Originally Posted by
gmtech16450yz
Post up a log if you want. LNF's have what I think is the cr@ppiest knock control system I've ever seen in an ECM. In an E38, if you see 1.7 degrees KR in a certain cell, lower that cell's timing 1.7 degrees and the KR will be gone. False knock is almost never a problem in other ECM's, in the E69 there's more false knock than real knock! Fuel mixtures will absolutely cause KR. Here's what I tell guys that have a bunch of KR in their logs- advance the ign timing and lean out the mixtures. Really! That's absolutely horrible advice on any other motor, but on the LNF it's usually what needs to be done. I say advance the timing because most guys have retarded it so badly trying to stop the KR, and it's not actually caused by the timing. If you advance it, and it is from timing, you'll see the KR go up, which will tell you something.
Don't tell anyone, but I haven't used ANY knock control in my LNF in a very long time! I trust my ign timing and tuning, I don't need a cr@ppy knock control system screwing with my timing. Remember, we "old timers" tuned engines without the aid of knock control for many, many, many years. It it's a good system, knock control is awesome. If it works like cr@p, don't use it. (DON'T TRY THIS UNLESS YOU'RE FULLY AWARE OF WHAT YOU ARE DOING.)