Consequences to Adding Regular Gas? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Dave-ROR · 12-04-2011, 12:58 PM

Quote:

Originally Posted by LSxJunkie

It'll pull enough timing. Most NA cars these days are so good on knock retard that you'd be hard pressed to grenade a motor. Liability issues and all. HOWEVER, the money that you saved by putting regular in the car instead of premium, you lose in fuel economy because the car is going to burn that much less efficiently and you'll be using more throttle to get the same result. It ends up being a wash.

Glad I read the rest of the thread first so I didn't have to type that again

Ikaros · 12-04-2011, 01:08 PM

I think it's just a momentary "win" if you buy regular gas. Sure you save like $0.10 per litre but it also means that it's not going to be very efficient in your engine. Plus as stated above it might be bad for your engine in the long run. I'm sure they wouldn't tell you to buy the more expensive one unless they did some tests, it's not like they gain revenue from gas stations lol

Giccin · 12-04-2011, 01:14 PM

Quote:

Originally Posted by st162celica

If you are NOT going to keep the car for long a time and don't care about the marginal performance decrease, then use 91.

Feel slack for the guy who buys a car that has been filled with 91 when the engine needs a higher octane. I would be very unhappy knowing this if I was to buy it 2nd hand.

Unfortunately, in some States 91 (or I think it was 93) is the highest we can get. If we want the pricy stuff we have to go out of our ways to get it... whether it is at the track.. or 50miles/80km away from us. Other than that it starts going to the mid-high 80s.

Saying that some of us won't keep our cars (might be true for those possibly upgrading down the line or like you said those who completely don't care) is a bold statement for someone who hasn't really put the situations of people in different parts of the world into consideration; however some of us do take care of our cars really well and that's what we're limited too.

Am I calling you out on this? No. I'm giving you a "heads up" on what some of us have what we use to make-do with.

Dark · 12-04-2011, 01:25 PM

Quote:

Originally Posted by Giccin

Unfortunately, in some States 91 (or I think it was 93) is the highest we can get. If we want the pricy stuff we have to go out of our ways to get it... whether it is at the track.. or 50miles/80km away from us. Other than that it starts going to the mid-high 80s.

Saying that some of us won't keep our cars (might be true for those possibly upgrading down the line or like you said those who completely don't care) is a bold statement for someone who hasn't really put the situations of people in different parts of the world into consideration; however some of us do take care of our cars really well and that's what we're limited too.

Am I calling you out on this? No. I'm giving you a "heads up" on what some of us have what we use to make-do with.

the US rating differs from other places around the world. And if one car company want to sell cars in the US, they need to tune the engine to suit the US graded gas, no?

Dave-ROR · 12-04-2011, 01:34 PM

Quote:

Originally Posted by Dark

the US rating differs from other places around the world. And if one car company want to sell cars in the US, they need to tune the engine to suit the US graded gas, no?

Correct. All cars in the US that recommend premium specifically recommend 91 octane.

Want.FR-S · 12-04-2011, 02:02 PM

Quote:

Originally Posted by Dave-ROR

Correct. All cars in the US that recommend premium specifically recommend 91 octane.

If the recommended is the 91 [AKI] premium gas, is there any advantage/disadvantage of adding 93 [AKI] gas?

ryude · 12-04-2011, 02:34 PM

Quote:

Originally Posted by Want.FR-S

If the recommended is the 91 [AKI] premium gas, is there any advantage/disadvantage of adding 93 [AKI] gas?

Not unless you tune for it. I'm sure you could get an extra 5-10 hp out of a 93 tune.

coyote · 12-04-2011, 06:18 PM

Quote:

Originally Posted by LSxJunkie

It'll pull enough timing.

That's another ignorant guess, the kind that is so common on this forum.

Do you know how Subaru knock management works?

coyote · 12-04-2011, 08:20 PM

I take your point on the blow up thing. NA cars can ping for years and years and hold together. Anyone who ever owned a Subaru Brumby knows that.

However, the way the Subaru knock strategy works, there's no guarantee the car can pull enough timing to prevent knock on crap fuel.

What that means with this engine 12.5:1 compression, I don't know. No-one does.

