Hemifever CMR tune for Durango 5.7
 

I have a catback, intake and 180 degree thermostat. I ran a best of 15.49@88 MPH with these mods. I bought a Diablosport Trinity and ran the 87 octane tune. 15.31@90 MPH was my best run in the quarter mile. Mileage was down about 1MPG with this tune.

Just loaded up the hemifever 89-octane tune after datalogging my track performance with the 87 octane tune from Diablosport. I'm going to be looking at MPG first and then heading to the track for some comparison.

Hemifever has a good reputation and has been very responsive. My own CMR tuner has been too busy to give a custom tune and didn't think he could do much with 2012 tuning.

I paid full price for this tune and am in no way affiliated with hemifever tuning. I'll give an honest appraisal. Stay tuned :-)

Looking forward to your impressions!

Looking forward as well since Ive never heard of the guy on any of the LX/LC forums.

He's on the jeep forums for sure...

thinking of getting a hemifever tune also but have to wait until the tune is available for the 2013s

So far the hemifever 89 octane tune doesn't feel much different than the 87-octane Diablosport canned tune. Track will show if there is any real gain.

And why not be on the most popular forums with the majority of CMR buyers, ie Ctalk, LXF, etc? CMR is a much different animal than SCT so we will see how the OPs tune is...

Plenty of proven tuners out there though. Johan, Mike @ OST, AJ/hemituner, HHP, Jerseyboy, etc.

Not sure, I havent dealt with him at all just see the threads in the WK2 performance section!

SEAN at Hemifever.com has been around a long time
He has done a lot of work with SCT as well. He is a great person to deal with and really helpful.
He helped me a lot with my Gen 1 Durango Tune
STEVE

Any updates bro?

Track on 5/25 or 5/26

Cool.. I'll stay tuned!!! :icon_dance-disco:

I agree with you and I have had one of the tuners that you have mentioned above tune my Magnum VERY well but have had problems getting him recently to help me out with the D3. So I think I might just give Hemifever a shot. I am looking forward to hearing your results but I'm going with a 92 octane tune. I read on an app this weekend (Drive Dodge) for the D3 that they recommend 89 for the 5.7's. 87 is acceptable but 89 is better. That and Costco only has 87 and 92 : )

13.3 MPG with custom 89 octane tune with mainly city driving (MDS on). Diablo 87 octane canned tune was about the same (MDS off). Stock was 14 something.

Went to the track today. Got a couple runs in with the hemifever 89 octane custom tune.

Best was 15.29 @ 90.12. My best run with the canned 87 octane tune with 5% fuel added was 15.31 @ 90 something. Weight and temperatures were about the same. Basically no appreciable difference at the track.

Got a .000 reaction time today. First time for me.

MPG with the hemifever tune was 13 mixed (mainly city) and 21 MPH highway. With stock tune I was around 14 and 21.

How many miles do you have on the D; where are you in your break-in process? Mine got noticeably better mileage and responsiveness as it broke in, mostly by 10k miles. Variations as small as you are seeing could be attributable to weather and/or break-in if you are still going through it.

12K miles

Should be mostly broken in by then.