which gaseoline do you use?

[masterpp]

I'm wondering which gasoline do you use for GT-S? regular, plus, or premium. The manual book say "Premium for GT-S". What happen if i use regular, will it affect something?

[coOOlcelica]

only premium for the gt-s and plus for the gt

[cftofu2k]

plus for the gt? i thought regular is fine

[WRENCHHEAD]

i use 87 from chevron.

[AM03GT]

87 mobil, was using 89... when i switched down to 87 it actually feels like it's running better, and gas mileage increased a bit...

[MeGaXmAn27]

premium.. gt-s needs premium.. gt's don't.. and its not really recommend to use anything higher then needed

[gdog1982]

If you use less than premium gas for the gt-s you might have knocking problems because of improper combustion. I use 93 octane for my gt-s.

[zcs626]

89 octane for my GT here.

[Black00GTS]

93 only for my GT-S.

[supermatt]

94 for my GT-S here

[oldster]

91 is all that is required for the GT-S and 87 for the GT.

[CGts00]

premium only for a gts

[dfess1]

all depnds on what you have done to your car. In my M, I have an intake and exhaust, which normally wouldn't matter, but with the chip that I have in there, it has leaned out the mixture as much as possible. If I run anything less than 93, she knocks pretty bad...

[Celica2K2]

i use 93 for my GT

[BB_GT01]

93 for a GT seems a waste. My GT runs quite well on Shell 87. If it doesn't knock, more octane is a waste of money. All octane ratings do is define the ability to avoid knock at higher compression ratios. There is no scientific evidence that it adds power.

[KylieImportGT]

I switch between regular and midgrade on my GT, depending on Price

[Griffin]

Well when I had my GTS it was always Chevron Premium. It is THE best. If I can't get that then shell or BP. If not them then Phillips 76. I avoid Citgo, Mobil and any others or generics like the plague.

Oh - Sunoco 94 is a nice fuel too, but damn hard to find most places.

GTS is 11.5:1 compression - 91or higher octane is a must. The car does not run as well on lower octane.

GT - 87-89 octane is ideal. The car is not tuned for high octane and hence will never advance timing far enough to make the premiuj worthwhile.

[trdcelicaaa]

93 on my gt

[Vroom_Vroom]

ive been using 92 on my celica gt, is it bad to switch back and fourth from fuels with different octane ratings?

[2KGTS]

The timing will automatically retard to allow for lower octane gas. However, it will only go so far. If you hear pinging on acceleration, etc. move to the next higher grade.

Even the GT will benefit some from higher octane gas.

My baby gets nothin' but 92-94 octane and has for over 100,000 miles...

[MeGaXmAn27]

wow, im suprised at how many gt's use over 90+ mark.. i read that it really doesn't make difference and it can actually be more harmful.. someone correct me if im wrong

[Vroom_Vroom]

i hope it doesnt do anything bad :(

[trdcelicaaa]

if you have a gt with i/h/e and other mods you should use a least 89, but 93 wont hurt your engine just prevent it from detination. Also i know gas cools down your engine and it might be a result of the octane level, so i would imagine that gt's with 93 will keep the engine lasting longer. Also the higher octane the cleaner the gas is. A machanic from shell told me that 93 octane will keep your engine cleaner then the other octane levels, but will not give you HORCE POWER.

[oldster]

Originally posted by trdcelicaaa
if you have a gt with i/h/e and other mods you should use a least 89, but 93 wont hurt your engine just prevent it from detination. Also i know gas cools down your engine and it might be a result of the octane level, so i would imagine that gt's with 93 will keep the engine lasting longer. Also the higher octane the cleaner the gas is. A machanic from shell told me that 93 octane will keep your engine cleaner then the other octane levels, but will not give you HORCE POWER.

6.13 Can higher octane fuels give me more power?
On modern engines with sophisticated engine management systems, the engine can operate efficiently on fuels of a wider range of octane rating, but there remains an optimum octane for the engine under specific driving conditions. Older cars without such systems are more restricted in their choice of fuel, as the engine can not automatically adjust to accommodate lower octane fuel. Because knock is so destructive, owners of older cars must use fuel that will not knock under the most demanding conditions they encounter, and must continue to use that fuel, even if they only occasionally require the octane.

