HELP High KNOCK at high RPM with 255lph and 550cc

[pgcanillas]

I need help with the following: After 5500RPM, I start having a lot of knock (more than 20).
My car has an OEM 14b, an OEM I/C, 255 lph, stock fpr, 550cc Injectors, 2,5" exhaust, no cat, 2,5" downpipe, and an upper I/C pipe. I also have an Apexi AVCR, and a SAFC, plus an AEM WideBand, and a pocketlogger. My plugs are BPR6ES gapped at 0,3.
I am suffering of boost creep, so I decide to make the fuel upgrade, in order to do not have to worry about this. So I am running 17 psi, which is the lowest that I can.
The problem is the following, I have tune my fuel curve to be between 10,3 to 10,5 while I am at full throtle, and under the Boost. The car goes well up to 5600RPM, and then the knock start, and pull my timing up to 10 degrees ( the maxium I see at 5500 rpm is 18 degrees), making the car feels slow.
How can I solve this? THANKS!!!

PD: Excuse my English, I am from Argentina, and my natural language is Spanish.

 

[hubz91talontsi]

Best way would be to find a higher octane fuel or some type of fuel booster.

 

[pgcanillas]

I am running 94 octane, and here is very dificult to get anything more than that. We do not have access to racing fuel. Even racing cars, runs on pump fuel!!!

 

[kronus]

Are you running a 1g MAS? IF so, what's your airflow reading? And is it hacked in any way?

 

[zhjiln]

you have a 255lph but only have stock FPR ....maybe you just need a AFPR....

 

[pgcanillas]

yes, I am running the 1g MAS, but without the lower honey comb, and the air can (K&N exposed). About the airflow reading it is 1607hz (that is the maximun that the pocketlogger log) constant, when I acelerate.

 

[kronus]

yes, I am running the 1g MAS, but without the lower honey comb, and the air can (K&N exposed). About the airflow reading it is 1607hz (that is the maximun that the pocketlogger log) constant, when I acelerate.

Could it be that you've begun to overrun the 1g MAS? If you know that 1607Hz is the limit of the MAS and that's where you're at, I would think this might be that case. What's your AFR when you begin to knock?

 

[pgcanillas]

The pocketlogger only logs up to 1607HZ, but the MAS is not overrun up to more than 2200HZ. On the other hand, I have changed my injectors from 450 (I have the same problem, knocking at more than 5500 RPM) to 550, in order to be able to decrease my SAFC settings, to let the ecu thinks that it has less airflow that the one it really has.

 

[kronus]

The pocketlogger only logs up to 1607HZ, but the MAS is not overrun up to more than 2200HZ. On the other hand, I have changed my injectors from 450 (I have the same problem, knocking at more than 5500 RPM) to 550, in order to be able to decrease my SAFC settings, to let the ecu thinks that it has less airflow that the one it really has.

I've heard that the 1g MAS begins to break up @ ~1800Hz.