Tuning Help 2014 Charger RT AWD

[[email protected]]

Hello, I was wondering if anyone has ever experienced anything like this before. We have loaded several tunes on my car through HP tuners and even though the tune seems to load fine and the car runs fine. However, the information we see while the HP dongle is hooked up is completely different than what the tuner himself sees in the data log. For example, while plugged in and the engine running, we can see variation in camshaft movement tables and we see that permanent codes for MDS are no longer there.

However, when we data log that exact tune.. the data log shows none of that and shows that the permanent codes for MDS are still active and that there is no movement in the cam tables. We have tried multiple different VVT limiters as well and there is now the comp cam vvt limiter installed so there should be movement in the VVT mechanically. This is leading us to believe that there could possibly be an issue with the PCM. Currently my emissions monitors ready incomplete and after about 50-75 miles of driving now they will not complete. When my tuner goes to adjust the camshaft he is trying to adjust it to a more advanced state but according to the data log nothing is happening and the cam seems like it?s stuck in a retarded state. Any help or advice would be greatly appreciated. Thanks!

[Stoopalini]

The VVT system works by way of a spring pushing against the phaser, and moving the cam to the fully advanced position as the default resting position. So with key on, engine off ... you should see the cam position being at full advance (125 most likely). When the engine is running, the PCM controls a valve to allow oil to flow into the phaser building pressure to overcome the spring, and retard the cam. The limiter type devices are typically a small metal block which inserts into the phaser, thus physically limiting how much the cam can be retarded by the PCM even though the PCM doesn't know a limiter has been installed.

I do not believe the PCM even knows the actual position of the cam at all, but reports out what position is being commanded by the PCM. So when you put a phase limiter in, you can still see cam position being reported in HPT as something which is beyond what the phase limiter allows ... I'm not 100% confident of this understanding though, so do some research and verify 1st.

Here's a good video explaining the VVT system:

https://www.youtube.com/watch?v=cPuwi3cFJMA

[LilSick]

"However, the information we see while the HP dongle is hooked up is completely different than what the tuner himself sees in the data log."




are you suggesting that the data is different after the log is saved than when you were logging live?

which version of the suite are you running?

which version is your tuner running?

[HaasExp]

I do not believe the PCM even knows the actual position of the cam at all, but reports out what position is being commanded by the PCM. So when you put a phase limiter in, you can still see cam position being reported in HPT as something which is beyond what the phase limiter allows ... I'm not 100% confident of this understanding though, so do some research and verify 1st.

The PCM has to know where the cam physically is to be able to control the VVT solenoid and meet the commanded position. This is a closed loop control system.
You should be able to log the desired (commanded) position, the actual position and the error.

[LilSick]

You should be able to log the desired (commanded) position, the actual position and the error."

pid's 2176 and 2195 are avail for the 2014 NGC controller

ex lobe center position and ex lobe desired position

if you put em on top of ea other you might not even error

*it is avail too tho just in case : )

[[email protected]]

Yes, to reply to your earlier thread and appreciate your reply. I have read a lot of your other replies and posts on here before. When we plug the hp tuners MPVI in it is showing variation in camshaft movement in the cam tables. However, when we send the data log for that tune to our tuner, he is seeing no cam movement at all. For the first couple of tunes, the tuner was using whatever the software version is that is not the beta and my mechanic?s HP software is the beta. The current tune on the car he sent was done with the beta version as well. The goal is to get the emissions monitors to set. Recently got the car back and have had no luck. Have put about 200 or so miles on it highway and stop/go but no luck. But yes, we are seeing one thing on our end like camshaft movement and the tuner is not seeing the same thing at all. The car is not doing what it is commanded to do in the tune. It?s leading us to believe the PCM may be bad. Before HP tuners, I had a Diablo sport on the car before as well as a ZAutomotive Tazer. The car runs great but none of the emissions monitors will run. They all say incomplete.

[LilSick]

Tazer can cause all sorts of issues in some of the different boxes (mostly the RF Hub and the BCM), but it will not damage your PCM.

it cannot write to the PCM.

switching from holley to HPT "should not" cause any problems...

some of the pro's use both CMR and HPT to write their tunes : )


do you have the original read?

post or email me both and i will look