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R32 Rb25 Conversion

1400r

By 1400r,
in Engines & Forced Induction

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1400r Veteran

1400r

Posted
Posted

Hi guys my 25'd 32 is up and running now

I have a few things to tidy up with the wiring

1. The Aircon Simon did the wiring for me and his aircon works, well it just works so Im guessing not as well as it use to

with mine nothing happens it seems like the aircon fans not switching on and theres no drop in

idle so I dont think the compressors turning on either.

Ive heard (not in detail) that 33's run a extra temp sensor, can someone confirm in detail how this is done and if it works.

Im kinda bummed because I went to the trouble of reusing the rb20 air con compressor and keeping all the lines connected so I wouldnt have to get it regassed

that and its 40 degress outside.

2. The car doesnt seem to like to cold start at all, I have to pump the throttle to get it to fire up and then to get it to "clear" its throat

my car currently has a rb20 o2 sensor fitted and a s14 purple plug unit thing (near the inlet plenum) sorry not sure what it is but my 25 one was stuffed

Im not sure if these would affect cold start or if there's some wiring that needs to be done

sorry to post it in this section but I think this is the best place to get a responce

Thanks :P

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blind_elk Grand Master

blind_elk

Posted
Posted

An O2 sensor is an O2 sensor. They all work the same way (basically). It shouldn't matter if it's for a RB20 or a RB25.

As for your starting problems, check the cold start air valve, under the inlet plenum.

The A/C problem was covered about 2 weeks ago. Have a search.

BHDave Grand Master

BHDave

Posted
Posted

you are :( there's no difference. mine ran with an rb20 one up until recently when i decided it was getting old and swapped it for a generic one

Which fan are you talking about? the secondary one on the front or the internal one? If its the internal one you have issues as that should work regardless of whether the engine loom is installed or not.

re the ac wiring. if the idle isn't stepping up then the ecu doesn't know the ac is being switched on. It will step up regardless of whether the second solenoid on the IACV is connected or not. If the compressor isn't switching on it's because the ecu isn't telling it to switch on (1) because it doesn't know it's supposed to, and maybe (2) because it hasn't been connected into the body loom up near the air box. The secondary fan is also tied up to this so will work once it gets the signal.

re the start up issues. check your earths, check the auxiliary air valve has power (though that won't make a heap of difference to start up, just cold return to idle stalling could be a problem) check that the water temp sensor is connected and working properly (im guessing thats the s14 one that you plugged in. bin it and get the right one)

1400r Veteran

1400r

Posted
  • Author
Posted

^ internal one

cant get the fan no aircon to come on either

so I dont need to add another temp sensor somewhere

just had a quick search to couldn't find anything with the info I wanted

this is the part Im talking about

(note this is my part refitted to the s14 engine I borrowed the s14 part from

as you can see the plugs stuffed)

post-15018-1199486639_thumb.jpg

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