87 octane for C6
Burning Brakes
Joined: Oct 2007
Posts: 1,164
Likes: 0
From: Eagle River Wisconsin
St. Jude Donor '08
Le Mans Master
Joined: Feb 2007
Posts: 8,514
Likes: 235
From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
Leave it but do not do any WOT until you get the right gas. The car is designed to work in an emergency with 87. Treat this as an emergency until you burn it out. Take it easy and no harm will be done.
Pro
Joined: Mar 2008
Posts: 738
Likes: 0
From: Vancouver Island British Columbia
Or, if you can't wait that long, buy a bottle (or two) of octane booster and add it into the tank. Read directions on bottle re amount.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
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
Safety Car
Joined: Sep 2006
Posts: 3,846
Likes: 0
From: Boca Raton Inlet, Atlantic Ocean (Floridas east coast)
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
Absolutely agree with rw and Ft Morgan and others. Treat the car as if you CAN'T do WOT. I'd say tho, don't wait until quarter tank. Get it down to 3/4 tank and fill with highest octane, then do it again when it gets down to 1/2 tank. Finally, let it go as low as you dare and then refill a third time with highest octane.
It happens, don't worry too much about it, but drive the car as said: like your grandmother drove it.
It happens, don't worry too much about it, but drive the car as said: like your grandmother drove it.
Race Director
Joined: Nov 2003
Posts: 16,066
Likes: 4,148
From: Bergen county NJ
The computers will retard timing so no damage would ever occur even with a ton of full throttle runs...
You probably would make 5 or 10 less hp(just guessing the hp difference though) ... and running regular gas is no big deal.
If it were me? I'd run the tank down to 3/4's or half a tank and then just fill up with high test...
Mixing high test and regular is how they make silver grade..
Do that a couple of times and then just continue to add high test...
(remember the computers are so smart these days...regular grade gas just retards the timing.. and makes slightly less hp)
You probably would make 5 or 10 less hp(just guessing the hp difference though) ... and running regular gas is no big deal.
If it were me? I'd run the tank down to 3/4's or half a tank and then just fill up with high test...
Mixing high test and regular is how they make silver grade..
Do that a couple of times and then just continue to add high test...
(remember the computers are so smart these days...regular grade gas just retards the timing.. and makes slightly less hp)
Melting Slicks
Joined: Feb 2004
Posts: 3,131
Likes: 148
From: Sugar Land TX
Assuming you ran your tank down to where you had 12 gallons of 87 left then if you add 4 gallons of 104 you would bring your octane up to 91.25. No holding back then! I believe 104 unleaded is what most race shops carry.
Here's the formula:
87 x 12 = 1044
104 x 4 = 416
1044 + 416/16 = 91.25
Here's the formula:
87 x 12 = 1044
104 x 4 = 416
1044 + 416/16 = 91.25
Race Director
Joined: May 2001
Posts: 15,323
Likes: 2,077
From: Guelph, Ontario
Melting Slicks
Joined: Sep 2003
Posts: 3,172
Likes: 4
From: Central Coast CA
Instructor
Joined: Dec 2007
Posts: 238
Likes: 7
From: Ridgetop Tennessee
5-6 gallons should balance it out.
I knew of a C4 driver that absent mindedly put in a few gallons of diesel. He immediately went and filled it up with racing fuel and had a little smoke but no long term harm.
Last edited by lurtonk; Apr 21, 2008 at 11:09 AM.
