What octane

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What octane

Post by Easttnrhino » Sun Dec 04, 2016 8:33 am

What fuel grade are you running in 6.4
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Re: What octane

Post by ramv » Sun Dec 04, 2016 9:34 am

85 octane. I tried 87 and 91 and no notable difference.
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Re: What octane

Post by Easttnrhino » Sun Dec 04, 2016 9:58 am

Thanks
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Re: What octane

Post by Reloaderguy » Sun Dec 04, 2016 11:32 am

Ram recommends 89.

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Re: What octane

Post by Low_Sky » Sun Dec 04, 2016 11:50 am

I burn 88.5 in mine.


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Re: What octane

Post by waldo » Sun Dec 04, 2016 12:04 pm

89. I tried 87 when I first bought it but it didn't like it.
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Re: What octane

Post by Pit Slave » Sun Dec 04, 2016 12:05 pm

Octane? What altitude are you at?

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Re: What octane

Post by Easttnrhino » Sun Dec 04, 2016 12:15 pm

The town I live in is a little than 1000' above sea level but the area we like to go to tops out a little over 6000'
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Re: What octane

Post by Ducky's Dad » Sun Dec 04, 2016 1:24 pm

FWIW, my 5.7 is running the Edge 87 Performance Tune, and it's quite happy in the winter (So Cal) on 87, but I run 89 in warmer weather (up to 100+F), and when it's really hot (AZ, 115+F) I often run 91. I have been told by mechanics who are supposed to know these things, that the Hemis have a tendency to hole pistons if there is much pre-ignition. The ECM minimizes that, but long grades on hot days at high speeds probably test the limits.

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Re: What octane

Post by LagunaH1 » Sun Dec 04, 2016 1:27 pm

I run 91


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Re: What octane

Post by olyelr » Sun Dec 04, 2016 2:46 pm

I have always put in regular, which i think is 87 around here. I tried 89 and 91 once but never noticed any changes. No spark knock or anything with regular, so thats what i keep putting in it.
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Re: What octane

Post by Reloaderguy » Sun Dec 04, 2016 3:37 pm

olyelr wrote:I have always put in regular, which i think is 87 around here. I tried 89 and 91 once but never noticed any changes. No spark knock or anything with regular, so thats what i keep putting in it.
Nor would you notice. However, the truck will pull out timing if the knock sensors pick up detonation.

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Re: What octane

Post by OffroadTreks » Sun Dec 04, 2016 5:13 pm

89 because that's what the book says. It can handle 87 and I do that around town. I have noticed it gets better MPG with 89 towing.
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Re: What octane

Post by TwinStick » Mon Dec 05, 2016 1:22 am

Mine is 5.7L 3rd Gen. I run reg 87 most times. If i know i am gonna be towing, i run the tank down & use 91 or above. Yes, it does get better mpg running higher octane when towing. But in my truck, it's about 1-2 mpg @ most. :lol:

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Re: What octane

Post by pdavey » Mon Dec 05, 2016 10:11 am

I run Shell VPower 93 in both my Challenger SRT8 and my Power Wagon.

Challenger SRT8 calls for 93, but I use the VPower in the truck because of the other benefits of a cleaner engine which I saw first hand when I took it apart for my head gasket leak.

You don't get any other benefit from the 93 in the truck unless you run a performance tune.

I only run Shell gas in my cars.

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Re: What octane

Post by olyelr » Mon Dec 05, 2016 8:06 pm

pdavey wrote:I run Shell VPower 93 in both my Challenger SRT8 and my Power Wagon.

Challenger SRT8 calls for 93, but I use the VPower in the truck because of the other benefits of a cleaner engine which I saw first hand when I took it apart for my head gasket leak.

You don't get any other benefit from the 93 in the truck unless you run a performance tune.

I only run Shell gas in my cars.

