DYNO TESTED (87 vs. 91 Octane) - How much HP gained? // 10th Gen (2018+) Honda Accord 2.0

I really enjoyed this! Glad someone is looking into this and showing the work behind it instead of just posting numbers!

Hondata did a dyno to on a 2018 2.0t MT… they say it gained 9hp with 91…. I’m confused

The plots only show 3500 and up. Octane makes the biggest difference at lower rpm and high torque load where preignition is the limiting factor. That's why high octane makes some engines feel more responsive even if peak horsepower isn't much different. That might be hard to measure on a wheel dyno if you don't have a manual transmission.

I owned my 2018 2.0t 10AT for about a month now and clearly the car is meant for 91 and its not even close.While yes it can run on 87,you can tell its not as responsive as it is on 91.The car feels much better to drive on 91 also being more healthy for the engine.

I owned two CTRs before buying a 22 Accord 2.0t. I plan on eventually doing a Hondata/Phearable Stage 2 tune with stock parts and just use Calif. 91 octane in the meantime. The stock car pulls pretty hard even stock and is impressive acceleration wise already compared to the CTR. I’m looking at long term reliability of the 2.0t so an extra 20 cents per gallon is worth it to me for when I drive my spare vehicle. Thanks for the informative video!!!😁👍

The fuel itself doesn't add power, timing adds power. The more advance in your timing you can safely run without detonation, the more power you can make. Higher octane fuel is actually less volatile so it allows higher compression and more aggressive tunes. Low octane ignites easier so in a high compression engine it will detonate before the pistons reach TDC, Pre-detonation. The computer will adjust the timing to the fuel and give you more power from the timing advance that higher octane allows. The computer will set more aggressive parameters in the tune for higher octane and you usually will feel a nice bump up in the low and midrange power. You can get up to about 10 to 20 more hp for every 2 degrees of timing advance, depending on the engine size and design, altitude etc.

Very simple folks... Octane is based on compression ratio no I don't give a crap what the ecm can accommodate for run the octane based on compression ratio and boosted or na.

I think its important to note that a lot of vehicle KNOW what gas you put into it and adjust accordingly. 91 octane into any 87 octane wont increase any power unless the engine knows that it can swap over to its factory 91 octane tune

Using 91 bring better engine life and kepts everything cleaner inside so tech just speaking even if you aren’t getting the power you desire out of 91 your still helping your engine

Thank you! I currently own a 2022 Accord Sport 2.0T and had use 87 on my car. I also ran some research online and putting 91 doesn't really show a massive difference than putting 87.

I have a 2020 accord 2.0 I have no mods and planning on leaving it stock. Should I put 87 or 91 fuel ⛽️? Thank you

I just bought an Indian Scout Rogue. The sticker on the fuel tank says to put 91 octaine minimum. Never even bothered to check fuel differences until now, always just put the cheap stuff in my car (Toyota Corolla) and my old bike (Honda Rebel 500)

Wait, can you run 87 octane on a Ktune? I am interested in getting a Ktuner, but don't want to run Race tunes, just a little more aggressive tune then sport.

Have you dyno the accord by swapping with a type R turbo? Would it make any difference? How much power can I get by k tuner v2 with front pipe?

Not a placebo. Put in 92 and the car is definitely more responsive. Been using 87 on our 21 Touring with 13,xxx bought brand new this whole time. I always thought it was suspect in the manual when it said 87 “or higher”. I guess if Honda officially recommended 91. It would turn off potential new Accord owners so, they say 87 or higher. Higher being a little more oomph. Definitely staying on 92 now. It’s worth it imo for the 20 cent difference per gallon.

Nice! I bet if the Accord 2.0T was driven around for a while on 91 octane to allow it to adjust to the higher octane, and then it was fully cooled off, then run on the dyno again like the first run using 87 octane, I bet the numbers would have been even higher. Where I live in GA, we have 93 octane... I also installed drop in K&N Air Filters into my naturally aspirated '15 Infiniti Q50 3.7 RWD, and we all definitely notice a difference in the sound and acceleration... Especially above 4000 rpm. It felt like the difference between WOT during an 85 degree day, versus WOT during a 45 degree day. Very noticeable, surpringly. Now, in a forced induction vehicle like the Accord 2.0T that responds to mods better than N/A, a K&N filter combined with 91 octane, or 93 octane where I live, would probably be a very noticeable difference in acceleration vs stock when it was on 87 octane. I'd love to know how much it gains on both 91 & 93 octane with a K&N filter. Anyway, thanks for the great video!

Love your videos!

Could be CO has better quality ⛽️ than MA.

Thanks! Nice video))

It's called power under the curve. That's where most people drive!

Good test! Thanks as always.

Glad to see you got it right this time I knew this all along. Last year's video was a sham. It's a fact that turbocharged cars generally will produce more horsepower and torque on a higher octane gasoline. Good video!

Makes a difference if the manufacturer says to use 91. The knock sensor messes with the timing with lower octane from what I gather.

This should clear up some internet arguments. Have heard so often that octane makes no difference on a stock tune blah blah. 😐

Thanks for the test! I've always run 87 in my car because I don't have any performance mods, but good to know I can get more performance with it running at 91!

Great video

Finally the argument can be put to rest in the accord FB groups lol. Proof is in the pudding. Gas quality can cause variances but ford cars for example make advertised Hp on 91-93 fuel.