EfiniX
Well-known member
I've assembled my notes and I'm almost convinced, but I'd love some seasoned eyes on this. I've got 8 logs that show what I'm trying to chase down. 1-4 counts of knock at low RPM and low/no boost. Generally, if I'm in any gear crossing 3100-4000 RPM's w/ 33-38% throttle position, I see knock about 60% of the time. The state of things when the knock occurs looks OK in the log. There are a few things worth noting:
My knock control was set pretty low on the first few logs: 2750R/30TP
I turned it up to 3000R/40TP before the log6 pull. Then guess what; a few counts around the same rpm range, just at higher TP.
My coolant offset is 5, so if the car is at 186 (which is where it seems to like to be sometimes, that's ok)
I've seen in two logs here, and in some other logs I'm not sharing, an odd spike in my AFR's @ around 3300 RPM's. The AFR will spike to 15.0:1 for a split second, then go back to where it should be. It's on two logs here: Log2 and log8
I've got 264 cams and no balance shaft. FP mani, 3" Fujitsubo turbo-back... I rumbles, to be sure. I also have a knock sensor that's less than a year old, and EHMotorsports put it in, so you can be sure it's installed correctly.
Basically I'm trying to figure out if my noisy, shaky engine is causing this, or if it's something I should be trying to tune out. I've not touched the timing yet as the problem is inconsistent, a few counts isn't going to blow the motor up, and this part of the timing map is fairly stock. Obviously, I can use knock control to "fix" the problem, but I certainly don't want to ignore legitimate knock.
Oh gurus of the 4G63, bestow upon me your wisdom. Link to logs and a spreadsheet detailing where the knock is happening for ease of review here:
click
Now I'm wondering if Evan has any race gas....
Thanks in advance!
My knock control was set pretty low on the first few logs: 2750R/30TP
I turned it up to 3000R/40TP before the log6 pull. Then guess what; a few counts around the same rpm range, just at higher TP.
My coolant offset is 5, so if the car is at 186 (which is where it seems to like to be sometimes, that's ok)
I've seen in two logs here, and in some other logs I'm not sharing, an odd spike in my AFR's @ around 3300 RPM's. The AFR will spike to 15.0:1 for a split second, then go back to where it should be. It's on two logs here: Log2 and log8
I've got 264 cams and no balance shaft. FP mani, 3" Fujitsubo turbo-back... I rumbles, to be sure. I also have a knock sensor that's less than a year old, and EHMotorsports put it in, so you can be sure it's installed correctly.
Basically I'm trying to figure out if my noisy, shaky engine is causing this, or if it's something I should be trying to tune out. I've not touched the timing yet as the problem is inconsistent, a few counts isn't going to blow the motor up, and this part of the timing map is fairly stock. Obviously, I can use knock control to "fix" the problem, but I certainly don't want to ignore legitimate knock.
Oh gurus of the 4G63, bestow upon me your wisdom. Link to logs and a spreadsheet detailing where the knock is happening for ease of review here:
click
Now I'm wondering if Evan has any race gas....
Thanks in advance!