Why doesn't my car knock with the t25?

[truwarrior]

I was messing with my boost and at times was running 20 psi with the t25. Shouldn't this cause massive knock? DSMLink was set to display a check engine light if the engine knocks but it ever lit up. I didn't have the laptop hooked up for a log though so I don't have any raw numbers.

For such a hot turbo I don't get why it wasn't knocking...?

 

[Kevin Jewer]

Could be because airflow is so low cylinder pressure doesnt get very high. In my case I think I did see some knock at 20 psi on pump gas, No problem on race gas naturally. That was a long time ago though. Post a log, I'd like to take a look.