This sticky has been made to answer all the questions asked on an almost daily basis. This thread will stay locked indefinately and will be added to as needed. If you have something to add, please PM taylor durden and i will add accordingly.
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General Tech Info
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Engine (SR)
-S13 SR OE replacement part number reference list:
Part Part # U.S.-spec source car
Oil filter 15208-53J00 91-94 Sentra SE-R
Fuel Filter 16400-00002 1990-1996 300ZX TT
Upper injector o-ring 16618-53J00 7/95 and newer 300ZX TT (small/upper)
Lower injector o-ring 16618-10V05 7/95 and newer 300ZX TT (big/lower)
SR20DET OE turbo variations:
S13 SR20DET: T-25, 60 trim 56mm BCI-1 compressor, 53.8mm 62 trim T-25 turbine, .64 A/R turbine housing. Journal bearings.
S14 SR20DET: T-28, 60 trim 60 mm BCI-1 compressor in T-04B housing, 62 trim 53.8mm T-25 turbine. .64 A/R turbine housing. Ball bearing center section.
S15 SR20DET: Same as S14, but with Inco turbine wheel (instead of GMR), cast divider wall between turbine discharge and wastegate.
Pulsar GTi-R: T-28, 60 trim 60 mm BCI-1 compressor in standard T-3 housing. 79 trim 53.8mm Inco T-250 turbine wheel .86 A/R turbine housing. Journal bearings.
BB SR20DET: T-25. Basically, the same as the S13 Silvia.
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Engine (Other)
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Non-engine power upgrades
-Exhaust systems are chassis-specific irregardless of engine type. This means S14 exhausts fit both KA and SR engines, for example. The only exception to this rule is that S13 CA18DE(T) exhaust systems do not fit onto SR/KA S13 chassis.
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Suspension
-S13/14 adjustable pillowball upper mounts are interchangeable.
-S13/14 coilovers are not interchangeable.
-S13/14 rear upper arms are interchangeable as long as they are adjustable.
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Brakes
-For variations of the Z32 300ZX 4 piston caliper, please see this site (written by Asad Aboobaker):
http://www.princeton.edu/~asad/zbrakes/
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Transmission/Differential
-For Kaaz/Nismo LSD, VLSD output shafts are required. You need two of the following: LSD output shaft 38220-52F01
-Short shifters are interchangeable b/w S13/14 KA transmission and S13/14 SR transmission.
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Wheels/hubs
-Clearance of wheels for Z32 brake upgrade is entirely dependent on wheel spoke AND wheel design, NOT on offset of wheel.
-Wheel width/offset needed for clearance of coilovers is as follows (disregarding brake clearance):
6" +54 or lower
6.5" +45 or lower
7" +40 or lower
7.5" +34 or lower
8" +30 or lower
8.5" +24 or lower
9" +20 or lower
Please note that this does not take into account variations in offset calculation by manufacturer, or tire sidewall bulge. This list also does not take into account differences in design of coilovers (esp. lower brackets on coilover kits which can cause changes in wheel clearance issues). This list also only applies to the FRONT WHEELS and is intended as a GUIDE for reference.
-The LARGEST wheels that will fit the front of a S13/14 with stock fenders is 9" wide. The rear can take up to 10.5" wide with a very specific offset AND must dial in negative camber. To fit large wheels one must use negative camber to ensure proper fender clearance.
Hub
-S13 uses 30mm front hub bolt, S14 uses 32mm front hub bolt. Both chassis uses 36mm rear hub bolt.
-Conversion to 5 lug on S13 chassis requires S14SE/Z32nonturbo rear hubs, and either 1) JDM aftermarket front S13 5 lug hubs, or 2) S14 SE front hubs + S14 spindle + S14 ball joint w/LCA (and redrilling of strut for larger strut bolt).
-Conversion to 5 lug on S14 requires S14 SE front hubs and S14SE/Z32nonturbo rear hubs.
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Interior
-S13/14/15 front seats are interchangeable without any modification.
-R32/33/34 front Skyline seats fit S13/14 with a minor modification to one of the holes for the mounting bolts.
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Chassis Info
-S13/14 front strut tower bars are only interchangeable if the length of the strut bar can be adjusted. Rear strut tower bars are not interchangeable.
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Auto to 5 Speed Conversion
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Parts you will need:
5 Speed transmission
5 Speed driveshaft
5 Speed transmission bracket
flywheel
clutch
pilot bushing
clutch pedal assembly
hard clutch line
clutch master cylinder
clutch slave cylinder
you will need to remove the large metal collar inserted in the end of the crankshaft where the torque converter used to sit. install the clutch pilot bushing. you will also need to cut a hole for the clutch master cylinder. the holes are already stenciled out inside the firewall next to the brake pedal assembly. you will also need to take the large grey two wire plug off the auto transmission lower harness and plug it in where it went in the plugs under the fuse box. join the two wires together on the cut plug. this bypasses the automatic nuetral safety switch. for reverse lights, find the two wires on the lower tranny harness that make continuity when the transmission is put in reverse. this should be the black wire and the green wire on the grey multi-wired plug. connect the two wires to the two wires on the switch located on the transmission closest to the bell housing.
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Single Cam to Twin Cam swap
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you will need:
twin cam motor
twin cam motor harness
twin cam ecu
twin cam mafs
twin cam intake pipe
twin cam power steering lines (all)
twin cam heater hoses
custom a/c lines
twin cam gauge cluster
you will need to completely remove all single cam power steering lines and install the twin cam lines; from reservoir to pump. install motor. the twin cam harness will need the brown gauge cluster plug removed and the white single cam cluster plug put on in its place. just match colors. those that dont match; discard. as far as a/c, the line ends can be changed by a competent line maker, or you can replace the condensor with a twin cam unit and hard line along firewall, changing only the fitting end going into the a/c evaperator via the fitting on the firewall
if using an S14 twin cam, you will need:
S13 twin cam exhaust manifold
S13 twin cam throttle body (TPS is different on 96+; 95 will work in S13)
custom heater hoses
S13 distributor (S14 dist can be used with harness modification)
S13 coolant temp sensor for gauge (single wire)
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Factory Electric Fans
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the single cam has a small auxilliary fan mounted in the core support in front of the condensor. this fan cannot be used for cooling
the twin cam S13 has a single speed electric fan for a/c compensation. it is located between the radiator and the motor. it also is not sufficient enough for engine cooling
the twin cam S14 fan is a two speed fan. this fan CAN be wired on high permanantly and used as a cooling fan, but is not enough to cool the motor AND the a/c system at the same time. you will notice overheating issues under use. to wire on high, mate the black and yellow wires as the fan ground, and the blue and green wires for power. run fan through a relay triggered by either a thermostatic fan switch or to ignition 'on'.