What octane to runs best with new 2012 3.6L? 87,89,93? - Page 2 - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 09-12-2012, 11:43 AM   #31
Six
Jeeper
 
Six's Avatar
 
Join Date: May 2012
Location: Durtburg, WV
Posts: 1,202
Why would you use higher than recommend? It's not Turboed. There's not forced induction causing an high final compression ration.

Six is offline   Quote Quick Reply
Old 09-12-2012, 11:51 AM   #32
Jeeper
 
Join Date: Jul 2012
Posts: 15
I don't know why but where I live it seems like everywhere has 86, 88, and 90. I know you guys have been saying 87 so do you think I should go with the 86 or 88?

Begebro is offline   Quote Quick Reply
Old 09-12-2012, 11:54 AM   #33
Jeeper
 
Ltblue's Avatar
 
Join Date: Oct 2011
Location: NYC
Posts: 1,017
I still to this day have never put anything below premium..BUT I will try the 87 in my next fill-up just to see if there is a difference.
Ltblue is offline   Quote Quick Reply
Old 09-12-2012, 11:59 AM   #34
Jeeper
 
Jeeperz Creeperz's Avatar
 
Join Date: May 2012
Location: Pensacola, Fl
Posts: 897
Quote:
Originally Posted by Six View Post
Why would you use higher than recommend? It's not Turboed. There's not forced induction causing an high final compression ration.
------
It is the same rationalization for oil changes at 3,000 miles (during normal use). It makes them feel better for doing it, they have always done it and what is the hurt other than wasted $ (their reasoning not mine).
Jeeperz Creeperz is offline   Quote Quick Reply
Old 09-12-2012, 12:20 PM   #35
Six
Jeeper
 
Six's Avatar
 
Join Date: May 2012
Location: Durtburg, WV
Posts: 1,202
Quote:
Originally Posted by Jeeperz Creeperz View Post
------
It is the same rationalization for oil changes at 3,000 miles (during normal use). It makes them feel better for doing it, they have always done it and what is the hurt other than wasted $ (their reasoning not mine).
Ugh, my post looks like a five year old wrote it.

I have a tick, but I believe it's because of a future head swap I'm going to end up having on a Pentastar engine. It's not pinging from detonation.

I put 93 in my HD, but that's because I upgraded the engine and I'm running a higher compression ratio. I brain farted one day and put 87 in it (used to putting nothing but 93 in my toys after owning bikes that need it and turbo cars) and when on full throttle from low RPMS, you could hear the engine pinging away.

My Jeep doesn't ping at all under acceleration while using 87.
Six is offline   Quote Quick Reply
Old 09-12-2012, 12:34 PM   #36
Jeeper
 
DJ_B1R's Avatar
 
Join Date: Jun 2012
Posts: 184
Quote:
Originally Posted by Jeeperz Creeperz

------
It is the same rationalization for oil changes at 3,000 miles (during normal use). It makes them feel better for doing it, they have always done it and what is the hurt other than wasted $ (their reasoning not mine).
I've had Turbo cars and used to putting higher octane in my cars. I don't like the higher cost at the pump. plus like I stated earlier I've seen my friends cars run worse and ping using the lower grade. Guess in my mind with me always using it and no ping and running fine I continue to do it. If 87 works, that's great and cheaper.
DJ_B1R is offline   Quote Quick Reply
Old 09-12-2012, 12:55 PM   #37
Jeeper
 
Al Nebular's Avatar
 
Join Date: Sep 2011
Location: N. Delaware
Posts: 80
Quote:
Originally Posted by gixxer View Post
Ok 87 then. Just wanted to ask since going near below freezing weather the higher octane sometime idle and runs smoother on some engines. It all depends on how the computer is tuned and optimized.

