i asked Xspeed if t could be done and this is what they said
With regards to the engine conversion, the RB25DET should fit into the GTS-4 (i presume this is with the RB20DE motor in it). We will have to change over the sump from your current motor to the RB25DET to accommodate the front diff. Other than this, i will think that it is a straight swap.
Only problem i can see with this conversion is with the wiring. Looking at my wiring diagrams here, the RS4 ECU is similar to the R34 GT-T, not the 33s. However, if your GTS-4 is equipped with a RB25DE, the ECU of a RB25DET of the same year model (8/93~12/95, or 1/96~4/98) looks like it will fit striaght onto the loom of the RB25DE, as they share the same ECU plug.
(2nd reply)The straight swap means that an RB25DET out of a R33 Skyline would fit straight into your engine bay without having to modify any engine mounts and brackets etc. If you get a R33 GTS-T 1/2 cut, all the parts that are necessay to do the conversion will be in it.
To do the conversion including the 1/2 cut, you will be looking in the vacinity of the 5-6k mark. This will include the 1/2 cut (should be between $3-4k), labour, including wiring, fluids etc ($1.5k) and new fuel pump ($380).
an i was told the same by cypher industries... i’ll admit they said they have never done one be4 so it’s almost certain that it won’t all go to plan and it will cost more but xspeed an cypher aren’t really any old "BOB the machanic" are they???
Pva_ glue, how did u find out about the "G-sensor" and the torque split of ATTESSA??