What type of octane I should use??? - Page 2 - Toyota Yaris Forums

why? · 02-25-2006, 07:20 PM

Detonation is also reffered to as knock, pinging, etc.

What it means is the fuel is igniting before the engine is ready for it to explode. If it happens in a big enough quantity it can cause the pistons to be pushed clear out the other side of the engine.

This is why modern cars are created to adjust for a bad tank of fuel.

The reason to use the octane the manufacturer recommends is because the engine is designed to run on that octane with no detonation. Switching to a lower detonation could cause detonation. Switching to a higher octane should not effect detonation, as there should be none on a stock car using the manufacturers recomended octane fuel.

However on modified cars, especially forced induction vehicles, they use the highest octane they can get their hands on because it helps to prevent detonation, not to mention it means they do not have to tune the vehicle quite as much.

The biggest reason for modified vehicles having detonation is laziness of the tuners.

yariman · 02-25-2006, 10:19 PM

Hey ToTo, Simply, todays engines are designed within certain parameters to run best on a certain fuel for best performance and low emissions. The engines computor receives signals from various sensors such as how much air is being drawn in and at what temperature. timing, crankshaft position, engine speed sensors, vehicle speed sensor, EGR sensor, air-conditioning sensor, knock sensor which senses if the engine is knocking so the computor can retard timing. Oxygen sensor and on and on. The computor takes all the inputs from these sensors and adjusts whatever is needed to run at "stoichiometric" air-fuel ratio which is the air-fuel ratio which produces the most complete combustion with the fewest harmful byproducts. This gives the best compromise of power, economy and emission control. Now once again if you want to get better performance , you have to change those computor parameters. However, low emission output will be lost.

AutoTech1 · 02-26-2006, 04:57 PM

Quote:

Originally Posted by ToTo

I was just curious cause many people have this issue, whether the car runs better or not, or is it better at all for the engine and such?

The car has no performance gains and it doesn't do anything more than what your recommended octane does.

Octane is choosen to resist detonation. Here is a link that explains more of what I was trying get at as well as why?: http://www.geocities.com/runyardj/OctaneExplanation.htm

AutoTech1 · 02-26-2006, 05:11 PM

Quote:

Originally Posted by why?

Detonation is also reffered to as knock, pinging, etc.

What it means is the fuel is igniting before the engine is ready for it to explode. If it happens in a big enough quantity it can cause the pistons to be pushed clear out the other side of the engine.

This is why modern cars are created to adjust for a bad tank of fuel.

The reason to use the octane the manufacturer recommends is because the engine is designed to run on that octane with no detonation. Switching to a lower detonation could cause detonation. Switching to a higher octane should not effect detonation, as there should be none on a stock car using the manufacturers recomended octane fuel.

However on modified cars, especially forced induction vehicles, they use the highest octane they can get their hands on because it helps to prevent detonation, not to mention it means they do not have to tune the vehicle quite as much.

The biggest reason for modified vehicles having detonation is laziness of the tuners.

That's also a great point... Most people think that adding a turbo is easy. You just go to a shop and they install it for you... That's it right? WRONG... You have to think about many things... For example: If I do this modification, how will it affect my car overall? What are the risks? What is necessary and what is optional? This goes back to modified vehicles having detonation because of lazy tuners like why? was getting at... Every step in modifying a car usually leads to another step... It's not as easy as shown in the movies, but when it's done right (And through the pain of working long hours and getting little sleep; unless you are born rich) it can sure be rewarding.

why? · 02-28-2006, 09:58 AM

Quote:

Originally Posted by AutoTech1

The car has no performance gains and it doesn't do anything more than what your recommended octane does.

Octane is choosen to resist detonation. Here is a link that explains more of what I was trying get at as well as why?: http://www.geocities.com/runyardj/OctaneExplanation.htm

I disagree with that statement. I believe using a higher octane might get better gas mileage and a little better performance.

I believe this because all manufacturers use 93 octane in the USA for all the testing.

why? · 03-01-2006, 07:14 PM

Acetone used in very small amounts adds gas mileage. Acetone used in too big amounts destroys hoses and anything else in an engine that is not metal.

