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New **Feature** from Dodge for the 23 Hellcats - You cant disable Launch Control...

5.2K views 61 replies 12 participants last post by  hellraff  
#1 ·
At my first track outing a few weeks ago, I kept running into the issue where even not enabling LC, when I would try to foot brake the car up to 1500+ RPM, it would drop into launch control and totally botch the launch.

Happened every time. My LC was set to 1200 and I had never played with it.

Well I spoke to my tuner and he confirmed that this is some new feature dodge put in the cars for at least 23. Maybe 22, not sure. I have heard of this with the TRX as well.

So I found a work around. If you want to foot brake, you can turn up the LC RPM to 2500 (max for mine), and actually enable/activate it as if you are going to use it.

At that point DO NOT go foot to the floor. You need to take the RPMs up slowly to where you want to foot brake from. I find about 1700/1800 is max before you just push through the brakes. You can get there, but you have to do it slow.

If you jump on the gas or go straight to the wood while on the brake, it will just drop into LC and you'll be launching at 2500RPM (unsuccessfully).

So to NOT use LC, you have to use LC...#MakesSense. Turn the RPM all the way up in the menu, then press activate LC. In actual LC with the RPM up that high, it actually ignores that lower RPM limiter/trigger and lets you get past it to where you want to launch from.

Worked for me on the street in testing today. Im getting ready for the track tomorrow.

And before you say "Just use LC", remember that LC shocks the driveline. If you foot brake, you are loading up the driveline with TQ much softer than just hitting it with full tq from nothing. I dont believe Dodge has tuned the LC to assume you might be using drag radials and might hook instantly. Kaboom. I sure hope not, but I'd rather control that driveline shock and minimize it.
 
#7 ·
Funny you should bring this up....

2022RES2: Late in the season I got to 10.018!!!! Could not get it to go better!!!!:mad::mad::mad:

I would foot brake but if I did more than about 1300 it would do the sputtering thing!. Someone called it Torque Reserve.

If I launched with it sputtering, it would be slower. Best times were foot breaking at about 1200 which was max w/o sputter. I could stomp on it and never break traction, but I needed another 0.02sec to get a 9!!! I could not figure out how to get that extra!

I wish I had this info 2 months ago!!!! Now I have to wait until late spring!!!!!

Thanks for the suggestion!!!

Image
 
#13 ·
What kind of air was it you ran in?
24 mph in the back half seams low to me.
Letting off early maybe?
 
#23 ·
Quick note on all this.

1. In "MY" car sport traction control DOES NOT let you do a burnout. My car would NOT even barely spin the tires with sport TC on. I had to FULLY disable the TC by pushing down the brake while stopped, and holding the button for like 5-7 seconds. It would ding and all TC would be OFF.

2. The kicker here is that launch control WILL NOT activate if the TC is off. It needs to be ON, SPORT or TRACK in regards to traction control before you can activate launch control.

This made the process of getting up to the line and during the burnout and getting prestaged a bit fussy and confusing. I would have to start as I rolled up to the burnout box with the TC completely disabled. At which point I could do the burnout.

Then after rolling that out, before I got all the way to prestage, I would turn the TC back on with two presses to get it into sport TC. Even though I was using TRACK MODE, I was using sport TC to make sure the LC worked.

Then as I was rolling up, I would hit activate launch control on the radio and it would be "ENABLED". Again, I was planning on foot braking at 1600-1800, so I had the launch RPM set to 2500.

Once I was staged and ready to go, LC was still enabled and ready. I would instead of standing on the gas hard to kick it in, I would bring the revs up slow. I was able to get to the limit of the brakes with the gas holding at 1600 but not to the floor obv, and when it was go-time, I came off the brake and went WOT.

Worked PERFECTLY. As expected. Its a procedure, but its possible to defeat this new "launch assist" from dodge that prevents you from foot brake launching anything higher than like 1200.

I didnt get a chance to try actual launch control, but maybe next time.
 
#28 ·
Am I missing something? Do you not use Line Lock to warm the tires?

It is going to be a long winter, I'm dying to try your technique but the dragway is closed for the season. :(:(:(

I think If I knew this before, it would made all the difference!
 
#30 ·
Funny you should bring this up....

2022RES2: Late in the season I got to 10.018!!!! Could not get it to go better!!!!:mad::mad::mad:

I would foot brake but if I did more than about 1300 it would do the sputtering thing!. Someone called it Torque Reserve.

If I launched with it sputtering, it would be slower. Best times were foot breaking at about 1200 which was max w/o sputter. I could stomp on it and never break traction, but I needed another 0.02sec to get a 9!!! I could not figure out how to get that extra!

I wish I had this info 2 months ago!!!! Now I have to wait until late spring!!!!!

Thanks for the suggestion!!!

View attachment 641588
Funny you should bring this up....

2022RES2: Late in the season I got to 10.018!!!! Could not get it to go better!!!!:mad::mad::mad:

I would foot brake but if I did more than about 1300 it would do the sputtering thing!. Someone called it Torque Reserve.

