Premium vs. Regular - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-24-2005, 11:20 PM   #11
Junior Member
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Custom88 is on a distinguished road
Default

Quote:
Originally Posted by gm4life
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..
Custom88 is offline   Reply With Quote
Old 08-25-2005, 12:15 AM   #12
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

Quote:
Originally Posted by Custom88
Quote:
Originally Posted by gm4life
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.
LakevilleSSEi is offline   Reply With Quote
Old 08-25-2005, 12:16 AM   #13
Member
Posts like a V-Tak
 
Join Date: Sep 2004
Location: Northern Ca.
Posts: 96
Thanks: 0
Thanked 0 Times in 0 Posts
Buzz38 is on a distinguished road
Default

I would like to see someone'* 1/4 mile times on regular and Premium. Even better would be dyno slips. If it'* not knocking then premium is useless.
Buzz38 is offline   Reply With Quote
Old 08-25-2005, 12:22 AM   #14
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

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)
LakevilleSSEi is offline   Reply With Quote
Old 08-25-2005, 12:49 AM   #15
Senior Member
Posts like a Turbo
 
Join Date: May 2005
Location: West Chester, PA
Posts: 351
Thanks: 0
Thanked 0 Times in 0 Posts
auroradude is on a distinguished road
Default

My high compression Premium V8 takes 91 octane. Noticed a difference in power. $3.00 a gallon though, but do I care? No.
auroradude is offline   Reply With Quote
Old 08-25-2005, 12:58 AM   #16
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

Higher octane fuel requires more energy to ignite, but realeases less per unit mass. That'* why engines not tuned for it run worse vs. regular.
J Wikoff is offline   Reply With Quote
Old 08-25-2005, 01:00 AM   #17
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

Quote:
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
LakevilleSSEi is offline   Reply With Quote
Old 08-25-2005, 01:19 AM   #18
Senior Member Emeritus
Posts like a Camaro
 
Join Date: Feb 2005
Location: Grand Rapids, Iraq
Posts: 1,129
Thanks: 0
Thanked 0 Times in 0 Posts
Chad V is on a distinguished road
Default

I notice a difference between regular and premium. If I step on it with regular, it seems to dog down the engine and I have a problem getting about 26 mpg on the highway. With 91-93 octane, I can manage 30 to 32 on the highway based on the miles I put on everyday[105 miles]
Chad V is offline   Reply With Quote
Old 08-25-2005, 01:23 AM   #19
Junior Member
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Custom88 is on a distinguished road
Default

Quote:
Originally Posted by LakevilleSSEi
Quote:
Originally Posted by Custom88
Quote:
Originally Posted by gm4life
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.
Custom88 is offline   Reply With Quote
Old 08-25-2005, 01:27 AM   #20
Senior Member
Posts like a Turbo
 
Join Date: May 2005
Location: West Chester, PA
Posts: 351
Thanks: 0
Thanked 0 Times in 0 Posts
auroradude is on a distinguished road
Default

Quote:
Originally Posted by LakevilleSSEi
Quote:
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.
auroradude is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Regular vs Premium gas commentary GunsOfNavarone Lounge 5 02-15-2011 11:29 PM
premium vs. regular pump gas MonzaSpyder 1992-1999 15 11-24-2005 10:21 PM
Damn, this is good for just regular members!!! ssesc93 Lounge 3 02-23-2004 09:42 PM
Regular Blubs vs SilverStars (56k Warning) Merlin 91/97 Everything Electrical & Electronic 2 01-01-2004 04:42 AM
regular, mid-grade or premium ? suprrbonne General GM Chat 41 07-16-2003 05:07 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:53 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.