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Old 09-21-2018, 11:02 PM   #1
Whiteb0y
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Default Question regarding EJ vs DiT DAM changes

There's been a lot of great posts scratching the surface of how Subaru updated their knock correction system. BrenTuning had a good right up.

https://brentuning.com/?news=subaru-...u-need-to-know

From what I gather drop in DAM during low load/RPM conditions on the DiT platforms should be precieved differently than on an EJ. That DAM is in a way more like FLKC.

If this is the case, what are acceptable DAM/FBKC values during low load/rpm conditions?
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Old 09-22-2018, 11:20 AM   #2
X49
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In my opinion, a good tune should always result in a DAM of 1 in normal driving conditions. DAM reduction should only really happen if you get a bad tank of fuel. FBK of -1.41 should only be happening occasionally under conditions like high intercooler heat soak that can't easily be tuned out (or from false a/c compressor knock). Even if low load knock events are not very damaging, it's best to avoid them.

A problem with DAM reduction is that the dynamic advance tables aren't well tuned, and a lot more timing is pulled at high load than at low load, even if all your knock is happening at a certain problem area at low or moderate loads. This results in a significant loss in power and worse efficiency. DAM reduction is tuned to be very safe, however, due to all the timing pulled at high load, where knock can do a lot of damage.

Professional tuners will always tell you not to worry about a bit of knock, because tuning most of it out at low/moderate loads is very timing consuming compared to just tuning WOT. If you're tuning your own engine, there's no reason not to tune for a DAM of 1, very occasional FBK/FKL of -1.41 to -2.81 at low/moderate loads, and virtually never any high load knock.
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Old 09-22-2018, 11:55 AM   #3
Whiteb0y
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So in essence nothing "really" has changed.

We just purchased our first DiT vehicle (wife's '17 FXT) & I wanted to get a full grasp on any differences before I started dialing everything in. On an EJ I get diagnosing real v phantom knock. I didn't want to treat this new platform in the same manor if it shouldn't be and the above article and COBB's write up had me scratching my head.

I appreciate the input.
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