In the old days a timing gun and turning the disturbutor really adds hp on high octane and today it's all about the computer tune. Thanks for everyone's help.
I hear you my friend, but the days of using a timing light and advancing the timing a few degrees are long gone. Now the ECU controls everything and using anything above 87 octane is a waste.
__________________
2012 JK Sport S
Al Nebular is offline   Quote Quick Reply
Old 09-12-2012, 01:05 PM   #38
Jeeper
 
Join Date: Sep 2012
Location: Detroit Metro
Posts: 54
If everything's in good shape then 87 is what you want. As others have said, higher octane burns slower, so if your engine doesn't need it, don't use it - it'll actually hurt performance in most cases. Higher octane is typically needed for high-compression or advanced engine timing. If your engine is rated at 87 and it's pinging under load, you may be running lean or have carbon build-up (i.e. higher compression). If your Jeep "likes" the higher octane gas then go ahead and run it. More than likely the seat-of-the-pants dyno is misleading (from my personal experience). When I was younger I swore the car went faster the louder I had the stereo. Just my $0.02 worth. I've worked in and been a fan of the automotive industry for a while and learned a lot (mainly from my own and others' mistakes).

Golden rule = smile on your face is worth lots of $
cnhmatthews is offline   Quote Quick Reply
Old 09-12-2012, 02:01 PM   #39
Jeeper
 
MikeK46's Avatar
 
Join Date: Mar 2012
Location: Long Island, NY
Posts: 1,650
Images: 4
Quote:
Originally Posted by chim-chim7 View Post
If someone is looking for good clean fuel for their Jk it should be Techron 87.
Techron is a fuel additive, so what did you mean by "techron 87"? Are you referring to filling up at Chevron? Or are you recommending any top-tier gas station?
__________________
12JK
MikeK46 is offline   Quote Quick Reply
Old 09-12-2012, 05:49 PM   #40
Newb
 
Join Date: Sep 2012
Posts: 2
Lots of inttresting stories here. You might want to read Octane rating - Wikipedia, the free encyclopedia And, don't miss the one sentence that states there is less energy when alcohol is added to the fuel. Unless you're in a state that requires Ethanol in all grades of gas, when you go to a higher octane rated fuel you may be using one with little or no ethanol. If so, then you will experience a performance and mpg improvement.
SteveKieffer is offline   Quote Quick Reply
Old 09-12-2012, 06:10 PM   #41
Jeeper
 
Join Date: Nov 2011
Posts: 158
I use 93 since we were getting such shitty gas mileage with 87. Were up 2-3mpg with 93 so were sticking with it. I dont notice any more power but I would think if I did the math 2-3 mpg would outweigh the extra 20cents a gallon
cmg427 is offline   Quote Quick Reply
Old 09-12-2012, 08:18 PM   #42
Jeeper
 
Join Date: Jul 2012
Posts: 16
If your going to run higher octane then take full advantage of it by doing a tune for higher octane gas. My Pro Comp tuner allows me to choose what octane I wish. Tune plus 89 got me an extra 2-3 mpg. Worth it?? Maybe maybe not?? Your call...2007 JK
__________________
2007 JK BFG TA's 315 70R 17
4.56 gears Warn #9000 on front
2" OME lift
Eastern Oklahoma
kvhall08 is offline   Quote Quick Reply
Old 09-12-2012, 11:01 PM   #43
Jeeper
 
chim-chim7's Avatar
 
Join Date: Apr 2012
Location: Lakeside, California
Posts: 694
Quote:
Originally Posted by MikeK46 View Post
Techron is a fuel additive, so what did you mean by "techron 87"? Are you referring to filling up at Chevron? Or are you recommending any top-tier gas station?

Yes I was referring to Chevrons fuel which uses the additive Techron. If you JK pings with 87 its most likely cheaply refined fuel, or carbon build up on the domes and valve faces from running higher octane fuel. Eventually it will ping with 91 or 93 as the build up gets worse. When your piston domes are carbon fouled you decrease the amount of space in your combustion area. That leads to detonation.
Two things need to be done here, one is a Seafoam treatment, and the other is to run several full tanks of low octane Chevron fuel. When you clean off the bulk of the deposits you should have no more problems running 87 again.
chim-chim7 is offline   Quote Quick Reply
Old 09-13-2012, 12:27 AM   #44
Sr. "Honey-Bucket" Engr.

