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Old 12-20-2003, 11:27 PM   #11
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I was going to add my Trans Am does not require premium with a 10.25:1 Compression ratio. But Premium is reccomended for best performance.
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Old 12-20-2003, 11:34 PM   #12
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Default Re: Can someone please explain this.........

Quote:
Originally Posted by 94Regal
2003 Bonneville SSEi 0-60 6.8s
2004 Bonneville GXP 0-60 6.8s
Have any test actually been done on production GXP cars or are they just estimating?
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Old 12-21-2003, 12:18 AM   #13
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Northstar engines require premium...I know mine does
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Old 12-21-2003, 12:21 AM   #14
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The Vibe GT requires premium -- it has an 11:1 ratio. It has a knock sensor that will retard the timing if you use regular.

They stress in the manual that it is ok to use regular on a temporary basis, but you should fill up with premium as soon as you can find it.
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Old 12-21-2003, 05:46 AM   #15
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Quote:
Originally Posted by Jstpsntym
Actually, the Northstar engine has much more capacity for performance. There are custom built Caddy engines pushing out 1000 HP in street applications. You cant do that with a 3800 unless you have more money than brains. In either case, the tranny is the limiting factor in what you can accomplish.

As far as the "equal" performance, I can't answer that, I can only assume that the added power came will an increase in weight that cancelled out the short-term benefits. Or, perhaps, the test driver couldn't run the car through its proper paces.


i have seen pic'*
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Old 12-21-2003, 08:41 AM   #16
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I second being able to say ALL northstar powered vehicles REQUIRE premium. They all have knock sensors, and engine will retard.
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Old 12-21-2003, 10:41 AM   #17
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Quote:
Originally Posted by 94Regal
I second being able to say ALL northstar powered vehicles REQUIRE premium. They all have knock sensors, and engine will retard.
So, if I do get a GXP next year, I will still have to buy the high-dollar stuff AND will be getting slightly worse fuel milage? It should be worth it.
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Old 12-21-2003, 10:42 AM   #18
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Stick with your blown 02 SSEi bud
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Old 12-21-2003, 12:25 PM   #19
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Not all Northstars require Premium. My Caddy didn't. I think it varied by model.
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Old 12-21-2003, 02:49 PM   #20
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No GM engine "requires" any fuel to run. its your choice you want knock retard
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