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Premium only?????
I have a 05 Supercharged SS that recommends premium in the manual. I'm looking for technical info that supports a certain octane level.
My other car is a Supercharged Corvette so I understand octane requirements but this car is driven a lot of hwy miles by my wife, neverhits boost, and the premium is expensive if 89 octane will suffice...............opinions please???? Thanks, Randy |
RE: Premium only?????
I have an 04 supercharged and alternate the fuel. If I am just commuting back and forth to work or just driving on the highway I use regular or mid-grade. If I am feeling a lead foot coming on I will use premium. As long as your foot is not in the peddle all of the time you will be allright using less then premium.
If you run regular and have your foot in it all of the time you could cause damage to the engine. Others may differ with this, but it seems to work well for my situation. |
RE: Premium only?????
I believe 91 octane is what is recommended by GM.
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RE: Premium only?????
If you run 89, scan for knock. Period. on 89, your engine WILL knock under boost, and more than likely, enough to start chipping pistons.
Lets see.. 89 octane.. 3.09. 93 octane 3.29. new engine? 1200.00 is it worth saving 20 cents a gallon to risk blowing your engine, not to mention voiding factory warranty, and taking a chance at losing a beautiful car? nope. Just my opinion, but if you wanna run just 89, may as well just pull the supercharger, and toss 87 in it. |
RE: Premium only?????
At 20 cents a gallon difference, if it holds 17 ga. like mine, then you save $3.40 per tank if bone dry.
My mom used to dry me crazy. We had a 3 cylinder Geo Metro (= EXCELLENT mpg), We always used it to go to Kansas and she would drive around trying to find the cheapest gas. The difference was usually only about 3 cents a gallon difference, the car held a whopping 9 gallons, so she was saving, at most, a grande total of 27 cents. I finally told her, it's our car, I'll pay the difference, LOL. (we used our, mine & hubby's, car and she paid for the gas) |
RE: Premium only?????
well about hte high grade thing... every station i see around here, except for some in norfolk, the difference has always been 20 cents a gallon. from tiem to time its 24 or 26... but most of the time its 20. so... no matter what the price of gas, its really just another $3.40 on top of that to fill up....
I go along with Keegan... $3.40 at every fill up or a new engine at $1200? As a matter of fact, $1200 sounds kind of low.. that just the engine. what about the downtime? I've run 87 and 93 in my naturaly aspirated engine. i get 2 miles better per gallon. until it costs about $8-10 more dollars to fill up my car with 93, the higher grade is paying for itself. btw, don't trust that comptuer. some people here claim theres is spot on... thats all well and good, and i hope they are glad. mine is about 1.5-2 miles off. |
RE: Premium only?????
I took that into consideration when I bought this car. I figured it would cost me about $1,000 more over the 3 years I intend to drive this commuting. I bought this car CHEAP, so I just figure that is part of the monthly expense of driving, like tires, LOF, and other maintenance, and of course the payment. Hard to figure in the costs of the modding, tho.
I run ONLY 93 octane Top Tier gas, either Amoco Ultimate, Shell V-power, or in a bind, Citgo premium. I NEVER run independent generic gas. |
RE: Premium only?????
I go along with Keegan... $3.40 at every fill up or a new engine at $1200? As a matter of fact, $1200 sounds kind of low.. that just the engine. what about the downtime? Engine, impala, monte carlo, federal, w/supercharger - 3.8l - 3.8L 2004 N/A $2,719.60 Granted, perhaps a little overkill to get a new engine. But if it chips, you're looking at pulling the engine, having to bore it over .10, along with buying new pistons (900-1000) along with having to completely re-assemble the engine, etc. Is it worth the above said 3 dollars per fill up? If you are THAT short on cash, I WILL HELP TO PAY YOU. And if you are still THAT hard up to save your engine from failure, sell it, and buy a standard non s/c 3800. |
RE: Premium only?????
I always put Sunoco 94 octane in my 04 Supercharged SS. Firstly because of what the others have mentioned about how expensive a damaged engine is to fix or replace. But also I like the extra "oomph" I get from the higher octane.
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RE: Premium only?????
ORIGINAL: ExplosiveSoundz Granted, perhaps a little overkill to get a new engine. But if it chips, you're looking at pulling the engine, having to bore it over .10, along with buying new pistons (900-1000) along with having to completely re-assemble the engine, etc. Is it worth the above said 3 dollars per fill up? |
RE: Premium only?????
