octane
05-26-2009, 12:36 PM
#17
So I just got the G and had a question on octane. I know the owners manual says 91 or higher is recommended....
Does this car sense the type of gas you are in and slightly change its tuning to accomodate? I looked up all the gas stations to see if anyone sold 91 or 92 but they all sell 93 in my area.
I dont plan on putting 87 or 89 in the car, but I was just curious if this car 'tweaks itself once it recognizes you are putting in 93 instead of 91. I would gander that you could probably get a 5 whp increase due to tuning it for 93 instead of 91 so I was curious if the car can recognize this.
Does this car sense the type of gas you are in and slightly change its tuning to accomodate? I looked up all the gas stations to see if anyone sold 91 or 92 but they all sell 93 in my area.
I dont plan on putting 87 or 89 in the car, but I was just curious if this car 'tweaks itself once it recognizes you are putting in 93 instead of 91. I would gander that you could probably get a 5 whp increase due to tuning it for 93 instead of 91 so I was curious if the car can recognize this.
05-29-2009, 04:56 PM
#18
So I just got the G and had a question on octane. I know the owners manual says 91 or higher is recommended....
Does this car sense the type of gas you are in and slightly change its tuning to accomodate? I looked up all the gas stations to see if anyone sold 91 or 92 but they all sell 93 in my area.
I dont plan on putting 87 or 89 in the car, but I was just curious if this car 'tweaks itself once it recognizes you are putting in 93 instead of 91. I would gander that you could probably get a 5 whp increase due to tuning it for 93 instead of 91 so I was curious if the car can recognize this.
Does this car sense the type of gas you are in and slightly change its tuning to accomodate? I looked up all the gas stations to see if anyone sold 91 or 92 but they all sell 93 in my area.
I dont plan on putting 87 or 89 in the car, but I was just curious if this car 'tweaks itself once it recognizes you are putting in 93 instead of 91. I would gander that you could probably get a 5 whp increase due to tuning it for 93 instead of 91 so I was curious if the car can recognize this.
05-30-2009, 10:21 AM
#19
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Just to clarify the last point, the car does not detect the type of gas directly, but rather the performance of the engine based on detonation (and pre-detonation as previously mentioned) to adjust timing and other engine performance parameters to keep it running properly. But don't interpret that as the computer compensation for using cheap regular gas as a reason to use it since performance will still be affected and hard acceleration can still cause pinging or other issues that the ECU cannot compensate quick enough for, hence the warning in the owners manual.
Another clearer reason to use premium fuel is the design of our injectors. Our injectors are designed with 12 nozzle holes vs. the standard 4 nozzle design, and the nozzle holes are almost 1/2 the size. Premium top tier fuels like Shell are formulated to run cleaner and prevent deposits. Regular fuel will like result in deposits and clogging of these injector nozzles.
See here (6M file): http://www.nissan-global.com/EN/DOCU...02_X-1a-05.pdf
The are just too many reasons not to use regular gas on this premium engine.
Another clearer reason to use premium fuel is the design of our injectors. Our injectors are designed with 12 nozzle holes vs. the standard 4 nozzle design, and the nozzle holes are almost 1/2 the size. Premium top tier fuels like Shell are formulated to run cleaner and prevent deposits. Regular fuel will like result in deposits and clogging of these injector nozzles.
See here (6M file): http://www.nissan-global.com/EN/DOCU...02_X-1a-05.pdf
The are just too many reasons not to use regular gas on this premium engine.
05-30-2009, 03:35 PM
#20
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Choices
Interesting to read that the Hyundai Genesis Coupe will allow either - Premiumor or Regular. In the Hyundai, that's true for both the V6 and 4 cyl. The manufacturers specifically designed the engines to allow both, with a difference in HP resulting (from Wikipedia):
- 3.8 V6
- 312 hp (233 kW) (Premium Fuel) / 306-hp (regular)
- 263 lb·ft (357 N·m) @ 4,700 rpm (regular and premium fuel)
- 0-60 mph in less than 6 seconds[15][16]
- 'Top speed of 149 mph (240 km/h) (Govt.)
