Gas?
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
My 1989 says to use 91 but I can't find it around here so I mix 89 and 93 in equal parts. Kind of a PITA but the car likes it fine even in this heat. BTW fill out your profile and you will get more answers. Need to know what you have, be specific.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Originally Posted by CentralCoaster
High octane = 91+ If your choices are between 89 and 93, you should go with the 93 on your car.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Drifting
Joined: May 2001
Posts: 1,295
Likes: 2
From: Surprise Arizona
These cars have a knock sensor. If you run a lower octane than 91 you most likely will not hear anything. The sensor will pull out timing till the knock stops. Problem with that is you will loose power and efficiency. If you use premium fuel, 91 or 93 it should be okay.
Le Mans Master
Joined: May 2005
Posts: 7,342
Likes: 2,272
From: Central Maryland
Originally Posted by ol school
I tried less octane gas it seemed to run okay,but I got better milage
out of the higher octane gas.. Its only a couple of dollars differance in pricing.Best to go Better.
out of the higher octane gas.. Its only a couple of dollars differance in pricing.Best to go Better.
As Paul G said, the ECM will retard the timing to prevent detonation if the knock sensors detect any trace of knock. This will save your engine from detonation-related damage, but will have detrimental effects upon the performance. It's not worth it. Let the engine run with the spark advance curve it was designed to use -- this requires the recommended fuel. Your engine will be happy, and so will you.
Be well,
SJW
