Northstar Modifications for 2004 - 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 08-08-2005, 07:53 PM   #1
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I found this aticle about the changes made on the Northstar '04

http://media.gm.com/cadillac/00cad/d.../northstar.htm
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Old 08-08-2005, 10:20 PM   #2
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interesting
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Old 08-08-2005, 10:21 PM   #3
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So they lowered compression to accomodate regular fuel. I can see that being a plus for sales.
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Old 08-09-2005, 12:50 PM   #4
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Additional information from a GM-WEB page


http://www.gm.com/automotive/gmpower...star/index.htm
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Old 08-10-2005, 12:39 PM   #5
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They did the regular fuel in 2002 in the Devilles!
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Old 08-10-2005, 12:59 PM   #6
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they can run on regular fuel but not optimally. The GXP performs pretty badly with regular. With premium it drives quite a bit better. My shortstar also only 'requires' 87 but it performs quite a bit better with 89+I'm curious if that'* why the GXP drives so bad in comparisons between it and the SSEi. If dealers are only putting in the 87 octane because that'* all they 'require' that'd make a big difference on your driving impression..
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Old 08-13-2005, 09:12 PM   #7
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I know a few guys with Northstars in Caddys they claim the 91 barly made a difference!
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Old 08-13-2005, 09:49 PM   #8
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Thats good news!
Do you think the 0-60 6.8sec changes a bit using premium fuel + filter ?

maybe the 6.8sec are using regular fuel
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