- 2.0T
- 223 hp (166 kW) (Premium Fuel) / 210-hp (regular)
- 223 lb·ft (302 N·m) @ 2,000 rpm (regular and premium fuel)
- 0-60 mph in less than 7 seconds[17]
- Top speed of 137 mph (220 km/h) (Govt.)[16][18][19]
05-30-2009, 03:46 PM
#21
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91+ Octane Required, not just Recommended!
Came across this in my manual:
decrease in performance.
So, I take from this that, unlike some other engines in which you have a choice, Infiniti is basically saying, only use Regular when you have no choice, and get Premium as fast as you can into the engine!
VQ37VHR engine
Use unleaded premium gasoline with an octane
rating of at least 91 AKI (Anti-Knock Index)
number (Research octane number 96).
If premium gasoline is not available, unleaded
regular gasoline with an octane rating of 87 AKI
number (Research octane number 91) may be
temporarily used, but only under the following
precautions:
rating of at least 91 AKI (Anti-Knock Index)
number (Research octane number 96).
If premium gasoline is not available, unleaded
regular gasoline with an octane rating of 87 AKI
number (Research octane number 91) may be
temporarily used, but only under the following
precautions:
c
Have the fuel tank filled only partially with
unleaded regular gasoline, and fill up with
unleaded premium gasoline as soon as possible.
unleaded regular gasoline, and fill up with
unleaded premium gasoline as soon as possible.
c
Avoid full throttle driving and abrupt acceleration.
The situation is different for the G35, in which it was simply an option:
If unleaded premium gasoline is not available,
you may use unleaded regular gasoline with an
octane rating of at least 87 AKI number (Research
octane number 91), but you may notice a
The situation is different for the G35, in which it was simply an option:
If unleaded premium gasoline is not available,
you may use unleaded regular gasoline with an
octane rating of at least 87 AKI number (Research
octane number 91), but you may notice a
decrease in performance.
So, I take from this that, unlike some other engines in which you have a choice, Infiniti is basically saying, only use Regular when you have no choice, and get Premium as fast as you can into the engine!
06-17-2009, 12:35 PM
#22
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98 octane??? I come from Europe and there is no such thing as regular sale of 98 octane gasoline.... It is a different measure. 98 in EU = 93 in US
From Wiki:
This higher rating seen in Europe is an artifact of a different underlying measuring procedure. In most countries (including all of Europe and Australia) the "headline" octane that would be shown on the pump is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, this means that the octane in the United States will be about 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, would be 91-92 in Europe. However most European pumps deliver 95 (RON) as "regular", equivalent to 90–91 US (R+M)/2, and deliver 98 (RON), 99 or 100 (RON) labeled as Super Unleaded.
In the United Kingdom, 'regular' petrol has an octane rating of 95 RON, with 97 RON fuel being widely available as the Super Unleaded. Tesco and Shell both offer 99 RON fuel. BP is currently trialling the public selling of the super-high octane petrol BP Ultimate Unleaded 102, which as the name suggests, has an octane rating of 102 RON. Although BP Ultimate Unleaded (with an octane rating of 97 RON) and BP Ultimate Diesel are both widely available throughout the UK, BP Ultimate Unleaded 102 is (as of October 2007) only available throughout the UK in 10 filling stations, and is priced at about two and half times more than their 97 RON fuel.
From Wiki:
This higher rating seen in Europe is an artifact of a different underlying measuring procedure. In most countries (including all of Europe and Australia) the "headline" octane that would be shown on the pump is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, this means that the octane in the United States will be about 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, would be 91-92 in Europe. However most European pumps deliver 95 (RON) as "regular", equivalent to 90–91 US (R+M)/2, and deliver 98 (RON), 99 or 100 (RON) labeled as Super Unleaded.
