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Old 12-11-2005, 04:58 PM   #11
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& I belive the fuel additives you are thinking about using are not quite the same as using high octane fuel. If you read the fine print on the back of those bottles you will see when they say ie "increase octane up to 8 points" really means .8 octane points. Someone correct me as if I'm wrong there.

But If I were you I would really use atleast 91.
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Old 12-11-2005, 05:16 PM   #12
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yes Fule addtitives have a LITTLE effect on the overall octane rating.....less than a half a point depending on the amount of fuel in the tank
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Old 12-12-2005, 09:41 AM   #13
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Quote:
Originally Posted by toastedoats
With forced induction ( supercharger or turbocharger ) a higher octane gas is always recomeneded. The supercharger increases cylinder pressure, and when under load, wide open throttle, high boost, and hot coditions, this extra pressure can cause the engine to ping or even prmaturely detonate resulting in a burned valve or piston. The use of premium fuel makes the likelyhood of this from hapening lessen greatly.
However, if pinging does occur, the computer measures this through the knock sensor, and will retard the timing to help correct the problem. Sometimes this is not enough however, and the pinging will continue and cause serious internal damage, also fuel mileage and performance will suffer.
To add onto our local SC'd engine expert.
Most find that the MPG is dramatically increased by using 91-93 versus lower grades. I did drive 200 miles once w/o abusing the pedal too much and achieved 33.5mpg. Doubt lower grades would have done that for me.
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Old 12-12-2005, 02:54 PM   #14
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no one can give you a definitive answer to your question, all we can do is give you an opinion. that said , i have over 50,000 of 113,000 miles run on 87 octane , so far so good ,no harm that i can tell. i get 28 to 29 mpg at 70 mph on the flat, less (a lot less) in the mountains with my 3.33" pulley.

ROD
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Old 12-13-2005, 10:53 AM   #15
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[quoteOne last thing, does anyone have anything to say about Lucas Oil Additive/Stabilizer VS Synthetic. It seems like a cheap alternative and I have heard nothing but good things about it. Thanks again for all your help[/quote]

I haven't! Do a search on bobistheoilguy on google, and you will eventually come across a website as to why additives should NOT be used in any engine, unless its on its last breath!
Figure a jug of oil to fill the crankcase costs about 15 dollars with today'* prices. another 15 for Lucas junk, and you have 30 dollar oil in there. Take that 30, and spend it on 4 liters of synthetic oil. Mobil one is the best. and use whatever grade the manufacturer reccommends. The 91 type one engines used 10w30, i imagine the newer ones use 5w30. But check!!

You see, I think Lucas is overhyped, and as long as you take care of the engine, it'll last as long as you want it to. WITHOUT the lucas.
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Old 12-13-2005, 12:17 PM   #16
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Quote:
Originally Posted by rrounds
no one can give you a definitive answer to your question, all we can do is give you an opinion. that said , i have over 50,000 of 113,000 miles run on 87 octane , so far so good ,no harm that i can tell. i get 28 to 29 mpg at 70 mph on the flat, less (a lot less) in the mountains with my 3.33" pulley.

ROD



Have you ever scanned your car? 87 Octane with a 3.3 pulley is suicide.
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Old 12-13-2005, 07:07 PM   #17
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i did not say that right, i need to proof read before i post. i ment to say i get less mpg in the mountains with the stock 3.8" pulley and alot less mpg with the 3.3" pulley, that said, i do use premium fuel with my 3.3" pulley. with the stock 3.8" i have not had any trouble with around 50,000 miles so far using 87 octane gas.

ROD
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Old 12-13-2005, 07:13 PM   #18
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Quote:
Originally Posted by rrounds
i did not say that right, i need to proof read before i post. i ment to say i get less mpg in the mountains with the stock 3.8" pulley and alot less mpg with the 3.3" pulley, that said, i do use premium fuel with my 3.3" pulley. with the stock 3.8" i have not had any trouble with around 50,000 miles so far using 87 octane gas.

ROD
good, you were scaring a few of us
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Old 12-13-2005, 08:13 PM   #19
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Ok let me explain this to you. If you read on your dashboard it says "Premium Fuel Only", that means only use premium. You will get better gas mileage (which when you do the math actually does end up saving you money) and you won't be messing up your engine.

This is why your engine needs premium fuel.

With a supercharger you are compressing air into the engine for more power. Anytime to compress air, you generate heat. Roots blowers are especially inefficient and create a lot of heat. So this hot air is being fed into the cylinder. So you have a lot of cylinder pressure and it is hot so this can actually cause the fuel in the cylinder to ignite before the spark plug fires, this can cause burnt valves and chipped pistons, both of which are obviously an expensive fix. The higher the octane fuel you get, the slower it burns. So if you use premium gas then it will take more heat and higher cylinder pressures to ignite the fuel before the plug fires. This means you are less likely to get burnt valves, chipped pistons, etc...

If your car did not need premium gas the manufacturer wouldn't tell you its required. People take the type of gas the car requires in consideration when buying it, so a car that takes premium probably won't sell as well as the same car that requires regular gas, so the manufacturer is probably losing sales due to it requiring premium fuel, so obviously they feel that the car must need the higher octane gas because otherwise they wouldn't require it because it hurts their sales.

Shawn
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Old 12-14-2005, 03:20 AM   #20
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SHAME SHAME SHAME!!! On you [wug]. May the Great Pontiac Gods strike you down and turn you to ashes !
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