Fresh Legs for the Z32

The reason for the 300ZX visiting my garage was leaking rear struts. Not surprising - they're the factory originals with 32 years on them. Only 38,900 miles, but time doesn't care about mileage. I decided it was time for a full suspension refresh with KYB struts all around.

I started with the rears in early November. Getting the strut assemblies out of a Z32 is a bit of a wrestling match - the suspension arms don't exactly drop down on their own. My solution was a ratchet strap to pull the arms down far enough to clear the strut for removal and reinstall. Worked like a charm.

One thing I noticed during disassembly was that the factory rubber strut mounting gaskets were completely shot. The OEM replacements are absurdly expensive, so I designed a set of gaskets and printed them in TPU. The flexibility of TPU makes it a great substitute for rubber - it'll handle the vibration dampening while lasting a lot longer than the originals did.

I came back to the fronts in late December. Same process - old struts out, new KYB assemblies built up with the printed gaskets, and installed.

The difference is immediately noticeable. The car feels planted and composed in a way it just wasn't before. Thirty-two years of slow deterioration means you don't really notice how bad things have gotten until you put fresh components in. The Z32 is riding like it should again.

A Family Visit

Every now and then a family member comes to stay for a while. In this case, it's my dad's 1993 300ZX Convertible - one of the rarer Z32 variants Nissan built. With just under 39,000 original miles on it, this car has been well preserved, but time catches up with everything. Factory original fluids, factory original struts, factory original tires - you get the idea. Thirty-two years of "original" adds up.

The plan is an extended stay here in the garage to knock out the maintenance backlog. Struts, coolant flush, clutch hydraulics, transmission and differential fluids, new tires - basically everything that ages out regardless of mileage. The car doesn't get driven much, but that's almost worse for some of this stuff. Rubber deteriorates, fluids break down, and struts lose their damping whether you put miles on them or not.

I got her up on the lift and took a good look around. For a 32-year-old convertible, the condition is impressive. No rust, solid undercarriage, and the VG30DE looks like it's barely been touched. It's going to be a fun project working through the list.

Stay tuned for more!

Pan Handling

At just under 2,700 miles, the Z was due for its second oil change. I captured an oil sample at drain for SPEEDiagnostix analysis - my second sample on this engine - and figured this was the perfect time to swap the stock oil pan for the Z1 Motorsports aluminum pan I'd been eyeing.

The stock pan is plastic. I'd already installed a Z1 aluminum undershroud to protect it, but the Z1 aluminum pan appealed to me for a few reasons. Over time and heat cycles, that plastic pan will become brittle. The Z1 pan also increases the oil capacity - never a bad thing. But more importantly, the design of the stock pan leaves about 8/10 of a quart of dirty oil trapped in the bottom. The metal insert for the drain plug has to be reinforced in the factory plastic pan, and that reinforcement creates a pocket that never fully drains. You can see it in the photos of the factory pan.

With the stock pan off, I got a good look at the VR30's internals - oil pickup, timing chain, and the inside of the block. Everything looked clean and healthy for a motor still in break-in. No unusual deposits or wear marks. Good signs.

I cleaned the mating surfaces, applied the new gasket, and torqued the Z1 pan into place. The fit was spot-on. With the added capacity of the Z1 pan, it took over 6 quarts to fill - a nice bump over stock. Swapped in the fresh filter and buttoned everything up.

The difference underneath is night and day - that finned aluminum pan sitting next to the red front subframe looks like it belongs on a purpose-built machine. Form and function in one shot.

Seeing Clearly Now

The Cube's headlights had gotten pretty hazy over the years. Fourteen years of UV exposure will do that to polycarbonate lenses - they develop that familiar cloudy, yellowed look that makes the car look tired and cuts down on light output at night.  I grabbed a 3M Headlight Lens Restoration System (39008) off Amazon to tackle the job. It's a drill-mounted kit that steps through progressively finer sanding discs followed by a polishing compound - takes the guesswork out of the process. I taped off the paint around the lenses and worked through the grits. The 3M kit makes quick work of it - you can see the oxidation coming off with the first disc.

The difference was night and day. What were dull, yellowed lenses are now clear again. It's one of those jobs where the effort-to-reward ratio is hard to beat - maybe 30 minutes per side and the front end looks ten years younger.

Not bad for a Sunday afternoon!

Letting the Z Breathe

The Z had about 2,000 miles on it and I figured it was time to let the VR30 breathe a little easier. I grabbed the NISMO Cold Air Intake - one of the few bolt-on intake upgrades that's actually engineered for this platform rather than just slapped together with a cone filter and a prayer.

The stock airbox does its job, but it's conservative by design. The NISMO unit replaces it with a purpose-built intake box and ducting that improves airflow without sacrificing filtration. The install itself spanned two evenings - I started the night of October 4th and wrapped it up the next day.

First order of business was disconnecting the factory airbox from the intake hose. If you're doing this yourself, do your homework on that retaining clip before you start yanking on things. A couple of long screwdrivers will do the job - just pop the clip forward as far as you can and the airbox lifts right off.

The most challenging part was getting to the hose clamps connecting the factory air hose to the turbo inlets. I used a combination of swivel socket extensions to work in the tight space. The passenger side was noticeably more difficult than the driver's side - it's tighter over there, and there's an extra PCV hose connected to the intake hose that you have to deal with.

