[Petah78]

Originally Posted by drift86

Based on my experience with the 2.0, it's pretty normal for these engines to knock a bit in low rpm high load situations.

I used to set an alert on the knock channels on the OFT and it almost always detects a bit of knock if you floor it at less than around 3500rpm unless you are on e85.

If you do it a lot, then the IAM will drop below 1.0, pulling timing across the whole rev range which reduces your power. It takes a bit of knock free driving to bring it back up to 1.0.

So it's best to downshift if you need to pick up some speed if you aren't in the powerband.

Thank you! This is excellent info. I have always noted the unpleasant sound at low revs and have learned not to load up the engine at low revs. I rather downshift. This confirmed my suspicions.