91 Octane fuel + mufflers
Thread Starter
Advanced
Joined: May 2004
Posts: 62
Likes: 0
From: Boise Idaho
91 Octane fuel + mufflers
In Idaho, 91 octane is the max for fuel. Question is with only 91 octane how
much of the 400 hp. will be lost?
A follow up question: I know very little about fuel injection. If you change out
the stock mufflers, are any changes to the F.I. necessary?
much of the 400 hp. will be lost?
A follow up question: I know very little about fuel injection. If you change out
the stock mufflers, are any changes to the F.I. necessary?
☠☣☢ Semper Ebrius ☢☣☠
Joined: Jun 2001
Posts: 83,301
Likes: 4
From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Re: 91 Octane fuel + mufflers (TabascoC6)
In Idaho, 91 octane is the max for fuel. Question is with only 91 octane how
much of the 400 hp. will be lost?
much of the 400 hp. will be lost?
Racer
Joined: Mar 2004
Posts: 291
Likes: 0
From: Pulaski TN
Re: 91 Octane fuel + mufflers (TabascoC6)
with new muffers you don't have to do a thing to fuel injection. Here, every thing the average car guy needs to know about FI. http://auto.howstuffworks.com/fuel-injection.htm
By the way, Be sure to notice that there are several pages.
[Modified by SSRogers, 5:57 PM 6/25/2004]
By the way, Be sure to notice that there are several pages.
[Modified by SSRogers, 5:57 PM 6/25/2004]
Team Owner
Joined: Feb 2000
Posts: 45,281
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
Re: 91 Octane fuel + mufflers (TabascoC6)
Octane requirements decrease with altitude. What's the elevation there? Ususally, they sell high enough octane for a given elevation to support any "stock" vehicle.
Race Director
Joined: Jun 2001
Posts: 10,084
Likes: 3,055
From: CA
Re: 91 Octane fuel + mufflers (need-for-speed)
Octane requirements decrease with altitude. What's the elevation there? Ususally, they sell high enough octane for a given elevation to support any "stock" vehicle.
Michael
Race Director
Joined: Jan 2001
Posts: 11,183
Likes: 85
From: Castle Rock CO
St. Jude Donor '15
Re: 91 Octane fuel + mufflers (need-for-speed)
Octane requirement for given engine is VERY loosely based on elevation. It is a function of cylinder pressure, affected by altitude, but it is also affected by chamber design, piston top design, compression ratio, and in general, cylinder pressure. Octane levels change little across the country due to supercharged and turbo vehicles maintaining cylinder pressures even at higher altitudes.
It will be very hard to make a statement about the LS2 and octane until after it is out and several people start testing it. The LS6 is sensitive to octane, though, and it would be a good prediction that the LS2 will maintain that sensitivity(chamber design appears to be LS6 at this time).
Todd
It will be very hard to make a statement about the LS2 and octane until after it is out and several people start testing it. The LS6 is sensitive to octane, though, and it would be a good prediction that the LS2 will maintain that sensitivity(chamber design appears to be LS6 at this time).
Todd
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
Race Director
Joined: Jan 2001
Posts: 11,183
Likes: 85
From: Castle Rock CO
St. Jude Donor '15
Re: 91 Octane fuel + mufflers (LongTimer)
Most of the octane boosters claim to be cat safe, but most of them do not raise the octane rating of fuel more than 2 to 3 points. It may be just enough in some cases, but I don't think the cost over the long run justifies them.
Todd
Todd
Pro
Joined: Apr 2004
Posts: 733
Likes: 0
From: Rapid City SD
Re: 91 Octane fuel + mufflers (Michael A)
Octane requirements decrease with altitude. What's the elevation there? Ususally, they sell high enough octane for a given elevation to support any "stock" vehicle.
Except in kooky California, where 91 is all we have down to 282 feet below sea level (Death Valley).
Michael
Except in kooky California, where 91 is all we have down to 282 feet below sea level (Death Valley).
Michael
Instructor
Joined: Jun 2004
Posts: 189
Likes: 0
From: Las Vegas NV
Re: 91 Octane fuel + mufflers (Yibbutkeen)
Try Union 76. Some of them sell 104 unleaded racing fuel - about $5/gallon, but 1-2 gallons in a tank really woke my zr1 up. I don't buy the altitude thing - regular in SD is 85 octane, premium is 91 and the zr1 pinged like crazy on 91 here too.
Las Vegas not only has 91 octane premium, but we are in the high desert.
Team Owner
Joined: Feb 2000
Posts: 45,281
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
Originally Posted by Yibbutkeen
Try Union 76. Some of them sell 104 unleaded racing fuel - about $5/gallon, but 1-2 gallons in a tank really woke my zr1 up. I don't buy the altitude thing - regular in SD is 85 octane, premium is 91 and the zr1 pinged like crazy on 91 here too.
Last edited by need-for-speed; Jul 8, 2004 at 10:35 PM.
