engine mods
- Thread starter rich1946
- Start date
- Mar 23, 2021
- 138
- 301
- Current Rides
- 2021 Rubicon392, 2015 JK Willys Edition, 2014 RAM 1500 Limited, 2009 Dodge Challenger SRT8
HPTuners MPVI2 will probably do it. Their web site does not specifically tell you everything it can do, so I sent a request to them for a call back to answer my questions. Ryan called me the next day and told me the MPVI2 can access and reprogram the top speed limiter. I did not ask about the 4 cylinder drop off as I was unaware of this until I saw your message. It will probably be able to reprogram that also.
The HPTuners is expensive at $680 to acquire all that is needed for your 392. A follow-up email from Ryan: Your 2021 Jeep will require a MPVi2, PCM mod ( or new PCM), 2 engine credits, smart access cable and 4 transmission credits.
The credits are really a software license fee to HPTuners that enables you get past the built in security of the PCM (Powertrain Control Module) and ECM (Engine Control Module).
After talking with Ryan it occurred to me that reprogramming these items could void the warranty. It will be detectable by the dealer unless you restore the original settings before taking it in for service every time. I don't know this as a fact, but it is a concern I have.
I am thinking for now that I may just purchase a Tazer JL Mini (~$329) programmer to handle the tire size change and other items that do not impact the warranty. I am still researching this.... Anyone else have information on this?
The HPTuners is expensive at $680 to acquire all that is needed for your 392. A follow-up email from Ryan: Your 2021 Jeep will require a MPVi2, PCM mod ( or new PCM), 2 engine credits, smart access cable and 4 transmission credits.
The credits are really a software license fee to HPTuners that enables you get past the built in security of the PCM (Powertrain Control Module) and ECM (Engine Control Module).
After talking with Ryan it occurred to me that reprogramming these items could void the warranty. It will be detectable by the dealer unless you restore the original settings before taking it in for service every time. I don't know this as a fact, but it is a concern I have.
I am thinking for now that I may just purchase a Tazer JL Mini (~$329) programmer to handle the tire size change and other items that do not impact the warranty. I am still researching this.... Anyone else have information on this?
I got tazer coming on Monday... will let you know
I believe you are correct that the reprogramming will void the warranty and that dealerships will be able to detect it unless restored to the original settings like you said.
Not 100% sure, but it is my understanding that dealers can access all history even if you reset to original settings. Of course they would have to go through the history but sometimes they do just to make sure mods to PCM or ECM were not made. The only way would be to have two PCMs and two ECMs, one modified and the original/unmodified one.
- Thread starter
- #6
How can I say thankyou enough. You guys did a lot of research for me. I also did some research at the dealer. They will not perform any performance mods, and anything that is done will be detected and cause warranty issues. As far as the 4 cylinder cutoff at cruise, I think that can be accomplished at the dealer without any issues. They are checking into that as we speak. I will update the info when I hear from Them. Thanks again to all who chimed in. I believe this forum is amazing.
Hey thanks a bunch for confirming with your dealership. I suspected they would detect anything done, and deny warranty because of it. I’m guessing that goes for any Tazer mods for larger wheels as well.
The thing is a beast stock from the factory. I’m personally going to leave things alone on it. Don’t think I’d ever want or need to go over 100 in a Wrangler. Larger tires would be nice at some point.
I agree @Maxx. I will also leave this without major mods to the power train during the duration of the warranty. I will wheel and see what I can do with it in stock form and get a pretty good idea of any need for improvement/upgrade. Once that warranty is over, I may explore a few options.
- Thread starter
- #9
I heard back from the service manager, and I quote: Any modification could void that portion of the warranty. We talked in length and he said all mods would be reviewed by the factory if a warranty claim is made. Caution to the wind.
I disagree. The PCM does not store older versions of the settings, it only contains the current settings. The dealership will be able to detect settings that are out of spec, but won't know if those settings were out of spec, but were returned to spec before they saw it. However, the HPTuners product is a very high-end performance tuner and monitor, typically used by folks building and operating in competitive situations. It is not something I would recommend for someone who doesn't really know what they're doing and have a really good reason to do it. And the cost point, I don't think, justifies the purchase just to remove the speed limit. Just my $0.02 worth.
Just take it to a local shop that uses HPTuners and pay for their time and credits to change the setting if you want it raised higher.
Pretty much anyone with a dyno probably has the equipment and knowledge already to make minor adjustments like this and tire size.
Pretty much anyone with a dyno probably has the equipment and knowledge already to make minor adjustments like this and tire size.
Pedal Commander | Throttle Response Controller | PC78 Bluetooth
PC78 is the only performance upgrade you'll ever need! You can remove throttle lag safely with PC78 and double the fun. Try PC78 now!
pedalcommander.com
get one of those and I can assure you that you will. be so happy you won't do another thing to your 392.
in line mods are not traceable, like this one or the edge pulsar for example. now any mod that changes the engine in a way that it exceeds the spec could raise a red flag but only if they dig deep in the black box and the number might show on an ecu report but the equipment will be gone so they will be scratching their heads. they only do that when there is major warranty money involved.
If you set the pedal commander to a reasonable setting you will see a huge difference but if you try to run it over 80% of what it can deliver you might start breaking shit. It is very aggressive, very loud, very fun, very head turning, and very easy to turn down on the fly and remove from the Jeep when you go in for service.
and do yourselves a favor, if you like to talk about your 392 and how bad ass it is and you are thinking of doing this or that to it have that conversation on here or at a bar. don't have those conversations with service advisors, you are only giving them the ammo to then shoot you with one day.
I can assure you that you can't run the pedal commander listed above at its highest setting and 3/4 setting will probably cause a couple guys on here to have to change their underwear after their first drive.
| LPP621162 | Livernois Motorsports
LIVERNOIS MOTORSPORTS 2021 JEEP WRANGLER 392 RUBICON 6.4L TUNER WITH PCM UNLOCK
www.livernoismotorsports.com
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