Dodge Challenger Forum banner

1 - 14 of 14 Posts

·
Registered
Joined
·
238 Posts
Discussion Starter #1
Has anyone heard anything about getting the stock ECU unlocked. A friend said that Diablo had done it and that the stock ECU then becomes programmable.
 

·
Registered
2016 Scat Pack Shaker
Joined
·
756 Posts
Diablo, HP Tuners and probably others can unlock the PCM for tuning with their software. Make sure you understand how tuning takes place and what other hardware/software is required before you move forward. Most folks opt to purchase an unlocked PCM and retain the stock one for back up, warranty, etc.
 
  • Like
Reactions: PaVaSteeler

·
Registered
Joined
·
6,575 Posts
I have a my stock PCM sitting on a shelf, I had a Scat pack 1 PCM installed in my 2015 R/T. I keep thinking about getting it done, but tuning for some reason makes me nervous, like afraid I will "brick" my car.
 

·
Registered
Joined
·
238 Posts
Discussion Starter #4
Does unlocking your stock ECU or even getting a race ECU kill your warranty. I want to change the exhaust on my 2018 Hellcat and remove the Cats, that will require unlocking the ECU to override the o2 sensor. will Chrysler find out
 

·
Registered
2016 Scat Pack Shaker
Joined
·
756 Posts
I have a my stock PCM sitting on a shelf, I had a Scat pack 1 PCM installed in my 2015 R/T. I keep thinking about getting it done, but tuning for some reason makes me nervous, like afraid I will "brick" my car.
I know exactly what you mean, that is why I went with Diablo and a remote tuner. I really wanted to go with a more hands on solution but after months of studying realized that I had neither the knowledge or skill to tune my own vehicle. Hope to get there someday. I have a lot of respect for board members that tune their own cars.
 

·
Registered
2019 Challenger 1320
Joined
·
2,236 Posts
Have you heard the phrase "Penny wise, pound foolish?"

That applies to your PCM. You might "save" money having your OEM PCM unlocked, but you're setting yourself up for trouble and expenses down the road.

Why? Because many dealers flash the PCMs when the car is brought in for service. If you unlock your OEM PCM and have a tune installed, when the Dealer flashes that PCM (1) they'll over-write that tune and if you don't have it saved you've lost it and the money you spent on it, and (2) the dealer will read that your PCM has been unlocked; this could (will) lead to warranty issues down the road.

IF you are interested in getting a tune, you're far better off buying an already unlocked PCM from HP Tuners or Diablo Sports, and only swap it out with your OEM PCM when you take your car in for service (takes 20 minutes max).

Strange things can happen to a PCM that's flashed by the dealer; if they "brick" your unlocked OEM PCM, they'll most likely deny culpability because it was unlocked, and you'll be stuck at the dealer with a very expensive paper weight (your car) unless you pay the dealer to replace the PCM....IF they have one in stock.

Bite the bullet and buy a second PCM that is unlocked by the tuner of your choice...it's worth the piece of mind.
 

·
Registered
2009 Challenger SRT8
Joined
·
143 Posts
Good Idea. I put catless on and used Bigdaddys mini-cats that screw in under the rear o2 sensors and it never coded. They are the answer to that problem. BUT, I tried all last summer to verify a gain from the catless and an LMI on a stocker and I ended up breaking about even with a 10.89 in around 1800-2000ft air. Went back to all stock and then went a couple 10.85's and a 10.84. I suspect on a stocker the catalytic back pressure may somehow work in conjunction with the camshaft overlap period preventing some boosted intake charge from escaping. Just speculation but it is the only thing I can come up with that makes any sense. The LMI sounded cool and looks great and may work on a big HP setup but again I gained 0 in quite a few runs with it on a stock setup. It is a nice piece tho with potential in other applications I would think.
 

