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Rb25De+T Not Running Right

zacc80

By zacc80,
in Engines & Forced Induction

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HR32GTS 4DOOR Community Regular

HR32GTS 4DOOR

Posted
Posted (edited)

ohh ok i understand now, so pretty much use the 20 loom and ignitor with a 25 injector loom, and everything else should be sweet to plug in and run, eliminating any faulty wiring ? also how would i go about hooking up the vct to the ecu ?

Yeah get yourself an rb25 injector loom, cut off the plugs and solder them onto the rb20 loom. then with the VCT run a wire from pin 113 to the ground of the VCT solenoid (the ecu grounds the solenoid) then run a wire from a switched +12V source to the other pin. Make sure you test which pin on the solenoid is ground and power or it wont work. The plug for the VCT is the same used on an N15 pulsar with VCT so they are pretty easy to find. All other plugs SHOULD be the same unless someone has tampered with it.

Also two wires on the ecu need to be swapped around.

Pin 112 and 114 need to be swapped. These are the injector trigger for 4 and 6.

Edited by HR32GTS 4DOOR
zacc80 Rookie

zacc80

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ok cheers for that, so really the resistor packs installed in my loom shouldnt be there becuase standard purple 25det injectors are high impededence and the ecu is also high so these resistors is mostlikely the cause of my motor running crap ?

HR32GTS 4DOOR Community Regular

HR32GTS 4DOOR

Posted
Posted

No it shouldn't be there, but I don't know if it would make your motor run bad or not.

This is for the injector plugs.

http://www.jdmlegion.com/Projects/R32%20Skyline%20GTSt/RB25-conversion-Stage-16---Wiring-the-injectors-491fdbae-99d1-4448-a9cb-1b785054da59

zacc80 Rookie

zacc80

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so i put my multimeter on and the resistance was under 1 ohm so they must not be standard injectors, i did find that a bolt on the cas was snapped so it could be a timing issue, but it seems to run quite rich can smell fuel and backfiring a bit and has a few flames blowing out exhaust, now im wondering if the injectors could be bigger and it putting through too much fuel maybe ?

HR32GTS 4DOOR Community Regular

HR32GTS 4DOOR

Posted
Posted

so i put my multimeter on and the resistance was under 1 ohm so they must not be standard injectors, i did find that a bolt on the cas was snapped so it could be a timing issue, but it seems to run quite rich can smell fuel and backfiring a bit and has a few flames blowing out exhaust, now im wondering if the injectors could be bigger and it putting through too much fuel maybe ?

Ok so the injectors are most likely bigger than factory. If you can afford it, get a tuneable ecu and take it to a good tuner, they should be able to sort it out.

Cheaper option would be to grab some standard injectors and swap them out.

Can you pull one injector out and tell us the numbers on it and the colour? Or take a photo.

zacc80 Rookie

zacc80

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Thought id let you all know that i rewired the car, and is running good now, just need to adjust idle, and when driving if you foot flat accelerate it will cut out once hits full boost, i have no boost tap or anything so could it be a leak ?

HR32GTS 4DOOR Community Regular

HR32GTS 4DOOR

Posted
Posted

Thought id let you all know that i rewired the car, and is running good now, just need to adjust idle, and when driving if you foot flat accelerate it will cut out once hits full boost, i have no boost tap or anything so could it be a leak ?

It's most likely the fact that you have non standard injectors with a factory ECU

zacc80 Rookie

zacc80

Posted
  • Author
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ended up being one of the injectors was stuffed and constantly dripping out fuel causing the rough idle, not revving out etc, put a new injector in and runs sweet, anyone know what a 25 plus t can handle with standard everything, am looking into a bigger turbo, wastegate etc but not sure how they handle it

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