Hmm.. That would give me an excuse to upgrade to the Diamond Pistons to run more boost.... :) |
RE: Premium only?????
Since Regular Gas contains a low, double-digit percentage of Ethanol ... which contributes to Detonation and Pre Ignition ... I'd say that running Higher Octane is a very good idea.
My Bike was "Pinging" pretty badly on the 10~12% Ethanol ... so, I quit running Regular in it and moved-up to High Test. If you are running Regular Gas and hear the engine Knocking ... just remember this. THAT "Knocking" ain't opportunity. It's BAD news for the Engine Parts. |
RE: Premium only?????
You actually don't hear the engine knocking, really. It's doesn't sound like you are thinking, in which you can actually hear the cylinder pre-detonating. But regardless, go Premium =)
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RE: Premium only?????
I would go premium and that will leave out any worrying about blowing the engine because you never know if you need to gun it to avoid an accident.
Not to hijack, but Keegan - I noticed in your sig you are going to run the GenV and the S3 intercooler, did they guys at ZZP garauntee that they will fit under the hood? |
RE: Premium only?????
ORIGINAL: Taz I always put Sunoco 94 octane in my 04 Supercharged SS. Firstly because of what the others have mentioned about how expensive a damaged engine is to fix or replace. But also I like the extra "oomph" I get from the higher octane. Low grade gas explodes faster and easier than high grade andgives more oomphto low compression engines. It takes a lot more compression to get the high grade to fire properly. The reason you don't get the oomph with low grade in the high compression engines is because the gas fires to quickly or 'pre-detinates,' thus the pinging. So like goldilocks, the regular is "too hot" or too oomphie for your car where the premium is "just right." |
RE: Premium only?????
Not to hijack, but Keegan - I noticed in your sig you are going to run the GenV and the S3 intercooler, did they guys at ZZP garauntee that they will fit under the hood? I actually moved the date to end of May, as military stuff will interfere until then... But I am extremely, EXTREMELY excited to bolt on over 100 WHP in just two days. =) ---- End Thread Hijack, Although I noticed the original question asker hasn't replied to this post for over a week----- |
RE: Premium only?????
hmmm with my 350 and the mods done to it i only put in premium as well... i tried to start it once off of regular grade gas, i had run out of gas and threw some from a near by persons house, who had a lawnmower, in it, and the damn thing wouldn't even start, and i mean i put like 2-3 gallons in the tank... so i would reccomend the premium...
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RE: Premium only?????
That's why cars that run on regular don't see an improvement on power or performance by running premium. What they DO see is a quality difference. They will go from crap generic gas to top tier premium, and say it runs better. IT DOES! They went to top tier gas! Even cheap premium is better than the junk regular.
Side note: Our shop janitor just had his Bronco II towed from the shop. Too much water in the gas, and it wouldn't run. Everything froze. He's been running brand S, the CHEAP stuff, and buying it in the town where he lives. I've been running BP Amoco gas for about 20 cents a gallon less for regular than what he is paying, and I have ZERO problems with water (knock on wood). Is the cheap gas cheap if you have to keep adding dry gas and fuel injector cleaner to keep it running? I haven't bought a can of dry gas in YEARS! I run a can of SeaFoam once a year, just because. My 2 cents. |
RE: Premium only?????
ORIGINAL: RocknSS04 That's why cars that run on regular don't see an improvement on power or performance by running premium. What they DO see is a quality difference. They will go from crap generic gas to top tier premium, and say it runs better. IT DOES! They went to top tier gas! Even cheap premium is better than the junk regular. Side note: Our shop janitor just had his Bronco II towed from the shop. Too much water in the gas, and it wouldn't run. Everything froze. He's been running brand S, the CHEAP stuff, and buying it in the town where he lives. I've been running BP Amoco gas for about 20 cents a gallon less for regular than what he is paying, and I have ZERO problems with water (knock on wood). Is the cheap gas cheap if you have to keep adding dry gas and fuel injector cleaner to keep it running? I haven't bought a can of dry gas in YEARS! I run a can of SeaFoam once a year, just because. My 2 cents. You can do that cheaper with a bottle of $2.00 addative every handful of fillups. In reality, you loose gas mileage with premium on a "regular" engine because some gas goes unburned. Many website I've been on report a couple of miles more per gallon with regular than with premium on low performance engines. Now with VVT and VTEC, premium is no longer necessary for performance. |
RE: Premium only?????
X2. The detergents clean up the gunk that develops on the valves and helps the car run better. You can also run some E20 through and that will clean it up a bunch as well.
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