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Old 02-14-2006, 10:18 AM   #1
krakkhenz
 
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What type of octane I should use???

Im a little confused about this, my car seller told me that I should use 95 octane gas, but the manual says I should use 91

What are the difference between 91 and 95???

My yaris got a 1.3 engine.
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Old 02-14-2006, 11:22 AM   #2
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I'd go with what the manual says.

The difference between octanes is how much pressure is required to ignite the fuel. The higher the rating the harder it is to ignite the fuel.
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Old 02-15-2006, 09:11 AM   #3
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I thought the car (Yaris) can run on 87?
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Old 02-15-2006, 10:34 AM   #4
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Quote:
Originally Posted by GabL
I thought the car (Yaris) can run on 87?
The rest of the world measures octane differently then we do in North America.
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Old 02-15-2006, 04:55 PM   #5
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oh, didn't saw the OP was from Panama...
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Old 02-15-2006, 08:15 PM   #6
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the yaris is rated to run at 91 but can also accept higher octane. most people would claim a performance boost when using higher octane. while some would even claim better fuel efficiency with higher octane.

we use 91, as it is cheaper than 95, 98 or 100 octane. :)
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Old 02-15-2006, 09:52 PM   #7
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Quote:
Originally Posted by as400g33k
the yaris is rated to run at 91 but can also accept higher octane. most people would claim a performance boost when using higher octane. while some would even claim better fuel efficiency with higher octane.

we use 91, as it is cheaper than 95, 98 or 100 octane. :)
100 octane!! It's gonna burn like
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Old 02-15-2006, 11:09 PM   #8
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Don't worry friend, the higher is the octane no., the harder it is for the fuel to burn.
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Old 02-16-2006, 07:31 AM   #9
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Hi guys! So the harder for the fuel to burn is not good in the long run? I have a TS model, I currently use 95 octane... What if I were to use 98 or 100 octane fuel, what would change? Would the car run better or would I feel a bit more power or torque, or is all this just BS?
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Old 02-16-2006, 08:19 AM   #10
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Use what is recommanded in your user manual...

http://autorepair.about.com/od/engin...hoctanegas.htm
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Old 02-16-2006, 10:18 AM   #11
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Quote:
Originally Posted by ToTo
Hi guys! So the harder for the fuel to burn is not good in the long run? I have a TS model, I currently use 95 octane... What if I were to use 98 or 100 octane fuel, what would change? Would the car run better or would I feel a bit more power or torque, or is all this just BS?
Unless you are experiencing rough running or misfires, then odds are the car would not run smoother.

However there prolly would be a slight increase in tourque and fuel mileage with higher octane fuel.

With fuel that is harder to burn, the spark timing can be set better, and the detonation can be more exact. This also means that the computer can use a more exact air/fuel ratio.

The thing is if your vehicle is stock, it might not make a difference that you could actually feel in everyday driving. The only way you could tell is by using a dyno, and that gets really expensive.
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Old 02-16-2006, 11:27 AM   #12
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ummm... thanx for your replies, im using 95 octanes since the first day, but im gonna try with 91 and set the trip B for the next refuel.
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Old 02-16-2006, 08:19 PM   #13
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Quote:
Originally Posted by GabL
Use what is recommanded in your user manual...

http://autorepair.about.com/od/engin...hoctanegas.htm
Actually, you and why? know a lot!
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Old 02-17-2006, 04:07 AM   #14
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Thanks guys! I have no problems at all with the car, it runs great! I just didn't know the low down on the higher octane stuff... I guess I'll just stick with Shell 95 octane fuel. Oh yeah, Shell has a V-POWER 95 octane fuel as well besides the V-POWER RACING 100 octane fuel, do any of you have opinions or experiences on the V-POWER 95 octane fuel? Supposedly it contains some additives or something extra that the regular 95 doesn't...
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Old 02-17-2006, 08:40 AM   #15
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No experience with it, I don't remember seeing anything like that marketed over here.

But additives usually do something interesting, so you could give it a try and see what it does, but since it is the same octane, it prolly will only do things like clean the engine, I don't think it would make a difference in the power output of the vehicle.
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Old 02-17-2006, 03:34 PM   #16
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Quote:
Originally Posted by why?
No experience with it, I don't remember seeing anything like that marketed over here.

But additives usually do something interesting, so you could give it a try and see what it does, but since it is the same octane, it prolly will only do things like clean the engine, I don't think it would make a difference in the power output of the vehicle.
Yeah, this is also what I heard, that additives really do something to the engine which is not really harmful, but rather good for the engine since it cleans it somehow! I might give it a try though...
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Old 02-18-2006, 06:13 PM   #17
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Additives help clean the fuel system etc. but you are only wasting money using higher octane thinking that the Yaris will benefit from it. As I mentioned in another post, unless you change your prom fuel/timing maps you can't advance your timing or add more fuel to even get detonation.
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Old 02-19-2006, 03:34 AM   #18
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Quote:
Originally Posted by yariman
Additives help clean the fuel system etc. but you are only wasting money using higher octane thinking that the Yaris will benefit from it. As I mentioned in another post, unless you change your prom fuel/timing maps you can't advance your timing or add more fuel to even get detonation.

I got ya Yariman, thanks for the input!
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