EVIL_EV0

iTrader: (6)

I have a built 2.0L w/balance shaft eliminators. While tuning and starting with a conservative map I encountered knock. I added 5 gallons of 100 octane and still encountered knock. I even backed off timing and still no love.

I would like to modify the knock tables to account for what I am convinced is mechanical noise. I've searched but just can't seem to find a thread that has clean instructions for doing so. Help!

wreckleford

iTrader: (2)

From my experience with noisy motors, most of the time the false knock happens between 2500 to 3500 rpm at relatively low loads (100-120 or so). So what I normally do is adjust the knock load table first.

2500 rpm to 159.4
3000 rpm to 100 or 120

That usually clears it up.

If you are having false knock at higher loads you can then adjust the low mid and high rpm multipliers. Usually just by 1 at a time. I normally don't need to adjust them as I find higher load knock normally turns out to be real.

The knock adders have less effect than the multipliers so most people don't adjust them.

If you have a 9 the knock multipliers are in a table instead of three discrete tables.

EVIL_EV0

iTrader: (6)

Excellent information. Thank you very much!

JohnBradley

iTrader: (30)

22 in the mid range and 24 by 7k normally is the limit for still having "decent" factory knock protection. Do not vary from your original pump timing past that point unless you understand knock voltage and have a dyno to see quantifiable gains/losses. You can go more but you need to know what to look for when you start really numbing the sensor.

Evo9_Dubai

I am getting a lot of counts of knock at 3700rpm. Sometimes it happens and sometimes it doesn't. How can I adjust my knock tables to tune it out? I have noisy cams & injectors, as well as a built 2.0L

EVIL_EV0

iTrader: (6)

Do EVO9s use the three individual maps at all or should we really only modifying the threshold map?

wreckleford

iTrader: (2)

The 9s have one map rpm based map that is used instead of the three maps the 8s have. This is a different map to the threshold map.

Boosted Tuning

iTrader: (12)

Its because at 3500 you have 159 and at 400 you have 70. Bring the other cells up and more inline with the first cells.

Evo9_Dubai

Thank you. Will try that and report back.

stunt2

iTrader: (8)

by how much for example ?