Blackmount
01-31-2012, 06:47 PM
Sooo some of u already know my deal but for those who don't
My SL is getting heavy knock lately. Started two weeks ago. Doing a Pull and car read zero knock then shifted into 3rd and went WOT again and knock spiked to 20 some odd counts and and slowly cleared up as i went through the rpms. Thought it was wierd so i did samething again. And it did the samething. So parked it for the night. Havent had time to mess with it or even drive it cause ive been out of town. So most i did was retard the CAS a little. Brought my knock counts overall to under 20. So it helped a little but its close to fully retarded now.
So today i took a long drive with the car to do some more logging.
Problem worsens the longer u drive it. I started showing knock as high as 10 counts at about 2500rpms if i went passed 30% throttle according to my loggeer. It would start at one or two. Then slowly increase as i accelerated. The only im not knock as much or at all is WOT at just under 6000rpms, and Up.
My timing at WOT is 17*. Up until 2 weeks ago. I was running 23* timing with an occasionaly 1 or 2 count knock AT MOST on the logger.
I try to run my datalogger at least once a week to catch problems such as this.
Specs. 92 3000GT DOHC with 93 engine. Running full 92 management.
93 octane Gasoline
K&N Airfilter
Intake Hardpipe
3sx Downpipe
Test Pipe.
Those r all my engine related things.
My SL is getting heavy knock lately. Started two weeks ago. Doing a Pull and car read zero knock then shifted into 3rd and went WOT again and knock spiked to 20 some odd counts and and slowly cleared up as i went through the rpms. Thought it was wierd so i did samething again. And it did the samething. So parked it for the night. Havent had time to mess with it or even drive it cause ive been out of town. So most i did was retard the CAS a little. Brought my knock counts overall to under 20. So it helped a little but its close to fully retarded now.
So today i took a long drive with the car to do some more logging.
Problem worsens the longer u drive it. I started showing knock as high as 10 counts at about 2500rpms if i went passed 30% throttle according to my loggeer. It would start at one or two. Then slowly increase as i accelerated. The only im not knock as much or at all is WOT at just under 6000rpms, and Up.
My timing at WOT is 17*. Up until 2 weeks ago. I was running 23* timing with an occasionaly 1 or 2 count knock AT MOST on the logger.
I try to run my datalogger at least once a week to catch problems such as this.
Specs. 92 3000GT DOHC with 93 engine. Running full 92 management.
93 octane Gasoline
K&N Airfilter
Intake Hardpipe
3sx Downpipe
Test Pipe.
Those r all my engine related things.