·
Registered
Joined
·
238 Posts
Discussion Starter #9
Getting rid of the cats isn't about HP gains as i know that the current cats flow very very well. It's about noise level. The cats remove a few Decibels for the exhaust note and I like my cars to sound loud. My Ideal setup would be like my other cars and truck, long tube headers no cats and twin AtAt 2.5 Aero Turbine mufflers straight out to 5" tips. However I feel this would kill my warranty, so i am gonna hold off for a while
 

·
Registered
Joined
·
6,575 Posts
Have you heard the phrase "Penny wise, pound foolish?"

That applies to your PCM. You might "save" money having your OEM PCM unlocked, but you're setting yourself up for trouble and expenses down the road.

Why? Because many dealers flash the PCMs when the car is brought in for service. If you unlock your OEM PCM and have a tune installed, when the Dealer flashes that PCM (1) they'll over-write that tune and if you don't have it saved you've lost it and the money you spent on it, and (2) the dealer will read that your PCM has been unlocked; this could (will) lead to warranty issues down the road.

IF you are interested in getting a tune, you're far better off buying an already unlocked PCM from HP Tuners or Diablo Sports, and only swap it out with your OEM PCM when you take your car in for service (takes 20 minutes max).

Strange things can happen to a PCM that's flashed by the dealer; if they "brick" your unlocked OEM PCM, they'll most likely deny culpability because it was unlocked, and you'll be stuck at the dealer with a very expensive paper weight (your car) unless you pay the dealer to replace the PCM....IF they have one in stock.

Bite the bullet and buy a second PCM that is unlocked by the tuner of your choice...it's worth the piece of mind.
If I did my stock PCM I would still have my unaltered Scat Pack 1 PCM and the dealer can NOT flash that...
 

·
Registered
2009 Challenger SRT8
Joined
·
143 Posts
Getting rid of the cats isn't about HP gains as i know that the current cats flow very very well. It's about noise level. The cats remove a few Decibels for the exhaust note and I like my cars to sound loud. My Ideal setup would be like my other cars and truck, long tube headers no cats and twin AtAt 2.5 Aero Turbine mufflers straight out to 5" tips. However I feel this would kill my warranty, so i am gonna hold off for a while
Mine without cats was fine at hwy speeds and was noticeably louder around town, sounded pretty good. You would probably like it I am guessing. But, in the morning at 7 am it would wake the dead so I had to keep the garage door down and start it, it was frickin loud. I had to wait a few for it to idle down some, open the door and scoot out of the subdivision knowing I woke a few people up. Probably would be the biggest bang for the buck to do with the mini-cats from Bigdaddys and leave the nice, factory exhaust system intact. Long tube headers would be of no use as far as sound if going catless, and they don't produce any power gains on a stocker or even some 9 sec cars like Lindas, so save your money there..
No PCM changes needed, the PCM would never know the difference with the mini cats in there I suspect. No service engine lights came on. If you like the catless sound, you might like the LMI intake as well. The supercharger whine can be intoxicating but i am over it personally.
 

·
Registered
2009 Challenger SRT8
Joined
·
143 Posts
Cool :)
 

·
Registered
Joined
·
10 Posts
I know how loud it can get. I have included a pic of the exhaust systems on my other cars and truck. Like you said it can wake the dead.

I had to chuckle.... many years ago the Y pipe flanges broke on my little 69 318. Had to remove to weld em up at work, but still had to get to work. So I aluminum foiled anything important near the output of the exhaust manifolds (like starter cables..). Geese talk about LOUD plus I had to back out of the driveway at 6 am and climb a 1/4 mile long grade. I am sure my neighbors loved me. (smile).


But the loudest engine I've ever heard was an Alison V12 set up at EAA's airshow on a dyno... some where around 1700 cubic inches, little 5" long shorties one on each of the 12 cylinders... he'd work it to 100% power and take off rpm on the dyno.... Now that was LOUD.... I mean seriously LOUD! Likely 120 Decibles or ???... But it was sweetest sounding engine I've ever heard! (Yea you have to be an engine guy to appreciate it)
 
1 - 14 of 14 Posts
Top