Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L? - Jeep Garage - Jeep Forum

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Old 08-26-2015, 05:55 PM
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Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

My bumper to bumper expires in November, but powertrain still has another 2 years. I come from fast cars. Last vehicle was an 09 CTS-V with 720hp, not sure why I sold it....

I've always sworn by actual dyne-tuning vs. anything mail order, but the reviews from some of the hemi-fever stuff seem to be worthwhile. It appears he's willing to make tweaks as needed. As long as the customer service is there, I'm willing to try it.

It sounds like you order a diablo tuner and then he will load or send a program file to load onto the device and then flash it into your car?

The only thing I really plan on doing to this vehicle is maybe a CAI. I won't put headers or a cat-back on this vehicle, but if I can get a nice power increase and a shifting performance increase that would be a plus. Going from 365 factory to close to 400 would be nice.

Long term plan is to sell for an SRT, but that might be a couple years.

Thanks for any input.

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Old 08-26-2015, 06:06 PM
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Re: Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

I've had a Hemifever tune on my 2013 JGC 5.7 and my 2013 Ram 1500 5.7 since the month after I bought them. Just take the tune off the vehicles prior to taking them in to the dealership for maintenance or recalls and I've never had any issues with the dealership. I even have Hemifever decals on the back window of both vehicles.


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Old 08-26-2015, 06:18 PM
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Re: Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

Is the price and performance worth the upgrade?

Power increase, shift performance?

Thanks
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Old 08-26-2015, 06:24 PM
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Re: Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

For my wife and I yes but, both vehicles also have AFE CAIs, custom exhausts and other mods AND we are both lead foots. YMMV


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Old 08-26-2015, 09:21 PM
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Re: Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

Cool. I'll have to do a little more research. I like the fact that you can go back to a factory flash if you need to bring it in for work.
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Old 09-03-2015, 01:26 AM
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Re: Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

Quote:
Originally Posted by FFBOS View Post
My bumper to bumper expires in November, but powertrain still has another 2 years. I come from fast cars. Last vehicle was an 09 CTS-V with 720hp, not sure why I sold it....

I've always sworn by actual dyne-tuning vs. anything mail order, but the reviews from some of the hemi-fever stuff seem to be worthwhile. It appears he's willing to make tweaks as needed. As long as the customer service is there, I'm willing to try it.

It sounds like you order a diablo tuner and then he will load or send a program file to load onto the device and then flash it into your car?

The only thing I really plan on doing to this vehicle is maybe a CAI. I won't put headers or a cat-back on this vehicle, but if I can get a nice power increase and a shifting performance increase that would be a plus. Going from 365 factory to close to 400 would be nice.

Long term plan is to sell for an SRT, but that might be a couple years.

Thanks for any input.
I have the Hemifever tuning on my 2011 Hemi and love it. In fact I had to restore the stock tune 2 days ago to get some service done and couldn't wait to get home to upload the HF tune. Easy and simple process.

Sean with Hemifever is awesome. You'll get the tuner and he will have you log certain data points. You then send all this back to him and he modifies the tunes and sends you an adjusted tune for your specific vehicle. Great customer service, and if you're going to get a tuner I don't know why someone wouldn't use HF.
One of the biggest improvements I've noticed with the HF tunes is throttle response is much better now.

I've had my tune in my Jeep for 3 years now and haven't had any issues and just rolled over 81k miles today. would absolutely recommend it.


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Old 09-28-2015, 09:51 AM
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Re: Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

I've had a tune before on my '05 mustang and there were definitely improvements in performance. But the mustang didn't have a "sport" mode.

My question - Does the hemifever tune make the Jeep faster (0-60) than it would already be in sport mode? Thanks
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Old 11-04-2015, 12:21 PM
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Re: Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

HF tune was the best mod i've done to date. IMO with the HF tune standard mode with traction control off is better/faster than sport mode.
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Old 11-09-2015, 05:47 PM
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Re: Anyone do a hemifever tune to their 2012 Grand Cherokee 5.7L?

The Hemifever tune works great on my 2012 and they have you send in your factory settings with mods and will custom tune your 5.7. There is both a 85 and 92 octane tune and I like the performance with the 92 tune. I have several mods including Corsa Cat Back, larger throttle body, thermostat upgrade, CAI with Morosso Catch Can as well as suspension upgrades
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