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HEMI what octane gas do you use????

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  #1  
Old 05-17-2005, 10:04 PM
bpunk360 bpunk360 is offline
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Default HEMI what octane gas do you use????

i have a 05 dodge ram QC HEMI 2500....... book says to use 89 so i use 89. but i dont use shell or mobil or any name brand gas. maybe only once a month i use those........ other gas places are cheaper.......... does anyone have a problem using 87....????

just looking for everyones 2 cents....
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Old 05-17-2005, 10:09 PM
Gone Fishin Gone Fishin is offline
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Default RE: HEMI what octane gas do you use????

bpunk360,

I use 87 octane gas from meijer gas station (generic). I currently have 700-800 miles on the new engine and I'm getting 15+ mpg with mostly highway use. I don't push the engine often--full throttle, as it a new engine. The throttle by wire ECU should accomodate this. If I was going to tow anything heavy, then I would fill up with the 89 stuff.
My 2 1/2 cents--Hope it helps!
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Old 05-17-2005, 10:21 PM
bpunk360 bpunk360 is offline
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Default RE: HEMI what octane gas do you use????

ye am in NJ im using wawa,racestar,pitstop gas........ u no all the cheaper no name brand gas stations........ its all the same stuff practically. next tanks gunna be 87 octane (truck has 6,000 miles on it) i figured since i use no name gas i might not wann use the 87 but il try the 87....... THANKS FOR THE INFO
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Old 05-17-2005, 10:36 PM
guido7 guido7 is offline
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Default RE: HEMI what octane gas do you use????

me, well I use 87, and it runs fine.... never used 89, so I dont know the diff... but the engine runs well with the 87, and I horse it a lot... good days I get 14-15, bad days 10-12....... foot in the intake that is...
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Old 05-17-2005, 11:27 PM
IrishRagE IrishRagE is offline
 
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Default RE: HEMI what octane gas do you use????

Read the manual...you're supposed to use plus(88-89)
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Old 05-17-2005, 11:29 PM
mill500 mill500 is offline
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Default RE: HEMI what octane gas do you use????

Always used the 89, but never a name brand (Shell, Mobil, etc.) so I can't say how it would run on 87.
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Old 05-17-2005, 11:51 PM
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Default RE: HEMI what octane gas do you use????

I've ran 87 in mine before and would get a spark knock. I've Ran 89 for a long time and don't have any problems...but only get about 10 MPG around town.
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Old 05-17-2005, 11:52 PM
DonG DonG is offline
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Default RE: HEMI what octane gas do you use????

The 04 manual says you can run 87 -89.

I've run 87 for the last 18,000 without problems. I even run it while towing. I don't use a particular brand. Many different brands come from the same refinery anyway.
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Old 05-17-2005, 11:57 PM
moparturd moparturd is offline
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Default RE: HEMI what octane gas do you use????

This subject seems to pop up every couple of weeks.

The manual says 89 is recommended, but it will run on 87.

Why does it run on 87???? Anyone??? Because the computer is taking timing out of the motor. When you take timing out of the motor, assuming it is set to maximize the recommended 89 gas, you don't make as much power. You'll be better off running the recommended fuel.
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Old 05-18-2005, 02:00 AM
guido7 guido7 is offline
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Default RE: HEMI what octane gas do you use????

Todd, if thats the case, should I run 89 when I go to the strip?? and should I start doing it now, so as to adjust the computer to the change??? Mine runs well on 87, but I DO want optimum performance when I race it.....
Let me know....................GUIDO
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Old 05-19-2005, 12:57 AM
ce2flaco ce2flaco is offline
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Default RE: HEMI what octane gas do you use????

Mine knocks under full throttle when i run 87. I run 91 normally and the difference is huge. As for the what to run at the track question: race fuel of course[sm=gears.gif]
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Old 05-19-2005, 01:06 AM
moparturd moparturd is offline
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Default RE: HEMI what octane gas do you use????


Quote:
ORIGINAL: guido7

Todd, if thats the case, should I run 89 when I go to the strip?? and should I start doing it now, so as to adjust the computer to the change??? Mine runs well on 87, but I DO want optimum performance when I race it.....
Let me know....................GUIDO

I think it's the best thing to do, but you know your truck better than me. I can see a difference in the mileage as well as feel one in the performance. Maybe with the ultra-low gearset, it's not as eveident for you.
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Old 05-19-2005, 04:43 PM
DonG DonG is offline
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Default RE: HEMI what octane gas do you use????

