91 Grade fuel?

[codymclelland]

A friend of mine decided to try putting 91 grade fuel in his Jetta that is graded at 87. After about 20 miles, the computer adapted and the timing advanced and now it roars! Would the same be true of the Yaris? Would the computer adapt or would this somehow be bad for the engine?

[1NZYaris1]

some say yes and others say no , me i say yes it will and does ,
but i only have a 1.3 not the 1.5so :iono: try it and see.

[severous01]

umm....no

simple fact that the ecm controls the timing, not the fuel. timing is pre-determined to be whatever manufacture programmed into the ecm. the one and ONLY thing that will change the timing other than throttle is the knock sensor. and this will retard timing, not advance.

now...if you have a programmer, that's a different story because you're changing ecm programming.

you need to do a wiki search on octane or fuel ratings. grade of fuel does nothing unless you're supposed to be runnin 91+ and ur not.

[Kaotic Lazagna]

Nope, it won't. I try to run premium (Chevron) at least once a month for cleaning purposes. Never noticed any changes in performance. Simple fact is that if your car can't appreciate the added octane, it won't do anything with it.

[battleversiontc]

i run 91 in my tc and its rated for 87 and it actually runs better on 91 then on 87 same as my yaris i run 91 on it to it runs better then on 87 it does help a little bit and it does change anything better gas does make a difference but a very little difference but some notice it some dont

[Deltasix]

Nope, it won't. I try to run premium (Chevron) at least once a month for cleaning purposes.

Do you have any info to back up the fact that this actually cleans out the system? Just wondering, because I've seen a lot to the contrary.

As to the original question, I've filled my tank up with 93, no difference whatsoever.

[Kaotic Lazagna]

Do you have any info to back up the fact that this actually cleans out the system? Just wondering, because I've seen a lot to the contrary.

As to the original question, I've filled my tank up with 93, no difference whatsoever.

I actually don't, I'm just going by brand name (I did an experiment with Safeway vs Chevron with my GTI, but using 87 for both, and got horrendous FE with Safeway). But then, there are my Suby friends who swear against Chevron because it actually messed up their engines. Who knows, may be those "cleaning additives" in Chevron are bad for boxer engines?

[Aothachos]

omg this was posted in general which one to use 91 or 87 lol i use 91 all the time hands down

[severous01]

i run 91 in my tc and its rated for 87 and it actually runs better on 91 then on 87 same as my yaris i run 91 on it to it runs better then on 87 it does help a little bit and it does change anything better gas does make a difference but a very little difference but some notice it some dont

it's all in your head or you got problems that need to be fixed with pre-ignition...or knock


read:
http://en.wikipedia.org/wiki/Octane_rating

http://www.answers.com/topic/octane-rating-1

http://www.associatedcontent.com/article/296800/what_does_gasoline_octane_rating_really.html?cat=2 7

http://www.rpmeng.com/octane.htm

[battleversiontc]

can you prove it not unless theres a dyno chart plotting two different octanes then all the words that someone writes just means bullsh!t to me not unless is proven in numbers on the same car with a base of 87 octane. and it aint in my head the cars performance is better and im know for a fact i dont have problems with my tc or the yaris. if a car that is rated for 91 octane puts 87 octane in there is a performance decrease as well as knock but the knock sensor will pick that up and the ecu will adjust timing to prevent the knock so there for 87 octane upgrading to 91 octane in a car rated for 87 performance will increase such as accleration because timing will then advance as the sensors will adjust to the change of the c02 levels in the exhaust there for increasing performance. if there was no need for higher octanes we wouldnt need em and every car would use the same octane waste money and time to develop different octanes if thats the cause its all in my head sorry maybe you just getting alittle to much sun in texas

[Kaotic Lazagna]

Here you go: http://www.youtube.com/watch?v=dDHwCWdrtdg&feature=related

Very good experiment comparing different octanes, and proof that premium gas will not gain you anything in terms of performance.

[battleversiontc]

if you watched the very end portion he did say that higher octane will give you more performance and 1 out of three cars never made performance so you just proved me right

[Kaotic Lazagna]

wheres the proof when two of those cars are turbod and they made more horsepower on higher octane then reccomended so you just proved me right

Yeah, but our Yarii (at least mine) are not force fed. It would fall under the same category as the Clio, purely made for economy. "You guessed it, 81 brake horsepower."

I was never claiming that premium gas will not make any difference on higher end, performance oriented cars. But suit yourself, keep spending more for premium gas. And if you really want to prove us wrong, conduct the same test that they did.

[Kaotic Lazagna]

if you watched the very end portion he did say that higher octane will give you more performance and 1 out of three cars never made performance so you just proved me right

Yeah, those other cars are PERFORMANCE cars, not economical cars. I don't know about you, but I don't consider our Yarii performance cars. We're basing this thread on the Yaris, an economical car. And as in that video, the economical car did not make extra power with higher octane gas, so you're proving me right.

