I have a 2014 Ram 5.7l that i am currently trying to dyno tune, not having the least bit of success.
Truck has shorty headers, cai, and a cam. NO CAM PHASER, NO VVT. VVT has been disabled in the tune along with neural network.
First of all, i am only able to perform tuneable runs at above 4000-4500rpm due to not having access to adjust the parameters to keep it from downshifting, unless i pay $200 for the 4 tcm credits just to be able to perform a full dyno run. I am accepting that that is just not going to happen.
Primary issue though is, the very first run, not having touched anything to do with wot, has so far made the most power. Ever since that first run, power has decreased from there due to timing being pulled. Getting fuel dialed in does make more power than the tune i started with, however, there is still a 20hp/50lbft gap between what is makes now and what it made on the very first run. I also have run it multiple days now, so anything to do with heat has been ruled out. I have even copied the WOT base timing table over to the WOT Thermal table with no luck. Example of what i am seeing for timing: Very first run at 5k rpms the truck was running 16.5deg, whereas every run after that has been at most 10.5deg and as little as 8deg. I have even loaded the original tune i started with back in and it is still down 60hp because somehow actual timing is less than before. Also absolutely no knock retard in these runs so rule that out too. Nothing in the logs show any explanation for this, i have everything to do with ignition logged.
I had gotten to the point where i have added 8+ degrees to the WOT Base, WOT Thermal, MBT Base, WOT VVT Lockpin, and even Part Throttle base and while i actually did eventually make a bit more hp, torque was still way down and actually did start throwing kr in that region. Also, even though i was adding 8+ degrees, thats not atall how much it actually increased timing, more like an additional 4-6deg.
I am currently at a loss right now as the original WOT settings make the most power and the least power on the same exact tune, and everything i can do to increase power puts me somewhere in the middle. FYI that first dyno run made 318hp and 361lbft and now on the same tune is making at most 300hp and 318lbft, running 11.6-12afr(again at stock fuel settings). I can post dyno runs and logs/tune if needed.
Also, this is not my first time tuning a hemi, but is the newest one i have tuned. Few weeks ago i tuned a 2013 charger hemi with vvt without issue. I have never had any type of issue like this on a dodge platform.
