seabrook
Senior Member
- Joined
- Nov 14, 2018
- Posts
- 877
- Reaction score
- 734
- Location
- seabrook
- Ram Year
- Black 2018 Night
- Engine
- 5.7 3.92 anti slip
I use the Diablosport Trinity to log ST/LT knock. Like I said, even on 93 I was getting knock which reduces timing/power.
This isnt just one vehicle either... It was my 09 5.7 1500, my 2012 5.7 1500, my 2013 5.7 Challenger, my GF's 13 v6 Charger, her v6 Jeep and now my 20 1500 5.7. Every single one of those got high ST or LT knock on 93 octane. I live in Texas so the heat has something to do with it but I have a 180 therm on my Challenger and it was still happening. I installed catch cans on all of them and instantly saw a reduction in knock.
The fact is, you will not know if your engine is reducing timing due to knock as its not always audible. You have to either log it or do the octane test with a few tanks to see if your MPG increases as your octane increases. Thats a clear sign that the lower grade is causing timing reduction.
knew it i tell these guys all the time, yeah it will run on 87/89 but at reduced performance and you going to have some knock and to have reduced performance the knock has to happen. so all the are doing is putting in knock sensors and adjusting the timing according to the knock- it's a feedback loop.... thats why i run 93 and like noted above 93 will knock (i worked in a knock room) but at a much reduced rate (less than a percent) than 87/89 and you get full timing until it gets hot and you get a knock