WF Supporting Member
 
71K5's Avatar
 
Join Date: Nov 2011
Location: Idaho
Posts: 400
Images: 26
Quote:
Originally Posted by SteveKieffer View Post
Lots of inttresting stories here. You might want to read Octane rating - Wikipedia, the free encyclopedia And, don't miss the one sentence that states there is less energy when alcohol is added to the fuel. Unless you're in a state that requires Ethanol in all grades of gas, when you go to a higher octane rated fuel you may be using one with little or no ethanol. If so, then you will experience a performance and mpg improvement.
The exact reason I buy 92 octane. It is the only local gas I can find without ethanol.
71K5 is offline   Quote Quick Reply
Old 09-13-2012, 12:32 PM   #45
Jeeper
 
MikeK46's Avatar
 
Join Date: Mar 2012
Location: Long Island, NY
Posts: 1,650
Images: 4
Quote:
Originally Posted by chim-chim7 View Post
Yes I was referring to Chevrons fuel which uses the additive Techron. If you JK pings with 87 its most likely cheaply refined fuel, or carbon build up on the domes and valve faces from running higher octane fuel. Eventually it will ping with 91 or 93 as the build up gets worse. When your piston domes are carbon fouled you decrease the amount of space in your combustion area. That leads to detonation.
Two things need to be done here, one is a Seafoam treatment, and the other is to run several full tanks of low octane Chevron fuel. When you clean off the bulk of the deposits you should have no more problems running 87 again.
Unfortunately there aren't any Chevrons in my area, the nearest one is in the next state over. I've been using mostly Hess, and occasionally Shell.
__________________
12JK
MikeK46 is offline   Quote Quick Reply
Old 09-13-2012, 12:50 PM   #46
Supporting Member

WF Supporting Member
 
SilverSport's Avatar
 
Join Date: May 2011
Posts: 21,901
Send a message via Yahoo to SilverSport
You can buy Techron in bottles at any autoparts store if you don't have any local Chevron stations. One bottle every 3K miles.
__________________
"Own a Jeep and own a piece of history."

"The Hunter is not concerned with the opinion of the Wolf."
SilverSport is offline   Quote Quick Reply
Old 09-13-2012, 03:48 PM   #47
Jeeper
 
Geoscene's Avatar
 
Join Date: Jul 2012
Location: Moonshine Hill, Texas
Posts: 297
Images: 4
Quote:
Originally Posted by Begebro View Post
I don't know why but where I live it seems like everywhere has 86, 88, and 90. I know you guys have been saying 87 so do you think I should go with the 86 or 88?
87 = 86 in higher elevations. That is why your fuel has lower octane ratings than those of us at sea level. At higher elevations, the pressure in the combustion cylinder will be reduced because you are starting out with lower pressure due to altitude. In places like Washington where you can go from 10,000'+ to sea level easily in one tankful, I would take it easy if I had filled up with 86 in the mountains. (I don't live there so I don't know what they sell in the mountains there - I would just be a little cautious)

A little random pinging is OK although if it pings continually, I would start checking for the reason. I would not move up a grade in gasoline to solve the problem. I would make sure the combustion chambers are clean first and if it still pings, check the spark plugs.

The only time I use higher octane is when I fill up the Mustang which has an 8 psi boost from the supercharger and requires 91+ octane.
__________________
My Flickr photostream:
http://www.flickr.com/photos/19387539@N00/
Geoscene is offline   Quote Quick Reply
Old 09-14-2012, 02:29 AM   #48
Jeeper
 
Join Date: Jul 2012
Posts: 521
Quote:
Originally Posted by Jeeperz Creeperz

------
It is the same rationalization for oil changes at 3,000 miles (during normal use). It makes them feel better for doing it, they have always done it and what is the hurt other than wasted $ (their reasoning not mine).
Do it properly then! Go to Home Depot and buy some straight Toluene! Mix 1 galon of Toluene to 4 gallons of gas, add a small cap of engine oil and go nuts with your home made race fuel. Should get around 100 octane by ricemath
bloodfart is offline   Quote Quick Reply
Old 09-14-2012, 03:48 AM   #49
Newb
 
Dvj Vegas's Avatar
 
Join Date: Sep 2012
Location: Raleigh N.C
Posts: 3
I just put 87 in and i cant tell a change like i did going from 87 to 94 so maybe it was all in my head! Thanks for all the info
Dvj Vegas is offline   Quote Quick Reply
Old 09-16-2012, 07:18 AM   #50
Jeeper
 