[Kaotic Lazagna]

http://www.yarisworld.com/forums/showthread.php?t=17495&highlight=premium

[Kaotic Lazagna]

But hey, it's not our money. Do what you like. If you feel a performance gain, good for you.

[battleversiontc]

ok try a different na make that are economy friendly then to prove me wrong cause one car from a different make doesnt do you know good in here find one with a yaris in it then post it other then that dont compare cars to another cause there just not the same. fine you didnt prove me worng or right. but not unless you come across a yaris video since thats what its based on then dont say nothing until you can prove me wrong or right

[Kaotic Lazagna]

ok try a different na make that are economy friendly then to prove me wrong cause one car from a different make doesnt do you know good in here find one with a yaris in it then post it other then that dont compare cars to another cause there just not the same. fine you didnt prove me worng or right. but not unless you come across a yaris video since thats what its based on then dont say nothing until you can prove me wrong or right

Same can be said with you. Find a video saying that higher octane gas on a Yaris will increase its performance.

[battleversiontc]

explain your definition on performance to me its what ever makes it run better and not considering hp factors and i will continue to spend money on premium cause money aint a issue

[codymclelland]

Here you go: http://www.youtube.com/watch?v=dDHwCWdrtdg&feature=related

Very good experiment comparing different octanes, and proof that premium gas will not gain you anything in terms of performance.

So is this simply because the Yaris is an economy car? Does the ECU simply not recognize the higher octane fuel?

[Kaotic Lazagna]

explain your definition on performance to me its what ever makes it run better and not considering hp factors and i will continue to spend money on premium cause money aint a issue

When I say performance, I mean hp and torque, which may be different from your definition (assuming yours is running smoothly, etc). It's all good, I still get premium from Chevron despite what some people told me (more dealing with Chevron and not octane) from time to time.

[Kaotic Lazagna]

So is this simply because the Yaris is an economy car? Does the ECU simply not recognize the higher octane fuel?

I really cannot answer this knowledgeably, but perhaps.

[jouna]

what if we did 1/4 mile pases with both premium and regular or in my case i use premium with octane aditive and belive me it runs faster in the strip it sounds like it's on steroids

[Reeves360]

I just went over this with some friends.

92+ Octane makes the mix burn at a lower temp. You wont benefit from this unless you have a turbo. If you don't have a turbo you actually have more potential for carbon build up.

An easy way to look at it is if you burn a fire in your fire place the hotter it is the less smoke there will be and fewer residue left in your chimney. Burn that same fire but not as hot your going to have less heat and more smoke.

Don't put higher octane into your engine unless you have a turbo or the engine calls for it.

:drinking:

[kargoboy]

Good god not another thread about this...just use 87, nothing higher is gonna help your performance on a stock Yaris engine.

And battleversiontc, if money isn't an object, maybe you could spend a few $$ on some punctuation.

[haku]

Good god not another thread about this...just use 87, nothing higher is gonna help your performance on a stock Yaris engine.

And battleversiontc, if money isn't an object, maybe you could spend a few $$ on some punctuation.

hahahahaha. +1!

[battleversiontc]

why dont you spend some $$ and move outta monroeville and move to a nicer location then the ghettos maybe try like south hills area perhaps or bethel park or upper st clair thats right no more $$ to spend thats why makes sense you afford what you drive
Good god not another thread about this...just use 87, nothing higher is gonna help your performance on a stock Yaris engine.

And battleversiontc, if money isn't an object, maybe you could spend a few $$ on some punctuation.

[Creeper]

i thought yarisworld was above personal bashing. we are all driving econo boxes money is not an issue on this board except in the sales threads so please dont bring up your salery comparing it to others like a little civic kid with his daddys money at the strip mall on the weekend with no girl in his passanger seat. point is. i know alot of people enjoying life and happy as then i know people with alot of money in the same boat ( not saying you are) but please lets leave the personal attacks in the highschool section of the civic fourms

[vten]

from my understanding, higher octane burn more carbon , mean less deposit .

that's the way I see it.... I maybe wrong but I've been using 92+ octane even on my old mazda 626 4cyl 2.0L and 150000 miles later the car is still running strong with no leak or other major damage on the engine .

no need to argue about this ...if you have the extra money , you can spend to what you like ...it's your money , and enjoy it.

I don't look at yaris as an econobox, but rather a good car for a daily commuting. I like the way it look and I actually find it rather funny that I like to drive my yaris more and do some mods plan rather than my other 500+ hp toys in the garage.

[battleversiontc]

sorry unfortunetly its my girls money not daddy's but i wasnt tryin to be an a$$ or anything but when people say sh!t when im just trying to input my opinion like everyone else in here so not my fault is wise a$$es in here that gotta get smart with peepo

[Creeper]

its understandable, internet is very hard to read sarcasm and the likes in text. just please (not directed at anyone in specific.) lets try and bring some of the hate in these fourms down it seems like its gotten out of hand. Myself included due to recent annoyances with a certain purchass. something we are all gonna have to work on. sorry for thread jack. as for higher grade fuel i think its a personal opinion just like sham wow. works great for some people works like crap for others. could just be very minor differences in the same engine, not much made by machines is 100% accurate and perfect everytime.

