Rb25Det S1 And S2 Loom Questions.

[jdm32r]

hey guys so i need some expert advise on the whole rb25det s1 and s2 loom and engine differences.

current set up is a rb25de(+)t engine in a r32 4 door running the stock rb20det loom/ and i assume rb20det computer?

this rb25de+t is a vct but vct isn't plugged in cause its a rb20det loom.

Question 1.so i am currently getting a rb25det series 2 engine built and my question is do i need a complete rb25det series 2 loom to run this engine.

or can i get it to run on my current loom?

Question 2. would it work if i used s1 coilpacks on the s2 engine?

Question 3. what are the differences between a series 1 and 2?

Question 4. which is better?

cheers guys.

[Blackkers]

So let me just get this straight. You've got an R33 RB25de engine (with VCT disabled) in an R32 with an rb20det loom and which Ecu? Best checking to be sure mate.

You shouldn't have any issues really other than having to wire up a window switch for VCT. This is majorly important by the way, the car will be 100x nicer to drive with VCT functioning.

About Coilpacks I'm not 100% sure someone else can weigh in.

Good luck

Edit: the difference in s1 and s2 rb25dets is I believe the long nose crank which engages the oil pump fully. Not a deal breaker but if you've got the s1 motor without a crank collar then keep off the limiter

Edited August 12, 2014 by Blackkers

[Bick033]

S1 coil packs require the igniter found on the back of the valley cover.

S2 coil packs have the igniter built in so if using them on a s1 loom the igniter will have to be bypassed.

[Bick033]

And you can use s1 coilpacks on a s2 engine all depends on what loom

[patrickmm10]

Sorry to bring up an old thread but id rather not start a new one. I was given a RB25 loom by a mate to help with a budget 25/30 build and it didn't come with the "external" looms (injector, gearbox and coil pack. not sure if there's another im missing). Are there any ways to tell wether its a S1or2 from just the basic loom? I assume from what has been said above it doesnt actually matter tho. like if i get S1 coils i just have to get the IB and itll plug into the same plug that the S2 coilpack loom would plug into (obviously directly due to not having the external IB). i may not have worded that very well haha so let me know if i need to clear anything up.

cheers

[GTSBoy]

like if i get S1 coils i just have to get the IB and itll plug into the same plug that the S2 coilpack loom would plug into (obviously directly due to not having the external IB).

I wouldn't count on that. I don't think the plugs are the same. The ignition looms ARE different, not just interchangeable parts.

[KiwiRS4T]

If you are doing a budget build you will be wanting an ecu that can be Nistuned. Keep that in mind and get an ecu and loom that will allow this.