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  #13  
Old 11-30-2014, 11:20 PM
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Re: Another Hemi Gas-Mileage Thread

Just got my '05 WK Hemi, first tank was 13.5 mpg, 3rd tank 87 octane w/ 10%ethanol improved to 16mpg on interstate 75mph road trip. (My '05 Magnum used to get 18, 2wd & mashing the go pedal frequently, could get 22-24mpg hwy)
Thinking spark plugs & a CAI may help 1-2mpg each
Also contemplating a diablo predator or trinity 1000

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  #14  
Old 11-30-2014, 11:33 PM
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Quote:
Originally Posted by aj3511 View Post
Just got my '05 WK Hemi, first tank was 13.5 mpg, 3rd tank 87 octane w/ 10%ethanol improved to 16mpg on interstate 75mph road trip. (My '05 Magnum used to get 18, 2wd & mashing the go pedal frequently, could get 22-24mpg hwy)
Thinking spark plugs & a CAI may help 1-2mpg each
Also contemplating a diablo predator or trinity 1000
Dont compare it to a 2wd.. you have an Awd. Spark plugs will help if the tips are gone. I was getting around 16ish too when my spark plug tips were gone. Cai won't help too much with the mpg but hey the noise is nice!
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  #15  
Old 12-01-2014, 08:04 AM
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Re: Another Hemi Gas-Mileage Thread

I saw a video last eve recommending OEM spark plugs, as the higher spark & fancy tip ones don't help in a 5.7L, agree?
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  #16  
Old 12-01-2014, 03:37 PM
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Re: Another Hemi Gas-Mileage Thread

Quote:
Originally Posted by aj3511 View Post
I saw a video last eve recommending OEM spark plugs, as the higher spark & fancy tip ones don't help in a 5.7L, agree?
This is true. If your ignition system is stock, run nothing but a good quality copper core plug gapped at .043-.045 in. I run nothing but NGK's in both my Hemi vehicles. I am in the process of changing my 05 over to the 06 and later ignition setup (SOS coils, 06> valve covers and coil plug change), and I am going to try NGK platinum plugs gapped at .060 in. I run the same setup on my WK, except with copper core plugs gapped at .060 in.

If you have an 05 Hemi Magnum like I do, and are only getting 18 mpg highway, you've got something very wrong or you drive at full throttle all the time. My 05 Hemi Magnum, modded the same as my Hemi WK (see signature) routinely gets 27-29 mpg, driving between 65-70 mpg. A tank of gas in it will go ~450-520 miles. The best I've gotten out of the WK so far is 24.4 mpg (usually 22-23 mpg). The wife won't let me run it down until the low fuel light comes on, and the farthest I've gone on a tank in it is 408 miles.

Edit: Do the Superchips Tuner with the Advanced Transmission Tuning App. for the WK and one of the Diablosport Tuners for the Hemi Magnum. I have both tuners for both of my vehicles. A CAI won't do much except at WOT. It'll make more noise (aftermarket ones), that many people equate to more power. Power gain is minimal, fuel economy increase, if any, is minimal. I recommend you modify the stock setup, and it'll be more than adequate on both vehicles.
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  #17  
Old 12-01-2014, 08:52 PM
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Another Hemi Gas-Mileage Thread

By modify stock setup you mean get a super chips tuner & leave all else stock, no CAI, etc? Or at least tune first & mod later? 24mpg in a WK? That's amazing! Does the SC come with WK specific tunes?

I found a used Diablo Predator 7137 for $150 if that'd work on WK, that's what it's been used on

Thank you for the excellent response !
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  #18  
Old 12-02-2014, 07:58 PM
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Re: Another Hemi Gas-Mileage Thread

I was talking about the stock intake setup. On the WK, unless you're going to do some heavy modding, just add a low restriction filter (like a K and N), and replace the intake tube between the airbox and throttle body with an Airaid Jr. or an SRT tube. That will be more than adequate for the WK. The big choke point in any of the Hemi's (actually all Chrysler engines) are the log style exhaust manifolds. Take the $$$ you were going to spend on a CAI and pick up a tuner....the Superchips with the ATT App., IMO, is better on the WK, and the Diablosport has more flexibility for the LX.

