James1436215376 Posted September 19, 2006 Report Share Posted September 19, 2006 My engine (in factory form) runs my inlet cam from 0-1700 in a retarded position then from 1700-4700 its 20 degrees advanced, THEN from 4700-6000 its retarded again. Can my LinkPlus achieve this, maybe using drive a and b?? I.E at 1700 drive (a) switches on and activates a relay which in turn supplies 12V to the cam solenoid = 20degrees adv., then at 4700 drive ( switches off, turning off a relay thats in the cam solenoids ground circuit. Is there another way to achive this on/off operation of the solenoid or will my way work. Thanks for any help Quote Link to comment Share on other sites More sharing options...
ashesman Posted September 19, 2006 Report Share Posted September 19, 2006 LinkPlus G2 c an do this using a GP Outout configured for multiple conditions, but as you are talking about Drive A and Drive B, I assume its an early LinkPlus? If that is the case, then you are on the right track with the two relays. Rather than switching the solenoids +12V (as this will probably be supplied in the factory loom), run the solenoids ground wire through a normally closed relay to drive A. Turn drive A on at 1700 RPM. Use drive b to switch the relay on (open the contacts) at 4700 RPM. that will turn the solenoid off. That way you only need one relay and dont have to touch the power supply. Most 5 terminal relays have a normally closed set of contacts labelled 30 and 87a. Quote Link to comment Share on other sites More sharing options...
James1436215376 Posted September 19, 2006 Author Report Share Posted September 19, 2006 Thanks for the quick reply Asley, so I run the solenoids ground through 87a and switching on drive a will ground the solenoid, then by running 12v through the control circuit to drive b having that switch on at 4700 therefore moving the contact off 87a, breaking the solenoids ground circuit. Will this work in reverse, i.e revs going down below 4700 drive b will turn off and drive a turn on?? Quote Link to comment Share on other sites More sharing options...
ashesman Posted September 20, 2006 Report Share Posted September 20, 2006 Yes, it will work on the way back down ... I have done a rough drawing for you but cant attach it for some reason (which I will look into). Send your email address and I will send it direct to you. But to be clear, there is no switching of any 12V supplies. Quote Link to comment Share on other sites More sharing options...
James1436215376 Posted September 21, 2006 Author Report Share Posted September 21, 2006 Yeah that was one point I forgot to ask, are the drives a grounding switch like the fuel pump control etc. email is [email protected], cheers Quote Link to comment Share on other sites More sharing options...
jim bennett Posted September 21, 2006 Report Share Posted September 21, 2006 what kind of engine do you have ,would this be the same for rb25det?what is the gain from retarding are higher rpm,?is it the intake,exhaust or both? Quote Link to comment Share on other sites More sharing options...
James1436215376 Posted September 21, 2006 Author Report Share Posted September 21, 2006 My engine is a 32 valve 5 litre V8 (M119) form a Mercedes sl500, the reason behind the varying intake cams are : 0 to between 1000-2000rpm - retarded = improved idle, improved cylinder scavenging, reduced valve overlap. Between 1000-2000rpm to 4700rpm - advanced = increased torque, reduced waste of intake charge. Above 4700rpm - retarded = intake valves open and close later, improved volumetric efficiency Quote Link to comment Share on other sites More sharing options...
James1436215376 Posted September 22, 2006 Author Report Share Posted September 22, 2006 Got the email thanks Ashley, thats exactly what I drew excpet I had seperate 12V going to the solenoid and 86 on the relay. Quote Link to comment Share on other sites More sharing options...
jim bennett Posted September 22, 2006 Report Share Posted September 22, 2006 i have an rb25det with variable timing solenoid,does anybody know at what rpm it should be activated and deactivated? Quote Link to comment Share on other sites More sharing options...
ashesman Posted September 24, 2006 Report Share Posted September 24, 2006 Have a look at the skyline forum sites like skylines downunder. There is bound to be a spec sheet somewhere. Someone there will know the switch points. Quote Link to comment Share on other sites More sharing options...
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