Welcome to
SINGH GARAGE; here you will most knowledge and resources speciliasing in CA18's. Two cars are featured below:
Bought this car over a year ago, sorta went halves with bro, his daily, my weekender.

This is the setup that made ~270rwhp @ 16psi (stock headgasket/internals - compression was about 160 even across all cylinders),
note: it wasn't fully tuned, nor were cam gears dialled in, and it had few issues, like butterflies were disconnected and causing loss in power due to running slightly lean off boost, other than that it AFR's were safe.
1989 180sx EngineCA18DET
GTiR T28 Turbo
Denso 510cc Injectors
HKS 256/256 Cams and Camgears
Gates Racing High Performance Timing Belt
Z32 AFM with Apexi Power Intake on custom metal intake pipe
600x300x100mm FMIC with custom stainless steel piping
3" Turboback exhaust with twin cannon
Turbotech boost controller
Oil Cooler kit
R32 Radiator
ExteriorNismo Front bar
Nismo Sideskirts
Type X Taillights
Suspension/Brakes/DrivelineFront and rear slut braces
Buddyclub P1's
17x8"+32 Front
17x9"+37 Rear
R32 Skyline Front Brakes & rotors redrilled to 4 stud.
D-Drug Coilovers (11/8 springrates)
GTR rear swaybar (in the shed)
Xtreme 6 puck clutch with heavy duty pressure plate
Tomei 2way 4.3 LSD
InteriorOMP deep dish steering wheel
240km/h Instrument Cluster
Recaro SR3 bucket seat
Nismo gearknob
Bee*R Rev Limiter
Sony Xplod Deck
Panasonic 6" front speakers
Panasonic 6x9 rear speakers
Autogauge oil pressure, boost, water temp on A pillar
http://i11.tinypic.com/47ltobm.jpg http://i14.tinypic.com/4i5ipza.jpg http://i12.tinypic.com/35b5n2a.jpg http://i10.tinypic.com/2pqnpqh.jpg http://i14.tinypic.com/491kaac.jpg http://i17.tinypic.com/33vnko8.jpgUnforutnately, the oil pump randomly died (could've been caused by old T28bb that blew and sent ball bearings to the sump) and also the compression had dropped on one cylinder,

so;
New parts going on:Greddy Forged Pistons 84mm
Tomei 1.5mm headgasket
ARP Headstuds
ARP L20 rod bolts
Rods shot peened/balanced
Machined/balanced/blueprinted/etc bottom end
ACL race bearings
Nissan oil pump/gaskets/heater hoses etc.
Garrett GT2871R 52 trim 0.64 A/R
Turbosmart 45/8 external gate
Nismo 600cc injectors
Also been contemplating a respray in
Yashio Pink 
Thats all I can think of...Hoping for ~300rwhp with safe tune.

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My daily, which I bought stock as a rock in early 2005;
1989 Silviastock CA18DE manual, which I had planned to convert to SR, but found more fun in chopping SR's with CA18's
InteriorNardi Steering Wheel
'Silvia' El Dials on HUD
Bride Brix driver and passenger seats on Bride Low Rails
Alpine deck, 6.5" Splits and 6x9's speakers.
Suspension/Brakes/DrivelineWork CR-Kai White Wheels 17x8" +32
HSD HR Series Coilovers
R33 gts-t front and rear brakes with braided lines
ExteriorMFX Vertex "Big Mouth" Bodykit
Carbon Fibre Hood
Carbon Fibre Bootlid
Carbon Fibre B Pillars
Carbon Fibre Ganador Mirrors
Plan is now to CA18DE+T using most of the parts that are coming out of the 180 after its finished.
Engine:CA18DE+T
GTiR T28 (recondition with 360 thrust bearing)
CA16DE inlet cam (still looking for one...)
Denso 510cc Injectors
CA18DET sump
CA18DET braided oil and water lines
Tomei 1.5mm Metal Headgasket
Gates Racing High Performance Timing Belt
FMIC
3" Exhaust (Got a CES dump pipe to suit S13 SR, still got to check if it'll fit the CA)
More info can be found of the Silvia's progress at (Needs updating

)
http://51NGH.blogspot.com Although it is predicted that the ETA 2008.. All parts have been acquired, just a matter of finishing uni first - 3 months to graduation!!

Here's some pics of the Silvia back from the painter (Don't mind the lift kit - I've got new coilovers since)
http://i16.tinypic.com/307x2k8.jpg http://i19.tinypic.com/2h3dkid.jpg http://i17.tinypic.com/4dh9tuv.jpg http://i17.tinypic.com/2q1ffc7.jpghttp://i19.tinypic.com/5ymd4js.jpg________________________________________________________________________________
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Most of the work done myself, with help from mates, when the going gets tough, hats off to Roy @ Kensei Garage.
Cheers
Shaun