Hi Everyone,
I've been having some sort of issue on WOT after 4500 RPMs where the car stutters/jerks really bad after hitting somewhere around +20 psi.
I've already replaced spark plugs (gapped at 0.020), checked coils, no misfires or any CEL codes. Replaced TPS sensor... Car keeps doing this under load.

Mods:
- Evo 9 turbo kit
- Grimmspeed 3port boost controller
- HKS Turbotimer
- Injen Intake
- upgraded intercooler with boost pipes
- custom MAFless tune

Car was working perfectly, and started to fail after almost 2 years of track usage,

Logs attached with EvoScan.
Also Logs can be reviewed via Datazap here: .https://datazap.me/u/ganque/evo-logs...data=6-7-23-24

Any advice is greatly appreciated.
The car is not mine, but it belongs to a good friend and customer at my shop.

 

Include load1B, knocksum and a wide-band O2 reading if you want help diagnosing your problem. There is not enough information in your current logs to figure out what is going on..

 

this!
from the description it sounds like spark blowout which could indeed only happen over 20psi.
mad the coils start to die they will fail first under the highest load/cylinder pressures.
check all your chassis/block/head/alt grounds are tight/clean and run a fresh set of coils/plugs together along with the logged parameters mentioned above.