John M Posted August 18, 2004 Share Posted August 18, 2004 Dont' worry at all. You don't have to stay out of the boost, you don't have to drain it, you don't have to do anything but accept the fact that you'll be 10-20 hp less than stock until about halfway through the new tank. DO NOT put premium in until the tank is almost EMPTY. Filling up with half a tank just doubles the amount of time that non-premium octane is going into the engine. And not to hijack the thread, but how does NJ justify not having self serve gas? Are they stuck in the 70s? Is it a union thing? Are the lawmakers just stupid? Link to comment Share on other sites More sharing options...
rao Posted August 18, 2004 Share Posted August 18, 2004 The engines are different. The exterior dimensions are the same (and most of the inside dimensions as well), but the block, crank, rods, pistons, heads, valves and cams are different) Just use the gas that is in there and relax. If you are concerned then stay out of boost, with the low compression ratio of the motor you could put almost anything in there and it would not knock when it is not under boost. I am amazed at how delicate people think these cars are, and at the same time how amazingly amazing they are. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
GardenWeasel Posted August 18, 2004 Share Posted August 18, 2004 Congrats. This topic was on my list of Top Ten Topics I Can't Wait to Read. :D Just drive it. [quote name='Information Society'] My advice is to buy some octane booster and add that to your tank. I don't think the turbo should be damaged, but you might want to take it easy.[/quote] You'd have to add an awful lot of octane booster to make a difference: [quote]Notes: Common ingredient in Octane Boosters in a can. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Often costs $3-5 for 12-16 ounces, when it can be purchased for less than $3/gal at chemical supply houses or paint stores.[/quote] [url]http://www.vtr.org/maintain/gasoline-octane.html[/url] Link to comment Share on other sites More sharing options...
zcarmob Posted August 18, 2004 Share Posted August 18, 2004 Now that someone put the wrong gas into the tank yuo are going to have to sell the car. :D Your car is now worth one dollar. but I will be nice and buy it from you for two dollars. LOL. :D Just drive the car and don't worry about the gas. Just fill-up next time with the right kind. Link to comment Share on other sites More sharing options...
godwhomismike Posted August 18, 2004 Share Posted August 18, 2004 [quote name='John M']Are the lawmakers just stupid?[/quote] Maybe I'm missing something, do you know any smart ones? :lol: Hell, a law is being passed in I believe SF today making it illegal to use silly string, and the fine for breaking this law will be between $200 to $1000. :evil: For the love of God, stop wasting my hard earned money that you take for taxes and do something to help the country - like fight terrorism, or just make this country a better place. I believe that these elected officals make bundles on money and never know what their job is so they create silly laws and amendments to justify being in office. - Mike Link to comment Share on other sites More sharing options...
tallguylehigh Posted August 18, 2004 Author Share Posted August 18, 2004 Yeah, now that I look back on it I realized that I kind of over reacted a little bit. Tehe. From now on I am going to watch these guys like hawks to make sure they put in the gas that I want in there. Well, at least I can look at this as a way of helping people in the same situation the embarassment of asking the question themselves. Its like im a hero... yeah, an American patriot!! :D Link to comment Share on other sites More sharing options...
Th3Franz Posted August 18, 2004 Share Posted August 18, 2004 Yeah just try to stay off boost (<4000 RPM) until you burn through the tank of gas and it should not be a problem. -Franz The end of a Legacy http://www.youtube.com/th3franz Link to comment Share on other sites More sharing options...
il collaudatore Posted August 18, 2004 Share Posted August 18, 2004 Do you havve to use premium with the 2.5GT? What would happen if you use regular? Would you just get less power? Or would you actually be damaging the car? Link to comment Share on other sites More sharing options...