Join Date: Jan 2012
Posts: 51
Images: 1
Todays engine management systems with spark knock sensors can retard the timing to avoid engine damage(but at a cost to engine performance).Using a higher octane rating allows the engine to advance the timing a lot farther and thus giving much better performance.ýin your malual it states that your vehicle was designed to run on 87 octane (and it was) but running higher octane will not hurt the engine as todays gasoline has detergents in it to help elininate carbon build up it is a non issue unless most of the driving is in short trips ,not allowing the engine to fully heat up.I have used supreme gas for many years in my vehicles with NO bad effects.
newrubi is offline   Quote Quick Reply
Old 09-16-2012, 12:46 PM   #51
Jeeper
 
Join Date: Jul 2012
Posts: 521
Quote:
Originally Posted by newrubi
Todays engine management systems with spark knock sensors can retard the timing to avoid engine damage(but at a cost to engine performance).Using a higher octane rating allows the engine to advance the timing a lot farther and thus giving much better performance.ýin your malual it states that your vehicle was designed to run on 87 octane (and it was) but running higher octane will not hurt the engine as todays gasoline has detergents in it to help elininate carbon build up it is a non issue unless most of the driving is in short trips ,not allowing the engine to fully heat up.I have used supreme gas for many years in my vehicles with NO bad effects.
Yeah but naturally aspirated engines have a SMALL window in which they can play, because they only need to try to make up for day to day stuff like hot days, going up mountains, etc... A forced induction engine will have a WAY LARGER window in which to adjust things, to compensate for the wild swings between going into boost and not being in boost. Those engines will be able to actually USE the higher octane all the time, where NA engines will only see benefits on hot days
bloodfart is offline   Quote Quick Reply
Old 09-16-2012, 12:50 PM   #52
Jeeper
 
JKWrangler2012's Avatar
 
Join Date: Oct 2011
Location: Greensburg
Posts: 589
Quote:
Originally Posted by sparky View Post
If you are pinging, you are in the wrong gear. Downshift.
what should i do when it pings in first??

i too have experienced positive results with higher octane gasoline. scream at me all you want. "you're wasting money!" "you're not experiencing any performance benefits!" "you're causing harmful deposits!" [psst... i will continue to run 93o! nah nah nah nah nah]

i would put money on if i had the 3:73's or [numerically] higher gears, i wouldn't have been hearing the pinging near as much as i was. alas, i have 3:21's and a 6speed on factory 31's. haven't had pinging return while running 93o. not once.
JKWrangler2012 is offline   Quote Quick Reply
Old 09-17-2012, 10:01 PM   #53
Jeeper
 
bama2012rubicon's Avatar
 
Join Date: Feb 2012
Location: S.E. Alabama
Posts: 49
My 2012 noticeably has more power with 93 octane. I also ran ethanol free 87 and 93 octane. I can't tell the difference between ethanol free and that with ethanol, but a big difference between 87 and 93.
bama2012rubicon is offline   Quote Quick Reply
Old 09-18-2012, 07:44 AM   #54
Jeeper
 
chim-chim7's Avatar
 
Join Date: Apr 2012
Location: Lakeside, California
Posts: 694
Quote:
Originally Posted by bama2012rubicon View Post
My 2012 noticeably has more power with 93 octane. I also ran ethanol free 87 and 93 octane. I can't tell the difference between ethanol free and that with ethanol, but a big difference between 87 and 93.

Thats called willful philistinism. If you actually put it on a dyno and ran the fuels for the numbers, you would be disappointed. Since that would be expensive and time consuming, try the less expensive route. Save your money for retirement, not premium fuel.

Run your tank down so that you are running on fumes. Have your wife, girlfriend or significant other fill your tank with either 87, 91, or Jack Daniels for that matter. Make sure they donít tell you which octane they bought. Repeat the process several times by changing the octane and journal your impression of the results. The drug companies refer to this as eliminating the placebo effect. Your answer will be very clear.
chim-chim7 is offline   Quote Quick Reply
Old 09-18-2012, 04:54 PM   #55
Jeeper
 
JKWrangler2012's Avatar
 
Join Date: Oct 2011
Location: Greensburg
Posts: 589
Quote:
Originally Posted by chim-chim7 View Post
Thats called willful philistinism. If you actually put it on a dyno and ran the fuels for the numbers, you would be disappointed. Since that would be expensive and time consuming, try the less expensive route. Save your money for retirement, not premium fuel.

