Does Octane Matter?
Registered User
Joined: Jun 2010
Posts: 15
Likes: 0
I'll defer to your expertise. We're an engine rebuild shop, not tuners, and we typically work on BMW and Toyota vs. Dodge.
I have got to politely call BS on this one. YOU may not know, see or hear the difference but your ENGINE does.
Again, if you have a tuner and can look at your PID logs and read the differences in those PID and tuning logs from 87 to 93 you will see a world of difference.
Just because you can run a tank or 87 (or even several) and not have any adverse side affects does not mean your knock sensors dont notice the lesser grade fuel.
Again as and said in port #22, sure it will work but if you truly understand the internals and designs of an engine and blends of fuel, you will know what you can and should use.
And yes, you are right that Dodge Ram PCMs do not auto adjust base spark or other tuning features. Those have to be written to the PCM via custom tuning.
Again, if you have a tuner and can look at your PID logs and read the differences in those PID and tuning logs from 87 to 93 you will see a world of difference.
Just because you can run a tank or 87 (or even several) and not have any adverse side affects does not mean your knock sensors dont notice the lesser grade fuel.
Again as and said in port #22, sure it will work but if you truly understand the internals and designs of an engine and blends of fuel, you will know what you can and should use.
And yes, you are right that Dodge Ram PCMs do not auto adjust base spark or other tuning features. Those have to be written to the PCM via custom tuning.
Professional
Joined: Feb 2010
Posts: 183
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From: texas
this gives me kind of a sour feeling. in a few months im supposed t get my dads truck which is an 07 hemi. and it has 60000 miles and he has run the lowest gade fuel since the day hes gotten it which im pretty sure is 87. You guys think the engine will have quite a bit of suffering from this?
Administrator
Joined: Jul 2007
Posts: 24,686
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From: South Georgia/East Florida
I know guys who've run nuthin' but 87 octane on a Hemi and have well over 100k miles on it with no apparent problems, but I will say that most times when someone has a major cylinder issue on this engine, the owner has admitted to using primarily 87 octane fuel.
Hall Of Fame
Joined: Mar 2009
Posts: 19,168
Likes: 23
From: South GA
Here is a thread with some pics of someone use 87 too much and too often.....and now he knows it too
http://tinyurl.com/26fd7r8
http://tinyurl.com/26fd7r8