Do P8 cossys have knock control?
31-01-2005, 06:49 PM
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Originally Posted by SECS
It doesnt as far as I know.
Knock control on P8 is useless above 4000 rpm anyway !!!
Knock control on P8 is useless above 4000 rpm anyway !!!
I'm trying to sort out if Ishould use some kind of ignition retard module when I use nitrous,in order to lower detonations that may accur..
or I can trust on the original knock control 
31-01-2005, 06:56 PM
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Control of knock on production engines can be confused with internal
high speed mechanical noise of the moving parts as the engine wears.
In effect, if it ran closed loop continuously, as the engine wears over time
(even after a few 100 miles) the high frequency component of the
noise confuses most knock systems that knock is active when it isnt.
The result is ignition retard and power loss.
Nearly ALL ecu's that employ knock control disable the feature after a certain rpm
and over a pre-determined boost pressure level.
Another reason for this is....
If the knock sensor failed during high load situations, the closed loop action
could in effect have the reverse effect of advancing the ignition as it may
think there is NO knock and this COULD result in producing DET.
high speed mechanical noise of the moving parts as the engine wears.
In effect, if it ran closed loop continuously, as the engine wears over time
(even after a few 100 miles) the high frequency component of the
noise confuses most knock systems that knock is active when it isnt.
The result is ignition retard and power loss.
Nearly ALL ecu's that employ knock control disable the feature after a certain rpm
and over a pre-determined boost pressure level.
Another reason for this is....
If the knock sensor failed during high load situations, the closed loop action
could in effect have the reverse effect of advancing the ignition as it may
think there is NO knock and this COULD result in producing DET.
31-01-2005, 07:19 PM
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cosworthbg, DO NOT rely on a knock sensor to control ignition for nitrous.
Even when working it will NOT react quick enough to prevent damage
under heavy load.
On a cossie (weber ecu) system, the ignition can be retarded very easy under nitrous
as there is an octane adjustment plug that can retard the ignition by 2,4,6 or 8
degrees by linking two or more wires together. (when NOS is active)
However, This is VERY chip manufacturer/ECU type dependent and will have to be
live tested under load by someone who knows what they are doing to
prevent "liquid pistons".
Even when working it will NOT react quick enough to prevent damage
under heavy load.
On a cossie (weber ecu) system, the ignition can be retarded very easy under nitrous
as there is an octane adjustment plug that can retard the ignition by 2,4,6 or 8
degrees by linking two or more wires together. (when NOS is active)
However, This is VERY chip manufacturer/ECU type dependent and will have to be
live tested under load by someone who knows what they are doing to
prevent "liquid pistons".
31-01-2005, 07:26 PM
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Originally Posted by SECS
cosworthbg,
On a cossie (weber ecu) system, the ignition can be retarded very easy under nitrous
as there is an octane adjustment plug that can retard the ignition by 2,4,6 or 8
degrees by linking two or more wires together. (when NOS is active)
On a cossie (weber ecu) system, the ignition can be retarded very easy under nitrous
as there is an octane adjustment plug that can retard the ignition by 2,4,6 or 8
degrees by linking two or more wires together. (when NOS is active)
,but where exactly is that octane adjustment plug situated???
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31-01-2005, 07:27 PM
#8
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Originally Posted by SECS
cosworthbg, DO NOT rely on a knock sensor to control ignition for nitrous.
Even when working it will NOT react quick enough to prevent damage
under heavy load.
On a cossie (weber ecu) system, the ignition can be retarded very easy under nitrous
as there is an octane adjustment plug that can retard the ignition by 2,4,6 or 8
degrees by linking two or more wires together. (when NOS is active)
However, This is VERY chip manufacturer/ECU type dependent and will have to be
live tested under load by someone who knows what they are doing to
prevent "liquid pistons".
Even when working it will NOT react quick enough to prevent damage
under heavy load.
On a cossie (weber ecu) system, the ignition can be retarded very easy under nitrous
as there is an octane adjustment plug that can retard the ignition by 2,4,6 or 8
degrees by linking two or more wires together. (when NOS is active)
However, This is VERY chip manufacturer/ECU type dependent and will have to be
live tested under load by someone who knows what they are doing to
prevent "liquid pistons".
great idea
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