Run your tank down so that you are running on fumes. Have your wife, girlfriend or significant other fill your tank with either 87, 91, or Jack Daniels for that matter. Make sure they donít tell you which octane they bought. Repeat the process several times by changing the octane and journal your impression of the results. The drug companies refer to this as eliminating the placebo effect. Your answer will be very clear.

bro! i too can tell of a NOTABLE difference. not per se in extra horsepower.. but the over all performance of the engine. seriously. no bull. not crazy.
i ask; your rig auto?

[some of us manual aficionados can feel the slightest differences]
JKWrangler2012 is offline   Quote Quick Reply
Old 10-01-2012, 12:26 PM   #56
Jeeper
 
Ltblue's Avatar
 
Join Date: Oct 2011
Location: NYC
Posts: 1,017
Quote:
Originally Posted by Ltblue View Post
I still to this day have never put anything below premium..BUT I will try the 87 in my next fill-up just to see if there is a difference.
I am back with my verdict.. As stated, yes you can use 87/regular but there IS a difference when driving with reg and premium. I feel like there is a slight power loss when you are using the 87(there is no umpf/power when you press on the pedal) will definitely be using the premium again.
Ltblue is offline   Quote Quick Reply
Old 04-28-2013, 03:41 AM   #57
Newb
 
Join Date: Apr 2013
Posts: 3
I posted that I got better mileage with 89 octane locally and it feel like it has more power. I tried it on a trip no difference same mileage as the 87 octane. Even when I came back the local mileage was the same. But I still stand by that 89 octane feel like the jeep has more guts, shift earlier going up through the gears. When down shifting for hills shift later for power it feels better, mileage I don’t know will have to trend it more for better results.
justbill is offline   Quote Quick Reply
Old 04-28-2013, 06:40 AM   #58
Jeeper
 
Fellows's Avatar
 
Join Date: Jun 2012
Posts: 419
Quote:
Originally Posted by justbill View Post
I posted that I got better mileage with 89 octane locally and it feel like it has more power. I tried it on a trip no difference same mileage as the 87 octane. Even when I came back the local mileage was the same. But I still stand by that 89 octane feel like the jeep has more guts, shift earlier going up through the gears. When down shifting for hills shift later for power it feels better, mileage I don’t know will have to trend it more for better results.
I think that's the placebo effect they were referring to earlier. There's no technical reason why it would have more guts unless by chance you're using better quality gas to begin with. Gas prices are high enough already, don't just willingly hand over more money because of your feelings from an unscientific observation.
Fellows is offline   Quote Quick Reply
Old 04-28-2013, 08:23 AM   #59
A-14

WF Supporting Member
 
1Topp's Avatar
 
Join Date: Oct 2011
Location: BarkCamp Ga.
Posts: 1,438
Images: 73
Quote:
Originally Posted by ESP View Post
87

__________________


A-14 Build
A-14 Profile
A-14 Pics
1Topp is offline   Quote Quick Reply
Old 04-28-2013, 07:20 PM   #60
Jeeper
 
rics1997's Avatar
 
Join Date: Oct 2010
Location: Bristol, Tn
Posts: 4,764
One thing I have been running that last month is 100% gasoline, 87 octane. I am getting 1.3 mpg increase since moving away from 10% ethanol.

__________________
2010 Dark Charcoal Pearl Jeep Wrangler Sport S Automatic
4.88 Yukon w/Trac-Lok rear and Eaton ELocker Front - Synergy Gussets - B&M 70264 Trans Cooler
BDS 3" lift - BDS Fox 2.0 Racing Shocks
XHD front Bumper - Trektop NX - Goodyear MT/R w/Kevlar 35X12.5X15 on MB Chaos 5 Wheels - Thrush Turbo Muffler

Become a WranglerForum Supporting Member!
rics1997 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2012 Wrangler information thread Milous JK General Discussion Forum 1605 07-17-2013 02:45 PM
2012 Wrangler & June 2nd ndrugby JK General Discussion Forum 13670 03-11-2013 12:15 PM
2012 JK tow ratings with the 3.6L Jeepstin JK General Discussion Forum 41 09-11-2012 08:57 PM
2012 Auto-Journalist's Review zznalg JK General Discussion Forum 6 08-21-2011 08:17 PM
Octane Question hedonist TJ General Discussion Forum 16 01-06-2008 07:32 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 11:23 AM.



Jeepģ, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC