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Thread Starter
Registered User
Joined: Dec 1998
Posts: 24
From: kansasville wi
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Here on the board i have read to disable the burst knock by Zeroing it in Burst knock %diff air flow thresh. By the wording it would seem to "allow" burst knock at any airflow level more then 3.6%difference.
Setting it to 99.6% would allow retard only if the airflow suddenly doubled. correct? 3.6% seems like a setting for avoiding ping if you are in cruise at 65 and a slight incline would pull a few more CFM but not really any RPM change. Even setting it to 99.6 would still enable burst knock in just about any aggressive throttle change with a blower. CFM will almost immediately spike. So unless you change the "Burst knock enable coolant temp thresh" way hot you will get burst knock whenever you get on it. Is this correct? Please reply if my understanding is incorrect.
It seems like a really much more useful table for forced induction would be Burse knock VS. IAT.
The intercooler blower and tubing getting heat soaked and reducing blower efficiency will increase detonation propensity.
A spike in inlet temp is just as important as a spike in Total airflow. Do the GN,Syclone and 6 cyl+ positive displacement blowers based pcm's use a knock retard VS air temp ? Have any of you folks poked around different PCM's to see how retard is handled?
Setting it to 99.6% would allow retard only if the airflow suddenly doubled. correct? 3.6% seems like a setting for avoiding ping if you are in cruise at 65 and a slight incline would pull a few more CFM but not really any RPM change. Even setting it to 99.6 would still enable burst knock in just about any aggressive throttle change with a blower. CFM will almost immediately spike. So unless you change the "Burst knock enable coolant temp thresh" way hot you will get burst knock whenever you get on it. Is this correct? Please reply if my understanding is incorrect.
It seems like a really much more useful table for forced induction would be Burse knock VS. IAT.
The intercooler blower and tubing getting heat soaked and reducing blower efficiency will increase detonation propensity.
A spike in inlet temp is just as important as a spike in Total airflow. Do the GN,Syclone and 6 cyl+ positive displacement blowers based pcm's use a knock retard VS air temp ? Have any of you folks poked around different PCM's to see how retard is handled?