessarily. You could use the detuned 91 map and use 93 for better knock threshold.

rage-wrx said:
For example,in my area I do not have 91 ,only 93.
Do Sunoco stations in your area not have both 91/93? They're the one chain here that carries 91; every other one carries 93 only.
 

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Discussion Starter #10
thank you all for the feedback, i kinda know the answer to this, just want know what others think and in my area it's 10 cents difference and both available i'd probably go with 93 then..
 

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If your car is stock you can simply run 91.
 

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Do Sunoco stations in your area not have both 91/93? They're the one chain here that carries 91; every other one carries 93 only.
Yeah,you asked me this before.I don't have many Sunocos around here.Just one & its a bit out of the way for me.If I'm ever in the area I'll check.
 

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Discussion Starter #13
If your car is stock you can simply run 91.
stock for now, plan to cobb ap when i gather enough donations..:wiggles:
 

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stock for now, plan to cobb ap when i gather enough donations..:wiggles:
OK, if/when you are running another map, then opt for the highest octane available and use a map that covers at least that octane. For now anything 91 and above will work OK in your car.
 
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