MY350Z.COM Forums - View Single Post - Interesting Knock Issue (and wheres scaling in utec 2.8d?)

athenG · 06-30-2008, 09:18 AM

how do you know if it is the A/F that is causing the knock on the 0 column? What is your crossover point? To many variables here that you are missing... I used to have problem with knock at ECU control and adding more fuel didn't fix it. I had problem with knock around 2500-3000rpm so I had to to adjust my Open Loop crossover to -1 instead of 0 psi and that fix the problem. Sometimes there is a delay between the transition from ECU to Utec. Like I said it will be FOOLISH to attempt to tune without a wideband. Scaling the 0 column sometimes wont fix it because the ECU is still controlling the Timing and that could be the culprit. Please use logger 1 again coz your log is incomplete for us to make an assumption.

06-30-2008, 09:18 AM	#6
athenG Registered User Join Date: Nov 2005 Location: NYC Posts: 1,649 iTrader: (2)	how do you know if it is the A/F that is causing the knock on the 0 column? What is your crossover point? To many variables here that you are missing... I used to have problem with knock at ECU control and adding more fuel didn't fix it. I had problem with knock around 2500-3000rpm so I had to to adjust my Open Loop crossover to -1 instead of 0 psi and that fix the problem. Sometimes there is a delay between the transition from ECU to Utec. Like I said it will be FOOLISH to attempt to tune without a wideband. Scaling the 0 column sometimes wont fix it because the ECU is still controlling the Timing and that could be the culprit. Please use logger 1 again coz your log is incomplete for us to make an assumption.