Re: What grade fuel do you use in your 5.7 Hemi?
[Re: MidPenMopar]
#903501
01/13/11 11:48 AM
01/13/11 11:48 AM
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Joined: Apr 2003
Posts: 915 near New Haven, CT
fireeng
super stock
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super stock
Joined: Apr 2003
Posts: 915
near New Haven, CT
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you should double check your manual because I had a 2003 ram 2500 with the hemi and it did recommend 91 or above for fuel. I did some research back then and found that very few engines these days do need high octane fuel. The hemi falls into that category because it has high compression. I always ran mine on on 91 or above and never had any engine issues.........rust, however was a different story.
2016 Diesel Ram 3500 Mason Dump 1971 Challenger 2013 Jeep Wrangler 1979 Dodge Ram Power Wagon 400 Mini Pumper My other car is a Fire Truck.
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Re: What grade fuel do you use in your 5.7 Hemi?
[Re: fireeng]
#903502
01/13/11 11:53 AM
01/13/11 11:53 AM
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Joined: Dec 2003
Posts: 36,840 South San Francisco, Californi...
MidPenMopar
OP
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OP
Looking for fun? Keep looking
Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Quote:
you should double check your manual because I had a 2003 ram 2500 with the hemi and it did recommend 91 or above for fuel..
Ok maybe i missed it where is said 91 or better? I have been know to make mistakes once in awhile.
It's only like $0.20 a gallon more then 87 so i will start filling the tank with super from now on.
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Re: What grade fuel do you use in your 5.7 Hemi?
[Re: john55]
#903504
01/13/11 12:21 PM
01/13/11 12:21 PM
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Joined: Nov 2003
Posts: 810 Sidney Ohio
9SecRoadRunner
super stock
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super stock
Joined: Nov 2003
Posts: 810
Sidney Ohio
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I looked in my 05 owners manual and it said "recomend 89" , I just looked in my 07's and it says the same thing...have always ran 87 with no problems ever...if towing I'll use 91
You Thinking It's So Doesn't Make It a Fact
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Re: What grade fuel do you use in your 5.7 Hemi?
[Re: 70blackfish]
#903506
01/13/11 01:02 PM
01/13/11 01:02 PM
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Joined: Jan 2003
Posts: 1,633 Jacksonville, NC
RonP
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,633
Jacksonville, NC
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You are probably fine, but I believe they do better with a little more octane. I did have an 04 hemi truck and I always ran 87, but if I could go back in time I would probably have run atleast 89.
I only say that because of what I have noticed with my 2010 challenger. I run 93 now because of the tune, but I ran both 87 and 89 with the factory tune and data logging showed me quite a bit of knock on hard runs. I will also say that I could not hear it so just basing it off of sound doesn't mean it isn't happening or trying to happen.
just my .02
Last edited by RonP; 01/13/11 01:03 PM.
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Re: What grade fuel do you use in your 5.7 Hemi?
[Re: MidPenMopar]
#903509
01/13/11 04:18 PM
01/13/11 04:18 PM
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Joined: Nov 2004
Posts: 1,601 Hatfield,Pa.
bigD
top fuel
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top fuel
Joined: Nov 2004
Posts: 1,601
Hatfield,Pa.
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Stu, check the OM again as its in there some where. On mine, 89 as recommended in OM, 91 with diablo tune(W/CAI&180* T-stat),D
Last edited by bigD; 01/13/11 04:21 PM.
2015 Chrysler200s,2008 Charger R/T R&T,1999 Dakota R/T,1999 Viper ACR,1968 Charger R/T.
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Re: What grade fuel do you use in your 5.7 Hemi?
[Re: Kern Dog]
#903510
01/13/11 08:11 PM
01/13/11 08:11 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
I have 94,000 on a 2007 and I have run 87 octane almost exclusively. I have tried 89 and 91, but I couldnt tell any difference.
We use 87 in our 2005 hemi.
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Re: What grade fuel do you use in your 5.7 Hemi?
[Re: MidPenMopar]
#903512
01/13/11 08:51 PM
01/13/11 08:51 PM
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Joined: Feb 2009
Posts: 802 Houston, Texas
racerx20
Standard but OK
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Standard but OK
Joined: Feb 2009
Posts: 802
Houston, Texas
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I run 89 in my 2010 Hemi Ram, no issues!
1972 Road Runner
1988 Shelby CSX-T
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Re: What grade fuel do you use in your 5.7 Hemi?
[Re: racerx20]
#903513
01/13/11 09:15 PM
01/13/11 09:15 PM
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Joined: Aug 2005
Posts: 4,861 Riverside, Ca
R70RUNNER
master
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master
Joined: Aug 2005
Posts: 4,861
Riverside, Ca
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The California 87 swill here Stu, for Rene's magnum.... I've run 89 and I can't tell a diff
Current cars: 2000 Dak Quad Cab, 2012 Challenger,1970 Road Runner, 1994 Firehawk
1966 Coronet post sedan, 1988 Corvette, 2005 Magnum RT all SOLD
R70RUNNER<---VP Inland Empire Chapter of the MPM
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