SUBE555 Posted August 18, 2004 Share Posted August 18, 2004 As long as you don't seriously load the engine, you should be alright. How much was left in the tank when you filled up? Using 93 before? You could run it down 3-6 gallons and put in 93/94 for a bit of insurance if you are all that worried. il collaudatore, the car is mean't to use premium fuel, which is there to reduce premature detonation from the higher dynamic compression when you are under load with boost. If you use regular fuel, it's not recommended to get on it at all as damage could occur if it detonates heavily. Some STi's have had detonation on 93/94 octane fuel with extremely advanced timing, thus I wouldn't go less than the recommended fuel grade. You sure will cut back on the fun if you want to save yourself a few bucks in the short term. Link to comment Share on other sites More sharing options...
il collaudatore Posted August 19, 2004 Share Posted August 19, 2004 Oh wow, didn't know that. My current car, Car and Driver did a test between regular and premium fuel performance. Surprisingly, the regular fared better and the manufacutor said to use premium gas- which is why I asked about the 2.5GT. I've been using regular ever since and the car has been running fine. And since my only other car I've own was an I4 camry, I really never did see a difference between the fuels. So you can see where my doubt in using premium fuel is coming from. Link to comment Share on other sites More sharing options...
SUBE555 Posted August 19, 2004 Share Posted August 19, 2004 Turbocharged and naturally aspirated with modest compression ratios are much different. I'd have to look up what they dynamic compression ratio was, but it's a bit higher than the N/A model when you factor in the extra air being crammed in. That's how it makes the power, more air + more fuel = more power. The higher compression ratio (dynamic or static), the more liklihood you will see premature detonation of the mix. That's a BAD thing. In certain situations it 'CAN' leave you with parts of your engine becoming shall I say, unattached, like pistons, conrods, and parts of the block to name a few. Now that isn't the case in many instances, but getting on boost with low octane fuel quickly increases the chance for damage from premature detonation. There is a reason why they RECOMMEND premium fuel, so you can use it's capabilities it is intended for. An engine will live with the lower octane fuel and taking it easy, but then you might as well should have just bought the 2.5i if you didn't want to pay for premium fuel and have fun with boost. Link to comment Share on other sites More sharing options...
c_hunter Posted August 19, 2004 Share Posted August 19, 2004 Use up half a tank and then fill it up with premium, highest octane you can find. Then run that tank down and put in the right gas next time. There will be no ill effect from lower octane except slightly lower performance. Craig Link to comment Share on other sites More sharing options...
outahere Posted August 19, 2004 Share Posted August 19, 2004 Park it overnight on a New Jersey street, with the gas cap off, and a 5 foot length of hose nearby, and in the morning all the gas will magically be gone. :D Link to comment Share on other sites More sharing options...
mtarone Posted August 19, 2004 Share Posted August 19, 2004 Here in Australia, I was told by my dealer that I can use regular unleaded fuel if I can't find an premium around, but "try not to make a habit of using regular". Since our cars have knock sensors and advanced ECU's, the timing will retard before any pinging or detonating becomes fatal to the engine. -Matt Link to comment Share on other sites More sharing options...
MSB Posted August 20, 2004 Share Posted August 20, 2004 In Oz are you recommended to use 98 RON? Be interesting to find out about what the guys in the UK that have imported JDM spec Bs do for fuel, as they recommend 100RON for the specB whilst the best they can get in the UK is 98. Would this cause problems in the long term? Link to comment Share on other sites More sharing options...
mtarone Posted August 20, 2004 Share Posted August 20, 2004 Yep we have 98 Premium here. Link to comment Share on other sites More sharing options...
agctr Posted August 20, 2004 Share Posted August 20, 2004 I think u will be more than fine, unsure if one tank is really going to kill anything, just make sure that next time yr on the right juice. Best of luck Adam. Link to comment Share on other sites More sharing options...
aikibob1 Posted August 21, 2004 Share Posted August 21, 2004 AMSOIL makes a couple of octane "boosters" and STP also claims to have such a product. Might be handy to have in one of those trunk tray compartments. ________________________ AMSOIL Octane Boost reduces engine knock, improves ignition, helps fuel burn cleaner and inhibits corrosion. Recommended for all high performance off-road and racing applications. Increases octane number by up to 7 points. Link to comment Share on other sites More sharing options...
mmanus88 Posted August 21, 2004 Share Posted August 21, 2004 my cousin drives an acura mdx, which of course uses premium. he uses regular all the time because of current gas prices. you will not degrade your engine, or cause problems. u'll notice a performance difference and thats all Link to comment Share on other sites More sharing options...
fan42025 Posted August 21, 2004 Share Posted August 21, 2004 [quote name='mtarone']Yep we have 98 Premium here.[/quote] In Japan they use 102RON. More power yet again! Link to comment Share on other sites More sharing options...
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