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Is the gas any different than any other station? I always was under the assumption that the "v power" was probably just a typical marketing scam. Spill the beans!
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Re: What octane

Post by Taylor04 » Tue Dec 06, 2016 2:11 pm

LagunaH1 wrote:I run 91


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Re: What octane

Post by Will » Tue Dec 06, 2016 2:44 pm

olyelr wrote:
pdavey wrote:I run Shell VPower 93 in both my Challenger SRT8 and my Power Wagon.

Challenger SRT8 calls for 93, but I use the VPower in the truck because of the other benefits of a cleaner engine which I saw first hand when I took it apart for my head gasket leak.

You don't get any other benefit from the 93 in the truck unless you run a performance tune.

I only run Shell gas in my cars.

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Is the gas any different than any other station? I always was under the assumption that the "v power" was probably just a typical marketing scam. Spill the beans!
There is something to be said about Shell 93, when you run in something that really performs, you can tell the difference. Sunoco 93 is good also. I run a 93 tune in the 5.7 truck because it gets better gas mileage and runs sooo much better than 87 or 89. It hates 87, did since day one and yes the book calls for 89 minimum. I can tell the difference in between gas stations in the Challengers 392. I stopped at a Marathon and it lost some low end until I refilled with Shell again. My old Hayabusa loved Shell gas also, I plugged into it and could change the tune after data logging. Either Shell or Sunoco for me, if not available, BP Ultimate is good too. I quit looking at gas prices when I bought the PW. :lol:
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Re: What octane

Post by ramv » Tue Dec 06, 2016 11:24 pm

I refused to buy Shell fuel for many years as they were one of my major customers, and one of the worst I have ever dealt with. This was pre-BP Mocando/ Deep Water Horizon but a worse attitude than BP. Whatever the service company said or did was wrong. We eventually walked on hundreds of millions of dollars of contracts with them and allocated resources elsewhere.

Now, a decade later, I try to purchase the fuel with the least ethanol. Unfortunately in Colorado, Shell V Power still uses ethanol negating the performance/mileage gain some of you are seeing. That is their big advantage in other states, but here 10% ethanol is very common. I filled up with 91 octane (the best you can get here) tonight (over 30 gallons) to try to see a difference, unfortunately still has ethanol.
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Re: What octane

Post by Mule » Wed Dec 07, 2016 12:08 am

I don't see much performance change in E0/E10, even between 85 and 87 octane.
If i'm towing a lot I'll throw the mid-grade stuff in there, seems to help under load.
I've fed the truck some old rotten fuel, when mixed with something decent/fresh it'll burn it just fine.
Higher octane won't improve performance; best fuel to run is the lowest that doesn't det.

Sled and moto get 91E0.... if not more. ;)
Bike pops/farts/stumbles a lot with 91E10... if I fill at the pump, it's probably more like 87E10 since so much of whatever's in the hose goes into the tank before the 91 starts coming out. (On the upside, it costs about $7 to fill from empty :cash: )
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Re: What octane

Post by Retired BLM Rig » Wed Dec 07, 2016 1:56 am

I took a class on fuel chemistry for a job I had once. Octane numbers rate a fuel's resistance to spontaneous combustion/pre-ignition caused by increases in pressure (compression) and temperature. Higher octane numbers don't mean more power, it simply reflects resistance to pre-ignition. Some pump gas does have more power due to a denser chemical composition (less alcohol). This may be the case with Shell V-Power. Also, someone else already mentioned this earlier, less pinging/knocking means the computer doesn't have to compensate by retarding the timing, resulting in more usable power. You could also run a lower octane fuel at 10,000 ft. than at sea level, due to the air being thinner, resulting in lower compression.

