Jonathan Posted March 18, 2004 Report Share Posted March 18, 2004 I am curious what to hook the power up to with my SDS system. I planned on doing this. Power for SDS computer from Wiper power wire. Injector power to positive coil wire. Is this ok? Jonathan Link to comment Share on other sites More sharing options...
Chad Posted March 18, 2004 Report Share Posted March 18, 2004 Why not use the stock ECU power? It is a large gage wire and it won't be running any other systems when you convert. If you tie into another system, it will draw the power down to an unacceptable level when both systems are in use. If you can, it would be best to connect direct to the battery (with an inline fuse ofcourse). Link to comment Share on other sites More sharing options...
Boosted_One Posted March 18, 2004 Report Share Posted March 18, 2004 I hook up to the stock ECU power line. I don't think the wiper power will work, you need a power source that is constant while cranking otherwise the car will never start. Link to comment Share on other sites More sharing options...
Jonathan Posted March 18, 2004 Author Report Share Posted March 18, 2004 Could I just connect both the the Coil? If I connect it to the batter directly with a fuse it will be on all the time. Jonathan Link to comment Share on other sites More sharing options...
Boosted_One Posted March 18, 2004 Report Share Posted March 18, 2004 I never fire anything off of the coil. That's a no no in my personal book. I never want to drop any power from the coil in any way... If I am not mistaken I fire my injectors off the battery and I know for certain my SDS runs off my stock ECU power wire. Link to comment Share on other sites More sharing options...
WTFISIT Posted March 18, 2004 Report Share Posted March 18, 2004 I think it's a bad idea to pull the power from the coil. I think it could be bad for sensitive electronics. I've never scoped it, but I believe that it can be the source of some high voltage noise. Link to comment Share on other sites More sharing options...
Jonathan Posted March 18, 2004 Author Report Share Posted March 18, 2004 My problem is I am still using the factory ECU. I have the SDS D system and its only running the fuel not ignition. The ecu is controlling everything else. Will I drain my battery if I attach them straight to the battery? Jonathan Link to comment Share on other sites More sharing options...
WTFISIT Posted March 18, 2004 Report Share Posted March 18, 2004 I'm planning to trigger a relay from the fuel pump line and run my SDS and WB 02 sensor off the relay. Or, maybe I'll just tap the relay off the stock ECU power. Haven't got that far yet. Link to comment Share on other sites More sharing options...
Boosted_One Posted March 19, 2004 Report Share Posted March 19, 2004 My problem is I am still using the factory ECU. I have the SDS D system and its only running the fuel not ignition. The ecu is controlling everything else. Will I drain my battery if I attach them straight to the battery? Jonathan Your ECU is of no use with an aftermarket fuel ECU. ECU doesn't control timing anyhow our timing is mechanical with a mechanical retard and back up retard device (ignitor). So in other words you don't need the stock ECU in. Link to comment Share on other sites More sharing options...
artinist Posted March 19, 2004 Report Share Posted March 19, 2004 My TECII is currently using the coil + as a switched power. i am going to switch over to the wiper motor tomorrow. you cant use the power from the stock fuel pump wire to trigger a relay. if you are not using the stock system, i dont think anything will power the fuel pump in the first place. the fuel pump should be rewired with a descent gauge wire and relay. Link to comment Share on other sites More sharing options...
Joel Posted March 20, 2004 Report Share Posted March 20, 2004 I believe the best way to do it is the same way your ECU got its power... From the ignition harness. That is how I set them all up on any car I've installed an ECU in. Joel Link to comment Share on other sites More sharing options...
Boosted_One Posted March 20, 2004 Report Share Posted March 20, 2004 I believe the best way to do it is the same way your ECU got its power... From the ignition harness. Â That is how I set them all up on any car I've installed an ECU in. Joel agreed Link to comment Share on other sites More sharing options...
pinale69 Posted March 21, 2004 Report Share Posted March 21, 2004 I powered my sds off my ecu power (big blue wire) and connected my injectors and coilpacks ( I have the F) strait to the battery, you want them to have that constant solid source, and unless the ecu is getting power the injectors aren't grounded and aren't pulling any power. Make sure to put an inline fuse between the injectos and battery and a 1 amp between the ecu and its power. BTW, I got the ecu power from the blue wire where it goes to the ecu and I used one of those clip 3 way things so that my factory wiring would be undamaged. I had a hell of a time finding the fuel pump wire, so I just put 12v in where the test leed is in the pass. side fender. good luck. Danny Link to comment Share on other sites More sharing options...
artinist Posted March 23, 2004 Report Share Posted March 23, 2004 i think i will do the same. i dont know what i was thinking with the wiper motor thing. that comes on with accessories, not ignition. Link to comment Share on other sites More sharing options...
Joel Posted March 23, 2004 Report Share Posted March 23, 2004 I'd suggest doing it right, or you'll do it twice. Wiring is definately not something you wanna get stranded by. Joel Link to comment Share on other sites More sharing options...
DJ_Lazarek Posted April 11, 2004 Report Share Posted April 11, 2004 Whats wrong with stock ECU power? Or Power off Ignition? DJ Link to comment Share on other sites More sharing options...
Boosted_One Posted April 11, 2004 Report Share Posted April 11, 2004 Whats wrong with stock ECU power? Or Power off Ignition? DJ DJ.... stock ECU is a good source.... basically you just want a 12V always on source that will power while cranking the vehicle. There were a few talking about running thew power wire off of the coil and other sources that may not be active 12V all the time. The stock ECU is a prime source because it is an active 12V source and obviously originally intended to do the same thing, power the ECU. Link to comment Share on other sites More sharing options...
artinist Posted April 11, 2004 Report Share Posted April 11, 2004 i switched from the coil to the ECU as my trigger for the ECU relay. works great and makes wiring nice since my ecu is in the glovebox. Link to comment Share on other sites More sharing options...
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