DDEC II, DDEC III, DDEC IV,First a little historyThe D/D DDEC TURBO BOOT SENSOR old part#--- 16070629new part#- 23528418is a 3 pin solid state IC device pin A = Sensor Return pin B = Signal Linepin C = +5 volt supply linepin B - operating range - approx .5v to 4.75 - voltages outside this range will cause a DDEC Faultexamplepin B @ 1.00 volts = approx 00 PSI Boostpin B @ 2.25 volts = approx 10 PSI Boostpin B @ 3.80 vollts = approx 20 PSI Boost <>The PROLINK was used to verify the correct action of Bill's TBS without the modifications<>Bill came up with a unique solution - A 100 ohm resistor between pin B (sense line) and C (+5 volts) - will pull up the voltage at the sense line (pin B) to what would be an approx 4-5 psi boost voltage level (as measured/verified with the PROLINK)<>AS the actual boost pressure increases past 5 or 6 PSI the pull-up effect goes away - allowing normal TBS voltage levels<>AT full boost the pull-up resistor has no effect <>The net result is that the DDEC thinks that there's is a little boost pressure available at IDLE and allows for more fuel to bedelivered to the injectors upon acceleration
I picked up a potentiometer and some additional 150 and 220 ohm resistors yesterday. I'll try some additional testing this week. Per Greg Peterson, I am also wondering what the additional amperage is doing to the circuit. Has anyone run this way for an extended period of time? It would be nice to know someone has 200K miles on this mod and no problems:-)
RichActually the added resistor is in sort of a parrallel configuration - at worst case it could add 50 milliamp additional load to the 5v sensor supply line - thats 1/20 of an amp you guys decide for ourselves - Pete RTS/Daytona