Livernois tune installed!!

Idaho392

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Location
Idaho
Current Rides
2021 Rubicon 392, 2021 RAM 1500 Limited
After about a two week process, I now have the Livernois tune installed. I've done several tunes over the years on my various vehicles (BMW, Mercedes), often for much more money, so I do have some experience with the tuning thing. Here is a quick summary of how it works:

1. Order the tune and adapter cable on their website.
2. Wait for them to contact me with an RMA number (1 day)
2. Ship my PCM on a Wednesday via 2nd day air.
3. Received the PCM, tuner and cable back on the following Wednesday.
4. Update the tuner on a PC with the USB cable.
5. Plug tuner into the Jeep so it can download the existing file.
6. Plug tuner back into PC so it can send the file to Livernois.
7. Received email 3 business days later that it was ready.
8. Plug tuner into PC, download tunes.
9. Plug into Jeep and install tune(s). I am running the 91 octane tune.

Was it worth the money?? Absolutely. Does it turn your 392 into a racecar?? Nope. It does make much better use of the power, especially in the midrange. There are several other benefits to the system as well:

1. It eliminates the V4 mode completely, which was starting to drive me nuts after just a month.
2. They supply a transmission tune, which makes the gear shifts much faster (also much more firm, especially 1st to 2nd). This is a separate install file, so not required for the tune itself.
3. The tuner is super easy to use, and the vehicle can be returned to stock in about 5 minutes.

I have not done a mpg comparison, but I'm doubting there is any difference. Feel free to ask any questions.
 
I am running the 91 octane tune.

That is really cool! :)(y) I have been really curious about the Livernois tune, thanks for the run through. About the fuel, l know Livernois can tune some engines to run fuels like E85 for more power here is the Livernois 392 Dyno on YouTube . When you say 91 octane are you able to run Mid-grade gas as opposed to premium or is that just a minimum octane rating?

3. The tuner is super easy to use, and the vehicle can be returned to stock in about 5 minutes.

So I’m looking into the 8yr/100,000mi warranty. If you return it to stock is there any chance the dealer might notice and try and claim the warranty is invalid?
 
In my part of the country, the only octanes available are 85, 87 and 91. They included a 93 octane tune that I could install, and use an octane booster, but I'm not sure it's worth all that extra work. LOL

Warranty claims can be tricky if you have made any engine or computer changes. If they can show the changes are what caused the problem, then you are out of luck on a claim. However, if your spare tire carrier breaks off the back, I'm not sure they could claim it was because you "tuned" the engine. LOL
 
In my part of the country, the only octanes available are 85, 87 and 91. They included a 93 octane tune that I could install, and use an octane booster, but I'm not sure it's worth all that extra work. LOL

Warranty claims can be tricky if you have made any engine or computer changes. If they can show the changes are what caused the problem, then you are out of luck on a claim. However, if your spare tire carrier breaks off the back, I'm not sure they could claim it was because you "tuned" the engine. LOL
The increased g force on launching could tear the spare tire carrier off the back due to your tune :).

Awesome! That will be one of the first things I do when I get the 392. Will talk with livernois and see if they are working on a supercharger upgrade. Probably can use the same tuner.
 
I just installed the 93 tune this week and it's great and the tranny tune is good without being hardcore.
 
After about a two week process, I now have the Livernois tune installed. I've done several tunes over the years on my various vehicles (BMW, Mercedes), often for much more money, so I do have some experience with the tuning thing. Here is a quick summary of how it works:

1. Order the tune and adapter cable on their website.
2. Wait for them to contact me with an RMA number (1 day)
2. Ship my PCM on a Wednesday via 2nd day air.
3. Received the PCM, tuner and cable back on the following Wednesday.
4. Update the tuner on a PC with the USB cable.
5. Plug tuner into the Jeep so it can download the existing file.
6. Plug tuner back into PC so it can send the file to Livernois.
7. Received email 3 business days later that it was ready.
8. Plug tuner into PC, download tunes.
9. Plug into Jeep and install tune(s). I am running the 91 octane tune.

Was it worth the money?? Absolutely. Does it turn your 392 into a racecar?? Nope. It does make much better use of the power, especially in the midrange. There are several other benefits to the system as well:

1. It eliminates the V4 mode completely, which was starting to drive me nuts after just a month.
2. They supply a transmission tune, which makes the gear shifts much faster (also much more firm, especially 1st to 2nd). This is a separate install file, so not required for the tune itself.
3. The tuner is super easy to use, and the vehicle can be returned to stock in about 5 minutes.

I have not done a mpg comparison, but I'm doubting there is any difference. Feel free to ask any questions.
What kind of performance improvements can you expect with the tune? 0-60 time etc. Will 93 octane still give the best performance? Thanks!
 
So I’m looking into the 8yr/100,000mi warranty. If you return it to stock is there any chance the dealer might notice and try and claim the warranty is invalid?

