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  #37  
Old 09-03-2014, 11:12 PM
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Re: 5.7L clunky and unrefined

There is at least one thread that talks about octane and IIRC the Hemi is not as efficient using the 93. I use both 89 & 87 and haven't picked up on a noticeable difference in performance from either nor clicking.

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  #38  
Old 09-03-2014, 11:30 PM
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Originally Posted by BigWave View Post
There is at least one thread that talks about octane and IIRC the Hemi is not as efficient using the 93. I use both 89 & 87 and haven't picked up on a noticeable difference in performance from either nor clicking.
For sure, since the ECU is programmed for 89, 93 will not combust properly and run less efficiently. You will most likely get worse gas mileage. Using the 87 might (mine does) cause a slight knock until the ECU senses the knock and pulls timing.

If towing, 89 should b used and 87 would probably give more of a knock under load.

This is for '14 only as '13 and earlier call for 87 I think.
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  #39  
Old 09-03-2014, 11:34 PM
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Re: 5.7L clunky and unrefined

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Originally Posted by 14SummitHemi View Post
For sure, since the ECU is programmed for 89, 93 will not combust properly and run less efficiently. You will most likely get worse gas mileage. Using the 87 might (mine does) cause a slight knock until the ECU senses the knock and pulls timing.

If towing, 89 should b used and 87 would probably give more of a knock under load.

This is for '14 only as '13 and earlier call for 87 I think.
this is where after market tuning come to play in. it can be tuned for a higher octane and that's where you see the real gains from it...

I know all I got is a lil ole 3.7 but its tuned for 91/93 and runs strong on it. if I dump 87 in it, it will run like crap...

All im saying is, its in the tune. On a stock tune, yes go for the recommended fuel or even one grade higher. (87 to 89)
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  #40  
Old 09-03-2014, 11:47 PM
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Originally Posted by Strongjeff View Post

this is where after market tuning come to play in. it can be tuned for a higher octane and that's where you see the real gains from it...

I know all I got is a lil ole 3.7 but its tuned for 91/93 and runs strong on it. if I dump 87 in it, it will run like crap...

All im saying is, its in the tune. On a stock tune, yes go for the recommended fuel or even one grade higher. (87 to 89)
Fo' shizzle...getting my Hemifever custom tune soon.
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  #41  
Old 09-04-2014, 12:35 AM
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Re: 5.7L clunky and unrefined

Just loaded my 91 octane custom tune from Sean at hemifever this evening. I'll run a log this weekend and have him tweak it next week. Only did a few test runs but definitely smoother shifting and more responsive throttle. Worth every penny to me at least.


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  #42  
Old 09-04-2014, 01:32 AM
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Originally Posted by BigCat View Post
Just loaded my 91 octane custom tune from Sean at hemifever this evening. I'll run a log this weekend and have him tweak it next week. Only did a few test runs but definitely smoother shifting and more responsive throttle. Worth every penny to me at least.

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  #43  
Old 09-11-2014, 02:46 PM
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Re: 5.7L clunky and unrefined

Its the infamous HEMI TICK. Search google and you'll see what I mean. My 2010 Hemi GC never did it but my 2012 Challanger RT sounded like a ticking time bomb! It seems some do it and some don't and some not as bad as others. Its normal and nothing to be concerned about. As far as refinement and having both motors the 3.6 is a lot more smoother and quieter but then again you really don't buy a muscle car engine for refinement
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  #44  
Old 09-11-2014, 03:11 PM
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Re: 5.7L clunky and unrefined

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Originally Posted by sanitarium16 View Post
Its the infamous HEMI TICK. Search google and you'll see what I mean. My 2010 Hemi GC never did it but my 2012 Challanger RT sounded like a ticking time bomb! It seems some do it and some don't and some not as bad as others. Its normal and nothing to be concerned about. As far as refinement and having both motors the 3.6 is a lot more smoother and quieter but then again you really don't buy a muscle car engine for refinement

Thanks, after doing some searching on that topic, I think I found my answers to why im getting that noise

1) Intake and exhaust valves do not have any kind of cushioning from the fuel. Fuel use to have higher amounts of sulfur and tetra ethyl or tetra methyl lead to lubricate and cushion intake and exhaust valves in the old days. When EPA decided to go to unleaded fuels, hardened valves and seats were produced trying to deal with the lack of lubricant. This was adequate at best, but did allow engines to live longer than if they had soft valves and seats. However, when they went to ethyl alcohol, that all changed. Alcohol absorbs moisture and strips lubricity. That was bad enough, but when they reduced the sulfur content from 130 parts per million (ppm) to 30 ppm, it really produced a perfect storm. Both the intake and exhaust valves are now hitting against the valve seats with no cushioning at all. This causes wear, and then of course....noise or TICK.