If you are already using the proper octane fuel, you will not obtain more power from higher octane fuels. The engine will be already operating at optimum settings, and a higher octane should have no effect on the management system. Your driveability and fuel economy will remain the same. The higher octane fuel costs more, so you are just throwing money away. If you are already using a fuel with an octane rating slightly below the optimum, then using a higher octane fuel will cause the engine management system to move to the optimum settings, possibly resulting in both increased power and improved fuel economy. You may be able to change octanes between seasons ( reduce octane in winter ) to obtain the most cost-effective fuel without loss of driveability.

Once you have identified the fuel that keeps the engine at optimum settings, there is no advantage in moving to an even higher octane fuel. The manufacturer's recommendation is conservative, so you may be able to carefully reduce the fuel octane. The penalty for getting it badly wrong, and not realising that you have, could be expensive engine damage.

6.14 Does low octane fuel increase engine wear?
Not if you are meeting the octane requirement of the engine. If you are not meeting the octane requirement, the engine will rapidly suffer major damage due to knock. You must not use fuels that produce sustained audible knock, as engine damage will occur. If the octane is just sufficient, the engine management system will move settings to a less optimal position, and the only major penalty will be increased costs due to poor fuel economy. Whenever possible, engines should be operated at the optimum position for long-term reliability. Engine wear is mainly related to design, manufacturing, maintenance and lubrication factors. Once the octane and run-on requirements of the engine are satisfied, increased octane will have no beneficial effect on the engine. Run-on is the tendency of an engine to continue running after the ignition has been switched off, and is discussed in more detail in Section 8.2. The quality of gasoline, and the additive package used, would be more likely to affect the rate of engine wear, rather than the octane rating.

[celi4me]

it is this simple: The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.

The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance."

so in conclusion, if you are buying a gasoline with a higher octane rating then what your engine is determined to be you are wasting your money. a GT has a low compression ratio. so you only need low octane gasoline. the compression ratio in a GT is not high enough to cause the fuel to spontaneously ingnite without the spark from the spark plug. a GTS on the other hand does have a higher compression ratio. so the GTS needs a higher octane gasoline. the higer compression ratio in a GTS will cause lower octane fuel to spontaneously ingnite under compression alone, without the spark from the spark plug. the higher compression ratio is what gives the GTS its 40 extra horsepower (see second paragraph above)

"and that's all I have to say about that"

[SilverRide]

celi4me got it 100% correct.

The notion that using higher octane than nessary wiil somehow give you more power is a direct result of purposely misleading advertising copy. This sort of advertising has been banned by the FTC for some time now.

There is also the notion that higher octane gas will keep your engine cleaner due to higher detergent levels.
This might have been true years ago with some brands that only added detergent to "premium" grades (as a marketing tool) but, with the advent of fuel injection, it has become absolutely nessary to add adequate detergents in all grades of gas, not just in "premium".

There used to be a Mobil add that claimed you could "drive you engine clean with Mobil premium".
They were ordered by the FTC to pull those adds because there was/is the same levevel of detrergents in all Mobil grades.
Just one example of misleading advertising.

[CreepingJeff]

i use 85 in my GT here in nosebleed country.

[VolComgNu]

just use what the engineers at Toyota said, Premium on the GT-S and whatever the GT says to use...the celica gets such good gas mileage, who cares.

[portopotti]

have a GT, use 87 with no problems

[nyoneway]

Originally posted by CreepingJeff
i use 85 in my GT here in nosebleed country.

Wow they sell 85? That's like what, tar?

[oldster]

Originally posted by nyoneway


Wow they sell 85? That's like what, tar?

You need less octane at altitude.

[CreepingJeff]

Originally posted by nyoneway


Wow they sell 85? That's like what, tar? pretty much. :chuckles: but the celica seems to like it.

[R K e 1 C A]

Premium

[SpiderXdeviL]

premium for gt-s i ono about gt

[edgarchan]

GTS required premium. I don't know about GT. Anyways, don't you higher octane than you need. The reason why Cali get only 91 is because ppl here are too rich and they think putting premium gas in their car is better. Therefore, gasoline refinery needs to lower the octane for premium since there not enough resource to satisfy all the premium gas demand.