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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #11  
Old 12-18-2009, 12:37 AM
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174,340 miles today, diablo with 91 oct...no ill effects with ALL the miles. Recently changed the plugs an they were all golden brown. Although, I'm tryin to understand why it would ping with higher octane?
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  #12  
Old 12-18-2009, 01:07 AM
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Not sure on the high octane ping. It seems to me the opposite would be true, as octane is a measurement of RESISTANCE to ignition. You would think they would reccomend 89 or HIGHER, not lower. Maybe I can't read, I am from Kentucky.........



What's life if you can't crack on yourself right? Anyone care to clarify this Octane thing?
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  #13  
Old 12-18-2009, 01:28 AM
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see..that's the logic I know too...any pinging, increase octane..
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  #14  
Old 12-18-2009, 02:50 AM
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Quote:
Originally Posted by ALPINEX View Post
Well seems I've misworded something. I don't have a pinging now, the manual states to use 87 or lower octane, as 91-93 will cause a pinging. The question then relates to whether or not that info in the manual applies when the predator is added, or if its safe to run the 91. Sorry for the confusion fella's, regardless some good info here!
Higher octane gas will definitely not cause pinging, there's just no benefit to using a higher octane fuel than the engine was designed for. When we're talking about the octane rating of gasoline, it's a measurement of the knock resistance of the gasoline. The higher the number, the more resistent it is to knocking/pinging. See the link below for more information
http://en.wikipedia.org/wiki/Octane_rating

With a tuner though, you probably want to use the highest octane gas that is practical (i.e. 91-93. Race gas would be excessive, and expensive) so that you can use a relatively agressive tune to get more power, and maybe better fuel economy (the octane wouldn't be what causes mpg to go up, if anything it'd be maybe a leaner A/F or different timing. If nothing else, the higher octane would give you a wider range of A/F and timing to work with before getting knocking/pinging)
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Old 12-18-2009, 04:16 AM
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Great link! That goes right along with my (our?) thinking, I just can't put it into those words. But I believe the manual states 89 or LOWER to reduce pinging, I think that's what has us stumped. Can anyone else confirm this statement in the manual? Maybe Dodge is off their rocker?
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  #16  
Old 12-18-2009, 10:05 PM
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here's the quote from page 386 of the 2009 Ram 1500 Owner's Manual

Quote:
The 5.7L engine is designed to meet all
emissions regulations and provide satisfactory
fuel economy and performance when
using high quality unleaded gasoline having
an octane range of 87 to 89. The manufacturer
recommends the use of 89 octane
for optimum performance. The use of premium gasoline
is not recommended, as it will not provide any benefit
over regular gasoline in these engines.

Light spark knock at low engine speeds is not harmful to
your engine. However, continued heavy spark knock at
high speeds can cause damage and immediate service is
required. Poor quality gasoline can cause problems such
as hard starting, stalling, and hesitations. If you experience
these symptoms, try another brand of gasoline
before considering service for the vehicle.
so the only reason that higher octane gas is not recommended is because there aren't any benefits from it (and of course, this is just for the stock tune)
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  #17  
Old 12-19-2009, 12:09 AM
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Ah, maybe I miss read that to mean, that if you used 91 it will cause a spark knock, which is why I was confused, as that makes no sense at all.. I guess that clears it up then
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  #18  
Old 12-19-2009, 12:37 AM
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yeah, they could've written that section a little better to make it less confusing.
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