I installed Livernois’ new unlocked PCM and tune on my 19 JLUR 3.6 ESS and it was an incredible improvement especially using E85. The idea was to just reinstall the stock PCM for any warranty issues. Well, that didn’t work since Jeep has a code that is instantly triggered upon the use of any tune other than stock and it’s saved in the BCM so a PCM swap doesn’t remove the P1400 code. A normal reader will not show the code but it is viewable by the dealer, and interestingly enough, the Tazer Mini. The P1400 code states, “aftermarket software detected/power train warranty void.” As much as I enjoyed Livernois tune for the V6, I’m on the fence for the 392 since it seems Jeep is still working some kinks and I don’t want to pay out of pocket for their mistakes just because I have an aftermarket tune that is not the cause of the problem.
 
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I switched to the 93 tune a few days ago, after buying some octane booster to mix with my 91. Even with the 93 tune, the overall horsepower gain is 30hp... so the 0-60 time is probably only improved by .1 or .2 seconds. I would guess the transmission tune (faster shifts) would probably improve the time another .1 or .2 seconds.

As I mentioned originally, the driveability of the Jeep is MUCH improved... the midrange torque and hp gains are most noticeable. The other features are removal of the V4 mode and speed limiter. :)
 
I installed Livernois’ new unlocked PCM and tune on my 19 JLUR 3.6 ESS and it was an incredible improvement especially using E85. The idea was to just reinstall the stock PCM for any warranty issues. Well, that didn’t work since Jeep has a code that is instantly triggered upon the use of any tune other than stock and it’s saved in the BCM so a PCM swap doesn’t remove the P1400 code. A normal reader will not show the code but it is viewable by the dealer, and interestingly enough, the Tazer Mini. The P1400 code states, “aftermarket software detected/power train warranty void.” As much as I enjoyed Livernois tune for the V6, I’m on the fence for the 392 since it seems Jeep is still working some kinks and I don’t want to pay out of pocket for their mistakes just because I have an aftermarket tune that is not the cause of the problem.
A little bit back Diablo resolved this with their PCM's, if you order a spare PCM from them they claim to have resolved the P1400 code from showing up in the BCM. But FCA can make a change to put an end to this too. If you do get flagged You don't lose necessarily lose your powertrain warranty but The P1400 flag means no dealer can do any powertrain warranty work without a regional technical engineer's approval.
 
After about a two week process, I now have the Livernois tune installed. I've done several tunes over the years on my various vehicles (BMW, Mercedes), often for much more money, so I do have some experience with the tuning thing. Here is a quick summary of how it works:

1. Order the tune and adapter cable on their website.
2. Wait for them to contact me with an RMA number (1 day)
2. Ship my PCM on a Wednesday via 2nd day air.
3. Received the PCM, tuner and cable back on the following Wednesday.
4. Update the tuner on a PC with the USB cable.
5. Plug tuner into the Jeep so it can download the existing file.
6. Plug tuner back into PC so it can send the file to Livernois.
7. Received email 3 business days later that it was ready.
8. Plug tuner into PC, download tunes.
9. Plug into Jeep and install tune(s). I am running the 91 octane tune.

Was it worth the money?? Absolutely. Does it turn your 392 into a racecar?? Nope. It does make much better use of the power, especially in the midrange. There are several other benefits to the system as well:

1. It eliminates the V4 mode completely, which was starting to drive me nuts after just a month.
2. They supply a transmission tune, which makes the gear shifts much faster (also much more firm, especially 1st to 2nd). This is a separate install file, so not required for the tune itself.
3. The tuner is super easy to use, and the vehicle can be returned to stock in about 5 minutes.

I have not done a mpg comparison, but I'm doubting there is any difference. Feel free to ask any questions.
When you say the 4cyl mode was driving you nuts, was it due to the exhaust change when going into 4cyl mode? I hate that on my 392 so I'd install this just to be rid of that sound regardless of the other benefits.
 
Interesting thread. For me, a 30 hp gain is probably not worth it. With other cars various companies make piggyback controllers which may solve some of these issues – Burger motorsports and RaceChip for example. With a stock N/A motor, there are really just too many limitations. The Forced Induction motors can usually yield more significant gains and still stay within the safe zone.
 
When you say the 4cyl mode was driving you nuts, was it due to the exhaust change when going into 4cyl mode? I hate that on my 392 so I'd install this just to be rid of that sound regardless of the other benefits.
I have yet to pull the OEM calibration off the Wrangler 392 PCM, but here is a 19 scat pack, and SRT GC

The OEM MDS system is set only to work between 9-43mph only. The SRT Grand Cherokee is between 10-45mph. - The 392 engine calibration seems to be nearly the same for each platform (minus speed limiter).

