Premium vs. Regular - Page 3 - 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 08-25-2005, 01:30 AM   #21
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Originally Posted by auroradude
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Originally Posted by LakevilleSSEi
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Originally Posted by auroradude
My high compression Premium V8 takes 91 octane. Noticed a difference in power. $3.00 a gallon though, but do I care? No.
I highly doubt that you notice a difference.

I don't notice a difference between 87 and 93 in my medium mod'd SSEi.....

That'* for clearing that up wikoff
You probably take off with an egg under the accelerator. I, on the other hand have a tendency to hammer the gas from a start, where the high octane is needed most.
Nahh...you can ask anyone that'* seen me drive (like half the club lol) I run probably just as hard as you if not harder......I'm not an old **** like you think we all are.
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Old 08-25-2005, 01:37 AM   #22
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I never would put 91 in a GXP why? I mean they say it runs on regular! 91 or higher may be recommended but I know in 2001 they changed the timing so they could run 87! And they can't say you didn't put 91 in it no warrenty left!
well, you would put premium in a GXP unless you WANT it to be doggy and slow. You don't spend all that extra money for a northstar engine over an N/A 3800 and not want to get the best performance and efficiency out of it as possible..
Or unless you want it to be doggy.....Some vehicles are actually SLOWER with the higher octane because the compression isn't there to utilize the higher octane principles.
yes. however, the 4.6 is not one of these engines. With the premium fuel the PCM is able to advance timing to increase performance. With the regular octane the timing has to be retarded to prevent engine knock. My engine isn't a 4.6 but it'* still a decendant from a northstar and the owner'* manual says 87 octane is fine to run, but 89 or higher is recommended for best performance.

IIRC the northstar engines have a higher compression ratio than the supercharged 3800 yet the supercharged 3800 does need premium. Are you saying that the 3800 also does not need premium fuel? If you are, we've ran 87 in our 00 SSEi and it'* a dog with it. Fill it back up with 93 octane and it drives like an entirely different vehicle. Octane does matter.
If anything I think my car ran better with the 87 in it....but it'* only happened once since I had the car....and I had my current mods done then too.
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Old 08-25-2005, 01:43 AM   #23
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Quote:
Originally Posted by auroradude
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Originally Posted by LakevilleSSEi
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Originally Posted by auroradude
My high compression Premium V8 takes 91 octane. Noticed a difference in power. $3.00 a gallon though, but do I care? No.
I highly doubt that you notice a difference.

I don't notice a difference between 87 and 93 in my medium mod'd SSEi.....

That'* for clearing that up wikoff
You probably take off with an egg under the accelerator. I, on the other hand have a tendency to hammer the gas from a start, where the high octane is needed most.
Haha yah, hammer the gas of the get go, you would need to in that Aurora. Heavy cars
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Old 08-25-2005, 01:47 AM   #24
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Yes you do....the fact that I can even squeal tires is wonderful.

I did a few burnouts in my driveway today though. Put some water on the ground, lit em up on a cold start. Went to 6200rpm while spinning. WOOT.
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Old 08-25-2005, 01:49 AM   #25
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I truly feel sorry for your car.
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Old 08-25-2005, 01:52 AM   #26
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I truly feel sorry for your car.
yes. I've been saying that forever, too. lol.

luckily there'* a 400lb difference between the 95-99 V8 Aurora and the 01+ V6 Aurora. It feels much lighter. In fact, our 00 Bonnevilles feel much heavier when you're driving them. The aurora feels nimble in comparison.
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Old 08-25-2005, 02:03 AM   #27
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Blah i am looking at a Camaro Z28 droptop and several T/As...when i get 1 of them can smoke a lot of ppl here hehe.
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Old 08-25-2005, 02:25 AM   #28
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Blah i am looking at a Camaro Z28 droptop and several T/As...when i get 1 of them can smoke a lot of ppl here hehe.
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Old 08-25-2005, 09:01 AM   #29
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Blah i am looking at a Camaro Z28 droptop and several T/As...when i get 1 of them can smoke a lot of ppl here hehe.

Nah we'll still beat you....By the sounds of how you drive on a daily basis.......You'll have that car wrapped around a tree in no time.
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Old 08-25-2005, 10:47 AM   #30
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Quote:
Originally Posted by LakevilleSSEi
It'* not knock that causes anything with the higher octane running slower, it'* the fact that the higher octane itself burns slower (if I remember correctly)
Knock is the reason for running higher octane fuel. No knock = no need for higher octane. When the knock sensor sees knock ( I use the term knock to cover Pre-ignition and detonation) the PCM pulls timing to save the motor. If it sees no knock the PCM advances timing to set parameters which gives you more power. I saw no difference in power or economy in the two tanks of premium fuel we ran and our car hit 140 once on low grade so a dog it wasn't.
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