Yes, the SC Tuner for the WK comes with several canned tunes. IMO, it is only superior to the DS Tuner because of the ATT App. If you're not going to get that, then the DS Tuner is fine. The DS 7137 is the one I have for my WK. If you buy it, make sure it's not linked to another vehicle, as they will only work on one vehicle at a time. If it's linked to another vehicle, it'll cost you about $100 to get it reset by the DS folks. If it's been reporte stolen (to the DS folks) you won't get it back. Otherwise it'll just be a paper weight for you.
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  #19  
Old 12-02-2014, 08:21 PM
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Re: Another Hemi Gas-Mileage Thread

http://m.autoanything.com/performanc...ash-jeep-tuner
This one allows trans shift point adjustments & 'seems' top of the line Super Chips tuner with specific WK 5.7L tunes
The Airaid jr is $171
http://m.autoanything.com/air-intakes/airaid-jr-kits
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  #20  
Old 12-02-2014, 08:24 PM
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Re: Another Hemi Gas-Mileage Thread

An Airaid Jr & filter looks to be $172
The SuperChips Trail Dash Jeep Tuner allows trans shift point settings but I've not found a model with ATT app that works for anything but a WK2?
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  #21  
Old 12-02-2014, 08:27 PM
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Quote:
Originally Posted by jeepgcoman View Post
I was talking about the stock intake setup. On the WK, unless you're going to do some heavy modding, just add a low restriction filter (like a K and N), and replace the intake tube between the airbox and throttle body with an Airaid Jr. or an SRT tube. That will be more than adequate for the WK. The big choke point in any of the Hemi's (actually all Chrysler engines) are the log style exhaust manifolds. Take the $$$ you were going to spend on a CAI and pick up a tuner....the Superchips with the ATT App., IMO, is better on the WK, and the Diablosport has more flexibility for the LX.

Yes, the SC Tuner for the WK comes with several canned tunes. IMO, it is only superior to the DS Tuner because of the ATT App. If you're not going to get that, then the DS Tuner is fine. The DS 7137 is the one I have for my WK. If you buy it, make sure it's not linked to another vehicle, as they will only work on one vehicle at a time. If it's linked to another vehicle, it'll cost you about $100 to get it reset by the DS folks. If it's been reporte stolen (to the DS folks) you won't get it back. Otherwise it'll just be a paper weight for you.
SC only does can tunes though.. where the Diablo allows custom.. so diablo over SC for me. I totally agree with the logs being a total clog. I cant remember how was my jeep before i switched them now. Will only get better when i had more mods too!
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  #22  
Old 12-03-2014, 04:03 PM
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Re: Another Hemi Gas-Mileage Thread

That's why I told him to do the SC UNLESS he's going to do some heavy modding. If you're going to go racing, then the DS is better. The DS also does not allow full adjustment and control of the transmission like the SC does. That's the only reason I run the SC with the ATT App. on my moderately modified rig.

You did away with your stock 5.7 log manifolds??? What did you put on??
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  #23  
Old 12-03-2014, 04:54 PM
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Quote:
Originally Posted by jeepgcoman View Post
That's why I told him to do the SC UNLESS he's going to do some heavy modding. If you're going to go racing, then the DS is better. The DS also does not allow full adjustment and control of the transmission like the SC does. That's the only reason I run the SC with the ATT App. on my moderately modified rig.

You did away with your stock 5.7 log manifolds??? What did you put on??
Ya true not everyone is going balls deep into mods haha .. 6.1 obx LTs.. b**** and a half to install but gotta love them. I need a new muffler for a dual in and my mids fixed but shes sounds great even with the bad mids.
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  #24  
Old 12-03-2014, 07:52 PM
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Re: Another Hemi Gas-Mileage Thread

Can you list the SC model that has this ATT app or is the SC TrailDash Jeep tuner the one I want? It allows shift point adjustments. I won't be getting heavy into mods as the Jeep is my winter car while my CTS-V wagon hibernates. That's my mod vehicle when I decide I need more than 556hp . Just want the Jeep to get better than 14mpg & haul while doing so. I'm impressed by current throttle response so tweaking the tune will be even better
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