2) Fuel injectors depend on at least 70 ppm of sulfur to stay alive. When EPA went to the ethyl alcohol and less than 30 ppm, they have no cushioning allowing them to click or tick also while building up gum and varnish. This restricts the flow of fuel and turns the vaporized spray pattern into an atomized spray pattern. Atomized fuel doesn't burn as well, and helps wash down into the cylinders and wipes out the detergents and dispersants much faster. This is the second part of the Hemi Tick.
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  #45  
Old 09-11-2014, 07:04 PM
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Quote:
Originally Posted by Evolv0 View Post

Thanks, after doing some searching on that topic, I think I found my answers to why im getting that noise

1) Intake and exhaust valves do not have any kind of cushioning from the fuel. Fuel use to have higher amounts of sulfur and tetra ethyl or tetra methyl lead to lubricate and cushion intake and exhaust valves in the old days. When EPA decided to go to unleaded fuels, hardened valves and seats were produced trying to deal with the lack of lubricant. This was adequate at best, but did allow engines to live longer than if they had soft valves and seats. However, when they went to ethyl alcohol, that all changed. Alcohol absorbs moisture and strips lubricity. That was bad enough, but when they reduced the sulfur content from 130 parts per million (ppm) to 30 ppm, it really produced a perfect storm. Both the intake and exhaust valves are now hitting against the valve seats with no cushioning at all. This causes wear, and then of course....noise or TICK.

2) Fuel injectors depend on at least 70 ppm of sulfur to stay alive. When EPA went to the ethyl alcohol and less than 30 ppm, they have no cushioning allowing them to click or tick also while building up gum and varnish. This restricts the flow of fuel and turns the vaporized spray pattern into an atomized spray pattern. Atomized fuel doesn't burn as well, and helps wash down into the cylinders and wipes out the detergents and dispersants much faster. This is the second part of the Hemi Tick.
Idk...if that was the case then more engines would do it and not just the hemi. Like my 3.7 ticks but only cuz its cam is in the heads and you hear the cam opening the valves. Every 3.7 dose it that ive heard.

Ive heard of people curing the hemi tick by seafoam or by changing to a different viscosity oil.
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  #46  
Old 09-11-2014, 07:37 PM
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Quote:
Originally Posted by Evolv0 View Post

Thanks, after doing some searching on that topic, I think I found my answers to why im getting that noise

1) Intake and exhaust valves do not have any kind of cushioning from the fuel. Fuel use to have higher amounts of sulfur and tetra ethyl or tetra methyl lead to lubricate and cushion intake and exhaust valves in the old days. When EPA decided to go to unleaded fuels, hardened valves and seats were produced trying to deal with the lack of lubricant. This was adequate at best, but did allow engines to live longer than if they had soft valves and seats. However, when they went to ethyl alcohol, that all changed. Alcohol absorbs moisture and strips lubricity. That was bad enough, but when they reduced the sulfur content from 130 parts per million (ppm) to 30 ppm, it really produced a perfect storm. Both the intake and exhaust valves are now hitting against the valve seats with no cushioning at all. This causes wear, and then of course....noise or TICK.

2) Fuel injectors depend on at least 70 ppm of sulfur to stay alive. When EPA went to the ethyl alcohol and less than 30 ppm, they have no cushioning allowing them to click or tick also while building up gum and varnish. This restricts the flow of fuel and turns the vaporized spray pattern into an atomized spray pattern. Atomized fuel doesn't burn as well, and helps wash down into the cylinders and wipes out the detergents and dispersants much faster. This is the second part of the Hemi Tick.
Your original description had me thinking hemi tick with your "not a well oiled machine" and "sounds like a diesel" description but then you said it is only at speed/bounce off wall/tunnel. That does does not match up with the hemi tick. The hemi tick is only at idle and near it. Higher RPM's mask the tick.

Your valves may need adjusted.
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  #47  
Old 09-11-2014, 09:35 PM
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Re: 5.7L clunky and unrefined

My Acura 3.7 had the same tick at idle. I could only hear it in the garage or next to the retaining wall in my driveway. Neither the Acura 3.7 or Hemi 5.7 tick under acceleration. Both sound awesome when floored.


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  #48  
Old 09-11-2014, 09:43 PM
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My Acura 3.7 had the same tick at idle. I could only hear it in the garage or next to the retaining wall in my driveway. Neither the Acura 3.7 or Hemi 5.7 tick under acceleration. Both sound awesome when floored.

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