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Just easy kinda things heres some parts info RE RB25det
Clutch kit = Z32 N/A
Throwout bearing = will work for z31 turbo, some others work too.
Coil Packs = Z32
Nismo Thermostat = Same as z32/ xterra, all 6 cyl
Nismo FPR (Highly recommended on all cars with walbros, fuel pressure is too high causes super richness) = 22670-RR580US (same as SR20det model)
Maf = Same as J30 maf on series 1!?, any z32 filter will adapt to the maf, but the plug is the main concern.
other info that is good
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Make sure you change your waterpump, and timing belt before you swap, who knows how many miles your engine has, its better now then when it shits out on you and you have to do it from inside.
S14 can use tach and speedo, as well as coolant temp gauge (must swap in KA coolant temp sensor into RB temp sensor location.) It reads a little bit faster on warm up, but is accurate thereafter. To use the tach correctly, recalibrate it using the adjustment screw on the back of the gauge cluster, you need something else to read your RPMs to calibrate it correctly. Remember rb is 6 cyl vs 4 cyl, so tach will read 1.5 too much. I.e. 2000 rpms reads as 3000 rpms on your tach.
Lower harness:
Use your KA lower harness. You will have to cut off the starter plug and rewire it inplace of the Ka start plug (spade plug). You willneed to cut off the KA oil pressure sender, replace with the rb one. Starter loops that you secure on with 10/12 mm bolts, you may have to ream the inside or replace the loop that is secured with the bolts. Everything else pretty much works. Also extend the KA tranny harnesses , some plug up, those that don't make sure you splice them with the correct plug from the KA harness.
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