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Old 07-09-13, 23:05   #26
Dinodore
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Join Date: 25-08-13
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I cranked it today and it cranked over smoothly. I didnt mean to crank it for long so it wouldnt start because the intercooler isnt hooked up yet, but I accidentally let it fire for a second and I heard it run for a tiny amount of time Might be onto a winner here
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Old 03-10-13, 17:31   #27
Dinodore
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What size resistor do I need to wire up the tacho signal?
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Old 01-02-16, 16:50   #28
vh 25det
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Quote:
Originally Posted by Ant_man View Post
First thing i need to know is if its a series 1 or series 2 rb25 loom easiest way to tell is by the relays next to the ecu if has 2 its a series 1 if has a single relay its a series 2 loom

If all you want to do is start it with a standard ecu its fairly easy at the body connector under the air cond box connect up these wires

vl rb25
Green - standard fuel pump signal to Black purple strip - fuel pump signal
Fat black red strip - Switch power
Thin black white strip - Constant power
Blue white strip - Switch power

with these wired in at body plug and everything on the rb25 connected such as afm cas etc it will start and run but if you want to wire it in properly here is a short run down.

Alternator, Starter, Etc.:
The easiest way to wire the driver’s side loom is to graft the RB30 loom onto the 25.
Undo all the wires off the RB25 alternator, starter and oil pressure sender.
• Remove all the tape and conduit shielding from the loom and separate the knock sensor wiring from the rest.
• The knock sensors are the two sensors at the top of the block under the intake plenum.
• Remove the RB25 alternator and bolt on the RB30 one.
• Unplug the RB30's driver’s side loom from the car (or RB30 if you kept it attached) and attach it to the RB25's knock sensor wiring. Plug in the alternator and starter motor. You can use the RB25 starter with the RB30 wiring no worries.
• Remove the RB30 oil pressure sender unit from the RB30 block and screw it in place of the one on the RB25. Plug it into the RB30 loom now on the RB25.
• Cover the loom with the conduit wrapping and electrical tape to neaten it up.
• Grab the main earth wire off the RB30 block and put it in place of the one from the RB25.

Fuel Pump
The fuel pump in an R33 is earthed through the ECU.
Series 1 loom
in the foot well plug (long white one ON THE ENGINE LOOM NOT THE CARS DASH\BODY LOOM)
thin white/black - constant 12v
thickish red - ign 12v through a pair of 6A diodes (or one big one making sure the silver bands face the way u want the current to flow) to stop voltage flowing backwards to ground. If you don't use diodes the ignition won't turn off.

Black/red - ign 12v
yellow/blue - tacho, using the pull up circuit already detailed.
Light blue/white - ign 12v, it’s for the vct and 02 sensor
black/purple - fuel pump relay control
Dark blue/black - temp gauge
grey/red - 12v under cranking
There are only two wires needed to make the Engine start now. One needs constant power and the other needs ignition power.
• ECU plugs white wire with black trace. Tap the constant power in to it.
• Thick black wire with red trace (BR). Tap ignition power into this wire.
Now if your fuel pump primes and shuts off after a few seconds you've done it correctly. At this stage the engine should run if everything else is done.

Tachometer
• Find tacho signal wire from the dash plug.
• Coming out of pin 7 on the ECU is a yellow wire with red trace (YR). This is the tacho signal to the ECU. You could splice a wire into this but I'd advice looking in the engine bay and finding a small rounded plug on the afm branch by the passenger strut tower. It has a single wire going into it and a rubber cap on the end. The wire is yellow with blue trace (YL). This is also RPM signal. Attach to tacho signal wire.
• Now you'll need to go grab a 10k resistor. You'll need to splice a wire into wire 49 from the ECU, run it through your resistor, and finally splice it into the tacho signal wire.

hi guys,
sorry to bring up an old thread but i cant find anything else on line about diodes for the ignition to stay off.
i'v recently done a rb25det conversion on my vh commodore. all is good except my ignition is staying on. i tried the 6 amp diodes in the ignition feeds that i ran to the ecu but it didn't fix the problem.
am i missing something simple? i don't have any "thickish red wire" to attach the diodes to as described above.... i tried the diodes in line on both ignition feeds i used, but the problem was still there.
does anyone know the pin out number on the ecu for the circuit they need to be used in?

any help appreciated.
Thanks
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Old 27-09-17, 15:23   #29
Avl30/25
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Hi guys new to the forum just finding as much info as i can as im doing the 30/25 i see alot of info here in the conversion i personally just would like someone to tell me what wire goes where from
Vl blue and white plug and black and purple plug to the rb25det engine harness in the simplest way possible ie vl wire colour trace and name to rb25det colour wire trace cheers
Muchly appreciated
.
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