No vtec with mid grade gas
#1
No vtec with mid grade gas
I always put premium in my b16 civic but I have a half tank of mid grade in there now. I want to go and rip it.... Is it really bad to vtec it with that grade gas in it? Never tried it.... is it going to have detonation issues?
#2
Re: No vtec with mid grade gas
According to the Civic Si owners manual, premium (91-93 octane) is recommended but the engine will still run fine on 87 or 89 octane because the ECU can retard timing as necessary. However, it also says to expect loss in performance and loss in gas mileage while using a grade of gasoline other than premium. Since the manual says it is fine, I would assume that the statement includes using being able to use the entire factory-intended powerband without consequence.
Also, unless your tank was nearly dry when you filled up with 89 octane, the gas in your tank is probably slightly more than 89 octane due to the old gas mixing with the new gas.
Also, unless your tank was nearly dry when you filled up with 89 octane, the gas in your tank is probably slightly more than 89 octane due to the old gas mixing with the new gas.
#4
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Location: b00sting my D16s, SoWis, USA
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Re: No vtec with mid grade gas
Mid-grade in Wisconsin is 91, which is what the owner's manual considers Premium. You'll notice some very slight hesitation, or a very slight power loss with the more throttle you give it. You won't run into any issues if you're still running a knock sensor, unless you have 12:1 pistons in there and tons of headwork.
Long story short, it's fine.
Long story short, it's fine.
#5
#7
318 Curves, 11 miles
Re: No vtec with mid grade gas
I run 89 in mine all the time and notice no performance or mileage difference between 89 and 91.
It's not going to hurt it if you have a knock sensor. B16s don't run *that* high of compression stock.
It's not going to hurt it if you have a knock sensor. B16s don't run *that* high of compression stock.
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