Also above oil temp 176 degrees the MDS will not turn on if above 3,000 RPM.
max.JPG
MDS.JPG
 
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When you say the 4cyl mode was driving you nuts, was it due to the exhaust change when going into 4cyl mode? I hate that on my 392 so I'd install this just to be rid of that sound regardless of the other benefits.
Yes, the exhaust "drone" in 4 cylinder mode was crazy... and every person that ever rode in it said something about it.
 
I have yet to pull the OEM calibration off the Wrangler 392 PCM, but here is a 19 scat pack, and SRT GC

The OEM MDS system is set only to work between 9-43mph only. The SRT Grand Cherokee is between 10-45mph. - The 392 engine calibration seems to be nearly the same for each platform (minus speed limiter).

Also above oil temp 176 degrees the MDS will not turn on if above 3,000 RPM.
View attachment 2220View attachment 2221

I just installed my new ECM from HPTuners and was able to flash my tune/changes. I opted to buy another ECM to avoid warranty issues. After installing the new ECM I noticed the P1400 code. I cleared codes multiple times and it didn’t go away. After researching this I realized what the code means and that there is a workaround, we’ll sort of. With HPTuners I can turn of the P1400 code so it won’t show up when you scan the ecm. But the problem with that is 1. If I put my original ECM back in for warranty work it will show the same P1400 code and it hasn’t been modified by HPTuners so I can’t flash it to hide the code. 2. If true the code is stored in a body control module then the dealer will most likely see it whether I have the modified ECM installed or the original. The whole reason I bought the new ECM was to avoid any warranty issues and HPTuners should disclose this information about the P1400 code so that other people like myself know.

To answer your question about the MDS enable and disable speeds it was from 11 mph to 82 mph. Quite a bit higher than the 392 in the cars.

I will keep playing with the tunes etc and read the BCM’s with JSCAN to figure out a solution if one is possible. First I want to see if the code is present in the BCM given I disabled it in the tuning.

I will say it was worth it! I love that the MDS is off now. I also adjusted the electric fans to come on earlier. What temps do your Jeeps run at? Mine is always north of 200. At slow speeds on a trail etc it gets to 220. Having built and owned numerous LS engines that seems really hot.
 
I switched to the 93 tune a few days ago, after buying some octane booster to mix with my 91. Even with the 93 tune, the overall horsepower gain is 30hp... so the 0-60 time is probably only improved by .1 or .2 seconds. I would guess the transmission tune (faster shifts) would probably improve the time another .1 or .2 seconds.

As I mentioned originally, the driveability of the Jeep is MUCH improved... the midrange torque and hp gains are most noticeable. The other features are removal of the V4 mode and speed limiter. :)

I wish you lived closer so I could read your tune with HPTuners! I’d like to know what they changed.
 
I just installed my new ECM from HPTuners and was able to flash my tune/changes. I opted to buy another ECM to avoid warranty issues. After installing the new ECM I noticed the P1400 code. I cleared codes multiple times and it didn’t go away. After researching this I realized what the code means and that there is a workaround, we’ll sort of. With HPTuners I can turn of the P1400 code so it won’t show up when you scan the ecm. But the problem with that is 1. If I put my original ECM back in for warranty work it will show the same P1400 code and it hasn’t been modified by HPTuners so I can’t flash it to hide the code. 2. If true the code is stored in a body control module then the dealer will most likely see it whether I have the modified ECM installed or the original. The whole reason I bought the new ECM was to avoid any warranty issues and HPTuners should disclose this information about the P1400 code so that other people like myself know.

To answer your question about the MDS enable and disable speeds it was from 11 mph to 82 mph. Quite a bit higher than the 392 in the cars.

I will keep playing with the tunes etc and read the BCM’s with JSCAN to figure out a solution if one is possible. First I want to see if the code is present in the BCM given I disabled it in the tuning.

I will say it was worth it! I love that the MDS is off now. I also adjusted the electric fans to come on earlier. What temps do your Jeeps run at? Mine is always north of 200. At slow speeds on a trail etc it gets to 220. Having built and owned numerous LS engines that seems really hot.
Does HPtuners give you a tune that gets rid of the torque dip (like the livernois tune) and increase power?
Does it do a transmission tune (firmer shifts, etc).

I like the idea that I can tinker with fan temps and such but would like to have a good base tune to start from.
 
Did you replace the thermostat or just run the cooling fans harder and earlier ?
 
Did you replace the thermostat or just run the cooling fans harder and earlier ?
I see people talk about replacing the thermostat with a 180. This has been tried with every model wrangler for the last 10 years. It does nothing. As mentioned the 392 will still run at 220 with the 203 t-stat. This means is still gets hotter after the t-stat is fully open. So the 180 is going to do the same thing just sooner. And you get the benefit of throwing a t-stat failure code because the Ecm is wanting 203 pretty quick after start up.

only thing that helps with the higher temps is the hptuners change to fan settings. And then your fan runs a lot a lot…. Fought high temps in my JKUR forever and lost…. lots of experience here. That is why it is gone. I can deal with 220, couldn’t deal with 240…
 
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