help Broke my engine

[mhd]

Hi every body

a few days a go during auto cross comption the track only 1:30 min after finshing the track I heard the engine making tiking sound badly , and the car was before very good
I saved the data looging and the file
So can any body tell me what wrong was lead to broke my engine
The engine EJ25 stroker 2.71L GT35 Big cams and a lot more
I was Running anti lage On and less than 1 Bar of boost on 98RON fuel

Thank's in advance for your help guys
M.Olabi

[RossB]

Your log file is not showing much, you seem to have lost the lambda reading during the run. What broke in the engine?

[mhd]

Dear Ross B

Thank's for rplying
the rod and the rod bearing for the first piston broken and I notice some knock mark also on the same piston(the car stroker pro BC 2.71 engine can handel over 650HP)
Also I notice on the 1 gear at 5000rpm 200kpa the car run 1.00 lamda reading but on the 4 gear the car at 5000 200kpa the car run 0.80 lamda Whay ? this happen only in the short track (autocross) when I used 1 and 2 gear only and a lot on and off TP

Thank's a Lot
M.Olabi