Stage 1 Log

[Subieaction]

Hey, evening. I wanted to know if Someone can take a look at this log for me. I am running a Stage 1 from cobb map 91oct. Only mods are a magnaflow exhaust and exedy comp clutch. I see that there is a large amount of knock around 3rpm.

 

Thanks,

Chris

datalog29.csv

[serx7]

Your pull starts around 3400 rpm but the learned corrections are being applied b/n 4k and 5.5k rpm, some of which are multicount (ie: ECU heard knock, pulled -1.4 deg, still heard knock, pulled another -1.4 deg, still heard knock, pulled another -1.4 deg, etc).

 

Do a brief idle log including AF Learning #1A, B, C, D, to see what your long term fuel trims look like. If none of the trims are pegged max (15 I believe) and otherwise look decent (+/- 5% preferred, +/- 10% still sort of OK but IMO not so OK), you might be able to rule out a leak that's causing you to run lean. IIRC the Cobb OTS maps allow the D trim to also be applied to open loop/WOT so you don't want to see the D trim too negative (lean).

 

If you feel like experimenting, reset the ECU, use the AP to pull -3 to -5 deg global timing, warm up the car fully, drive it around for a while to let the fuel trims settle in again (the higher trims can take more than a day depending on your driving style/conditions), then repeat the 3k+ rpm pull/s, and see if you still see the knock show up in the logs. If the previously seen knock situation doesn't clear up much/at all after pulling -3 to -5 deg global timing, it could be a mechanical cause (loose heat shield, drivetrain noise etc).

[Subieaction]

Logging it now will upload when finished. I do have a lose heat shield after I let go of the gas still in gear that rattles.

[serx7]

Ah. Fix the loose heat shield before you go through the effort of doing more WOT logs. Hopefully that's the sole cause of your logged knock.

[mikeydrives1]

Thats a fair amount of fine learned knock there for just 14-15lbs of boost pressure on a stock turbo. A loose heatshield in my tuning experiences has and will cause the sensor to start picking up false noise in the middle of pulls, depending how bad it is rattling.

[Subieaction]

Will tighten it this weekend when I go to change the spark plugs. Yes there is a bit of rattle when I let go of the pedal but don't always notice it when I am engaging the pedal. The 15lb boost is at the peak for my stage 1 tune.