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Old 03-16-2008, 10:04 AM   #1
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Premium Only?

Hey guys, I'm wondering if when it says "premium only" by the fuel does it really mean it? I know its made for it but, my dad doesn't think it matters ( he pays for the gas) and he puts regular in it. I'm just wondering what that decrease in octane will or can do to the car. Also It seems like it idols a little rough, is that because of the fuel?

Thank you

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Old 03-16-2008, 10:24 AM   #2
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Yes it matters. They put it on for a reason and that is because the compression inside the engine is higher than most regular cars, so please don't blow it up and spit out the extra 20 cents to get 91...
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Old 03-16-2008, 10:26 AM   #3
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The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.

The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.
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Old 03-16-2008, 10:31 AM   #4
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Good answer guys +1 Rep!

Vapid tell your dad to buy premium.
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Old 03-16-2008, 11:22 AM   #5
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i was using regular before, i started using 91-93 after i saw a few threads. honestly its paying an extra 3 or 4 dollars per fill up. i feel better now and im not playing guessing games whether there will be detonation or not. for some reason in the chitown area i see alot of 93 instead of 91.
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Old 03-16-2008, 11:41 AM   #6
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If im not mistaken, the higher octane fuel has more detergents in it that help clean, and keep clean the engine.
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Old 03-16-2008, 01:21 PM   #7
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The SVT is tuned for premium fuel only. Trying to save money by buying low buck stuff is just going to hinder what the engine can really do.

On standard ZX3's the story's the other way around. Putting premium fuel in instead of regular unleaded just chokes the EGR system and causes coking in the hardlines and destroys the EGR valve and sensors. Believe me, I found that out the hardway in the past and had to replace the entire EGR system.
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Old 03-16-2008, 01:35 PM   #8
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my svt always sips on that 93
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Old 03-16-2008, 01:57 PM   #9
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Octane

87 oct???

Gas Light & Gas Type

SVT Octane Requirements?

aight gas question (performance)????

SVT Octane

Svt Owners! 91 Octane, Yes? No?

89 octane in my svt

high octane for stock svt?

and so on...
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Old 03-16-2008, 07:49 PM   #10
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CaysE, thanks for the links. i explained detonation a few days ago along with the importance of doing what the manufacturer recommends.

Vapid, tell you ol' man that he doesnt know anything about cars.

oh, and this one will be closed for the same reason the others have been...
Let thy search button be your friend

::CLOSED::
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