03-17-2008, 08:32 AM
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type of gas
I have a 2008 sport coupe. I have read in numerous articles that the 2.4 engine that I have in the sport is borderline where you should use Premium gas. I know the SS engine does but was wondering about the sport model I have.
I find it weird that it would need Premium but as i said there have been reviews done on it saying you should use it. Anyone know for sure?
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2008 Coupe Sport. No engine mods as of yet, don't want to void the warranty. Black tinted windows, black chevy bowtie, chromies, silver racing pedals. That is it for now. 
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03-17-2008, 09:41 AM
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It is "recommended" that you use premium 91 octane for the 2.4L engine. However, i have been using regular since i got mine and i havent had any problems. 91 octane will just give you slightly increased performance, but 89 wont hurt it.
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2007 Cobalt SS/NA   Performance:K&N short ram intake, Purple Hornies glasspack, Jet Stage 2 Visual: color match bowties, shorty antenna, blue footwell led's, partial debadge Coming Soon:Vibrant 4-2-1 Header/DP
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03-17-2008, 09:59 AM
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That is what I thought. Is the performance using 91 noticable?
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2008 Coupe Sport. No engine mods as of yet, don't want to void the warranty. Black tinted windows, black chevy bowtie, chromies, silver racing pedals. That is it for now.
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03-17-2008, 10:20 AM
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ss/na=sport= prem
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03-17-2008, 10:27 AM
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Quote:
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2007 Cobalt SS/NA Performance:K&N short ram intake, Purple Hornies glasspack, Jet Stage 2 Visual: color match bowties, shorty antenna, blue footwell led's, partial debadge Coming Soon:Vibrant 4-2-1 Header/DP
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06-18-2008, 09:13 PM
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Not sure how the ignition system on our cars work, I never looked into it. But I wouldn't spend the extra money for it if you can't even notice it, especially with the price of gas now.
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06-18-2008, 09:18 PM
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i run premium in my tank. ive been running it since i got the car. i think it may be in my head but when i put in regular i feel like my car runs like dirt. and for 25 cents extra...oh well.
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06-19-2008, 11:17 AM
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The higher the octane level, the less amount of carbon build up you get. Thats why high performance cars like vettes and mustangs use 91. The injection system clogs less. I put 91 in my 2.2 once or twice a year, just to help clean things up a bit. Theres no noticable difference though.
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'05 Base Coupe, Blue, 2.2L, 5 speed manual, Too many mods to list in this signature. I'll just say insanely loud system, fully upgraded suspension (nothing original), Intake, Full Exhaust from the engine back, Rims, Tires, etc... Give me about a month to get back stateside and pics will be posted in the vBGarage.
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06-19-2008, 08:51 PM
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Any "difference" you might feel is in your head. Octane has nothing at all to do with your cars power, all it does is have a higher resistance to knock which is why high compression and FI engines use it. It's nothing more then that.
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Repopulating yourcobalt.com one post at a time. 
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06-20-2008, 11:57 AM
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couldn't we all just go Hydrogen instead of paying over 4 dollars for gas:P
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2006 Chevy Cobalt LT Synthetic oil K&N air intake system Custom 2.5" dynomax exhaust system B&M shiftplus Catless Downpipe stainless steel pacesetter header
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