hey what type of gas do you pump into ur car.
because today i was pumping gas, and the gas door says premium gas.
so i had to put 91 octane, but would it be cool if i put 87 octane??
well i have a celica GT-S....and that what the gas door says ...it has a sticker saying premium only
so i cant put regular gas in my car, like the unleaded or the plus??
cuz the premium is really expensive here in the OC.
if i would to put the regular gas, would that mess up my engine??
Last edited by guslucateo; 04-04-2010 at 10:49 AM.
As stated, it depends on the compression of the engine.
Only the Alltrac and the 7th Gen GT-S require premium. USDM trim of course. JDM engines are different as they use a different fuel rating system.
ALL other stock Celicas can use regular gas with no ill effects.
The 3SGTE being turbo runs better and won't detonate (knock) with premium, which means it won't pull timing. The 2ZZGE runs at a higher compression ratio. If you use the regular, it will detonate as well.
Detonation is not good. That means that the fuel isn't combustion 'cleanly.' Instead of one explosion, it is going in two or three, sometimes early, sometimes late. In a higher compression or turbo engine (turbo engines actually run a lower compression than even economy engines) the cylinder can heat up faster, causing premature combustion, meaning the chamber will explode before 'timed'. Your timing is normally ~10* before top dead center. This allows the complete explosion to occur by the time the piston reaches the top of the cylinder, then forcing the piston back down. If the cylinder ignites before it is supposed to, it puts too much pressure on the piston, rod and head. This could be a simple 'ping' or it could result in catastrophic failure. Cheap end? It blows your spark plug out of the head. Expensive end? It snaps a rod.
So the choice is yours, if you want to save $.50 a gallon, go ahead, but when you have to replace your engine, that savings seems kinda pointless doesn't it?
As for running the higher octane fuel in a car that doesn't require it, well that is your money too. If you car only requires 87 octane and you want to feed it 91, go ahead, but you aren't gaining anything from it. Not power, not a cleaner engine, just an empty wallet.
I have had 3SFE, 5SFE and 4AFE, not a one of them ran any different on higher octane fuel.
The rule I have always heard and lived by, is you run the cheapest gas your don't ping on.
The rule I have always heard and lived by, is you run the cheapest gas your don't ping on.
Very well put, especially summing it up.
Quote:
Originally Posted by guslucateo
well i have a celica GT-S....and that what the gas door says ...it has a sticker saying premium only
so i cant put regular gas in my car, like the unleaded or the plus??
cuz the premium is really expensive here in the OC.
if i would to put the regular gas, would that mess up my engine??
pretty good rule, when the vehicle has something with a sticker to remind the user its a pretty good idea to follow that, as its usually rather important. Octane, oil weights, coolant type, how to tow etc as major damage can happen if not followed.
by the way, all the gas will be unleaded, but anyway to properly run you need the higher octane. how expensive /gal are we talking here?
That isn't that bad. My Buick gets ~15 MPG (I am sure it would get better if I tried) and premium was running nearly $4.50 a gallon here last summer. My Buick requires premium.
yeah $3.30 isn't awful. At least it isn't my friend running cam2 in his chevy... now that will put a hole in your pocket.
ya it isnt that bad...but still it does hurt my wallet jus a bit...
but your input on everything has helped drastically, im kinda a noob on toyota
i always had a honda and acura....but now im seeing that toyota is just as good
I use premium fuel as per owner's manual instructions for my Solara. I have used regular in situations where premium is not available with no noticable effects. But I refill with premium as soon as possible. I believe the compression ratio of the engine determines which fuel is necessary.
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