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Rb20Det Into Vp Commodore

GTS 221

By GTS 221,
in Engines & Forced Induction

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trustr32 Rising Star

trustr32

Posted
Posted

Not the best with the electrical side of things but sounds like you should get a new relay and try that they're only $15-$20 for a 30amp horn relay. It should be normally open which means no circuit until the switching wire(from the ECU) triggers it to form the circuit. hook it up the way it's been explained and that'll tell you whether thats the problem. It's now a process of elimintaion so write a list of things to check and cross each one off when you've checked it.

paul_psi Collaborator

paul_psi

Posted
Posted

this is what I did in my skyline

scrap all the standard fuel pump wiring and start from scratch go to jaycar (car electronics place) get a 5 pin horn relay, 30amp in line fuse, 25amp positive and negative wire(black and red I only needed a meter of each my battery is in the boot you'll need maybe 5or6 red cable and a meter black) and just tools for the job solder and iron ect

run a wire (25amp red) from the battery (positive) and put the inline 30amp fuse along the way somewhere then conect this wire to pin 30

pin 85 earth out to the body(or negitive on the battery)

pin 86 conect to an ignition only source (key barell, head deck ect)

pin 87 straight to fuel pump positive connection

negitive connection on pump you can ground it out to same place as the relay

this is basically the setup I'm running with a walbro and 2 044 they switch and run beautiful hope this helps

paul_psi Collaborator

paul_psi

Posted
Posted

Ok cheers for the info, sounds like this is the way to go. Fingers crossed it solves my problem... cars huh :P

and when you get the relay ask for a wiring harness for it makes it a lot easier it cost me about $50 all up including a new soldering iron. car are a love and hate relationship

ARTZ Grand Master

ARTZ

Posted
Posted

this is what I did in my skyline

scrap all the standard fuel pump wiring and start from scratch go to jaycar (car electronics place) get a 5 pin horn relay, 30amp in line fuse, 25amp positive and negative wire(black and red I only needed a meter of each my battery is in the boot you'll need maybe 5or6 red cable and a meter black) and just tools for the job solder and iron ect

run a wire (25amp red) from the battery (positive) and put the inline 30amp fuse along the way somewhere then conect this wire to pin 30

pin 85 earth out to the body(or negitive on the battery)

pin 86 conect to an ignition only source (key barell, head deck ect)

pin 87 straight to fuel pump positive connection

negitive connection on pump you can ground it out to same place as the relay

this is basically the setup I'm running with a walbro and 2 044 they switch and run beautiful hope this helps

yeah thats what im thinking...just hardwire it from scratch...

GTS 221 Rookie

GTS 221

Posted
  • Author
Posted (edited)

Correct me if im wrong BUT doesnt blue smoke generally indicate the engine burning excessive oil or oil entering your exhaust e.g blown turbo

Correct.. being second hand I have no idea what condition the turbo/engine is in.. is on the cards to inspect inside

Edited by GTS 221
paul_psi Collaborator

paul_psi

Posted
Posted

that's the love of cars mate you need to research look up stuff on google go to the local mechanic shop ask questions. I'm a bricklayer by trade and now try to go everything on my cars even tort myself to aliminium weld to get stuff done. my advise try it yourself if you stuff up you will learn by your mistakes

jiffo Mentor

jiffo

Posted
Posted

A quick check of the Commo wiring diagram shows its fuel pump relay is a positive trigger from the ecu, Skyline (pin 18) is negative.

Multi meter will soon sort out the problem and another relay.

Commo also has the oil pressure switch fuel pump safety cut out, so that circuitry should also be investigated.

If you want a legal and safe conversion, you never run a fuel pump without some sort of safety cut out.

RRob Community Regular

RRob

Posted
Posted (edited)

85 connect to ign 12v switched

86 connect to pin 18 on the ECU header or ECU fuel pump output

30 is a fused power supply from the battery

87 is wired to the positive side of the pump

This is the correct safe way of doing it.

Edited by RRob
Siggy180 Contributor

Siggy180

Posted
Posted

Correct.. being second hand I have no idea what condition the turbo/engine is in.. is on the cards to inspect inside

Are you from Melbourne/did you buy the original RB/VP from a guy from Sydney? If so the car belonged to someone I knew, and wasn't treated very best. Ran on 5 cylinders a lot (bad AFM), never serviced, etc. After the car was written off, he did a few burnouts on the lawn (cold motor). Not trying to upset anyone, but yeah. Worth putting new rings and bearings in at least.

And for the haters - fantastic sleeper. Boring white VP commodore combined with ZUTUTU. I wouldn't do it myself, but it sorta opened my eyes...

  • 1 year later...

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