I would like to build my own DSP5 switch. I assume each position is a different resistance value, correct? What resistance should they be?
This would be difficult, but doable. One way would be to have a set of 5 relays, one for each resistor, and then you could have anything trigger each relay for whichever resistor you wanted. You'd have to make sure you used diodes in the relay trip circuit, otherwise you could definately have issues with feedback. Also, you'd want to make sure that no two relays would be tripped at the same time. The resistance over the contacts in the relays could also become an issue if you were using really poor quality or heavy duty relays.DURAtotheMAX;1605398; said:awesome ross!! I like the launch control thing. One application I can think of using it as when you are not racing is maybe wire in a relay somehow to the reverse lights? One of the annoying things is that the allison has such a low reverse gear that its really hard to back up smoothely if you have bigger than a stock tune, so when the reverse lights go on, it could trigger the launch control mode to severely limit throttle.....or is that not how it works???
Not something I'll try but I was just curious. That is neat you can have the flexibility if you want. I'm with you on the ground connection. Thanks Ross!Flashscan;1628340; said:You can set the tolerance up, you can change the voltage for each DSP position in the calibrations.
As it is now it just need to fall anywhere between the two voltage switch points. So if you have one set for 1.00V and the other for 2.00V then a switch that produces 1.25, 1.39, 1.42, 1.78 etc will work, it's not too critical but you want to give your self some headroom, so have a switch that produces 1.05V might not be a good choice.
This is also why we want to use the GND pin on the ECM and not somewhere in the cab because it eliminates and potential ground differences.