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AznKhaos
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AznKhaos Nov 16, 5:28am - #327415 
2003 Spectra Mica Blue Toyota Celica GT
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Central California
octane/gas question

does it matter wat kinda octane i put in my car? does it really perform better on higher octane? wats the best to use for my GT?

it doesnt matter wat u drive or who u driving against its all about how you drive
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Saikou_Serika
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Saikou_Serika Nov 16, 8:38am - #327416 
2003 Black Toyota Celica
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whats best is what the book tells you, if it dont need premium dont put premium. a lot of ppl think that higher octane always means better performance but thats wrong, putting high octane gas in engines that are designed for lower octane will screw up your engine!

"They say that one can tell how a man treats himself by the way that he treats his car" -> french guy from "transporter"
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unsceenTRD
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unsceenTRD Nov 16, 8:54am - #327417 
2002 Carbon Blue Toyota Celica
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^^^^ thumbsup
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SleeprGT
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SleeprGT Nov 16, 12:59pm - #327418 
2002 Silver Toyota Celica GT
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it will not hurt your engine to put a higher octane in it. and i feel that my car accellerates best with 92 octane. i used 89 but it didn't feel as good.
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simonw
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simonw Nov 16, 2:31pm - #327419 
2001 White Toyota Celica ZR
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I put 98 octane for my GTS seems fine though
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ragingpaseo
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ragingpaseo Nov 16, 5:02pm - #327420 
2003 blue Toyota Celica
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towson, md
^you're suppose to use at least 91 for GTS. as for a GT, 89 would be more than enough...
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skym
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skym Nov 16, 5:19pm - #327421 
2001 Silver Toyota Celica GT
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Originally Posted by ragingpaseo
^you're suppose to use at least 91 for GTS. as for a GT, 89 would be more than enough...


The celica manual says 91 for gt...
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ragingpaseo
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ragingpaseo Nov 16, 5:21pm - #327422 
2003 blue Toyota Celica
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don't own a GT, scan it for me...
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skym
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skym Nov 16, 5:22pm - #327423 
2001 Silver Toyota Celica GT
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Hold on

Quote:
Originally posted by tido:
i beat a dude on a bike going to work today...i revved on him and we lined up at the light and it was on....i hit lift once...thats how hardcore it was....
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skym
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skym Nov 16, 5:26pm - #327424 
2001 Silver Toyota Celica GT
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Hm... guess you were right.

1ZZ-FE engine
Unleaded gasoline, Octane Rating 87 (Research Octane Number 91)

2ZZ-GE engine
Select premium unleaded gasoline with an Octane Rating of 91 (Research Octane Number 96) or higher for optimum engine performance.

GT's 1ZZ-FE right?
anyways what the hell is research octane number?

Quote:
Originally posted by tido:
i beat a dude on a bike going to work today...i revved on him and we lined up at the light and it was on....i hit lift once...thats how hardcore it was....
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ragingpaseo
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ragingpaseo Nov 16, 5:27pm - #327425 
2003 blue Toyota Celica
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towson, md
GT is 1zz-fe...
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ACE_GTS
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ACE_GTS Nov 16, 5:46pm - #327426 

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I think higher octane should make your car perform better. That why their is racing fuel such as CAM2 that high on octane.
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skym
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skym Nov 16, 5:49pm - #327427 
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so it says 87 for GT. so does that mean anything higher woundn't help? or are they saying that it's ok...

It doesn't say like the GTS like 91 or higher

Quote:
Originally posted by tido:
i beat a dude on a bike going to work today...i revved on him and we lined up at the light and it was on....i hit lift once...thats how hardcore it was....
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Sancho
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Sancho Nov 16, 5:51pm - #327428 

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Columbia Encyclopedia definition of octane number:

figure of merit representing the resistance of gasoline to premature detonation when exposed to heat and pressure in the combustion chamber of an internal-combustion engine. Such detonation is wasteful of the energy in the fuel and potentially damaging to the engine; premature detonation is indicated by knocking or pinging noises that occur as the engine operates. If an engine running on a particular gasoline makes such noises, they can be lessened or eliminated by using a gasoline with a higher octane number. The octane number of a sample of fuel is determined by burning the gasoline in an engine under controlled conditions, e.g., of spark timing, compression, engine speed, and load, until a standard level of knock occurs. The engine is next operated on a fuel blended from a form of isooctane that is very resistant to knocking and a form of heptane that knocks very easily. When a blend is found that duplicates the knocking intensity of the sample under test, the percentage of isooctane by volume in the blended sample is taken as the octane number of the fuel. Octane numbers higher than 100 are found by measuring the amount of tetraethyl lead that must be added to pure isooctane to duplicate the knocking of a sample fuel. At present three systems of octane rating are used in the United States. Two of these, the research octane and motor octane numbers, are determined by burning the gasoline in an engine under different, but specified, conditions. Usually the motor octane number is lower than the research octane. The third octane rating, which federal regulations require on commercial gasoline pumps, is an average of research octane and motor octane. Under this system a regular grade gasoline has an octane number of about 87 and a premium grade of about 93. Most American-made cars that were built in the 1971 model year or later can use regular gasoline. To prevent knocking, premium grade gasoline must be used in many cars built before 1971 and in some new cars that have high-performance engines.

