How to identify ghost knock
#22
Greg, I have run more datalogs since the one I sent you and am no longer getting the knock counts at idle. I am now just getting them around 3200 rpm.
I took out the 6 degrees retard we had on cylinder two and the extra fuel we threw in as well. No change in knock counts or how the car drives.
Looks to be ghost knock. Thanks guys!
I took out the 6 degrees retard we had on cylinder two and the extra fuel we threw in as well. No change in knock counts or how the car drives.
Looks to be ghost knock. Thanks guys!
#23
Former Sponsor
Thread Starter
You might want to leave a couple degrees of retard on cylinder 2 just in case some of those knock counts were real. The calibration that you and I created does have more agressive timing than stock, so it's better to be safe than sorry. I guess we'll know more when you change the spark plugs. Make sure to check the plugs that you remove for signs of detonation.
#25
Former Sponsor
Thread Starter
Originally Posted by maluch,May 5 2010, 04:01 PM
what kind of threshold(volts, 0-5v) are you guys using to identify knock?
#26
does knock count mean it actually pulled timing? my car sees up to 2 volts of knock up to redline, its not a big deal. look at the knock voltage table, so you can see rpm vs knock voltage and when it starts to pull timing.
as rpms go up, ussually the table will allow for more knock before it starts to pull.
as rpms go up, ussually the table will allow for more knock before it starts to pull.
#29
Originally Posted by gernby,May 3 2010, 01:39 PM
The knock tables can be adjusted to change the knock retard, but they don't seem to have any impact on the actual knock counts. The knock counter really seem pretty independant of the rest of the system.
#30
Registered User
Greg, I have run more datalogs since the one I sent you and am no longer getting the knock counts at idle. I am now just getting them around 3200 rpm.
I took out the 6 degrees retard we had on cylinder two and the extra fuel we threw in as well. No change in knock counts or how the car drives.
Looks to be ghost knock. Thanks guys!
I took out the 6 degrees retard we had on cylinder two and the extra fuel we threw in as well. No change in knock counts or how the car drives.
Looks to be ghost knock. Thanks guys!