If I launched with it sputtering, it would be slower. Best times were foot breaking at about 1200 which was max w/o sputter. I could stomp on it and never break traction, but I needed another 0.02sec to get a 9!!! I could not figure out how to get that extra!

I wish I had this info 2 months ago!!!! Now I have to wait until late spring!!!!!

Thanks for the suggestion!!!

View attachment 641588
When we get back to the track in the spring I can show you how to avoid hitting the Torque Reserve. I tried upping the LC to 2500 and it did not work with the 21 SS but I spent a lot of time sitting in the car just bringing the RPMS up and part if it is actually brake pedal pressure related, on a light pedal with out pushing thru you can bring the RPMS up slow w/o out hitting TR the alternative is with light pressure you can activate the TR by stabbing the break and put it into TR when you want, the key with TR is that it times out after too long and then you end up with a dead pedal when the tree drops, at least that has been my experience with the 21 SS. I managed to squeak out 10.038/133 and that with the Stage 1 kit @840 on Boostane 100 Octane. Little more weight reduction for me and the car and I hope to push a sub 10 run!
 
#31 ·
AH! I knew you had some secrets!!! Your times are incredible! I'd love to see what you could do with a Stage 2! You have all winter! ;)

(For the audience: I asked LM to drive my car at the track but declined. Now I'm thinking LM might have been able to trick it into the 9's!)

What were your times before the S1?
 
#32 · (Edited)
It may have hit 10.5 but was consistent at 10.6/7 full weight with the Hoosiers. Never had the DA like we did this fall. Now running 17MTs, front sway bar and passenger seat removed. Even in the hear this summer it was 10.3 consistent. I spend a lot of time driving that car in my head and it has paid off 10 fold. I’m thankful to be able to swap cars and run the 15 HC and not miss a beat.
 
#33 ·
Last year (Oct23) before the S2 I was 10.6's also, best was 10.617 @127, launch control, DA somewhere around 1000. I think the front seat was removed. S2 appears to take off about 1/2sec, but it is hard to tell as I am a novice at the launch. Seems like the S1 almost does the same for you!

You have great cars, hang on to them!

Can't wait until next season to try what has been suggested in this thread. Also land speed trials, hopefully this time with all injectors working! :)

Thanks for the info!
 
#34 ·
Im getting super frustrated with this launch assist garbage. I'd like to NOT do the TC off/on/LC enable dance at the line when Im trying to focus on just getting the car A to B.

Anyone have any luck killing or defeating the new "feature" dodge gave us with these newer hellcats? I cant stand it. Looks like the TRX folks have it too. Not sure bout the durangos.

Id like to just disable TC all together and be able to foot brake it up past 1100 or so to like 1600-1700 without it dropping into this launch assist.
 
#35 ·
Im getting super frustrated with this launch assist garbage. I'd like to NOT do the TC off/on/LC enable dance at the line when Im trying to focus on just getting the car A to B.

Anyone have any luck killing or defeating the new "feature" dodge gave us with these newer hellcats? I cant stand it. Looks like the TRX folks have it too. Not sure bout the durangos.

Id like to just disable TC all together and be able to foot brake it up past 1100 or so to like 1600-1700 without it dropping into this launch assist.
As my car is not cursed with this and I only was cursed with the 2021 and later COTS issues the only help I can give is with your added power 1100 RPM More than likely is going to be your sweat spot any how. A lot of people get best time leaving off idle. Hope it gets worked out !
 
#37 ·
No way I could launch 1800 RPM's stock.. I have about 860 WHP and 800 to 1000 Works best for me. Just saying. Off idle I do mean load the torque converter but that is it.
Once again best of luck.
 
#38 ·
No way I could launch 1800 RPM's stock.. I have about 860 WHP and 800 to 1000 Works best for me. Just saying. Off idle I do mean load the torque converter but that is it.
Once again best of luck.
I’ll try it. Heading to the track tonight for some negative DA goodness.
 
#41 ·
I agree with CPO. My best runs are leaving at about 1000-1100. It may sound strange but if traction is marginal I leave about 1400-1500.
 
#46 ·
#47 ·
Thats all shes got captain. DA was basiclly -1000. I dont get a lot of seat time and when the weather is this good here in FL, the test and tune nights are busy and also end up with several shut downs for broken cars.

But for my usecase, 10.30 is mighty respectable for a tune only E85 717 hellcat.

Next is going to be a few more supporting mods. Then a pulley or maybe one of them fancy new Kong 2650 blowers...
 
#48 ·
You had a good night. Skinnies and you would have been running 10.2x.

What track was this?

I just checked my slips. Three of my last 4 outings I ran 5-7 runs in good air. The first 2 outings i gave up early as the track went away from cars with street tires. My last outing i got 7 runs in. Someone oiled the whole track down or else I would have got more in, so not bad.

The last outing I was trying out E85 for the first time. Unfortunately my tuner was in an area with little service so I only had 1 revision. Pretty much the same timing as my pump gas tune. So we are sure there is more left. I was going to finally upgrade the stock pulley but now we are curious what we can get out of E85. LOL
As far as the second last outing goes, the car crapped the bed on the first hit and had to be pushed off. Note to self, always check the whole car out after a dealer visit.