[taKuto]

well assuming the ECU does do something, what would it change? does it allow more timing advance? That could be seen with an obd2 computer reader, and we could get some palpable evidence that it does something?

[kargoboy]

no need to argue about this ...if you have the extra money , you can spend to what you like ...it's your money , and enjoy it.


I don't have a problem with your comment above.

What we should have a problem with are false claims made with absolutely
no proof to back it up. This topic comes up on every forum I've ever been a member of. And usually the person making the claim gets belligerent
when they are called out on it.

Honestly, if there was some performance benefit of using higher octane
don't you think every car manufacturer would put that in the owner's
manual?

[Klink10]

^^^^ Well said.

[jouna]

vten sounds like a vtec ohh shit we have a honda impostor trying to get a yaris cuz his ass got owned by one lol

[vten]

Lol. How do you know its vtec not V10 ? Whatever float your boat, buddy.

[llimonce]

here in venezuela we have 91 and 95 octane only .. the yaris runs with any of these without problems

[N3misiS]

Ive done the same tests here in SA, now I do not know if the settings for the ECU are diffrent here than they are there but I have Ran 93, 95, and 98 fuel...

I travled 400Km with each for a work trip wich they pay for fuel, He he...
and 93 fuel burnt so much faster and after I had to clen out my motor, 95 gave me better response and aceleration, much better, also my range inproved form 524Km's to around 680Km, then 98, it did not make a diffrance at all, on these conditions I ran Shell
and nothing else, we pay around 25C a litre more for 95 but those are our Octain levels we use...

It was a 1Kr-Fe, so I dont know what other people have felt but this was my test...

[Kaotic Lazagna]

Also keep in mind that driving conditions will never be the same (i.e. tailwind, headwind, crosswinds), so you can travel the same route each day and have varying results, even with the same grade fuel.

[N3misiS]

True, but these conditions where the same more or less... it was in a day, 12 Hours driving that is....

Even in normall driving the presence of change is there...

[LittleRed]

I have experimented with 93, 91, 89 and 87 octane..without a doubt 91 is the magic number...my yaris flies with 91 octane...i also put in an aftermarket intake AEM..witch..makes a little noise...but i did notice a big difference in horsepower and torque ..especially in the top end ..it no longer drags with the A/C on...and now when i mash the throttle..it goes faster...and doesnt bog down.. now little red..is a little red rocket......putting fuel system cleaners in it really helps too... mine will vibrate at idle when it needs to be cleaned out... carbon is a by-product of combustion and it must be cleaned as well as injectors do...cleaning the carbon out keeps it running like new , which mine does at 90K .. and im still getting 40+mpg...now to tighten the suspension

[Reeves360]

Also another thing to keep in mind is that the higher your elevation the higher the octane level will be on the different grades of gas. I live at sea level regular grade gas has an octane level of 87.

If you have less oxygen in the air that your engine is mixing with gas then you will need a higher octane to produce the same sized explosion.

Hope this helps out.

:burnrubber:

[Morgan]

I feel dumber reading this thread... :rolleyes:

[06silveryaris]

i run the regulr at texaco but sometimes i even get the no name cheap stuff but once i put in 93 and my car ran as fast as a honda hahaha:burnrubber:

[LittleRed]

My yaris runs much better on 91 0ctane gas...any higher octane and it gets slower again....it must retard the timing on higher octane...my car feels like im dragging an anchor behind me on 87 gas... putting in fuel system cleaners really helps too... carbon is a by-product of combustion and must be cleaned as well as injectors do...mine will vibrate at idle when it needs to be cleaned.... it smooths back out when i put a cleaner through it ... mine runs like new at 90K... Cleaning out the carbon is the key to having an efficient engine..

[mazilla]

http://www.worldaffairsboard.com/attachments/warfare-modern-age/17236d1258614780-why-arent-crossbows-more-popular-military-assassin-sniper-weapon-wab-20necro.jpg

[Bluevitz-rs]

^ I clicked don't run but nothing happened :bellyroll:

[str8Yaris]

Run on 89 octane.... it feels good I get better acceleration from it than 87. I also ran 101... LOL but just a couple of gallons for when I race..... feels like I have a rocket under my ass.... lmao.... I'm up grading to 91 when I'm supercharged ..:headbang:

[why?]

http://www.worldaffairsboard.com/attachments/warfare-modern-age/17236d1258614780-why-arent-crossbows-more-popular-military-assassin-sniper-weapon-wab-20necro.jpg

that is total win.

[Youngbleeze]

try and fill up at least 3-4times in a row with premium and you will notice better response... i ONLY put premium in my car.

[kargoboy]

I feel dumber reading this thread... :rolleyes:

And I just remembered why I don't get over here very often any more...