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FS: J & S Safeguard individual cylinder knock control
Jun 19, 2007, 11:56 AM
#1
FS: J & S Safeguard individual cylinder knock control
Actual photo.
Using a single knock sensor, the system detects the onset of detonation and retards the timing on a per cylinder basis. A mode switch lets you select a maximum of either ten degrees or twenty degrees of knock retard. In the ten degree range, the unit retards one, two, or three degrees per ping. Double that for the twenty degree range. The system is always trying to re-advance to stock timing. In the ten degree mode, it re-advances at the rate of one degree every twenty revolutions.
The system does not need a cam or crankshaft reference to determine which cylinder to retard. The unit is programmed to "know" that the knocking cylinder is the one that just fired, and that it won't fire again for two more revolutions. When the knocking cylinder comes around to fire again, software dials in the retard amount for that cylinder. It does this as each cylinder goes by, building up a different retard amount for each cylinder.
The unit has a high energy ignition with constant energy dwell controller. The system monitors the coil current, and adjusts the dwell time to achieve seven amps of coil current. Compared to a GM HEI, this is a 62% increase in energy stored in the coil. The system can also be used to trigger an MSD.
Standard automotive units are also available for single coil foreign and domestic vehicles as well as multiple coil applications, including Honda, Miata, Subaru, Eclipse, Toyota.
Unit goes for $564 new.
Fits 2 1/16" (52mm) gauge pod Instructions
A built-in light sensor dims the display automatically at night, and increases brightness in direct sunlight.
A ten segment bargraph display shows amount of retard, and thus gives an indication of the engine's tendency to knock at any particular time. The monitor is conected to the J&S SafeGuard with a 3.5 mm stereo cable supplied in the kit. The new SafeGuard units have an onboard LED that glows in proportion to the amount of knock retard. This will assist you in setup of the SafeGuard, but the bargraph gives much more information.
The display shows how much tiiming is being taken out by the SafeGuard. When the SafeGuard is set for 20° control range, each LED is worth 2°. If the SafeGuard is set for "retard all", and it is taking out say 12° of timing, then you would see the 6th LED on. If the SafeGuard is set for "retard separate", then the display becomes more complex. Since the SafeGuard can retard each cylinder by a separate amount, you will see one LED on for each cylinder that is being retarded, and the position of that LED indicates how far. For example, let's say that one cylinder is retarded 4°, another 6°, and another 8°, then you would see the 2nd, 3rd, and 4th LEDs on.
The ten segment LED (GGGYYYYRRR) Air Fuel Display now has a dual resolution feature with a switch that allows accurate tuning for both cruise and full power modes.
The gauge is calibrated for use with a Bosch LSM-11 sensor, operating at 1450°F.
When the switch is in the "Power" mode, the gauge reads between 0.81v and 0.90v, so it may be used with any standard O2 sensor.
Unit goes for $179 new.
Best offer on both parts will be taken.
Last edited by TTP Engineering; Jun 20, 2007 at 07:55 AM.
Jun 20, 2007, 07:51 AM
#4
Its the automotive version Mike. I borrowed a pic from the J&S site of the marine version, the only version with a pic I could find. The top pic is of the actual unit.
This was used on a 9.2 @ 156mph Eclipse drag car with a Haltach E6k. It is compatible with many ECU's.
This was used on a 9.2 @ 156mph Eclipse drag car with a Haltach E6k. It is compatible with many ECU's.
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Jul 2, 2007, 08:42 PM
#9
Actual photo.
Using a single knock sensor, the system detects the onset of detonation and retards the timing on a per cylinder basis. A mode switch lets you select a maximum of either ten degrees or twenty degrees of knock retard. In the ten degree range, the unit retards one, two, or three degrees per ping. Double that for the twenty degree range. The system is always trying to re-advance to stock timing. In the ten degree mode, it re-advances at the rate of one degree every twenty revolutions.
The system does not need a cam or crankshaft reference to determine which cylinder to retard. The unit is programmed to "know" that the knocking cylinder is the one that just fired, and that it won't fire again for two more revolutions. When the knocking cylinder comes around to fire again, software dials in the retard amount for that cylinder. It does this as each cylinder goes by, building up a different retard amount for each cylinder.
The unit has a high energy ignition with constant energy dwell controller. The system monitors the coil current, and adjusts the dwell time to achieve seven amps of coil current. Compared to a GM HEI, this is a 62% increase in energy stored in the coil. The system can also be used to trigger an MSD.
Standard automotive units are also available for single coil foreign and domestic vehicles as well as multiple coil applications, including Honda, Miata, Subaru, Eclipse, Toyota.
Unit goes for $564 new.
Fits 2 1/16" (52mm) gauge pod Instructions
A built-in light sensor dims the display automatically at night, and increases brightness in direct sunlight.
A ten segment bargraph display shows amount of retard, and thus gives an indication of the engine's tendency to knock at any particular time. The monitor is conected to the J&S SafeGuard with a 3.5 mm stereo cable supplied in the kit. The new SafeGuard units have an onboard LED that glows in proportion to the amount of knock retard. This will assist you in setup of the SafeGuard, but the bargraph gives much more information.
The display shows how much tiiming is being taken out by the SafeGuard. When the SafeGuard is set for 20° control range, each LED is worth 2°. If the SafeGuard is set for "retard all", and it is taking out say 12° of timing, then you would see the 6th LED on. If the SafeGuard is set for "retard separate", then the display becomes more complex. Since the SafeGuard can retard each cylinder by a separate amount, you will see one LED on for each cylinder that is being retarded, and the position of that LED indicates how far. For example, let's say that one cylinder is retarded 4°, another 6°, and another 8°, then you would see the 2nd, 3rd, and 4th LEDs on.
The ten segment LED (GGGYYYYRRR) Air Fuel Display now has a dual resolution feature with a switch that allows accurate tuning for both cruise and full power modes.
The gauge is calibrated for use with a Bosch LSM-11 sensor, operating at 1450°F.
When the switch is in the "Power" mode, the gauge reads between 0.81v and 0.90v, so it may be used with any standard O2 sensor.
Unit goes for $179 new.
Best offer on both parts will be taken.
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