2021 Stock: 91 or 93 octane?

ArthurWick

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Any benefits using 93 octane on stock car vs 91 octane? I know that it does makes a difference with a tune but what about stock? 2021 having lower compression ratio, does it makes any diff 93 vs 91. Thanks guys!
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Dannyvandelft

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Any benefits using 93 octane on stock car vs 91 octane? I know that it does makes a difference with a tune but what about stock? 2021 having lower compression ratio, does it makes any diff 93 vs 91. Thanks guys!
If you have it available, run it. Couple bucks a tank for a little extra piece of mind, maybe a little more power, so why not.
 

Midlifecrisis

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If your driving ā€œspiritedā€ and the air temps are high (i.e. summer) I would think there could be some benefit to 93 as their is less of a chance the timing will need to be trimmed back.
 

65sohc

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Most manufacturer horsepower ratings are based on 93 for their performance vehicles. For example my GT350 was rated at 526 hp*. The * would refer the reader to to a disclaimer saying that the rating is lower on 91.
 
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ArthurWick

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Most manufacturer horsepower ratings are based on 93 for their performance vehicles. For example my GT350 was rated at 526 hp*. The * would refer the reader to to a disclaimer saying that the rating is lower on 91.
Thereā€™s no 93 in my area but I plan on stocking some octane booster and add it after every fill up with 91 to get to 93 level.
 

Frosty

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Be careful with octane boosters as they can damage your O2 sensors earlier. At least some back in the day did, but donā€™t know if they have gotten any better.
 

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That seems like a lot of effort for possibly questionable gain on a stock car. I would just run 91 on a stock tune :dunno:
 

65sohc

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That seems like a lot of effort for possibly questionable gain on a stock car. I would just run 91 on a stock tune :dunno:
I agree. On the stock tune it's probably about 10 hp difference.
 
 




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