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Regular VS Premium
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27 / M / canada..........ehh
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Posted 5/1/08

pookie052606 wrote:


starmine92 wrote:

damn cars must be the worst type of investment ever, they just keep on sucking out your money. but anyways couldnt it damage your car if you use a octane level too low or something?


Using octane thats too low will induce engine knock, and engine knock will damage your engine.
Using too high of octane, will serve no purpose as far as power output, fuel economy or increased engine life.


ohh i see, so engine knock just basically damages the components of the engine?
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27 / M
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Posted 5/1/08

PhilTheAsian824 wrote:
Engine rust?

And yeah there are 100+ Octane for those crazy dragsters and other race cars again because of high compression.


You don't get engine rust by using a lower rated octane fuel. It doesn't work that way. In fact if you have rust inside of your engine, you've got some serious problems that probably have no relation to fuel. As for actual dragsters, not just street cars set up for drag, they typically run on nitromethane. It's a completely different fuel that I'm not even going to discuss, but to put it mildly is extremely volatile and has a much lower stoichiometry than gasoline.

As for octane rating they make a determination on how volatile the fuel is and how likely you are to have detonation. Now for any stock, aside from supercars, you're fine with even 87 octane. Unless you race constantly and have a highly tuned high horsepower vehicle you don't need the extra protection because you're not running up to redline every 5 seconds. If you think you honestly need to constantly put in 91/93 octane in you're car you're probably mistaken. If you have an aftermarket engine management tuned for a certain octane rating then you could actually damage your engine, but very few people do. In the end, higher octane has more potential power because you can run more boost or timing without detonation, which not only can be damaging, but reduces the power you make. If anyone has any questions about this you can message me, or you can simply look at this: http://en.wikipedia.org/wiki/Octane_rating

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22 / F / Nebraska
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Posted 5/1/08

starmine92 wrote:


pookie052606 wrote:


starmine92 wrote:

damn cars must be the worst type of investment ever, they just keep on sucking out your money. but anyways couldnt it damage your car if you use a octane level too low or something?


Using octane thats too low will induce engine knock, and engine knock will damage your engine.
Using too high of octane, will serve no purpose as far as power output, fuel economy or increased engine life.


ohh i see, so engine knock just basically damages the components of the engine?


Yep.
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74 / namimori
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Posted 5/1/08
premium
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74 / M / at yo window with...
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Posted 5/2/08

ShinigamiDGs wrote:

ok ...i'm too young to talk about this topic because i'm 13 and i don't own a car...but if i was u guys , like 20 + , i would chose a premium grade .


so the type of gas you should get depends on your age? heres some advice for when you fill up your own car.. if the car doesnt need premium gas, dont get it. youll be wasting money. and gas aint cheap.

and to answer the question. premium for my high cr car. which is pwning me now since gas is over $4/gallon
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24
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Posted 5/2/08
regular
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30 / a
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Posted 10/31/08

carl24 wrote:

SHELL V-POWER!


shell v-power is just 93 octane reading.. read your octane rating not the name or trademark of the gasoline
Posted 11/1/08
premium! only because its so dam affordable now:D
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29 / M / USA
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Posted 11/1/08
i say Premium + octane booster...better car performance overall
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24 / M / SoCal
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Posted 11/1/08
91ftl. Gas prices went down.
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32
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Posted 11/1/08
91 for the motorcycle and 89 for the car.
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25 / M / San Francisco, Ca...
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Posted 11/1/08
Octane only prevents premature detonation in the engine. When a car has a high compression ratio, the higher the octane needed for the car. Many sport cars can take higher octane cause of their high compression ratio. For example, if a car designed for better fuel economy usually has low compression ratio, high octane will not affect the power of the car. If you had a car designed for speed (not A LOT of speed) usually has high compression ratio and will be able to take higher octane fuel. A car in my area has a 13:1 compression ratio and has to take 100 octane fuel. Lower than that, it won't run. For those adding turbo and/or supercharger and adds higher octane fuel just thinking it makes the car go faster will probably destroy their engine quicker. Adding a turbo and/or supercharger without changing the piston is bad for the car. And to correct pookie052606, engine knock is a noise originating from the pistons; so if a car is given the wrong octane fuel for a long period of time, it will damage engine components (most likely piston components). My '98 Subaru Impreza 2.5rs can take 91 unleaded fuel giving it a little bit more BHP, but the engine won't last as long (note: Subaru's recommended fuel is 87 unleaded fuel.
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32
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Posted 11/1/08

taketoshibc wrote:

Octane only prevents premature detonation in the engine. When a car has a high compression ratio, the higher the octane needed for the car. Many sport cars can take higher octane cause of their high compression ratio. For example, if a car designed for better fuel economy usually has low compression ratio, high octane will not affect the power of the car. If you had a car designed for speed (not A LOT of speed) usually has high compression ratio and will be able to take higher octane fuel. A car in my area has a 13:1 compression ratio and has to take 100 octane fuel. Lower than that, it won't run. For those adding turbo and/or supercharger and adds higher octane fuel just thinking it makes the car go faster will probably destroy their engine quicker. Adding a turbo and/or supercharger without changing the piston is bad for the car. And to correct pookie052606, engine knock is a noise originating from the pistons; so if a car is given the wrong octane fuel for a long period of time, it will damage engine components (most likely piston components). My '98 Subaru Impreza 2.5rs can take 91 unleaded fuel giving it a little bit more BHP, but the engine won't last as long (note: Subaru's recommended fuel is 87 unleaded fuel.





Not really. Its usualy a poor tune that does the engine in. A stage 1 set up on a stock engine with a good tune wont cause any problems. ive seen stock engines with 150k + miles on em run just fine for years.
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26 / M / Philadelphia
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Posted 11/1/08

taketoshibc wrote:

Octane only prevents premature detonation in the engine. When a car has a high compression ratio, the higher the octane needed for the car. Many sport cars can take higher octane cause of their high compression ratio. For example, if a car designed for better fuel economy usually has low compression ratio, high octane will not affect the power of the car. If you had a car designed for speed (not A LOT of speed) usually has high compression ratio and will be able to take higher octane fuel. A car in my area has a 13:1 compression ratio and has to take 100 octane fuel. Lower than that, it won't run. For those adding turbo and/or supercharger and adds higher octane fuel just thinking it makes the car go faster will probably destroy their engine quicker. Adding a turbo and/or supercharger without changing the piston is bad for the car. And to correct pookie052606, engine knock is a noise originating from the pistons; so if a car is given the wrong octane fuel for a long period of time, it will damage engine components (most likely piston components). My '98 Subaru Impreza 2.5rs can take 91 unleaded fuel giving it a little bit more BHP, but the engine won't last as long (note: Subaru's recommended fuel is 87 unleaded fuel.


Adding a turbo or supercharger to a car without changing the pistons is NOT bad for the car. Most factory parts are bit underrated and will take the power. And a part like pistons is easily saved with a proper tune. Its the rods that are the problem, no the pistons.

Giving a car a higher rating octane fuel does not destroy the motor in any way, make its life shorter, or give it more power than it has. Giving your car a higher octane fuel will only give benefit if it is tuned for it. Its not a magic fuel that gives slightly more power to a regular car and does not damage your car if your recommended fuel is regular grade.
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