ragingfish
GenVibe God
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Clarksburg, NJ
Joined 10-15-2002
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| Re: 87 Octane in a GT (mrsamwong) | « » 8:38 PM 10/12/2003 |
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You don't hear knocking because the engine has a knock sensor. If it detects an inferior octane gasoline in the engine, it retards the timing to prevent knocking.Your results: poor performance, and over an extended time, possible engine damage. The engine is NOT designed to run on regular fuel. You must use premium, or any fuel 91 octane or higher. While you notice no ill effects now, you CAN damage the engine in the long term... Read this thread for more on this topic:  http://forums.genvibe.com/zerothread?id=3421
YES!
I still visit GenVibe routinely. I have not forgotten about my "original" family over here!2006 PONTIAC G6 GT COUPE (AKA the Karmic Nightmare  )
3.5L 3500 V6 SFI (201 HP @ 5600 rpm, 222 lb-ft @ 3200 rpm)
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silverawd26
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SE MI
Joined 12-28-2002
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| Re: 87 Octane in a GT (mrsamwong) | « » 8:38 PM 10/12/2003 |
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quote:
Hi everyone, I'm new to this site and have a question. I just bought my Vibe GT at the end of the summer and I've been putting 87 octane in it. I haven't noticed any knocking or anything yet. How or will the lower octane fuel damage my engine? Sam
Yes, it can damage the engine. You must use premium fuel. 
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goodvibe
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chicago IL
Joined 7-28-2003
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| Re: 87 Octane in a GT (mrsamwong) | « » 10:12 PM 10/12/2003 |
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The poorer fuel mileage you're getting with the timing retarded will help offset the extra cost of premium. Was this by accident or for savings?
Vibe GT, TRD springs, Progress bar, STB, Unichip, Borbet E 16x7.5, 225/50 Bridgestone RE750, beefed up grounds and battery bypass capacitors(had em laying around)
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Flip-Side
GenVibe God
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1090 posts
Waterford MI
Joined 9-13-2002
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| Re: 87 Octane in a GT (mrsamwong) | « » 10:30 PM 10/12/2003 |
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quote:
I haven't noticed any knocking or anything yet. How or will the lower octane fuel damage my engine?
Its a good question Sam, so don't get put off by our responses. YET, is the key word here though bro. As the others have said, 87 octane isn't good for the GT. I didn't understand why the higher octane was needed at first either. But once I learned more of how the GT engine worked, it made more sense. The GT has higher compression (crushes a larger amount of air and fuel) than a normal vibe. Low octane gasoline can detonate at the wrong time, from the high compression alone and not the spark. That is why 92 octane is needed. If you dont hear knocking, I assure you that you are still suffering from hesitation, lower hp and torque, worse fuel economy, and shortened engine life. Simply put, if you use cheaper low-octane gas, it won't detonate correctly in your GT engine. 
Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for.
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coratz
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ont
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| Re: 87 Octane in a GT (Flip-Side) | « » 1:56 PM 10/13/2003 |
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boy are you in for a preformance gain when you splurge on the good gas!!!!! as soon as your on empty go to sunocco and get some 94!!!!!!!!!!!! AND REV HER TO 8200!!!!
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TopObject
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Winona MN
Joined 8-30-2003
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| Re: 87 Octane in a GT (coratz) | « » 8:27 PM 10/13/2003 |
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You're lucky to have 94. Here in Minnesota its 91 or 92.
And our gas is 10% corncobs too. Doh!
Freedom is what you do with what's been done to you.2003 Vibe GT
Two-Tone Lava
So far so stock... must convince the lady that mods are a good investment!
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LavaMyVibe
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Toronto on
Joined 7-12-2003
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| Re: 87 Octane in a GT (mrsamwong) | « » 9:46 PM 10/13/2003 |
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quote:
Hi everyone, I'm new to this site and have a question. I just bought my Vibe GT at the end of the summer and I've been putting 87 octane in it. I haven't noticed any knocking or anything yet. How or will the lower octane fuel damage my engine? Sam
Without 92 octane, I do not believe that is possible to hit lift. So you're missing out on one of the best thrills you can have in this car (while driving that is  )
Lava Vibe GT
wheel locks
home made cargo mat
baby seat
15 " Pirelly Winter Carving tires
brass shifter bushing
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saking2002
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Westland MI
Joined 5-8-2003
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| Re: 87 Octane in a GT (mrsamwong) | « » 11:10 PM 10/13/2003 |
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When I got my Gt I look into the owners manual and its says that you have to use 91 or higher or it will damage the engine in the long run
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Roadpig
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Louisville KY
Joined 9-5-2003
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| Re: 87 Octane in a GT (saking2002) | « » 3:01 PM 10/15/2003 |
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Sunoco has 94? I'm gonna check it out tomorrow...so far it's been 93 for me.
2004 Vibe GT, Neptune Two Tone
Graphite Interior, Moon & Tunes
Power Package, 17" Rims, Exhaust Tip Mods
Tinted (50% front window, 35% back & rear)
Cosmo Alpha Omega 3 Child Seat & Booster Seat
Custom Cargo Mat, Debadged
Magnaflow Cat-back Exhaust, Injen CAI 
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coratz
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ont
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| Re: 87 Octane in a GT (Roadpig) | « » 4:25 PM 10/15/2003 |
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for you technojunkies out there..... do you think mrsamwongs pcm will re learn his fuel/air/knock mix right away? seeing that he did this 87 octane thing since his car was new for a few months? maybe a battery disconect after a proper octane fill up???
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mrsamwong
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North York ON
Joined 10-12-2003
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| Re: 87 Octane in a GT (coratz) | « » 4:32 PM 10/15/2003 |
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Hi, thanks for everyone's input. Really appreciate it. And yes, you can hit lift on 87 octane I'll have to look into that ECU issue. Thanks for the thought.Sam
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