There you have it wave

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skym
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skym Nov 16, 5:56pm - #327429 
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Nice~ thanks for the info
so the pumps in the us are average of those two.
Still most of the pumps tell you right under the big numbers
I'll haveto look for that next time

Quote:
Originally posted by tido:
i beat a dude on a bike going to work today...i revved on him and we lined up at the light and it was on....i hit lift once...thats how hardcore it was....
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celicadragon
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celicadragon Nov 16, 6:34pm - #327430 

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the higher the better always and also better for the engine i used 91 up for my cavalier and i felt it ran better on that

respect the gt-s
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celicadragon
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celicadragon Nov 16, 6:45pm - #327431 

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i have to use 91 up the gts i would anyway even if i had a gt

respect the gt-s
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Doppelganger
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Doppelganger Nov 16, 8:19pm - #327432 

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http://www.handymanusa.com/articles/octane.html

This and every other article I've read indicate that there is no benefit to using higher octane than what the engine is designed for. The reason suped-up sports cars use higher octane gasoline is because they have higher compression ratios and need the higher octane to prevent premature detonation, not because the higher octane has any performance benefits itself. If you're not getting premature detonation, there is no reason to go to a higher octane.
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skym
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skym Nov 16, 9:40pm - #327433 
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really...
That'll actually help my wallet and save more for other parts.
Thanks

Quote:
Originally posted by tido:
i beat a dude on a bike going to work today...i revved on him and we lined up at the light and it was on....i hit lift once...thats how hardcore it was....
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renfield90
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renfield90 Nov 16, 10:00pm - #327434 

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I'm aware of all the literature and the mechanics behind it, but why does every GT owner here who puts in 91 (including myself) swear that the car feels slightly better? Even veteran members on this site very knowledgable about cars put 94 in the GTS because they feel a difference too. If you put 91 in a Ford Taurus, a Honda Civic DX, or some other random, general car it won't do much but the Celica GT isn't exactly an average car. My theory is that the 1ZZ's higher-than-average compression helps take advantage of 91.

The first time I floored my Celica it gave me butterflies in my stomach (I suspect the dealer put 91 in the tank, he didn't know what he was doing) and that first tank I had a lot of fun. Every tank after for 6 weeks was 87, and it just didn't feel the same as when I first bought it. On a whim one night I filled up with 91, turned out of the gas station and floored it. Butterflies in my stomach again.

I'm currently testing out 89 on my car and so far haven't noticed a difference compared to 91, and my idling problem has gone away (probably a combination of other factors). I'll be testing this out for a few months, you can see my thread here:

https://www.celicahobby.com/ubbthreads/thread.f_1953333755_0_collapsed_5__1.html

A GT can safely take 87, the best thing you can do is to try out different grades yourself and find which one you personally think is right. There is always going to be a debate on this...

EDIT: I see a lot of noobs posting here and very few vets with real experience, maybe some of you guys could help us out. thumbsup
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Saikou_Serika
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Saikou_Serika Nov 16, 11:00pm - #327435 
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first of all, dont assume that just because it doesnt say "elite member" under our name it means we dont know anything. now whatever you ppl with gt want to do with ur car whatever, but you guys have a comp ratio of 10.00 to 1 while we gts owners have 11.50 to 1.

The octane grades are designed to accommodate engines with different compression ratios. High compression engines, found in most performance cars, require a fuel that burns efficiently at a higher temperature. Thats what premium fuel does, it burns hot under high compression. In a normal engine, premium fuel does not burn completely, resulting in excess carbon build-up and carbon fouling of the spark plugs. The end result is a less efficient engine that requires tune-ups more frequently.

hope that helps

"They say that one can tell how a man treats himself by the way that he treats his car" -> french guy from "transporter"
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Saikou_Serika
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Saikou_Serika Nov 16, 11:04pm - #327436 
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VSGTS14 Nov 16, 11:12pm - #327437 

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for a gt - use 87 or above
for a gts - use 91 or above

i use 93

SUBARU TECNICA INTERNATIONAL
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renfield90
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renfield90 Nov 16, 11:17pm - #327438 

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10:1 is still higher than average. (I doubt many people will agree that the 1ZZ is a "normal" engine.) It's low enough where it can take 87, but you still haven't explained why so many GT owners will swear that 91 is slightly better. Sure it might cause damage in a car that was designed strictly for 87 (again, cars like a Ford Taurus) but from the number of GT owners on this site using 91 I doubt it's causing damage.

