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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 10-11-2008, 11:06 PM   #1
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Question What Octane will the SS be rated?

What Octane will the SS be rated?
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Old 10-11-2008, 11:07 PM   #2
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Premium is recommended, but it can run on regular with lower performance.
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Old 10-12-2008, 12:32 AM   #3
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can regular harm the engine ill probally just put premium in it anyway though
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Old 10-12-2008, 12:35 AM   #4
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(R+M)/2 91 octane.
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Old 10-12-2008, 06:50 AM   #5
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same as the vette - premium
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Old 10-12-2008, 07:18 AM   #6
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dont use regular on performance engines...my truck has a 5.7 hemi and i put regular even though midgrade was recomended and I had to flush out my engine a month ago at 30000 miles cuz of all the crap that built up in my engine.

so please use the grade recomended.
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Old 10-12-2008, 09:15 AM   #7
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dont use regular on performance engines...my truck has a 5.7 hemi and i put regular even though midgrade was recomended and I had to flush out my engine a month ago at 30000 miles cuz of all the crap that built up in my engine.

so please use the grade recomended.

That is a myth. Flush out what part of your engine? Do you mean cleaning your injectors? Or something else? Any fuel will leave carbon deposits on your valves/combustion chamber, it is part of the combustion process. Some may be worse than others if you believe the advertising, but it is definitely not related to octane.

As to the recommended octane, if you really want to save the money and you always take it easy driving, you could use regular. But who buys a v8 camaro to baby it? I recommend premium, for an extra $5 a week to get the performance you paid for in the car seems worth it to me.
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Old 10-12-2008, 01:36 PM   #8
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I recommend premium, for an extra $5 a week to get the performance you paid for in the car seems worth it to me.
Depends on where you live though. Here premium is $1.50 more then regular at the low end and now is as much as $2 more per gallon. Mid grade isn't much better running about $1 more then regular per gallon.
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Old 10-12-2008, 02:16 PM   #9
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I'm thinkin about premium for one fill up and then mid-grade the next...is this a bad idea??
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Old 10-12-2008, 02:21 PM   #10
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Depends on where you live though. Here premium is $1.50 more then regular at the low end and now is as much as $2 more per gallon. Mid grade isn't much better running about $1 more then regular per gallon.
Holy crap, I live in the communist state of California and premium is only 30-40 cents more a gallon.
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Old 10-12-2008, 03:10 PM   #11
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Depends on where you live though. Here premium is $1.50 more then regular at the low end and now is as much as $2 more per gallon. Mid grade isn't much better running about $1 more then regular per gallon.

Wow, that is ridiculous. Sounds like an additional state tax because it definitely does not cost that much more to produce.
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Old 10-12-2008, 04:52 PM   #12
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Depends on where you live though. Here premium is $1.50 more then regular at the low end and now is as much as $2 more per gallon. Mid grade isn't much better running about $1 more then regular per gallon.
Is that a gallon or a tank? Do you live far from the city because gaspricewatch lists premium as being 30-50 cents more a gallon in most cities in west NC. I feel for you if you don't live near a city with gas competition. I remember when I lived in California and the gas prices were about $2 - if you traveled through the mountains or desert, the crooks were charging $4.50 a gallon. Biggest sleezbags in the country - should be shot in the streets taking advantage of people like that
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Old 10-12-2008, 05:26 PM   #13
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Depends on where you live though. Here premium is $1.50 more then regular at the low end and now is as much as $2 more per gallon. Mid grade isn't much better running about $1 more then regular per gallon.
That's insane. There's about a 20 to 25 cent difference between the grades here.

Regular is currently $2.85 and I believe Super/Premium was $3.13.
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Old 10-12-2008, 05:32 PM   #14
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Depends on where you live though. Here premium is $1.50 more then regular at the low end and now is as much as $2 more per gallon. Mid grade isn't much better running about $1 more then regular per gallon.
Damn... you need to email your congress person!!