Ak1m0to · 12-04-2011, 08:23 PM

I love it when these threads come up.
Don't buy the car if you are going to skimp out on something as frugal as gas.
I'd rather spend a couple more dollars everytime I go to the pump then to have problems later on.

Ryephile · 12-04-2011, 08:26 PM

Quote:

Originally Posted by coyote

That's another ignorant guess, the kind that is so common on this forum.

Do you know how Subaru knock management works?

The ECU in the car is likely a Toyota, since they're the only ones with D-4S experience. Whatever sub-par knock strategy Subaru may have had in the past likely isnt relevant for your argument.

ahausheer · 12-04-2011, 08:29 PM

Required = Car can't pull enough timing in all situations, but probably could in some (ie gentle driving), damage may result at some point.
Recommended = Engine damage will not result from low grade fuel, enough engine timing can/will be pulled at the expence of Hp and possibly mpg.

Dave-ROR · 12-04-2011, 09:30 PM

Quote:

Originally Posted by ahausheer

These companies spent tens of millions of dollars on this car and they know better than we do. If it was cabable of using low grade fuel for its entire life without any significant degradation then premium fuel would be RECOMMENDED not REQUIRED. Don't think that some guy on some forum that has a lot of racing experience or comes off as being ''car'' knowledgeable knows better than Subaru/Toyota. Believe me, in this economy I'm sure Subaru would love to be able to save to consumer money by allowing low grade fuel. If you are going to spend 25K plus on anything follow the instruction manual. The required fuel was studied by real scientists who actually know stuff.

They do label it as recommended btw... personally I have no intention of doing so. It's pointless, what you save in money you lose in fuel economy, making it completely pointless not to spend the money up front.

brillo · 12-04-2011, 11:05 PM

Your not going to damage the engine running 87 or 89, it will just cut the timing back to compensate and you'll get less HP and likely crappier gas mileage.

Given the car already gets pretty good mileage for the performance, I would just suck it up and pay for the premium fuel.

12-04-2011, 08:23 PM	#24
Ak1m0to G20 Guru Join Date: Nov 2011 Drives: Infiniti G20 / FRS Location: Houston, TX Posts: 71 Thanks: 1 Thanked 4 Times in 4 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I love it when these threads come up. Don't buy the car if you are going to skimp out on something as frugal as gas. I'd rather spend a couple more dollars everytime I go to the pump then to have problems later on. __________________ Slowmatic Drfiterz, from P to D in a heartbeat.

12-04-2011, 08:29 PM	#26
ahausheer Re-member Join Date: Nov 2011 Drives: Toyota camry Location: S. Cali Posts: 1,001 Thanks: 98 Thanked 292 Times in 152 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Required = Car can't pull enough timing in all situations, but probably could in some (ie gentle driving), damage may result at some point. Recommended = Engine damage will not result from low grade fuel, enough engine timing can/will be pulled at the expence of Hp and possibly mpg. __________________ Nothing decays like progress, and nothing preserves like neglect. Last edited by ahausheer; 12-05-2011 at 10:05 PM. Reason: I made an incorrect assumption

12-04-2011, 08:20 PM	#23
coyote Senior Member Join Date: Oct 2011 Drives: Slowly Location: brisbane.qld.au Posts: 1,064 Thanks: 212 Thanked 539 Times in 235 Posts Mentioned: 21 Post(s) Tagged: 1 Thread(s)	I take your point on the blow up thing. NA cars can ping for years and years and hold together. Anyone who ever owned a Subaru Brumby knows that. However, the way the Subaru knock strategy works, there's no guarantee the car can pull enough timing to prevent knock on crap fuel. What that means with this engine 12.5:1 compression, I don't know. No-one does.

12-04-2011, 11:05 PM	#28
brillo Senior Member Join Date: Nov 2011 Drives: 2013 Firestorm FR-S Location: Houston Posts: 506 Thanks: 18 Thanked 77 Times in 64 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Your not going to damage the engine running 87 or 89, it will just cut the timing back to compensate and you'll get less HP and likely crappier gas mileage. Given the car already gets pretty good mileage for the performance, I would just suck it up and pay for the premium fuel.

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