I'm sorry if I implied anything about your intelligence level, but if you look through all the posts there are only a handful that have been on this site a long time. if you've read any of the other gas threads you'll see there are a lot of people on this site with lots of knowledge about this, and I was inviting them to toss their $.02 in. I know that some people join this site already with lots of knowledge and that you can't judge them on their post count.
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RevMonster
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RevMonster Nov 16, 11:17pm - #327439 

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ohboy

If you guys really think you feel a difference with premium gas in a GT I won't argue... but logically, there is just no way.

Once you are using the octane level at which the engine is no longer knocking, there is no benefit to using higher octane gasoline. If the GT requires 91 octane to avoid knocking, that would mean the GTS would require what... 93... 95? The GTS and GT certainly can't require the same type of gasoline. Since some states don't even SELL above 91 octane at the pump, I find it hard to believe Toyota designed the 2zz engine to require higher than 91... which make me greatly doubt the 1zz can require higher than 89.

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renfield90
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renfield90 Nov 16, 11:21pm - #327440 

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GT will not knock at 87
GTS will not knock at 91

I'm not talking about requirements, i'm talking about what works good. 91 is not required for a GT, but it works good.
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Rave669
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Rave669 Nov 16, 11:28pm - #327441 

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There is no difference in performance. The higher the octane rating, the more resistant it is to detonation. unless your car is tuned to run premium, stick with regular.

If you run 93 octane in a car designed for regular, not all that fuel is going to be burned in the combustion process. Yes, your car will idle a little smoother, but a lot of that fuel is just gonna burn in your cat or go out the tailpipe. not very smart, especially with gas being so expensive these days.

If the engine has high compression, or the timing is advanced, you may want to raise the octane a bit. if you reprogram your ECU, run a stand-alone or get a chip (a real chip, the kind that actually has a new program rom) then you want to run a higher octane. Otherwise, stick to regular for sure, or it's just money down the drain.

GTS owners are advised to run 91 octane or higher, Best results seem to come from 93 octane, but in the GTS, the manual suggests 91 or higher (meaning, you can go as high as 100 octane, since anything more will be leaded fuel)

Hell, I remember when people were flipping out in the 70's over the gas crisis. Fuel prices got as high as $1.65 a gallon.

These days, fuel costs are even higher, yet people don't seem to care one bit this time around. They buy SUVs and don't seem to have a care in the world...

Just wait until you start seeing gas station lines that reach around the block, and they start rationing fuel; it'll be the 70's all over again, but people are still oblivious.

Honestly, if your car can run regular, run regular in your car. Only put something higher in if they are out of regular at the station. anything more is just wasteful, and believe me, nobody misses it until it's gone.

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GT4
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GT4 Nov 16, 11:30pm - #327442 

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Butt dyno is pretty inaccurate grin

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Virgilson Nov 16, 11:37pm - #327443 

TheFilipinoCrew
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didn't i already post a thread about this. ?
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AznKhaos
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AznKhaos Nov 17, 1:06am - #327444 
2003 Spectra Mica Blue Toyota Celica GT
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Central California
^^yea you prob did..i kno i did but being who i am im lazy and i just made another topic.

but anyways thanks for the advise. i think imma just continue putting 89 in my car. it seems to wrok well and its not all the way premium. but feels better to me then 89

it doesnt matter wat u drive or who u driving against its all about how you drive
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AznKhaos
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AznKhaos Nov 17, 1:07am - #327445 
2003 Spectra Mica Blue Toyota Celica GT
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Central California
oh yea and thanks for all ur $.02 everyone. anyone else who wanna comment are welcome to ur opinions...man i love everything celica..and the ppl here

it doesnt matter wat u drive or who u driving against its all about how you drive
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skym
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skym Nov 17, 2:15am - #327446 
2001 Silver Toyota Celica GT
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Yeah I love you too man. And all yall!!! thumbsup

Quote:
Originally posted by tido:
i beat a dude on a bike going to work today...i revved on him and we lined up at the light and it was on....i hit lift once...thats how hardcore it was....
Joined: Dec 2003
Posts: 2,672
ragingpaseo
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ragingpaseo Nov 17, 5:55am - #327447 
2003 blue Toyota Celica
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towson, md
Originally Posted by Rave669
If you run 93 octane in a car designed for regular, not all that fuel is going to be burned in the combustion process. Yes, your car will idle a little smoother, but a lot of that fuel is just gonna burn in your cat or go out the tailpipe. not very smart, especially with gas being so expensive these days.

exactly...
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AzNRaCeR
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AzNRaCeR Nov 17, 5:18pm - #327448 
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but for me i have to use the premium 93 or else it will knock

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