Do you use 93% octane
 

What will 93 get me. It's in most stations here

Pretty much what the spec sheet says. That's what the car was designed to run.

I don't use 93 simply because availability is hit and miss where I am. 91 is way more available, so I have a 91 tune loaded on my car

Insurance on hot days when running hard, maybe a very small power increase, certainly not enough to feel.

I've used nothing but 93 octane since I bought mine 3 years ago, hasn't had any issues being driven very hard in 100F weather. I'd say its worth the few extra cents, especially on track days.

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Moar Powah!

93 Isn't available where I live.

Also -- I never noticed octane was a percentage.

Dude seriously? You asked the same question in another post and people answered myself included, the manual calls for it when available, only if it is absolutely not available do you use 91 (bearing of course if you have a 91 tune) also you've been using 87 for quite some time correct? :


http://i.imgur.com/k4KZnyD.png

93 octane will get you a car that functions as designed from the factory. Running 91 octane on the stock map is not going to hurt anything but most people will notice a power decrease. Running less than 91 octane will greatly increase the chances of your engine experiencing knock. While not immediately fatal to the engine, it will harm it over time.

No offense meant but you've got to pay to play. The FA20 engine is a high compression motor that cannot run on low octane fuel without experiencing predetonation. It's a physical reality.

If you must run 91 octane, remapping your engine using OFT, EcuTek or similar will help compensate for the timing changes made by the stock map to compensate for the 2 octane difference.

At a minimum, please read the owner's manual or at least the sticker on the inside of the fuel door.

I totally agree with this as well, the sticker on the gas door is even saying put premium only. However the issue is in some places "premium" means 91 and not 93 however if OP is worried about damage from 91 he should worry not as you said, but what he should worry about is the fact he kept putting 87-89 octane in the car for quite some time. This is straight from the manual:

http://i.imgur.com/0Igt9GI.jpg

Well, it's not!

Bottom line as other posters have mentioned: read the owner's manual. Use 93 octane if you have it available, us poor Californians without 93 can use 91 without harm to the engine.

It may be ... down in Georgia .......

:scared0016:
(humfrz)

First off why do you continue to copy and paste my post FRSBRZ? It's weird and you should certainly have something better to do besides follow my post around.

Secondly Ive not even had the car quiet sometime. I've had it almost two months. I'll just drive the gas out and I'll put high octane in, no big deal

To the others, really if you have nothing of importance to add to my post, please don't reply. As I'm only looking for useful information:)

And for the ones with useful information Thanks!

Can you have 93 octane in your tank but on a 91 map?

:laughabove:

Yep.

I tend to just throw in the highest available where ever I happen to be when I need gas. Since I burn through two tanks a weeks the locations can be pretty random and once can be 91 and the next 93 or even 94. Possibly because my ECU never gets a chance to level out on one level of fuel I never notice any difference between one tank and another regardless what level I pump into it. That is the beauty of a ECU that learns since it will adjust to whatever the situation is, give you the best for what you have and reduce the risk of issues.

True, I just use 91 mostly since it's a bit cheaper and tends to be everywhere(even up north at the cottage, gotta love ATV/Snowmobile country). I've been borrowing my dad's Costco card and filling there for like 92 cents/litre for 91 octane, lately.

Which is better? Run 93 with 91 or 93 map?

93 with 93 map will better, especially if you're running FI. But its dangerous to use a tune that depends on 93 with only 91.

On a stock car with stock tune, it wont really matter.

Do you use 93% octane
 

I'm on oft. I usually pump 93 and run 91 map.

As others have said, running a higher octane fuel on a map set up for lower octane fuel isn't going to cause a problem. Obviously you won't be getting the most out of the car; however, it certainly won't damage the engine. Depending on the general quality of gas where you drive, where you purchase fuel, and how closely the fuel quality regulations are followed in your area, running the 91 map might actually be the optimal choice...

Yeps ^

Thats what I meant. 93 gas on 91 map is fine.
91 gas on 93 map is a bad idea.

Sorry never used 93% octane, have used 93 octane but never 93%. I use 94 (Canada we have 87,89,91 and 94)

93% in Georgia I believe is the percentage of siblings involved in romantic relations not the octane percentage of fuel
:scared0016:

Although I would not take the chance of running 91 on my 94 map because you know... boost

Ya boosted or tuned are a totally different ball game.

Yea lol, pretty sure tcoat was talking about just the stock tune. Any custom tune thats meant for 93 or above shouldnt be used with anything below.

Stock tune is basically mapped for 91 I assume, and 93 just gives you more of a safety net.

We have 93 around my parts as well as all the rest. There is even one station I know of with 100 but you need a special card to buy it.

Hey now! I'm from Georgia and it isn't that ba... Wait. It probably is that bad. Probably why were ranked in the high 40s every year for the best education too... :(

I know he was, I like to brag in a passive manner :)

at least you have the Georgia peach studios/incentives so you do have a lot of creative mediums around there.

Well, I decided to do some research and we're 12th in one study about AP scores, and middle from another study. I could have sworn we were doing much worse lol. My high school was pretty sorry, but you can get an awesome college education.

Yeah I'm pretty sure Georgia has invested a shit ton in education in the last decade.

Because you keep posting ridiculous threads where the answer has already been presented to you?:lol:

Seriously dude I don't keep up with what I post or when. I just post when the thought hits me.

But thanks for keeping up!

It's because of the scandal where a lot of atl schools were passing failing gate way test scores to bulk up their numbers. Without that pass you do not graduate.

I just want to laugh at the fact that everyone thinks they are actually getting 91 or 93 or whatever octane out of the pump every time they go to a gas station, and that they are worrying about whether 91 vs 93 will damage their engine.

-alex

Oh enlighten us then great all knowing one 😜.

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Everyone's stuck on 91 or 93 octane, when in reality there's no way to conclusively ensure that you will get whatever octane you are putting in every time.

A lot has to do with consistency and quality of fuel delivery, from the refinery to the supplier to the quality of the fuel tanks at the gas station and everything in between.

Nitpicking 91 vs 93 is very pointless and focusing too much on details that won't matter. Modern engines will already account for variations in fuel quality by adjusting timing based on engine knock.

-alex

But those details do matter. Even though it may not be perfect 93 or perfect 91, there is going to be a noticeable difference in performance when running either fuel.

And you just pointed out what I am trying to say... people are so stuck on this "91 vs 93" debate that they are complaining about something they have zero control over.

If you have your engine properly tuned, it will maximize power when running 93 octane but won't cause any harm if you somehow run 91 octane or end up with "sub-93 octane gas"

Being stuck on the smallest possible detail doesn't do anyone any good, especially in a street car.

-alex

But the 'smallest possible detail' causes a world of difference for some people. It won't cause harm for a little while, but it will decrease power output. And with our cars pushing 200 at the crank, you can't really afford to do without power, no matter how small the detail is.