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  #1  
Old 09-27-2011, 10:20 AM
charcoal5.9ram charcoal5.9ram is offline
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Default What octane do you guys run?

My manual says to only run 87 octane, so I have since the day it was new, but when I had my new exhaust installed I found myself leaning into it much more, thats when I started to hear the terrible pinging noise! I upped it to 89 octane and the pinging is gone. What do most od you guys run and why does the manual say to only run 87 octane???
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Old 09-27-2011, 10:57 PM
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I run 87 in mine and it seems fine. I'm assuming you put on a performance exhuast system. If thats the case the pcm could be adjusting the timing based on better exhuast flow.
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Old 09-27-2011, 11:22 PM
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Could be the ethanol, and like said, maybe the computer hasn't adjusted yet. If you haven't replaced the intake plenum gasket, I'd be getting it checked. That's a common symptom of a leaker. With the 5.9 compression ratio, you shouldn't have any problem with 87, ethanol or not.
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Old 09-29-2011, 07:53 PM
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i have no pinging or anything runnin 87 octane i have the throttle body upgrade a k&n drop in and a 21/2 inch exhaust with a gutted cat and flowmaster. although i do run around 91-93 octane normally..seems to give me a bit more throttle response and pickup
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Old 09-29-2011, 10:21 PM
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I run 93 with my sct 93 tune ! It's awesome !
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Old 09-30-2011, 11:58 AM
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i run 87 with the tb mod,headers,catless y,accel super coil and bigger plug wires and dont have any problems, and im ALWAYS standin on it
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Old 09-30-2011, 12:38 PM
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Quote:
Originally Posted by amermuscle View Post
I run 93 with my sct 93 tune ! It's awesome !
hows that sct work? the one i looked at was the one that ran only custom tunes. my truck will be built almost like yours and wondering about the sct. my buddy ran sct in a 6.0 powerstroke (ya its a lot different i know) but it really made that truck turn into an animal
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Old 10-01-2011, 11:29 PM
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Shouldn't be piniging with 87 octane unless theres another issue.
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Old 10-06-2011, 09:41 AM
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i ran 87 in mine and started hearing a ping, but im in school and cant afford driving 40 miles a day on 89 or 93, i just add a bottle of octane booster to every tank. no more pinging.
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Old 10-06-2011, 01:39 PM
charcoal5.9ram charcoal5.9ram is offline
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Quote:
Originally Posted by Okiespaniels View Post
Shouldn't be piniging with 87 octane unless theres another issue.
don't know what other issue there might be, seems to run fantastic to me. I will probably look into gettin the plenum gasket replaced, maybe thats what it is. either way, still no pingin on 89 octane.
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