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Hyundai Genesis Forum: 87 vs 91 octane
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  #1  
Old 03-19-2012, 01:38 AM
deepcolor deepcolor is offline
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Default 87 vs 91 octane

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ok, w/ gas prices soaring (4.29 for regular where i live and 4.50 for premium) at the pump and no end to these high prices in the near future, what are you guys using?

i have always used premium (91 octane) but now i'm considering 87.
just wondering if you will feel a difference in the accelleration and power.

i had a little better than a half of tank of premium and accidently topped it off (7.5 gallons) w/ regualr 87 octane. i thought i noticed a difference in acelleration and power w/ a slight pause / hessitation when trying to accellerate, but that could be psychological i guess.
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Old 03-19-2012, 04:06 AM
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Default Re: 87 vs 91 octane

You are saving $4.00 in a tankfull, does it really matter? Maybe if you fill up every other day
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Old 03-19-2012, 07:57 AM
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Default Re: 87 vs 91 octane

Quote:
Originally Posted by frankv64 View Post
You are saving $4.00 in a tankfull, does it really matter? Maybe if you fill up every other day
What he said ^
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Old 03-19-2012, 09:11 AM
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Default Re: 87 vs 91 octane

I don't understand those that buy 30k and up cars having a problem with high gas prices. If gas seems expensive at 3 for or even 7 dollars a gallon and you are driving a new $30,000 then maybe a small used economy 40mpg car was more in order.(saves on tax, insurance and tires too)
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Old 03-19-2012, 09:18 AM
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Default Re: 87 vs 91 octane

Interesting. One sincere, honest, question and three putdown answers.

Deep Color, why not try a couple of tanksfull of 87, or 89, and see for yourself?
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Old 03-19-2012, 09:59 AM
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Default Re: 87 vs 91 octane

Run both and see if you can tell a difference. I couldn't tell the difference, so I just use 87. However, I can tell the difference on cold start up using Mobil 1 0W-20 advanced fuel economy.
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Old 03-19-2012, 01:11 PM
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Default Re: 87 vs 91 octane

High compression engines make a lot of power because they're high compression engines, not because they burn high octane fuel. They need high octane fuel to prevent pinging (or knocking). With modern ECU's and oxygen sensors, flow meters on air and gas, ping detectors, etc. controlling the fuel air mixture and cam and ignition timing, you're really stretching it to say you're going to outguess the factory engineers that set up the entire package. Put in what the owners manual says to. Simple as that. This question is like the one surrounding using nitrogen to fill the tires, but that's another thread.

What does Hyundai say to feed the 4.6?
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Old 03-19-2012, 01:40 PM
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Default Re: 87 vs 91 octane

Quote:
Originally Posted by fazerG8R View Post
What does Hyundai say to feed the 4.6?
87 Octane

or

91 or higher octane for another 7 HP.
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Old 03-19-2012, 03:36 PM
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Default Re: 87 vs 91 octane

I'd love to see the dynomometer curves for the 4.8 on both fuels. The ping sensor seems to allow a more aggressive timing wih the high octane fuel, allowing a higher power output. I wonder if the higher output is only available at full throttle, or if there's a progressive input. Which fuel is used is going to be determined by the guy driving, and what they feel is giving them the "best" performance for the $$'s.

I guess that I'd go for the 87 if I lived in Florida and did a lot of steady state interstate crusing, and use the 91 if I lived in the mountains and really needed a lot of full throttle response.

Good topic.
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Old 03-19-2012, 05:30 PM
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Default Re: 87 vs 91 octane

Running premium fuel will allow the engine to run with a little more advance and provide 3-6% better mpg. That pretty well wipes out the higher price.

While the engine may run OK with regular fuel, it will be running with some detonation (it takes some detonation for the knock sensors to kick in and retard the timing). Detonation is like smoking cigarettes----------you may be fine for a while, but the damage usually catches up with you.

Bottom line, the cost difference (if any) vs the possible internal problems makes it stupid to run 87 octane fuel. This from an engineer that has been an SAE member and engine nut for over 45 years.
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Old 03-19-2012, 06:09 PM
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Default Re: 87 vs 91 octane

Just run the 87 for three months and make an assessment for yourself. It won't hurt your car in the least.
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Old 03-19-2012, 11:41 PM
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Default Re: 87 vs 91 octane

Quote:
Originally Posted by Jimmmmbo! View Post
Just run the 87 for three months and make an assessment for yourself. It won't hurt your car in the least.

You won't really know that unless you bore scope the tops of every piston.
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Old 03-20-2012, 09:10 AM
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Default Re: 87 vs 91 octane

Quote:
Originally Posted by 427435 View Post
You won't really know that unless you bore scope the tops of every piston.
The Genesis V8 manual says you can use 87, true?
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Old 03-21-2012, 03:38 AM
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Default Re: 87 vs 91 octane

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Quote:
Originally Posted by PMCErnie View Post
The Genesis V8 manual says you can use 87, true?
page 1-3 of the 2009 v8 manual:

"FUEL REQUIREMENTS
A020101ABH-EU
3.8 engine
Your new vehicle is designed to use only
unleaded fuel having a pump octane
number ((R+M)/2) of 87 (Research
Octane Number 91) or higher.
4.6 engine
Your new vehicle is designed to use only
unleaded fuel having a pump octane
number ((R+M)/2) of 87 or higher.
For improved vehicle performance, premium
unleaded fuel with a Pump Octane
Rating of 91 (Research Octane Number
95) or higher is recommended.
Your new vehicle is designed to obtain
maximum performance with UNLEADED
FUEL, as well as minimize exhaust emissions
and spark plug fouling.

A020103AUN-EU
Gasoline containing alcohol and
methanol
Gasohol, a mixture of gasoline and
ethanol (also known as grain alcohol),
and gasoline or gasohol containing
methanol (also known as wood alcohol)
are being marketed along with or instead
of leaded or unleaded gasoline.
Do not use gasohol containing more than
10% ethanol, and do not use gasoline or
gasohol containing any methanol. Either
of these fuels may cause drivability problems
and damage to the fuel system.
Discontinue using gasohol of any kind if
drivability problems occur.
Vehicle damage or drivability problems
may not be covered by the manufacturer’s
warranty if they result from the use
of:
1. Gasohol containing more than 10%
ethanol.
2. Gasoline or gasohol containing
methanol.
3. Leaded fuel or leaded gasohol."
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Old 03-21-2012, 07:38 AM
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Default Re: 87 vs 91 octane

89 Plus grade should not be overlooked in this discussion.
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