GutlessSupreme Posted October 29, 2006 Report Share Posted October 29, 2006 Alright, this is a little technical and I'm not sure how to work through it. I bought a switch from a Volvo 850 on ebay. It's a perfomance tranny switch, with a rocker switch for ECON/SPORT, and a momentary contact button for WINTER. It also has two LEDs labeled E and S. Basically, what I want to do is have three levels of boost for the STE. http://www.volvoclub.org.uk/tech/service/850/SystemWiringDiagrams.pdf (~2MB) Page 51, in the top right corner is the "Automatic Transmission Program Selector." That's my switch. 1 ground and 3 wires to the PCM. Now hooking up the first two boost controller valves, for ECON/SPORT is pretty straight forward for the rocker switch. My main question there is, should I use a relay? I plan on using a few stock TGP boost control valves, I don't know if the switch itself should have less than 12 volts going through it. Also, I don't know how to use relays, so if anybody could come up with a rough diagram of how it'd be wired, that would kind of help. I think I know, but I'm not positive. My other, bigger question is about hooking up a third valve to the WINTER switch. Since it's only a momentary switch, how can I keep the relay/switch grounded after my finger's off the button? I plan on using two grainger valves for lower boost (WINTER) and and just a little bit lower boost (ECON). SPORT would probably go through the stock solenoid and just be controlled by the PCM, through Invision1's chip he made for me. I may make SPORT go higher instead, I don't know, I'll have to figure out what's safe when I actually get to that point. Each appropriate valve would open/close as I ground/unground them, directing the airflow to the appropriately set grainger valve. Quote Link to comment Share on other sites More sharing options...
GutlessSupreme Posted October 29, 2006 Author Report Share Posted October 29, 2006 I didn't see a problem with this being in General, as it's just a wiring question... but whatevs I guess. no biggy. Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted October 29, 2006 Report Share Posted October 29, 2006 I didn't see a problem with this being in General, as it's just a wiring question... but whatevs I guess. no biggy. it's a wiring question that obviously has to do with performance though. if it was a wiring question about HUD for example i would have left it. Quote Link to comment Share on other sites More sharing options...
97loudcut Posted October 29, 2006 Report Share Posted October 29, 2006 I kow this is no help to you, but this idea sounds sweet as hell! Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted October 29, 2006 Report Share Posted October 29, 2006 For the momentary winter switch, just use a relay to act as a latch. Press winter button, activate relay. Press Winter button again to deactivate the relay. This sounds like a very cool idea. Quote Link to comment Share on other sites More sharing options...
GutlessSupreme Posted October 29, 2006 Author Report Share Posted October 29, 2006 it's a wiring question that obviously has to do with performance though. if it was a wiring question about HUD for example i would have left it. fair enough For the momentary winter switch, just use a relay to act as a latch. Press winter button, activate relay. Press Winter button again to deactivate the relay. This sounds like a very cool idea. See that's where I don't know how relay's work. Do they just need the initial "trigger" ground to stay closed? Not a constant ground? Or do they make both? thanks for the input Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted October 29, 2006 Report Share Posted October 29, 2006 They just need the initial trigger to stay closed. Usually, pressing the trigger again will deactivate it. However, I'm sure there are different kinds/types of relays. Might just look around and see what types you can find, and find the right one for your application. Quote Link to comment Share on other sites More sharing options...
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