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04-20-2017, 12:02 PM | #1 |
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E92 Octane Rating
Hey whats up guys. Normally I put in 91 octane (Chevron) but recently, I've ran a bit short so opted for 87. Is this detrimental to the motor at all?
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04-20-2017, 12:04 PM | #2 |
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I'd keep an bottle (or two) of octane booster in your trunk. Just in case you run into this again.
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04-20-2017, 12:17 PM | #3 |
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Any brand you'd recommend? I'm looking between VP Racing and Gold Eagle
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04-20-2017, 12:17 PM | #4 | |
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^ This. Definitely get some booster in.
I'm pretty sure the gas cap says min. rating of 91. What happens if you put a lower octane than your car requires? Quote:
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04-20-2017, 01:04 PM | #6 |
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Hm ok. This may be a dumb question, but what is engine knock?
I usually cruise around in my car on the highway and rarely punch it until I get my pockets back up next week. |
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04-20-2017, 01:27 PM | #7 |
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Engine knock (otherwise known as dieseling) is premature detonation of the charge in the cylinder. Insufficient octane can cause this as the high compression and high combustion chamber temperatures can ignite the fuel before the intended ignition occurs. This can damage pistons and connecting rods (or more) and can cause valve (and other) damage if valves which are supposed to be shut during the power stroke are open.
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04-20-2017, 01:35 PM | #9 |
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If it's a consistent measure then, yes, perhaps. Not half a bottle mixed with half or quarter tank of 87.
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04-20-2017, 01:36 PM | #10 |
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Is the tank full? If not, go get as much 93/94 as you can fit in there lol.
Do not use octane booster. Either way you'll be okay, the engine management is smart enough to adjust timing for 87. Just don't drive it hard.
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04-20-2017, 01:37 PM | #11 |
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The best way would be to syphon out most of the gas in your tank and fill up with premium fuel. Barring that, the risk of damage is lowered by not straining the engine, but I would also recommend topping off the tank every day or 2 with the highest octane gas you can find over the next week or so (depending upon how much you drive) to up the overall octane level of the gas in your tank.
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04-20-2017, 01:47 PM | #12 |
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Isn't buying bottles of booster going to cost you more than the difference in buying 91 vs 87 octane fuel?
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Last edited by M43S7RO; 04-20-2017 at 02:07 PM.. |
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04-20-2017, 01:48 PM | #13 |
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Thread of the year nominee.
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04-20-2017, 02:20 PM | #15 |
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Haha I can I just figured I'd be ok with 2 tanks of 87 for a week. I think 91 is the highest around me. I'm at half right now. I'll fill up some 91 after work, Valero offers a discount with cash
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04-20-2017, 02:39 PM | #16 |
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For some reason every time I read your username it registers at "ButtSlut69". Is this intentional?
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04-20-2017, 02:48 PM | #17 | |
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You cannot afford 91 versus 87? If so, I hate threads like that. You are driving the performance benchmark between the years of 08-13.....if you cannot afford a dollar more per gallon than you should not have the car. If a bitshort means something else, I retract that statement. |
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04-20-2017, 02:52 PM | #19 |
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04-20-2017, 04:25 PM | #20 |
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04-20-2017, 04:32 PM | #21 | |
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But point taken regarding octane rating. The guy at the dealership told me it was chill for a little bit but not to make it a habit. Out of curiosity, is there a limit for octane ratings for the S65 when filling it with 100+ race gas? |
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04-20-2017, 05:17 PM | #22 |
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