Of course, the garage supervisor had to be on-site for the entire operation. She set up camp with her fan and tennis ball and kept a close eye on things from her bed. Quality control at its finest.

With the NISMO intake in place alongside the Z1 carbon engine cover and radiator air guide, the engine bay is starting to look the part. The twin NISMO intake boxes give it a purposeful look that matches the rest of the build. More importantly, the throttle response feels just a touch sharper. Time will tell if the seat-of-the-pants feel holds up!

Carbon Dressed

I'm not normally one to install purely aesthetic parts, but I couldn't resist installing these two bits right before taking the Z to the Z Nationals show. Z1 was running their fall sale so I grabbed a carbon fiber engine cover and a carbon fiber radiator air guide - both Z1 pieces designed for the 2023+ Z.

The install on both is about as straightforward as it gets. The engine cover swaps directly with the OEM plastic piece, and the radiator air guide replaces the stock unit up front. No trimming, no modifications - just bolt-on. I had both pieces on the car within an hour of opening the boxes.

One thing I noticed after pulling the factory engine cover - the tops of the air-to-water intercoolers were now fully exposed. The OEM cover had been hiding them, and they weren't exactly show-ready. So I took the time to polish them up before dropping the carbon cover in place.

The difference in the engine bay is immediately noticeable. The carbon weave gives the VR30 a much more finished look, and the polished intercooler tops peeking through don't hurt either. The air guide up front cleans up that area nicely - it's one of those pieces you don't think about until you see the upgrade.

At 1,700 miles the Z is still relatively fresh, but at least the engine bay will look presentable at the show!

Cornered!

The rear bumper end caps on the 280z were done. These are the rubber corner pieces that wrap around each end of the rear bumper, and after nearly 50 years they were cracked and deteriorated. Replacements? Nobody makes them. Not surprising for a part that Nissan stopped producing decades ago.

I decided to 3D scan the original part and build a digital model from the scan data. The first shot shows the original on the kitchen table covered in scan targets. Once I had the scan, I spent a good amount of time in the modeling software cleaning up imperfections and customizing the model to fit both the right and left sides of my car specifically. It took a few prototype prints to get the fit dialed in.

Once I was happy with the geometry I test fitted one on the car to verify everything lined up with the bumper and body.  For the finish, I went with Plasti Dip black topped with Plasti Dip clear for UV protection. This matches the treatment I'd already applied to the rest of the bumper rubber, so everything looks consistent.

The end result looks like it belongs there. Another unobtainable part brought back to life with a scanner, a printer, and some patience.

Keeping Cool with the Pulsar

The A/C condenser fan on the Pulsar NX had seen better days. The motor was shot - corroded and tired after 37 years of duty. Unfortunately, like so many parts for this car, a direct replacement doesn't exist anymore.

I grabbed a generic 12V 80W fan motor from Amazon. It was the right spec but predictably didn't match the original mounting pattern on the fan support bracket. No surprise there - when has anything bolted right up to this car?

I designed an adapter bracket to mate the new motor to the existing mounting hardware and printed it in MatterHackers CarbonX - a carbon-fiber-infused nylon. It's rigid, heat-resistant, and more than up to the task of living near a condenser. One of the advantages of having a printer dialed in for engineering materials is that problems like this become an afternoon instead of a dead end.

The old assembly next to the new one tells the whole story. Thirty-seven years of heat on the original versus a fresh motor with a bracket that'll probably outlast the car.

Another discontinued part problem solved with a spool of filament and a couple hours of CAD work. The Pulsar's A/C system is back in business.

Finding Its Voice

The Z came from the factory with a capable twin-turbo V6 but a pretty tame exhaust note. With the sway bars freshly installed, I decided it was time to let the VR30 breathe a little. I went with a two-piece setup from Z1 Motorsports - the Premium Stainless Steel Y-Pipe and the Touring-Ti Titanium cat-back.

First order of business was getting the factory exhaust off the car. I worked backwards from the rear - mufflers first, then the mid-pipe, and finally the factory Y-pipe. One thing that surprised me was how small the OEM Y-pipe diameter was. You'd think a 400hp twin-turbo motor would have a little more room to breathe down there.

The Z1 Y-pipe went in next. The difference in diameter was obvious - the stainless piece replaces the restrictive OEM mid-pipe with larger tubing and braided flex joints. The weld quality on the Z1 piece is impressive - clean welds and solid flange connections.

One thing worth mentioning - the Y-pipe fit tight against the chassis. I had to bend the pipe down slightly to keep it from making contact with the body, which wasn't the easiest thing to do on stainless. Not a dealbreaker, but it took some persuasion.

From there the titanium cat-back bolted right up. The fitment was excellent - everything tucked up tight with good clearance around the differential and sway bar. The titanium mufflers are noticeably lighter than the stock pieces.

The Z1 titanium tips fill out the rear diffuser nicely. Subtle but purposeful.

First startup was exactly what I was hoping for - a deeper, more aggressive tone at idle that opens up under throttle without being obnoxious. The Touring-Ti lives up to its name. Civilized when cruising, but it lets you know the turbos are there when you get on it.