Gas Fillup Accident
 

so i went to fill up my tank with gas and noticed it only cost me 32 bucks. so hell yeah i was hella stoked considering i had a little less than a quarter tank. well my bliss came to an adrupt halt when i realized i put regular, not premium. well i drove the car for a while took it up to highway speeds even passed that. launched a few times and everything seems to be ok. but has anyone else done this? does any one know if anything will happen?

The car will pull ignition timing (retard) on account of knock, you will not have maximum power, but you will be fine until you get gas again. If it really bothers you fill up again at half tank, then you will atleast have mid grade.

G

Most cars that require high octane will run on lower, just run like crap. (exactly what this dude said ^

and hey....at least you didnt put diesel in it! Ive heard of people doing that to cars.

you could also get some octane booster from autozone. not sure if the stuff really works but hey, couldnt hurt

I'm so fortunate to be upgraded to a dude now.:happyanim:

Still a cheaper fix then putting gas in a diesel engine.

octane booster will fix it !!! more powwwaaa

Or worse putting Diesel in a Gas engine (Boom).

I don't even know how that's possible since the diesel nozzle should be physically too large to fit in a regular gas filler.

if you can believe it, here in some third world states the nozzles are still the same size... LOL

I'm actually pretty sure octane booster won't do anything. 0.2 higher octane or something useless like that.

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misleading thread title is misleading.

Just avoid high rpms and heavy load (no WOT). When it gets down to a quarter tank fill up with 93, and that should put you at ~91.5.

I would need to check my owners manual again but theres a few additives it doesnt recommend. One of which i believe is a popular "Octane Booster" ingredient. I'll double check tonight after work. This is only speculation for now though!

It takes real talent (or stupidity) to put Diesel in a newer Gas engine, this is because diesel filler nozzles are purposely larger than gas filler nozzles and gas filler openings are purposely smaller than diesel ones as to NOT fit the larger diesel filler nozzles to prevent mishaps like this. So if this occurs then the person most likely has ether A.) Somehow disabled this safety catch, B.) Forced the fuel to go in the smaller hole by holding the filler nozzle up to the filler neck (this would splash fuel everywhere most likely) or C.) filled a 5 gallon gas canister with diesel and then fueled your BRZ up using the gas canister (not completely unreasonable but still fairly stupid.)

this

/thread

Yes, there are safety's in place, but even when the user does everything right, mix-ups can occur.
http://www.autoblog.com/2006/10/11/d...t-gas-station/

Different sized diesel pump nozzles? what is this witchcraft you all speak of. I used to have a diesel car ('85 nissan sentra, yep....diesel, dont ask) and the pump nozzles were the same size as a standard one, just green on the handle rather than black. at least they were all over central valley california lol

I used to put toluene in my gas tank back in the day to raise the octane. It's a paint thinner so I wouldn't recommend getting any on the paint if you go this route. Toluene is something like 110 octane so you can do the math to see what you need to get back to 93.

Just be careful... YES the car will take it like most cars will but the compression ratio is so high with this engine I don't know if there are possible complications that could arise. :eyebulge:

I'm sure lots of people have already done this in the BRZ or FRS.. they just wouldn't admit it on the forum. ;)

Don't worry about hurting the motor. It's designed with knock sensors to retard timing if any detonation is happening.. so you'll be fine. Don't take it to the race track of course.. but for normal driving you won't have to worry about anything. You don't need to add octane booster or anything else either.. I'm quite sure the engineers have designed the systems knowing that people would frequently put in the wrong octane fuel by accident.

What you should do is run the whole tank under normal driving and let us know it goes. Does the car feel low or down on power? What gas milage will you get from this tank of regular? It would be interesting to learn these things.

The dealership I got the car from actually topped it off with regular. The salesperson claimed to have double-checked with Subaru before doing so. In her defense, though, one of the 2 books does say it recommends 87 octane, whereas the other one mentions 93. Luckily for me, the car was brand new to me (nothing to compare power against) and I wasn't putting it through any kind of stress for quite awhile.

In NJ you can't legally pump your own gas. On my second fillup, the guy put in 87. with factors such as: coming from a car with half the power, first MT car, following the 4k rev limit break in and driving cautiously in general - i honestly can't tell you if the power was decreased. however, i did notice a ~5 mpg dip from my average mpg with 93 octane (31 vs 26).

Two tanks of 87 and now on second of 91, near 1000 miles, can't feel a bit of difference.

are you driving aggressively to redline in every gear?

I've pulled it to 7000 or so a handful of times after warming it up. Nothing real hard and sure no redline yet.

then how can you tell the difference between crap gas (pulled timing) and the proper octane?;)

If you only feel an octane difference at redline, then there is no point for the majority of people to use 91 or 93. The compression is the same regardless of rpm from what I understand, so the difference would be noticeable regardless of rpm, if there were one.

Educate me if I'm missing something here.

Just don't take it over 3-4k RPM and you should be fine. If I was in your shoes I would fill up at half tank and still keep it low on the RPMs

Get a few gallons of 100 octane race fuel...UNLEADED!

Octane is going to have less impact at higher RPM, because of the tendency for knock to be largely suppressed in the higher rpm. At peak torque is when I would be concerned about the timing being pulled back, as that's when the engine has the most tendency to knock.

Of course, this engine has a pretty stout powerband. Finding the area of the map where knock is most likely to occur will take some experimentation. This is what I thought was causing the dip in the powerband, under first assumptions. I figured timing was pulled back in the dip to help prevent knock under certain conditions. But I was wrong, it seems to have more to do with intake resonance...