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WRONG OCTANE

59-62USNVET

Well-known member
Joined
Jun 27, 2005
Messages
113
Location
Clifton, NJ
Corvette
Had:76,87TT,90TT,03 ZO6, Have 06 ZO6
Went to the local Sunoco to fill up needing about 12 gallons. I handed the attendant my credit guard and said "93 fill it". I looked at the pump after about 6 or 7 gallons and realized he was putting 87 in. I reached out and shut the pump off and started complaining. The boss came over and volunteered to put in a bottle of STP octane boost, gratis. I filled the rest of the car up with about 5 gallons of 93 and the octane boost. The bottle gave no info except that it would boost the octane and recommending its use with 14 gallons. Did I do the right thing? I don't hear any pinging and the book says 91 is OK. I have a bottle of NOS Octane booster that will boost it up 6 octane numbers. It says it will treat 8-16 gallons. Am I doing any harm to the engine by using the booster?I really don't want to drain the tank. Any comments or ideas out there? This really ticked me off. Thanks for any help.
59-62USNVET
 

wishuwerehere82

Well-known member
Joined
Sep 6, 2003
Messages
2,314
Location
Rochester, NY
Corvette
Red '82 Coupe,Sebring Silver '98 Coupe
The 7 gal. of 87 plus the 5 gal. of 93 average to a combined octane of 89.5.
Combine that with what you had left in the tank, and it's probably close to 90.5.
I think the can of STP got you well over 91.
If it starts pinging, add some NOS, but not the whole thing. Maybe 1/4.
But it shouldn't ping. The knock sensor will retard the timing automatically if it does.
 

jhecox

Well-known member
Joined
May 11, 2006
Messages
1,178
Location
Auburn Hills-MI
Corvette
2016 Corvette Racing Yellow, Z51, OURS C7
I think the computer will automatically de-tune the engine to prevent any ping or knock. So there shouldn't be any engine damage for running the lower octane.

Hecox
 

Marlar

Well-known member
Joined
Jan 25, 2005
Messages
146
Location
Winder, GA.
Corvette
1965 Nassau Blue & 2006 VY Z06
Sounds like a very good excuse for a road trip to get rid of that tank of fuel to me!!!:upthumbs :beer
 

catbert

Moderator
Joined
Aug 26, 2004
Messages
3,487
Location
Tobacco Road, NC
I think the computer will automatically de-tune the engine to prevent any ping or knock. So there shouldn't be any engine damage for running the lower octane.

Hecox

:werd: I had to run a whole tank of 87 in the middle of New Mexico, cuz that's all they had. The Vette didn't seem to mind at all - no ping.
 

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