- Buick Ownership
OK, so I finally went ahead and replaced the stock air filter with the K&N air filter. First day I noticed right away that the ECU was making adjustments due to a sudden increase or decrease in air flow. Actually, the car started running just like it did on the Trifecta tune (engine wise). I went out and logged a run and it showed a decrease in torque from 325 ft-lbs to 304. I can confirm that by the seat of my pants as I did feel a lack of torque while logging. Also, the power was peaky as opposed to being spread out across the rev range however the engine has picked up some additional power because when it comes on, I'm spinning the front tires while doing 60mph! I did sort of expect this with the K&N as past installs on other cars yielded a slight loss of power down low but increased power up top. Day 2, the ECU has seemed to iron things out with the filter change because now the log is showing torque at 318 versus 304 from yesterday. Engine is running smoother, knock is down from 6.5 to 1.3 and the tranny now seems to run through the lower gears quicker than before. I going to see if Jerry can smooth the power out like it was with the stock air filter but so far the engine pulls a little harder but turbo lag is also a bit worse. Also, for the first time I can hear the BOV which is meaningless for me in this car since it is designed to be whisper quiet. i will see if i can get somewhere and do a run to compare it against the last one. Got into it with a 2015 Dodge Charger Rallye Edition (V6, 300hp)while heading to work this morning. Let's just say I put some distance between him and I in a hurry.