I have run several consecutive tanks of 89 then switched back to 87. I could tell no noticable difference between the two and there was no difference in my MPG.

Mine doesn't ping on 87 even when towing 4000lbs. So in my case, 87 runs great my needs. I don't care if 89 could possibly give me an extra .1 in the 1/4 since I don't race and would not be embarassed if a Titan passes me.

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Old 05-19-2005, 06:02 PM
|3|ackAc|D |3|ackAc|D is offline
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Default RE: HEMI what octane gas do you use????

I use premium Racing Fuel 116 octane
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Old 05-19-2005, 09:21 PM
Silver Eagle Silver Eagle is offline
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Default RE: HEMI what octane gas do you use????

So, Your using Sunoco Purple, Why ? I hope you removed your converter first. Two much lead, three grams per gallon. How do I know this ? I used to make the stuff before retiring.
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Old 05-20-2005, 06:56 PM
Jeff17 Jeff17 is offline
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Default RE: HEMI what octane gas do you use????

The real answer is both simple and complicated (kind of like life). The only reason to increase the Octane rating is to prevent detonation and preignition (pinging, knocking and rattling of the piston in the cylinders).

If every engine were made to EXACT specifications and tested to perform with the EXACT same compression in each cylinder and engine (will never happen) THEN an exact Octane would work the same for all engines at the same altitude, humidity, temperature and throttle. Did you catch the number of variables involved?

If you do not have any detonation or preignition with 87 Octane then 89, 91, 100 or 119 is a waste of money and absolutely will not enhance HP. HOWEVER, you may not be able to detect minor detonation in your engine with CAI screaming and the Flowmaster hollering. So use your best judgement. If you not towing, or racing, or over heating and your engine sounds sweet using 87 Octane - use it. It sure wont hurt to try a tank of it for yourself.

Except for the 1st tack I've been using 87 Octane in Phoenix over two years and 51,000 mile without issues. Change your oil often and keep your ears open for different sounds from your engine. (Drive without the stereo on once in a while.)

By the way 119 is actually referred to as a Performance Number since pure Octane fuel can only be 100. All else has Heptane. Unless your driving at an altitude of 20,000 feet or so with a super charged engine, 119 Performance Rated fuel is like checking your oil using a $100 bill for an oil rag - waste of your resources.
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Old 05-20-2005, 08:10 PM
dntdodgeitramit dntdodgeitramit is offline
 
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Default RE: HEMI what octane gas do you use????

i have had my hemi for over 2 months, there has never been anything in it becides 91, i am running on 38inch tires and 22in rims with 11inch lift, i am geting around 300-320 a tank still, so i guess 91 makes a little difference.
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Old 05-20-2005, 08:18 PM
DonG DonG is offline
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Default RE: HEMI what octane gas do you use????

Quote:
ORIGINAL: dntdodgeitramit

i have had my hemi for over 2 months, there has never been anything in it becides 91, i am running on 38inch tires and 22in rims with 11inch lift, i am geting around 300-320 a tank still, so i guess 91 makes a little difference.
How do you know it makes any difference if "there has never been anything in it becides 91"?
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Old 05-20-2005, 09:24 PM
clk102293 clk102293 is offline
 
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Default RE: HEMI what octane gas do you use????


Quote:
ORIGINAL: DonG

How do you know it makes any difference if "there has never been anything in it becides 91"?

That is a very good question. Also, 300-320 miles per tank is a fairly good number for having an 11" lift and 38" tires. Maybe he has the larger tank (32 gal.?), because according to my calculations that would equate to about 11.5 to 12.3 MPG with the smaller tank. Seems high for the mods. The MPG would be about 9.4 to 10 MPG with the larger tank. Incidentally, I've run both 87 and 89 octane. The owners manual suggests 89 octane and states that 87 octane is acceptable, but does not recommend the use of Premium or high octane.
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Old 05-20-2005, 10:08 PM
moparturd moparturd is offline
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Default RE: HEMI what octane gas do you use????

Quote:
If you do not have any detonation or preignition with 87 Octane then 89, 91, 100 or 119 is a waste of money and absolutely will not enhance HP
That's not right. The computers are able to vary the ignition timing enough to prevent spark knock. That's the whole purpose of the knock sensor. By retarding the timing, to compensate for the spark knock induced by the lower octane fuel, you lose HP and torque.

But hey, it's your truck. If you weren't concerned about having the power, then why waste the extra money on the Hemi and required transmission?
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Old 05-20-2005, 10:08 PM
 
 
 
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