5.7 to 6.4 swap in a charger pursuit vvt cam of set help please

[[email protected]]

i got a 392 6.4 hemi i swapped into a 2018 dodge charger pursuit it previously had a 5.7 i got the engine in and running just started messing with hp tuners not long ago and for the life of me im trying to figure out what exhaust tables to off set and how to off set them please don't comment and say ALL EXHAUST TABLES because that is confusing as hell for me if someone can please just high light the ones i need to change in the photo below with details on how to off set it properly i would deeply appreciate the help i am still using the 5.7 ecm at the moment

[LilSick]

you put a 6.4 in a 5.7 car

it now needs to be tuned

i can do that for you but not for free

[[email protected]]

i got 6.4 files and have one copied over to the ecm im just trying to get the vvt off set correctly but if i cant find no help i mat just send the 6.4 ecm out to get un loccked

[[email protected]]

wish i was able to flash the 5.7 ecm with the os of a 6.4 ecm but im assuming it cant be done as i haven't found no information on that either

[Stoopalini]

The exhaust cam VVT tables in the 5.7 operating system need to be offset to work with the 6.4 due to not being able to change the core values in the OS.

There's s thread here somewhere, started by user "Homer", where Hemituna gives a good description on how this works and why.

In short, the 5.7 OS is only going to know cam positions for the 5.7 cam, which is 125 for fully advanced. I know the 6.2 Hellcat cam has a fully advance value of 134, so 9 difference. So to make a 6.2 cam work in a 5.7 OS, you essentially take the cam tables from the 6.2 OS, subtract 9 in every cell of the cam position table, and load it to the 5.7 OS.

For the 6.4, you would do the same (but use the delta between the 5.7 and 6.4 cam fully advance numbers of course), and then update all relevant tables.

[[email protected]]

delta ? and are the boxes u can click on the tables this is the part i get confused at theirs boxes that open tables then theirs numbers in columns idk which to change

[N2speed]

you can either tune it or I can put the 6.4L OS/ Calibration on it if you want to ship it over to me. The 5.7L and 6.4L use the same PCM

[[email protected]]

well i got the stock 6.4 ecm i just cant read it due to vin mis match i was gonna send it out to get unlocked but hp says in there ad tht i need the stock read first

[[email protected]]

or could u tune the 5.7 for me if i sent u the file of course im not asking for free

[N2speed]

I can unlock it as well and I do not need a read of the pcm. I can even change the vin.

[[email protected]]

if i were to send it out this weekend what the turn around time looking like ?

[N2speed]

if i were to send it out this weekend what the turn around time looking like ?

1 day turnaround on my end, shoot me an email for more info. [email protected]

[Party340]

Stock 392 vvt.png

This table is from a stock 392. Now I'm going to subtract 9 degrees to get the offset correct. This is for the WOT cam timing.

VVT offset WOT .png

Do the same thing for all of the exhaust tables. Highlight all of the numbers in the table and type in -9 and hit the + sign.

[[email protected]]

dude thank u so much tht helped me quite a bit so exhaust tables i need to off set are all of these correct ?Screenshot 2025-04-26 131523.png

[Stoopalini]

Don't mess with the CALIBRATED table. It should be the same in both tunes anyway (100 in ever cell except the last one)

The Desired Angle NORMAL table is what is referenced for cam position when WOT is not being commanded, so that's the part throttle cruise cam position table.

The MAX TIP table is only referenced if the functionality is enabled by [ECM] 36059, which should be disabled by default. So you shouldn't have to worry about that table, as it'll never be referenced .... but does no harm in updating it.

The WOT Desired Angle BASE table is what is referenced for the cam position when wide open throttle is being commanded.

The WOT Desired Angle MAX AIRFLOW table I'm not too sure about. I wonder if it's used as an input into the ANN maybe? Not sure, maybe someone else can elaborate.

The Min Desired Angle SCAVENGING table shouldn't need any adjustment, as I believe it is the same for the 5.7 and the 6.4 OEM tune files, but go ahead and check it.

[[email protected]]

thank u for helping make this a little more clear should these be off set as well ?Screenshot 2025-04-26 170721.png

[Stoopalini]

No, I wouldn?t change those. Not sure if they ?should? be changed, but my gut tells me no.

Disclaimer: I?m not a professional tuner, just a hobbyist who has tuned my own vehicle.

[[email protected]]

well u helped me more then anyone els its hard to find information on this and if u do there isnt very much details so someone new like me kinda has there head spin for a bit till someone like u comes along and actually uses the photo reference to help plus im dyslexic and i need more details to help under stand or i start dong things wrong or backwards if any one els in here has more information they wanna share with me to help me better under stand please help out i got way to much money in this swap

[LilSick]

please help out i got way to much money in this swap

skimping on the tune and making all the adjustments yourself should offset some of your expenditures

another great place to save a buck is on connecting rods