Note that is around .78 cc per liter or one ounce per 10 gallons. Not more than three oz. per 10 gallons.

http://pesn.com/2005/03/17/6900069_Acetone/
"Incidentally, in almost all cases, the lowest octane is best for mileage. Most modern vehicles do not have high enough compression to justify using high octane fuels. The testing indicates best mileage is usually obtained with 85 or 87 octane gasoline. Too much octane causes a loss of power and economy. BUT too little octane causes the same things plus knocking. Listen carefully to your engine for tell-tale knocks or clicks when you start out from a light. The best mileage points to the correct octane when the engine is properly tuned. See your owners manual."

swng · 03-01-2006, 08:02 PM

I would check it out with the dealership first to see if adding this kind of additive to the gas will void the warranty

.

yariman · 03-02-2006, 01:06 AM

You would be wise to stay away from acetone. C'mon gang we are not mixing fuels for funny cars, stick in what ever octane makes you feel better. If saving some money feels good then pour in 87 octane, it's all you need in Uncle Yaris.

why? · 03-02-2006, 09:47 AM

If it works to increase gas mileage then why not use it?

yariman · 03-02-2006, 11:21 AM

Once again it is controversial whether it even helps get better milage, but it is known to destroy certain rubbers. So with the already decent mileage that the Yaris gets, why look for trouble?

why? · 03-02-2006, 12:30 PM

This dude supposedly doubled his gas mileage in his neon. 40 mpg is good, but if you could get 60, or even 80, wouldn't it be worth a try?

Plus, at the tiny levels used to get the suppsed outcomes, acetone will do nothing to any engine internals.

Add to that that acetone costs very little, and I think it is at least worth a try.

jcove · 03-02-2006, 07:21 PM

Quote:

Originally Posted by why?

This dude supposedly doubled his gas mileage in his neon. 40 mpg is good, but if you could get 60, or even 80, wouldn't it be worth a try?

Plus, at the tiny levels used to get the suppsed outcomes, acetone will do nothing to any engine internals.

Add to that that acetone costs very little, and I think it is at least worth a try.

http://www.pureenergysystems.com/new...00069_Acetone/
Here's another link....
Sounds like it would be worth a try.

swng · 03-02-2006, 11:48 PM

If any members have tried acetone, please post the results. By making this request, I am not recommending or encouraging anyone to go ahead with trying. I just want to know if anyone has tried it and what's the result. I personally would wait until some gasoline additives manufacturers market products that contain acetone so that if anything goes wrong after I have used their products, I can hold them responsible.

yariman · 03-03-2006, 12:52 AM

A while ago during a deisel electronics course we got into fuels and additives etc. That's were I heard that some people thought there were milage gains and some not. Acetone does destroy some plastics and rubbers. Possibly this could take some time being so diluted in gas, if it even ends up happening at all. Be very careful of a warranty issue. If you have an engine warranty issue what do you think the dealers going to say if they happen to find acetone in your fuel? Yes you would challenge them about the fact that the acetone actually caused your problem but what a pain in the ass. Another fact mentioned in my class was that if acetone really improved milage so much how come one of the gas companies isn't adding some to their fuel and stating that their fuel actaully increases milage and cornering all gas sales? Just my opinion from what I have heard.

why? · 03-03-2006, 10:31 AM

Definately a good point.

AutoTech1 · 03-03-2006, 11:57 AM

Quote:

Originally Posted by why?

I disagree with that statement. I believe using a higher octane might get better gas mileage and a little better performance.

I believe this because all manufacturers use 93 octane in the USA for all the testing.

If you believe that why don't you just jump into a pile of BS???

AutoTech1 · 03-03-2006, 11:59 AM

Quote:

Originally Posted by why?

If it works to increase gas mileage then why not use it?

Because it doesn't. It's one of those circulated myths... It does nothing for you, except waste your money, because your car doesn't need it. It's not a Supra or a Lexus or a Beemer or a Porsche. Just get over it.

AutoTech1 · 03-03-2006, 12:05 PM

Quote:

Originally Posted by swng

I would check it out with the dealership first to see if adding this kind of additive to the gas will void the warranty

.

It won't void the warranty. Sure, you can use a higher octane, but you'll void common sense, if you void anything...

02-25-2006, 10:19 PM	#20
yariman Speed Wrenchin' Drives: 2006 Yaris 3 door, Bayou Blue Join Date: Jan 2006 Location: Delta,B.C. Canada Posts: 96	Hey ToTo, Simply, todays engines are designed within certain parameters to run best on a certain fuel for best performance and low emissions. The engines computor receives signals from various sensors such as how much air is being drawn in and at what temperature. timing, crankshaft position, engine speed sensors, vehicle speed sensor, EGR sensor, air-conditioning sensor, knock sensor which senses if the engine is knocking so the computor can retard timing. Oxygen sensor and on and on. The computor takes all the inputs from these sensors and adjusts whatever is needed to run at "stoichiometric" air-fuel ratio which is the air-fuel ratio which produces the most complete combustion with the fewest harmful byproducts. This gives the best compromise of power, economy and emission control. Now once again if you want to get better performance , you have to change those computor parameters. However, low emission output will be lost. __________________ Quench my thirst with gasoline

