What grade fuel does the Bonneville GXP run on? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-18-2005, 11:12 PM   #11
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Originally Posted by LakevilleSSEi
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Originally Posted by inurok
Actually I thought GM installed knock sensors in the newer Northstars allowing lower octane fuels. Anyway I use 87 as I have noticed no performance increase with 93 octane myslf.
As if they wouldn't?


Anyways....I'd run 93 or better if I could.
If ya could....could afford gas?
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Old 05-18-2005, 11:18 PM   #12
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Originally Posted by BillBost37
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Originally Posted by LakevilleSSEi
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Originally Posted by inurok
Actually I thought GM installed knock sensors in the newer Northstars allowing lower octane fuels. Anyway I use 87 as I have noticed no performance increase with 93 octane myslf.
As if they wouldn't?


Anyways....I'd run 93 or better if I could.
If ya could....could afford gas?
My car'* only seen one tank of 87 since I owned it....and that'* because a friend put gas in it for me and he accidentally put in 87.
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Old 05-20-2005, 06:58 AM   #13
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Originally Posted by LiquidGXP
It says clearly on the tank door in big red letters Premium fuel ONLY.
My Aurora states this also, but the owner'* manual says it can run on 87 (although 91+ is recommended). I generally run 89 or 90 with no problems.
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Old 05-22-2005, 05:26 AM   #14
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I think too many people get caught up in the premium hype. The difference between lower and higher octane fuel is the burn rate. HIgher octane fuel burns slower to keep higher compression engines from detonating or pinging. That'* pretty much all there is to it. If your car doesn't specify that it needs premium you are wasting your money buying it. All my dealer recommends in our GXP is a good quality fuel. I always run Chevron 87. In 18k miles the car'* best tank of fuel is 17.1 mpg. My wife switched to premium thinking it would help improve the fuel economy until I saw the bill. No difference what so ever. On the other hand, if you feel better about life running it and can afford it, by all means fill er up.
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Old 05-22-2005, 07:41 PM   #15
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Originally Posted by Buzz38
I think too many people get caught up in the premium hype. The difference between lower and higher octane fuel is the burn rate. HIgher octane fuel burns slower to keep higher compression engines from detonating or pinging. That'* pretty much all there is to it. If your car doesn't specify that it needs premium you are wasting your money buying it. All my dealer recommends in our GXP is a good quality fuel. I always run Chevron 87. In 18k miles the car'* best tank of fuel is 17.1 mpg. My wife switched to premium thinking it would help improve the fuel economy until I saw the bill. No difference what so ever. On the other hand, if you feel better about life running it and can afford it, by all means fill er up.
To correct you Higher octane fuel does not burn slower than lower octane gasoline. The difference in Octane determines the fuels ignition temperature. For example at a certain temperature a piece of paper will spontaneously ignite. As everyone is aware the more you compress something the higher the temperature will be relative to the amount of compression. The octane rating is directly relative to the temperature that the fuel will spontaneously combust. (The higher the rating the better the resistance to that)

So, if you run a lot of boost or high compression in an engine and put 87 octane in your car the likelyhood that the fuel will ignite before the piston reaches TDC (Top dead Center) is higher if not absolute. We all know what happens if the fuel ignites before the piston reaches TDC lol... BOOM. Sight pre-ignition gives a knock but if the preignition is too severe, well, I hope you have sneakers on cause you'll be walking home.
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Old 05-22-2005, 07:53 PM   #16
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Quote:
Originally Posted by LiquidGXP
Quote:
Originally Posted by Buzz38
I think too many people get caught up in the premium hype. The difference between lower and higher octane fuel is the burn rate. HIgher octane fuel burns slower to keep higher compression engines from detonating or pinging. That'* pretty much all there is to it. If your car doesn't specify that it needs premium you are wasting your money buying it. All my dealer recommends in our GXP is a good quality fuel. I always run Chevron 87. In 18k miles the car'* best tank of fuel is 17.1 mpg. My wife switched to premium thinking it would help improve the fuel economy until I saw the bill. No difference what so ever. On the other hand, if you feel better about life running it and can afford it, by all means fill er up.
To correct you Higher octane fuel does not burn slower than lower octane gasoline. The difference in Octane determines the fuels ignition temperature. For example at a certain temperature a piece of paper will spontaneously ignite. As everyone is aware the more you compress something the higher the temperature will be relative to the amount of compression. The octane rating is directly relative to the temperature that the fuel will spontaneously combust. (The higher the rating the better the resistance to that)

So, if you run a lot of boost or high compression in an engine and put 87 octane in your car the likelyhood that the fuel will ignite before the piston reaches TDC (Top dead Center) is higher if not absolute. We all know what happens if the fuel ignites before the piston reaches TDC lol... BOOM. Sight pre-ignition gives a knock but if the preignition is too severe, well, I hope you have sneakers on cause you'll be walking home.
What good is running higher octane than the manufacturer recommends then?

The only way a new car will grenade and leave you walking is if the knock sensor is broken. Otherwise there'* a bunch of 3.8'* out there that would be down since I am willing to bet a lot of people aren't spending the money for premium fuel. Poor performance I would agree on but blown motors I doubt. I have been caught on the wrong side of this issue before, not this time.
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