93 octane a waste?

[bc88]

i didn't really do much research into the mechanics behind the car before i got it. i just wanted to know if 93 octane would be a waste for my new 05 S? i know on the book it says 87 or better...but would the car use the 93 octane to its advantage?

[REN69]

Basically yeah.. only the XRS is required to run on 91 or better, the S will run on 87 with no problems... it just runs cleaner with higher octane really.

[PhantomS]

Originally Posted by bc88

i didn't really do much research into the mechanics behind the car before i got it. i just wanted to know if 93 octane would be a waste for my new 05 S? i know on the book it says 87 or better...but would the car use the 93 octane to its advantage?

If your S is not "pinging" on 87 (as it should not be) then, no, higher octane just wastes more of your $$$. The XRS requires higher octane (I belive it's 91 + ???) because of the motor....the S has a plain jane corolla motor, just like the CE and LE (not that there's anything wrong with that - we have a new S and love it - performance is adequate, it looks good, and most importantly, gas mileage is VERY good

edit : Haha...REN69 beat me to it whilst I was proofreading and re-proofreading my post...heh

[snakoil]

if you put higher octane fuel on a engine that is not meant to take it, some fuel will not burn during the compression and the fuel will stay in the conbustion chamber and fall by the side of the pistons. This will wear the rings faster and will also mix fuel into your oil system. Fuel is an abbrasive and will damage some of the plastic(caoutchouc) pipes for the oil system. And it won't help you get more power since on the other side, not all the fuel will be burned!

Don't see octane as a better fuel...octane just retards the fuel to combust.
Diesel fuel have very low octane indice this is why you don't need a spark plug because only the compression is enough to make the fuel combust.

Puting high octane on a computer that doesn't need it is like burning your money and having the chance to change some parts sonner than you would need!!!

[REN69]

Originally Posted by PhantomS

If your S is not "pinging" on 87 (as it should not be) then, no, higher octane just wastes more of your $$$. The XRS requires higher octane (I belive it's 91 + ???) because of the motor....the S has a plain jane corolla motor, just like the CE and LE (not that there's anything wrong with that - we have a new S and love it - performance is adequate, it looks good, and most importantly, gas mileage is VERY good

edit : Haha...REN69 beat me to it whilst I was proofreading and re-proofreading my post...heh

I got quick fingers... LOL!

[silver04rollas]

I started out using 91 Octane on my XRS and now been using 94 Octane for the last two months and yes it does feel stronger in lift and feels a bit smoother, but that is mostly because of the 11:5:1 compression ratio of the engine. It will not make any difference to a low compression engine.

[boosted gt]

some premium fuels have more detergents in them so it might be a little better, but for the cost i'd just stick to the 87 and save alot of $ since the car does not require high octane

[shogun6684]

Originally Posted by boosted gt

some premium fuels have more detergents in them so it might be a little better, but for the cost i'd just stick to the 87 and save alot of $ since the car does not require high octane

I've always wondered, what does the type of octane have to do with that pinging noise that you hear in the engine??

[Flashmn]

if you put higher octane fuel on a engine that is not meant to take it, some fuel will not burn during the compression and the fuel will stay in the conbustion chamber and fall by the side of the pistons. This will wear the rings faster and will also mix fuel into your oil system

Thats a big load of crap. No it wont fall from the sides of the piston
Only reason when fuel is a problem is when you're running rich, that has nothing to do with octane, it has to do with the amount of fuel vs. air. it errodes the cylinder walls, because the quality of the fuel is such that it cleans the oil film off from the cylinder walls. Some blow-by gas is always pushed into the crank case, but thats why theres the PCV system to take care of the gasses that blew past the piston rings. Gasoline as in liquid-form shouldnt, or you're running alot of other problems in your car.

What octane does is raise the knock tendency of the engine, higher compression engines generally require higher octane gas.

[Pineapple]

Also the higher grade gas usually are cleaner. I say try a tank of high octane and see if you can feel the different. I found the engine rev easier, idle smoother, better milage with higher octane.

[idk83]

With my XRS I have found it true that it idles better and has more power.
My Thunder bird liked 89% better than 87% but didn't care about the 91% or 93% they just ran the same as the 89% with out better milage

[Corolla_reps]

i would only stick to 89 octane because it maybe better than 87 octane because i heard 87 octane contains some additives that can make ur engine not last longer...otherwise my ae92 manual says that 89 octane is necessary for my engine anyway...

[Jaredjon]

You know, in Colorado Springs, 85 octane is regular unleaded. 87 octane is considered premium. 89 is super... what do you buy in this case for an LE 03?

[REN69]

premium or super I guess..