03-02-2006, 01:06 AM	#26
yariman Speed Wrenchin' Drives: 2006 Yaris 3 door, Bayou Blue Join Date: Jan 2006 Location: Delta,B.C. Canada Posts: 96	You would be wise to stay away from acetone. C'mon gang we are not mixing fuels for funny cars, stick in what ever octane makes you feel better. If saving some money feels good then pour in 87 octane, it's all you need in Uncle Yaris. __________________ Quench my thirst with gasoline

03-02-2006, 11:21 AM	#28
yariman Speed Wrenchin' Drives: 2006 Yaris 3 door, Bayou Blue Join Date: Jan 2006 Location: Delta,B.C. Canada Posts: 96	Once again it is controversial whether it even helps get better milage, but it is known to destroy certain rubbers. So with the already decent mileage that the Yaris gets, why look for trouble? __________________ Quench my thirst with gasoline

03-03-2006, 12:52 AM	#32
yariman Speed Wrenchin' Drives: 2006 Yaris 3 door, Bayou Blue Join Date: Jan 2006 Location: Delta,B.C. Canada Posts: 96	A while ago during a deisel electronics course we got into fuels and additives etc. That's were I heard that some people thought there were milage gains and some not. Acetone does destroy some plastics and rubbers. Possibly this could take some time being so diluted in gas, if it even ends up happening at all. Be very careful of a warranty issue. If you have an engine warranty issue what do you think the dealers going to say if they happen to find acetone in your fuel? Yes you would challenge them about the fact that the acetone actually caused your problem but what a pain in the ass. Another fact mentioned in my class was that if acetone really improved milage so much how come one of the gas companies isn't adding some to their fuel and stating that their fuel actaully increases milage and cornering all gas sales? Just my opinion from what I have heard. __________________ Quench my thirst with gasoline

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02-25-2006, 07:20 PM	#19
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	Detonation is also reffered to as knock, pinging, etc. What it means is the fuel is igniting before the engine is ready for it to explode. If it happens in a big enough quantity it can cause the pistons to be pushed clear out the other side of the engine. This is why modern cars are created to adjust for a bad tank of fuel. The reason to use the octane the manufacturer recommends is because the engine is designed to run on that octane with no detonation. Switching to a lower detonation could cause detonation. Switching to a higher octane should not effect detonation, as there should be none on a stock car using the manufacturers recomended octane fuel. However on modified cars, especially forced induction vehicles, they use the highest octane they can get their hands on because it helps to prevent detonation, not to mention it means they do not have to tune the vehicle quite as much. The biggest reason for modified vehicles having detonation is laziness of the tuners.

03-01-2006, 07:14 PM	#24
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	Acetone used in very small amounts adds gas mileage. Acetone used in too big amounts destroys hoses and anything else in an engine that is not metal. Note that is around .78 cc per liter or one ounce per 10 gallons. Not more than three oz. per 10 gallons. http://pesn.com/2005/03/17/6900069_Acetone/ "Incidentally, in almost all cases, the lowest octane is best for mileage. Most modern vehicles do not have high enough compression to justify using high octane fuels. The testing indicates best mileage is usually obtained with 85 or 87 octane gasoline. Too much octane causes a loss of power and economy. BUT too little octane causes the same things plus knocking. Listen carefully to your engine for tell-tale knocks or clicks when you start out from a light. The best mileage points to the correct octane when the engine is properly tuned. See your owners manual."

03-01-2006, 08:02 PM	#25
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	I would check it out with the dealership first to see if adding this kind of additive to the gas will void the warranty .

03-02-2006, 09:47 AM	#27
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	If it works to increase gas mileage then why not use it?

03-02-2006, 12:30 PM	#29
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	This dude supposedly doubled his gas mileage in his neon. 40 mpg is good, but if you could get 60, or even 80, wouldn't it be worth a try? Plus, at the tiny levels used to get the suppsed outcomes, acetone will do nothing to any engine internals. Add to that that acetone costs very little, and I think it is at least worth a try.

03-02-2006, 11:48 PM	#31
swng Drives: 06 3-dr auto RS Join Date: Jan 2006 Location: BC Posts: 1,051	If any members have tried acetone, please post the results. By making this request, I am not recommending or encouraging anyone to go ahead with trying. I just want to know if anyone has tried it and what's the result. I personally would wait until some gasoline additives manufacturers market products that contain acetone so that if anything goes wrong after I have used their products, I can hold them responsible.

03-03-2006, 10:31 AM	#33
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	Definately a good point.