I was wondering if anyone else has had this problem, i have a rebuilt gsr with usdm type r pistons and almost all bolt ons 11:1 compresion ratio. when ever im on the freeway at 4000 rpm my the cheak engine light comes on, its code 23 knock sensor. but the funny thing is that it only turns on on the freeway at 4000 rpm after about 10-20 seconds. no code any other time even reving to 8500

 

bump

 

anyone even a guess could spark the idea

 

check for driver error
sorry trog a log i had too

 

is it tuned?

 

no not tuned yet

 

bump

 

get it tuned

 

Check thy timing. 11:1 puts the hurt on pump gas.