Manual DS4/ 4l80e

[greenmeanh1]

Anyone ever come up with a manual control system for the DS4 pump and the 4l80e transmission effectively bypassing the computer?? Further more, anybody done it on the fly along with time setting?? Anyway thought i would ask!!
It hit me when i was fixing an automated audio mixing board today at the studio and begs this question. Why is it we need a computer to run our electronic trucks??
I think there may be another way.
I look forward to the responses on this!!

 

[Will L.]

For manual control it is easier ( and cheaper) to just go db2. My95 is factory db2, 4 l80e.

What all would you want to keep/ eliminate of the ds4. It's big advantages is everything that goes through the computer.

Have you read about Bobbie Martin - his ds4- db2 conversion?

 

[greenmeanh1]

Yeah i know about all that but this is different. This would be using the stock ds4 without a pmd and a computer and replacing them with mechanical triggers. Aside from emmisions and bi directional comunication like OBD i think the truck could be run and timed/tuned without the stock computer. You would still need some electronics to make it work but minimal stuff like a few stepping motors and some relays resistors and potentiometers and perhaps a signal generator.
In fact the stock computer could still be used to provide some sensor data but we would be bypassing the APP CPS PMD and not using the regenerated high and low rez signals from the optical encoder but using the signals directly from the optical encoder to drive a voltage controlled servo which output is set by your foot APP posistion. 2 stepping motors staticly mounted to the sepetine belt drive system would provide even higher anolouge rez signals than the existing computer/ OE provides now which is 512/64 steps in the injection cycle. The step resolution would be in the order of 65536/8192 timing steps with the step motors on the serpetine belt picking up the signals. These phased signals feed a voltage controlled servo The servo would feed the poppet trigger on the rear of the IP. Timing would be adjustable by offset the step moter output using a nandgate controlled by potentiometer on the fly. About as simple as it gets!!

 

[THEFERMANATOR]

To run the DS4 pump, you MUST run a FSD/PMD. The DS4 pump works via a high speed solenoid in the end of it that triggers it to inject fuel(basically the solenoid pulses to move the internal plunger which in turn takes the place of the older throttle cable control). You would have to use some sort of driver to have the necessary power needed to pulse the solenoid, in other words a FSD of some sorts. And then you would have to have a way to control the stepper for timing as well as trigger the FSD for the pump. In other words, you would need some sort of control module or an ECM of some sorts. There is no way around it, to run a DS4 pump, you have to have electronic controls. Some have tried using a potentiometer to drive a pulse controller to control them without an ECM, but most of these have ended BADLY with runaways.

 

[Will L.]

Seems to me going the the ECM is never a proboblem, failure rate is low. Pmd/fsd however is a psychotic nightmare. Electrically controlled fuel running away could be covered by the mechanical emergency air flow safety like the ones used in petroleum industry. Then you could test without fear of donating conncting rods to your tires.

 

[great white]

Its called a db4.