I used to think that faster burning fuel made more power, but the opposite is true. That's why top-fuel dragsters run nitromethane, it's a slower burning fuel. Once it ignites, it continues to burn and expand and force the piston down for the entire power stroke cycle, to the point that flames are still seen shooting out of the zoomies like a flame thrower. :rockon:

:rant: Corn squeezins (ethanol) is not as dense of a fuel as 100% pure gasoline, so there is less power (volatility) per gallon. You have to burn more of it to do the same work resulting in lower fuel economy. The government tells us we have to blend more ethanol into our gasoline because it's a cleaner burning fuel, but we have to burn more of it to do the same work... resulting in the same level of pollution, if not more! Don't get me started on the whole carbon credit fiasco! :doh: :doh: :doh:
:rant:

Ram engineers determined that 89 octane gasoline is the preferred fuel to use and 87 is acceptable, based on compression, temperature and a laundry list of other things I'm not even aware of.

Anyhow, that's my .02¢ on the subject. :patriot:


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Re: What octane

Post by Bill2014 » Wed Dec 07, 2016 9:19 am

Retired BLM Rig wrote:I took a class on fuel chemistry for a job I had once. Octane numbers rate a fuel's resistance to spontaneous combustion/pre-ignition caused by increases in pressure (compression) and temperature. Higher octane numbers don't mean more power, it simply reflects resistance to pre-ignition. Some pump gas does have more power due to a denser chemical composition (less alcohol). This may be the case with Shell V-Power. Also, someone else already mentioned this earlier, less pinging/knocking means the computer doesn't have to compensate by retarding the timing, resulting in more usable power. You could also run a lower octane fuel at 10,000 ft. than at sea level, due to the air being thinner, resulting in lower compression.

I used to think that faster burning fuel made more power, but the opposite is true. That's why top-fuel dragsters run nitromethane, it's a slower burning fuel. Once it ignites, it continues to burn and expand and force the piston down for the entire power stroke cycle, to the point that flames are still seen shooting out of the zoomies like a flame thrower. :rockon:

:rant: Corn squeezins (ethanol) is not as dense of a fuel as 100% pure gasoline, so there is less power (volatility) per gallon. You have to burn more of it to do the same work resulting in lower fuel economy. The government tells us we have to blend more ethanol into our gasoline because it's a cleaner burning fuel, but we have to burn more of it to do the same work... resulting in the same level of pollution, if not more! Don't get me started on the whole carbon credit fiasco! :doh: :doh: :doh:
:rant:

Ram engineers determined that 89 octane gasoline is the preferred fuel to use and 87 is acceptable, based on compression, temperature and a laundry list of other things I'm not even aware of.

Anyhow, that's my .02¢ on the subject. :patriot:
Great summary and write-up :cheers:

Just because we have the same engine doesn't mean that the same octane fuel will work the same way for all of us. Out here in the east, our elevations are generally lower so we produce more power and can't get away with anything less than 87 octane without some pinging and knocking. In higher elevations, it is possible to get away with lower octane fuel.

Regarding mileage, the Ethanol content is a significant factor. The 87 octane fuel in this area all contains about 10% ethanol which produces less power and lower fuel mileage. The local 93 octane does not contain ethanol..

In the Power Wagon I choose to run the 93 octane to avoid the Ethanol. Fuel cost is about a wash - the difference in price between the 87 Octane with ethanol and the 93 octane pure gasoline offsets the 1 mpg increase in fuel economy.
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Re: What octane

Post by Ducky's Dad » Wed Dec 07, 2016 11:46 am

In So Cal, all the gas (other than av gas and racing fuel) has 10% ethanol, so our power and mileage are automatically compromised. Add that to the generally warm to hot ambient temps and mountains the go to 11,500 ft (San Gorgonio), and you wind up with a heavy truck that is sluggish in the mountains in the summer. At sea level on a cold day, the PW is transformed.

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Re: What octane

Post by olyelr » Thu Dec 08, 2016 3:41 pm

I noticed today that a local gas station in my area has 90 octane that is 100% ethanol free. Would it be worth paying nearly a dollar more per gallon for this stuff (compared to 87)? I have no problem paying more for better gas, but just wondering if it would make a difference or if it is better for the truck.
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