2015 6.4 Hemi EGR Issues?

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PWJouster
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Re: 2015 6.4 Hemi EGR Issues?

Post by PWJouster » Mon Jul 30, 2018 10:03 am

the truck calls for 89....use it.

i remember driving my grandfathers S550 and Bentley with the 4.0TT.
he strictly uses 87....talk about boats. i use 89 on every natural aspirated vehicle ive owned. and 100% of the time, you will see improvement in the upgraded fuel.

you can not feed a motor anything less then what it calls for.


please dont ever use anything but 91-93 on boosted applications.
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NickTF
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Re: 2015 6.4 Hemi EGR Issues?

Post by NickTF » Mon Jul 30, 2018 12:33 pm

Fuel Selection – 5.7L/6.4L Engines 87 Octane Acceptable - 89 Octane Recommended.

The above directly from the owners manual. Calls for sounds like mandatory which 89 octane is not.

Like I stated before I intend to give a higher octane gas a shot but i'm 90% sure it won't have any impact on my issues as I hear no spark knocking. The fact that the surging occurs at light throttle lower load scenarios suggest the issue has nothing to do with octane. If the surging occurred at higher load and spark knock was heard i'd expect higher octane gas to help.

p.s. A hd truck gas motor required to run on 89 octane is quite stupid imho. How many fleet 4500/5500 trucks with the same 6.4 hemi (albeit hp limited I believe due to a lower rpm limit) are filling up with 89 octane you think? I'm not debating benefits, just simply stating its a stupid requirement. This isn't a high compression toy, it's a 10 to 1 compression truck motor meant to do truck things.

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PWJouster
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Re: 2015 6.4 Hemi EGR Issues?

Post by PWJouster » Mon Jul 30, 2018 1:04 pm

its the quality of 87octance gas on a national basis. 87 octane in south florida, is not like 87 octane in NJ in the wintertime...
forego the possible issues by using 89.

87 is fine even in a Ferrari...its just going to act and drive like trash.

surging is all part of the MPG tuning we get from factory.

do you have MDS?
do you use tow Mode ever?
2018 Powerwagon
Thuren King 3.0-S3 & 2.5-S2 with King Stab, TBs, Boogies and
Dodge-Off-Road Steering Brace
Method NV 17s
Toyo RT 35x12.5/17
Purple Cranium F&R
S&B Intake
Exhaust

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Re: 2015 6.4 Hemi EGR Issues?

Post by BoldAdventure » Mon Jul 30, 2018 2:39 pm

PWJouster wrote:
Mon Jul 30, 2018 1:04 pm
its the quality of 87octance gas on a national basis. 87 octane in south florida, is not like 87 octane in NJ in the wintertime...
forego the possible issues by using 89.

87 is fine even in a Ferrari...its just going to act and drive like trash.

surging is all part of the MPG tuning we get from factory.

do you have MDS?
do you use tow Mode ever?
Yup, blends are different, even in some states, those blends change based on state environmental standards.
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