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  #21  
Old 09-16-2011, 02:16 AM
JumpSteady JumpSteady is offline
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That's a cool link. It does confirm the one gas station in my area that I knew advertised 100% gas for their 87 and 92 octane, but strangely their 89 octane has ethanol.

I only run 87 in everything I own. The exception being when I owned vehicles that specifically called for premium.
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  #22  
Old 11-07-2011, 11:23 PM
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Quote:
Originally Posted by jeman022004 View Post
This confirms the advice my dealer gave me. The tech said the computer starts to learn the pattern of your driving including the octane fuel you are using. He said if you use 87 then stick with it, if you use 89 stick with it... If you ever do change the best thing to do is remove your negative battery terminal for a short period of time to reset the computer so that it will begin learning the driving pattern.

With that said, I am hesitant to trust him 100% on this...
Interesting. Since I just bought my 2007, should I pull the battery terminal / PCM fuse? I'd think that it would adjust to 'my' driving habits fairly quickly now that I'm the one driving it. Am I incorrect?
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  #23  
Old 11-08-2011, 07:54 AM
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The computer will always adjust on its own, but when you take it off charge it wipes out it's "memory" so when you start it up again it's like it's first start and it has to relearn everything, so it learns quicker. It has no "memory" at that point so it will learn whatever your driving input is...if that makes any sense.

Anyone that's done big cams, head work, even long tubes on a fuel injected car knows that often when you first fire it up it will not idle on it's own without you feathering the gas pedal, as it has to learn the inputs from all the sensors and adjust to all the readings and what's going on with the engine.

I don't think there'd be any gain resetting the computer due to fuel. Most people use the resetting the computer trick for the drag strip.
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  #24  
Old 11-08-2011, 08:01 AM
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It also needs to be "reset" when installing a CAI or new exhaust system as the air flow ratio is different and can through the "ckeck engine" light. I agree with Sean ^^ you shouldn't need to rest it because you change octane.
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Old 11-09-2011, 10:39 PM
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I remember reading a chat session on a forum somewhere one time when the 4th gen trucks were first coming out. An actual dodge powertrain engineer that was involved with the development of these trucks was the guest, and he said that the 390 hp was obtained on 87 octane. He also said that the engine will make slightly more on 89, but that there's absolutely no gain by going to premium, and that by so doing you won't hurt the truck but you're wasting your money. I personally almost always put 87 in mine.
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Old 11-09-2011, 10:51 PM
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Ran 87 in mine for almost all of it's 64,000km. And for the last 30,000 or so I had run the diablo 89 tune. Just ot lazy and never pulled it after fuel prices spiked upwards last winter. Ran like a champ. Just traded the truck off and removed the tune to stock, noticeable difference for sure.
Oh forgot to mention that I would get 22mpg empty and 16 towing 8,000lb with that setup. I was impressed...
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Old 11-10-2011, 08:08 AM
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Quote:
I remember reading a chat session on a forum somewhere one time when the 4th gen trucks were first coming out. An actual dodge powertrain engineer that was involved with the development of these trucks was the guest, and he said that the 390 hp was obtained on 87 octane. He also said that the engine will make slightly more on 89, but that there's absolutely no gain by going to premium, and that by so doing you won't hurt the truck but you're wasting your money. I personally almost always put 87 in mine.
That's pretty spot on. The engine has enough compression and timing to possibly run on 89 octane and make more power. If you run on 87 it should be safe, and there is a knock sensor that may retard timing slightly if it senses knocking. Anything beyond 89 is a waste, on stock tune.
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  #28  
Old 01-26-2012, 08:20 PM
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I believe the higher the octane the slower the burn, hens the knock sensor. With a high compression engine and a lower running octane you will get pre detonation which can be ugly on a piston. The higher octane will burn slower and increase combustion temperature which reduces the proclivity to detonate. This allows for higher compression and an advance in timing which in turns allows the fuel to spark off when it is suppose to rather than when the piston is coming up in stroke. If you decide to put a tuner on and the tune recommends higher octane you better run the higher octane or engine will go boom. Seen it first hand. Running lower than recommend octane will burn holes fast in your piston. I tend to run mid grade 90 octane and have seen slight improvement over the low grade 88 offered here. 10 cents a gallon costs me 2 extra bucks per fill up.
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  #29  
Old 01-28-2012, 07:03 PM
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I believe you will find this site better. I use it to find all my local stations.

http://www.pure-gas.org/
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  #30  
Old 01-28-2012, 09:09 PM
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Quote:
Originally Posted by garner View Post
It depends on the gas station. I've seen some where they have no ethanol listed by 93 but I've seen others where they have the little ethanol sticker by all octanes
in Ontario there is no ethanol in 91 octane, I cant run ethanol in my sled so I run 91
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