Today, my custom tailored S&J Safeguard Vampire has arrived.
For details, go there: J&S Vampire
All pre-89' Turbos are missing several key engine management systems, like reliable boost controller, ECU, electronic spark management and anti-knock protection. Consequences of that may be dire, see my post #68
. All of that, including a crude anti-knock processor was implemented in 1989 MY, when Delco Engine Management system/ECU was introduced.
On 84-88 Esprit turbos equipped with OE Lucas Hi-Energy Ignition, a single channel Vampire should work fine, but to be on the safe (modern) side, an upgrade to Pertronix Ignitor pick-up and Flame Thrower Coil would be a prudent precaution.
If one decides to graft-in a Megajolt-E and Ford EDIS (wasted spark, dual coil) ignition system, the Dual Channel processor is required. Megajolt/E | Autosport Labs
Normally, the Vampire is disabled below 1750 RPM, because Ford ECU fires triple spark(s) below this rpm threshold and confuses the processor.
Since you’ll be using Pertronix or Megajolt-E, the Vampire should be modified to enable detection at 1250 RPM and sensitivity should be amplified a little bit for our engines . Parts needed: 8mm ID Bosch"doughnut" knock sensor and a 15 ft sensor cable, gauge with 5 ft cable; all included in the kit. John at J&S will take a good care of that.
In addition, one needs to make an aluminum “boss” with M8 threaded hole and epoxy it to the block between cyl 3 & 4, just above the oil sender unit, at the same location where the later SE car Delco ECU listens to the engine knock.
Delco ECU retards all cylinders
upon detecting a knock in any one cylinder, therefore robbing the power from other cylinders.
The SafeGuard Vampire controls the timing of each individual cylinder
in proportion to the degree of detonation occurring, thus maximizing performance and preventing engine damage.
Vampire has a dual mode switch and retards only the individual knocking suspect, or “retard all”. Also, it has a 2° and 4° Nitrous Retard setting/switch.
MSD coil PN 8241 can be safely used in place of the OEM EDIS coil with excellent results. Avoid any aftermarket "hi performance" coils which look like fluted factory chimney stacks (junk!).
Using a single knock sensor, Vampire detects the onset of detonation and retards the timing on a "per cylinder basis", up to a total of ten increments.
A mode switch lets you select a maximum of either ten degrees or twenty degrees of knock retard.
In the ten degree range, each increment is one degree; double that for the twenty degree range.
When knock is detected, software determines knock intensity and decides how many increments to retard this cylinder the next time it fires.
The software retards in proportion to the knock event, up to a maximum of seven steps with one knock event.
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; double that in the twenty degree mode.
The system does not need a cam or crankshaft reference sensor 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 detection algorithm employs a "knock window" to listen for knock at the appropriate time in the combustion cycle.
Details to follow...