tuning prob. 9.5:1 afr but lots of knock

[dsm-onster]

Take a look at this: Sparkplug reading

Great site! I have it on my bookmarks already!

 

[1SloColt]

Yeah that site is a definite sticky for good tuning capabilities.

 

[pickens]

Two problems with trying to read plugs in a FI motor. To read a plug, you have to shut it down after a WOT run. Needless to say, not good for a turbo to stop the oil flow when its red hot. Second, its still guesswork, and FI motors don't take kindly to bad guesses. Reading plugs is a thing of the past with all the technology we have nowadays (WB 02, data loggers, EGT,etc). Get a WB and datalogger and never guess again.

 

[1SloColt]

To read a plug, you have to shut it down after a WOT run. Needless to say, not good for a turbo to stop the oil flow when its red hot. Second, its still guesswork, and FI motors don't take kindly to bad guesses. Reading plugs is a thing of the past with all the technology we have nowadays (WB 02, data loggers, EGT,etc). Get a WB and datalogger and never guess again.

Yes after the dyno pull you shut the car down too to let it cool off. Its during this time where you would pull a plug or two. Guess work? , if you knew how to read a plug properly there would be zero guesswork, try again. I know people who tune AEMs, Utecs, AFCs, dsmlink, for decent amounts of money and fly around the country to do it. They are advocates of pulling plugs and looking at whats going on inside the motor. I'm gonna side with the people that make their living tuning cars, considering their income rests in the hands of their tuning abilities.

Obviously widebands and dataloggers are used to tune cars for the most potential power, but its nice to know whats exactly happening inside the combustion chamber.

 

[44pirate]

Is your LC-1 calibrated? Did you calibrate before installation?

 

[crazyboost]

yes it has been calibrted. Yesterday i checked the base timing and it was 9 degrees btdc so i changed it to five. Today I checked for boost leaks and found a rather sizeable one around my throttle body, i could even hear it at idle. So i sprayed it with windex and it bubbled like crazy. I think it's the seal on the throttle cable side. I have heard that is a common spot too for a boost leak. So hopefully when i get that fixed i will have less knock and be able to lean it out to 11:1 afr or so.