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Wiring Up Vct On Rb25, Having Issues.

Rolls

By Rolls,
in Engines & Forced Induction

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Rolls Grand Master

Rolls

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Posted (edited)

So I'm trying to set my eboost street to run the VCT on my RB25DET as it has a auxillary output with window and boost parameters. Now I managed to find a bosch water temp sender plug which is exactly the same as the VCT solenoid plug, wired up some cables to it and tried giving them 12v straight from the battery when it was running to see if it would click over.

How loud is the solenoid as I tried both polarities but couldn't hear any click. I also hard wired it both way and took it for a drive down the street with absolutely no difference.

Just incase I'm wiring up some random sensor instead of the VCT , can someone confirm this is indeed the solenoid? Or is it another water temp sender, as there is one in the mount that goes to the radiator hose that looks identical, however the car obviously runs fine without it plugged in. Running an RB20 ECU atm.

Is on the front of the head next to the cam cover and sticks out looking like this:

http://t1.gstatic.com/images?q=tbn:CzIlfyN...90d.jpg&t=1

Or this picture right at the front on the right next to the injector plugs

http://img186.imageshack.us/img186/9606/vctm.jpg

Edited by Rolls
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GTS-t VSPEC Grand Master

GTS-t VSPEC

Posted
Posted
Bump, surely someone has set this up before, I've heard of lots of people using MSD switches etc. Any help would be very much appreciated.

I've got the MSD switch in mine, I could take some pics if that would help, but I didn't wire it in myself.

Rolls Grand Master

Rolls

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  • Author
Posted (edited)
I've got the MSD switch in mine, I could take some pics if that would help, but I didn't wire it in myself.

Yeah if you could take a pictures of where it is wired to, also if you could open the bonnet and give it a rev, see if there is an audiable click when it switches on/off, that would be a big help.

Could be that I wired it up correctly but it just doesn't make any noise and without a tune the difference isn't that noticeable, just don't want to damage the solenoid by wiring it up wron, can't really imagine how though, its just a simple inductor.

Edited by Rolls
Rapidflow Collaborator

Rapidflow

Posted
Posted

thats the solenoid, don't need the car running for it to energize.

wire up a neg and pos and it should click. not sure on which way the polarity is on the plug but it won't work if its the wrong way.

pretty sure the eboost is a neg switch so power up one side of the solenoid and switch it to ground with the eboost at your desired rpm.

cheers

Rolls Grand Master

Rolls

Posted
  • Author
Posted (edited)

Yeah I was just wiring it directly to the battery for testing, will set up the eboost with a relay so that I can get the polarity correct. I'll give it a go with the engine off, should make it easier to hear, hope it isn't stuffed.

Can anyone confirm that the location in the pictures is correct?

Edited by Rolls
  • 2 weeks later...
Rolls Grand Master

Rolls

Posted
  • Author
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Turns out the solenoid was all gummed up, when the car was getting tuned this week the tuner pulled it out and gave it a good clean then rapidly energised and denergised it a few times to loosen it up. Wired it up to my eboost street to turn it on between 1500 and 4500rpm and it gives a solid 12kw and 15nm gain across almost the entire midrange!

Certainly a cheap and easy way to get it going for people who are running an R32 computer, eboost streets tend to go for around $400 brand new, decent boost controller as well.

  • 1 month later...
Rolls Grand Master

Rolls

Posted
  • Author
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Don't have a working multimeter so can't confirm the current draw, just use a relay if in doubt and that way you will have no issues, only something like 10 or 20 ms lag switching on a relay so no issues there.

fair sure the part is a bosch water temp sender plug, any auto electrician should stock it as it is a common part, just ask to try it then and there, cost me $20 as it is a fairly fancy plug with retainer clip.

  • 9 months later...
Mattw_83 Community Regular

Mattw_83

Posted
Posted (edited)

Turns out the solenoid was all gummed up, when the car was getting tuned this week the tuner pulled it out and gave it a good clean then rapidly energised and denergised it a few times to loosen it up. Wired it up to my eboost street to turn it on between 1500 and 4500rpm and it gives a solid 12kw and 15nm gain across almost the entire midrange!

Certainly a cheap and easy way to get it going for people who are running an R32 computer, eboost streets tend to go for around $400 brand new, decent boost controller as well.

For the mechanically retarded where could i take my car to have this VCT sorted? Autoelectrician?

(Ive got r32 ecu and eboost street in an r33 Gts25t s2)

Or is this something thats relatively easy for a mechanic?

im in sydney.

Edited by Mattw_83
Rolls Grand Master

Rolls

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Honestly any even borderline incompetent auto elect could do this, assuming eboost is already wired up you need to find power and ground, a relay and run two wires to the VCT solenoid, read the eboost instructions to enter in the window rpm range./

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