KR when getting off the throttle after going into boost
09-08-2005, 12:22 AM
#1
TECH Addict
Thread Starter
KR when getting off the throttle after going into boost car only getting KR so far when I lift off the gas. I see it right at 105kpa in my scanner logs.
ignore the fact there is no data for boost, don't have that setup yet. it was only like 4 or 5 pounds.
any ideas?
ignore the fact there is no data for boost, don't have that setup yet. it was only like 4 or 5 pounds.
any ideas?
Last edited by Blackbird; 09-08-2005 at 12:27 AM.
09-08-2005, 06:17 AM
#2
Kr I have also seen this on N/A cars with very large cams (T_TREX), just as you lift you will see some KR and even some lean spikes, I beleive this just to be false knock due to ??. The knock sensor is picking up some audible sounds from abruptly being at WOT to O, What it is I am not sure..
09-08-2005, 12:24 PM
#4
If it is only happening under boost (ie it didn't happen before forced induction) then I it could be compressor surging.
Do you have a blow-off or bypass for the system?
If not, or if it is small enough to generate flutter in your intake tract it may be setting off the knock sensor.
Do you have a blow-off or bypass for the system?
If not, or if it is small enough to generate flutter in your intake tract it may be setting off the knock sensor.
09-08-2005, 12:32 PM
#5
TECH Addict
Thread Starter
mondo bypass running wide open (ie venting to atmosphere)
this is a home made D1 setup btw.
buddies car, not mine.
car has been fi for a long long time, never did it before but we have made lots of changes.
this is a home made D1 setup btw.
buddies car, not mine.
car has been fi for a long long time, never did it before but we have made lots of changes.