octane
12-25-2008, 12:35 AM
#1
octane
Okay, I know the manual says get the best octane you can, but I've always just used regular 87 octane. I've been told that the whole antiknock thing was for older engines, and that today, it's not really much of a problem.
Do people here use just regular fuel, or do you use premium because it really is better for the engine somehow (aside from HP increase)?
Do people here use just regular fuel, or do you use premium because it really is better for the engine somehow (aside from HP increase)?
12-25-2008, 12:39 AM
#2
fuel economy factors in too, i think... and yes the knocking thing has been a problem... but i think the g37 has knock sensors or something... not totally sure though i just pump premium because gas is relatively cheaper than before... and sure there are performance gains... in the long run you don't really save money because you get worse mpg? dunno
12-25-2008, 01:19 AM
#3
Well, I was under the impression that the knocking in the G was due to some funky engine issue, and didn't have anything to do with the oil. Apparently using the Nissan Ester oil solves the knock. But in general, is using fuel of a lesser octane rating actually bad for an engine (fuel economy and HP aside). Like, are there impurities in the crappier gasoline that leaves residue or corrodes your engine?
12-25-2008, 08:56 AM
#5
Oh I wasn't planning to be. I mean, if someone gives me a good reason to use premium fuel, I will. It's just that I've heard from a bunch of people that for the newer engines, higher octane doesn't really affect anything. But thx, you're the first person to suggest otherwise. And yeah with cheap gas prices these days, getting premium is really no big deal.
12-25-2008, 10:28 AM
#6
Oh I wasn't planning to be. I mean, if someone gives me a good reason to use premium fuel, I will. It's just that I've heard from a bunch of people that for the newer engines, higher octane doesn't really affect anything. But thx, you're the first person to suggest otherwise. And yeah with cheap gas prices these days, getting premium is really no big deal.
Yes, you can use regular 87 octane unleaded and it will run on it. But it's not recommended. I wouldn't and don't. Enjoy the fact that premium unleaded is less than half the price of what regular unleaded was less than a year ago (at least here in the States). It will probably be reasonably priced for the next 6 months to a year at least. Use the good stuff.
12-25-2008, 11:05 AM
#7
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Actually, higher octane gasoline burns slower, making less prone to pre-detonation (knock) in higher compression or forced induction engines. Our cars require premium as the compression is higher in our engines.
I am sure that our cars have knock sensors, but the problem is that once they sense knock, they cure the problem by pulling ignition timing (retarding the timing). Pull the timing and it feels like he car falls flat on it's nose.
In my Turbo Regal, when it senses knock, it literally slows down as the ignition timing is pulled.
There are also additive packages added by the refiners that are nice such as detergents. Someone correct me if I am wrong, but the premium gas at the pumps is usually manufactured by the brand of station you are at (Exxon, Shell, etc.), while the regular is usually from the closest manufacturer depot.
Do yourself a favor and put in 91 or better
I am sure that our cars have knock sensors, but the problem is that once they sense knock, they cure the problem by pulling ignition timing (retarding the timing). Pull the timing and it feels like he car falls flat on it's nose.
In my Turbo Regal, when it senses knock, it literally slows down as the ignition timing is pulled.
There are also additive packages added by the refiners that are nice such as detergents. Someone correct me if I am wrong, but the premium gas at the pumps is usually manufactured by the brand of station you are at (Exxon, Shell, etc.), while the regular is usually from the closest manufacturer depot.
Do yourself a favor and put in 91 or better
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12-25-2008, 12:32 PM
#8
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i fill up with 98 octane 
12-26-2008, 08:27 PM
#10
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Are you serious or are you lying your *** off. The highest I get here in Dallas is 93 but back to the topic. Premium fuel is alot better for your engine especially with a 40k car why would you put in cheap gas in the first place. Also, in the long run it gives up better gas mileage.
12-26-2008, 09:20 PM
#11
Are you serious or are you lying your *** off. The highest I get here in Dallas is 93 but back to the topic. Premium fuel is alot better for your engine especially with a 40k car why would you put in cheap gas in the first place. Also, in the long run it gives up better gas mileage.
UAE FTMFW!
BTW, higher octane does NOT give you better mileage, it actually worsens your mileage but not to any appreciable degree.
12-28-2008, 06:03 AM
#13
Administrator
yup it is cheaper than water BB.. $1.83 for a Gallon of 98 Octane and $1.69 for the 95 Octane
