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Fuel System All Fuel Discussions. MPG - Mileage - Fuel System Maintenance including Air Filter Replacement.


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  #11  
Old 12-19-2010, 04:16 PM
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Mcbride Mcbride is offline
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Quote:
Originally Posted by RootBeer View Post
Just my humble opinion, I have to agree with HoustonHemi. With the 4Gen Rams they get great mpg considering what they are. I don't know the cost of the tuner justifies itself strictly for mpg.

Now, if you were to put true dual exhaust from the manifold back and get the tuner and a fully enclosed CAI, then I wold say the tuner would be of benefit.

But that's a lot of $$. The stock motor comes with a damn good CAI. Not as good as it could be but pretty close.

Really comes down to personal choice. In my case, I'm not messing with my motor. I get 20+mpg at 65mph. I'm happy.
WOW 20 MPG is great, i would be happy to get 18.
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  #12  
Old 12-19-2010, 09:18 PM
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My little RCSB gets 20 most of the time on the hwy driving 70 or less,,, It took about 15,000 miles for it to loosen up before it would do so!

Highest ever was 24.5 per EVIC. Went about 15 miles on the Beltway with a strong tailwind. Ran in 4 cyl mode continuous for all 15 miles.

I've disabled (turned off) the 'fuel saver' light because ever since the last dealer 'flash', it comes on A LOT, even when I'm not in 4 mode.

In order to know I'm in 4 mode, I use my Cortex to moniter intake manifold pressure and throttle percentage. The pressure lets me 'see' if I'm in 4 mode, and keeping the throttle at 20% max kept the pressure up (Pressure drops off 'significantly' when all 8 intake valves are opening)

About 90 is the max pressure I can run in 4 mode,,, Add any more pedal, and it kicks out of 4 mode. Runs about 50ish or less w/ all 8 cylinders running.

Once I'm in 4 mode, (in my truck with my gears), I can pretty much stay in 4 mode forever as long as I don't exceed 20% throttle.
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  #13  
Old 12-20-2010, 06:57 PM
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From my experience with tunners they are all good and have their pros and cons. The thing is to lay off the gas pedal after you tune the ECM. It's just like when you put an exhaust on your vehicle all you want to do is floor it every where....haha, at least that has been my experince.

One question I do ask is if you find a 2011 dodge ram 5.7 hemi please let me know because I cannot find one for my truck. I have a 2011 ram r/t and I am desparate to get a tunner but they all (tunner oems) say it will not work for the 2011.

Please let me know
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  #14  
Old 12-20-2010, 08:33 PM
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The Predator for the 2010 should work fine for the 2011 Hemi, but I'd double check with Diablo just to make sure.

Regarding which tuner, my understanding is that the Diablo is the only one that you can remove before taking it in for service and not leave an electronic footprint.

NOTE: During the Ram Hemi Engineer chat, the Engineers were emphatic that installing/using any kind of tuner/programmer will void the Drive Train warranty.
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  #15  
Old 12-20-2010, 10:41 PM
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it should but I called Diablo and they said no. I only wish I had one to try it out.
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  #16  
Old 01-16-2011, 10:44 PM
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I just got my 2011 after Thanksgiving 2010, trading in my Chevy Silverado. The performance impressed me, that's why I got it. But after 7500 miles I figure the performance cost me about 5 mpg. I drove to FL and back with a 6700 lb trailer. I got 10.5 from the chevy, with the Hemi I got between 7.25 to 9.5 mpg. But when I was going up hill with the Hemi, I could step on it and get around a truck. With the Chevy 5.3 it would take me a while to get around someone. Then after I dropped the trailer I drove out to Vegas and back averaging 16 mpg. With the Chevy I averaged 21. In town now I've been getting 12 mpg. I try to watch the eco light and drive well, but occasionally I step on it. But that's why I got it. I'd like the better fuel economy, but I bought it for performance. This is what I expect a V8 to be.
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  #17  
Old 01-17-2011, 02:19 PM
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Quote:
Originally Posted by Jason Rose View Post
Just to play devils advocate here, but what good does an increace of 1 to 2 mpg's get you if you have to run premium fuel that's 20 cents a gallon more than regular?

haha sooo true
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  #18  
Old 06-07-2011, 08:09 PM
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Quote:
Originally Posted by Jason Rose View Post
Just to play devils advocate here, but what good does an increace of 1 to 2 mpg's get you if you have to run premium fuel that's 20 cents a gallon more than regular?
Glad you asked; if you do the math it works. Rounding down on MadDog's #'s I assumed a 1 mpg increase from 12 to 13 for the city and a 2 mpg increase form 17 to 19 for the highway. I took the prices I saw at the pump here in NY today. $4.09 for regular and $4.29 for the good stuff.

So your fuel costs rise 4.9%

If your city mpg goes from 12-13 you increase your mpg by 8.3% and if your highway mpg goes from 17 to 19 you increase your mpg by 11.8%.

Your not going to retire on that money but depending on mileage it works. If you assume 100,000 miles at equal city and highway you save just over 10% combined, so using the previous prices 100,000 miles without the increase use 6,896.5 gal and costs $28,207. With the increase you use 6,250 gal at a cost of $26,812. You save $1,394 over 100,000 miles. Not a lot but it adds up.

So the moral is if you mod to save mpg don't spend a lot and plan on keeping the truck for a while and the best way to save gas is probably lighten up on the right foot when you don't need the power; that's a free mod.
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  #19  
Old 01-14-2012, 05:10 AM
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Quote:
Originally Posted by booster View Post
From my experience with tunners they are all good and have their pros and cons. The thing is to lay off the gas pedal after you tune the ECM. It's just like when you put an exhaust on your vehicle all you want to do is floor it every where....haha, at least that has been my experince.

One question I do ask is if you find a 2011 dodge ram 5.7 hemi please let me know because I cannot find one for my truck. I have a 2011 ram r/t and I am desparate to get a tunner but they all (tunner oems) say it will not work for the 2011.

Please let me know
I have heard that after 2010 Dodge started to encrypt the OBDII so it would make it harder to change the settings from stock. I may be wrong, but I have heard this.
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