In the United Kingdom, 'regular' petrol has an octane rating of 95 RON, with 97 RON fuel being widely available as the Super Unleaded. Tesco and Shell both offer 99 RON fuel. BP is currently trialling the public selling of the super-high octane petrol BP Ultimate Unleaded 102, which as the name suggests, has an octane rating of 102 RON. Although BP Ultimate Unleaded (with an octane rating of 97 RON) and BP Ultimate Diesel are both widely available throughout the UK, BP Ultimate Unleaded 102 is (as of October 2007) only available throughout the UK in 10 filling stations, and is priced at about two and half times more than their 97 RON fuel.
06-17-2009, 02:51 PM
#23
98 octane??? I come from Europe and there is no such thing as regular sale of 98 octane gasoline.... It is a different measure. 98 in EU = 93 in US
From Wiki:
This higher rating seen in Europe is an artifact of a different underlying measuring procedure. In most countries (including all of Europe and Australia) the "headline" octane that would be shown on the pump is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, this means that the octane in the United States will be about 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, would be 91-92 in Europe. However most European pumps deliver 95 (RON) as "regular", equivalent to 90–91 US (R+M)/2, and deliver 98 (RON), 99 or 100 (RON) labeled as Super Unleaded.
In the United Kingdom, 'regular' petrol has an octane rating of 95 RON, with 97 RON fuel being widely available as the Super Unleaded. Tesco and Shell both offer 99 RON fuel. BP is currently trialling the public selling of the super-high octane petrol BP Ultimate Unleaded 102, which as the name suggests, has an octane rating of 102 RON. Although BP Ultimate Unleaded (with an octane rating of 97 RON) and BP Ultimate Diesel are both widely available throughout the UK, BP Ultimate Unleaded 102 is (as of October 2007) only available throughout the UK in 10 filling stations, and is priced at about two and half times more than their 97 RON fuel.
From Wiki:
This higher rating seen in Europe is an artifact of a different underlying measuring procedure. In most countries (including all of Europe and Australia) the "headline" octane that would be shown on the pump is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, this means that the octane in the United States will be about 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, would be 91-92 in Europe. However most European pumps deliver 95 (RON) as "regular", equivalent to 90–91 US (R+M)/2, and deliver 98 (RON), 99 or 100 (RON) labeled as Super Unleaded.
In the United Kingdom, 'regular' petrol has an octane rating of 95 RON, with 97 RON fuel being widely available as the Super Unleaded. Tesco and Shell both offer 99 RON fuel. BP is currently trialling the public selling of the super-high octane petrol BP Ultimate Unleaded 102, which as the name suggests, has an octane rating of 102 RON. Although BP Ultimate Unleaded (with an octane rating of 97 RON) and BP Ultimate Diesel are both widely available throughout the UK, BP Ultimate Unleaded 102 is (as of October 2007) only available throughout the UK in 10 filling stations, and is priced at about two and half times more than their 97 RON fuel.
06-17-2009, 03:45 PM
#24
yes the car will automatically adjust depending on the type of gas your running. can you run 87 if thats all there is sure? it wont hurt your car using it a couple times. you could even run just 87 and it wont hurt your car. but you will get far less performance, lower gas mileage, more dirt/soot on the rear bumper from exhaust blowing out the dirtier fumes.
Depending on what it does, there could be a ~5 whp difference between using 93 vs 91.
06-17-2009, 05:19 PM
#27
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Dubai uses metric units I believe and the measure of octane is the same as in EU. 100% sure that 98 octane = 93US
And YEAH, some people should stop cry about the gas prices. In the US and Canada we get the gas sooo cheap relative to the average income...
I just went to Germany it is $6 a gallon. Just put the premium and go.
And YEAH, some people should stop cry about the gas prices. In the US and Canada we get the gas sooo cheap relative to the average income...
I just went to Germany it is $6 a gallon. Just put the premium and go.
06-17-2009, 09:34 PM
#29
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?
BTW, the best Octane is XM 48!