We've got a 10 - 20 cent premium tops
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Old 10-12-2008, 07:41 PM   #15
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Yes as of yesterday when I filled up regular was $4.19 at the cheapest place in town and premium was $5.99, but it's also the 1st time I've seen any premium since Ike. Before Ike, premium was about 40 cents more so hopefully it will come down.
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Old 10-12-2008, 09:56 PM   #16
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word of warning don't put sludge in your car. if i don't put 91 in ALL 2.4's knock so if they recomend it then guess what you should do it /thread
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Old 10-14-2008, 03:09 PM   #17
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Myths are hard to overcome. You can run regular just fine with the only consequence being slightly worse mileage, and slightly less power. You'd have to find out if the economics of it are worth it by testing how far your mileage drops when using regular versus the premium you pay for premium gas, then weigh in the performance drop. Also, you aren't going to hurt anything by mixing it up - doing premium, then mid-grade etc.

I currently have a premium only turbo, and can still mix it up. The LS3 is a premium recommended, not premium only (which is just "even more recommended"), so should be no reason other than those I listed for not using regular if you so chose.
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Old 10-14-2008, 05:35 PM   #18
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Myths are hard to overcome. You can run regular just fine with the only consequence being slightly worse mileage, and slightly less power. You'd have to find out if the economics of it are worth it by testing how far your mileage drops when using regular versus the premium you pay for premium gas, then weigh in the performance drop. Also, you aren't going to hurt anything by mixing it up - doing premium, then mid-grade etc.

I currently have a premium only turbo, and can still mix it up. The LS3 is a premium recommended, not premium only (which is just "even more recommended"), so should be no reason other than those I listed for not using regular if you so chose.
You definitely hit the nail on the head about mixing grades of fuel. In case anyone is wondering gas stations don't have mid grade tanks, they just mix premium and low grade fuel to get mid grade.

Although running an engine on too low a grade of fuel can cause problems and severe ones at that. You won't find low grade enough fuel in north america, you have to travel to find those types of fuel.
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Old 10-14-2008, 08:17 PM   #19
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Knock sensors in the engine will allow the engine management system to make the necessary adjustments that will allow you to run lower grade fuel without immediate damage to the engine. But, dependent on several conditions, you will likely suffer some loss of power and lower fuel economy when compared to using the recommended higher grade fuel under the same conditions. What you might save at the pump will likely be wiped out by poorer fuel mileage.

They built the engine to perform at it's peak using the premium fuel. I'm going to believe the engineers knew what they were talking about when they recommended premium fuel. Mine will never see anything less then 91.
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Old 10-16-2008, 08:57 PM   #20
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Both my GM cars say premium fuel and I only use 87, my Camaro has 140k and GTP 125k. No problems, performance or mileage. I will use 87 in my new SS, the computer will adjust.
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Old 10-17-2008, 05:16 PM   #21
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Both my GM cars say premium fuel and I only use 87, my Camaro has 140k and GTP 125k. No problems, performance or mileage. I will use 87 in my new SS, the computer will adjust.
the computer will adjust and you will lose performance and possibly gas mileage.

not running the proper grade of fuel will cause the computer to pull timing.... all the time, which will not allow the engine to run at peak performance.
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Old 10-17-2008, 05:22 PM   #22
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All I know from experience is that when I put regular or even mid in my Trans Am, it knocked like a son of a bitch. Went right back to premium.
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Old 10-17-2008, 10:25 PM   #23
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Yes as of yesterday when I filled up regular was $4.19 at the cheapest place in town and premium was $5.99, but it's also the 1st time I've seen any premium since Ike. Before Ike, premium was about 40 cents more so hopefully it will come down.
This sounds almost unbelievable, but, it is a result of hurricane Ike. The pipeline that takes mogas to that part of the country were almost empty when the refineries in Houston went down. No gas being made so no gas to put into the pipeline and pump to you guys. It will get better as most of them are back up and running now. My guess is they had to raise the price so high so only those who really needed it would buy it. That will go away very soon and you will have the normal spread between grades like the rest of us.
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Old 10-17-2008, 11:54 PM   #24
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Yeah, here in Missouri we have the lowest prices in the country thank god. 2.79 for 87 and 3.09 for premium. I buy premium even though I've heard all the stories about how you can get away with 87.

Like Camarospike says. It'll pull timing and i bought a 400hp car to have 400 hp. And I'm not going to give it up for a few bucks a tank. Not to mention if I'm losing gas mileage I'm probably nixing any savings made by paying 30 cents less by having to fill up more often.
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Old 10-17-2008, 11:57 PM   #25
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You also have to remember you get better mileage with higher octane fuel, is it enough of an improvement to make up for the price difference? I don't honestly know but it makes up some of it, and the extra ponies can justify the difference.
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