Build Spotlight: Zach's 1983 280ZX Turbo became the six-speed street sleeper nobody planned
Zach Zimmerman's 1983 Datsun 280ZX Turbo was extensively modified by Godzilla Raceworks, including a rebuilt L28ET, CD009 six-speed conversion and revised suspension. Photo: Godzilla Raceworks
Every ambitious restoration has a moment when the original plan goes out the window.
Sometimes it's a seized fastener.
Sometimes it's unexpected rust.
And sometimes you remove an oil pan to install a turbocharger drain fitting and discover that the engine has been quietly grinding itself to pieces.
That last scenario is exactly what happened during the development of Zach Zimmerman's 1983 Datsun 280ZX Turbo.
The project was documented by Godzilla Raceworks, the Fort Worth, Texas, Datsun specialist, in June 2025.
What began as a substantial collection of performance upgrades eventually became a much more comprehensive mechanical rebuild.
And the finished car offers an interesting lesson in the difference between installing impressive parts and making an entire vehicle work properly.
Starting with a clean 280ZX
Zimmerman purchased the 1983 Turbo through Bring a Trailer in early 2021.
According to Godzilla Raceworks, the final bid was approximately $17,000.
That wasn't an insignificant amount of money for an S130 at the time, but the car offered an attractive starting point.
It was relatively clean, already had some performance modifications and retained the distinctive angular character of the second-generation Z.
Zimmerman initially planned several straightforward upgrades.
A CD009 six-speed manual conversion would replace the original transmission arrangement.
BC Racing coilovers would improve suspension adjustability.
But discussions with Godzilla Raceworks eventually expanded the scope.
The project would also receive substantial front and rear suspension changes, an upgraded differential, modernized CV axles, larger brakes and a more capable turbocharging system.
It was no longer going to be a simple bolt-on project.
Making the drivetrain work together
Godzilla Raceworks installed one of its CD009 six-speed conversion systems, developed in conjunction with Datsunworks.
The arrangement uses the later Nissan transmission architecture with application-specific conversion components.
The build also incorporated an OS Giken clutch-type limited-slip differential in the R200 rear end.
That provided a more sophisticated mechanical arrangement for distributing torque between the rear wheels.
But the CV axle conversion created an interesting problem.
At the time, FutoFab was still developing a dedicated axle package for the 280ZX.
The workshop initially attempted to assemble a solution using parts intended for other Datsun platforms, including the S30 and 510.
That required custom machining to achieve the necessary dimensions and clearances.
Unfortunately, the changes affected the rear brake installation.
Godzilla Raceworks reported that the replacement rotors sat approximately a quarter-inch farther outward than required for the TechnoToyTuning caliper arrangement.
The calipers could no longer be correctly centered over the rotors.
That isn't the sort of mismatch worth ignoring.
Brake-caliper position, rotor alignment and wheel-bearing geometry need to work together, regardless of whether the components were originally intended for the same car.
The team reconsidered the arrangement while FutoFab continued developing its dedicated S130 axle hardware.
It's a useful example of why a collection of individually well-made components doesn't automatically produce a properly engineered system.
An unpleasant surprise inside the engine
While the drivetrain work continued, Godzilla Raceworks began preparing the L28ET for its larger turbocharger.
The shop's normal process involved removing the oil pan and installing a revised turbocharger oil-drain arrangement.
That exposed something considerably more important.
According to the workshop's account, the pan contained metallic debris associated with timing-chain components and casting material.
Further inspection revealed damage affecting the engine's main and connecting-rod bearings.
The original engine was no longer a suitable foundation for the planned performance upgrades.
Rather than continuing with the questionable bottom end, the shop elected to rebuild another L28ET core.
The replacement retained the familiar F54 block and P90A cylinder-head architecture.
It used 0.040-inch oversized dished pistons, upgraded fasteners and additional attention to the engine's timing and water-pump hardware.
The shop deliberately avoided forged pistons, explaining that Zimmerman's intended performance targets did not justify the additional expense.
That's an important engineering decision.
Forged components can provide useful benefits in demanding applications, but they aren't automatically required for every modified turbocharged engine.
A component needs to suit the intended operating conditions, not merely look impressive on a parts list.
The cylinder head creates another problem
The rebuilt engine introduced a second complication.
Godzilla Raceworks initially attempted to reuse the original hydraulic lash adjusters in the P90A cylinder head.
Unfortunately, the adjusters failed to function correctly after reassembly.
The team changed direction again.
Zimmerman selected a Schneider Racing 270-60F-14 turbo camshaft, and the workshop converted the cylinder head to use manually adjustable valve lash.
The change required additional mechanical work, but it also provided an opportunity to alter the engine's operating characteristics.
That modification should not be interpreted as a universally necessary upgrade for every P90A-equipped engine.
It was a response to the particular problems encountered during this rebuild.
The engine-management system also needed attention.
The previous MicroSquirt installation had wiring problems, including connections the workshop described as twisted together and covered with electrical tape.
Godzilla Raceworks replaced the arrangement with its plug-and-play MegaSquirt 2 ECU and harness package.
Once again, the important improvement wasn't simply the brand of electronic hardware.
It was establishing a reliable electrical foundation for the rest of the engine.
The rebuilt L28ET uses a Garrett GT3071 turbocharger, revised fuel delivery and upgraded engine management. Photo: Godzilla Raceworks
A larger turbo without abandoning the L-series
With the engine rebuilt, the team installed a Garrett GT3071 turbocharger using an externally controlled wastegate.
The shop selected a 0.63 A/R turbine housing, balancing the desire for greater airflow with the need to retain useful response.
Supporting modifications included 550 cc fuel injectors, a higher-capacity fuel pump, revised fuel delivery, intercooling and additional cooling equipment.
Godzilla Raceworks described the finished combination as responsive and enjoyable to drive.
However, its published build report does not establish a verified final horsepower or torque figure.
The turbocharger's advertised capability should therefore not be confused with independently measured output from this particular car.
The project is more interesting for the decisions behind the combination than for an unsupported dyno number.
A modernized chassis with old-school character
The finished 280ZX also received Apex Engineered front and rear suspension components, BC Racing coilovers and upgraded Wilwood braking hardware.
The driveline incorporated the revised CV axle arrangement and OS Giken differential.
Inside, the shop installed Speedhut instrumentation that retained the visual character of the original 280ZX cluster.
Recaro seats and additional instrumentation completed the interior.
Externally, the car remained relatively restrained.
Its dark paint, Rota RKR wheels, revised front air dam and de-chromed trim created an aggressive appearance without completely abandoning the S130's original styling.
The result was not a factory restoration.
But neither was it an attempt to disguise the car as something else.
It remained recognizably a 280ZX Turbo.
The interesting part wasn't the parts list
Godzilla Raceworks acknowledged that the project took longer than originally anticipated.
Supply-chain problems, staffing limitations and several unexpected mechanical complications all contributed to the extended timeline.
But the workshop's June 2025 account documents the completed car being returned to its owner.
That makes this project particularly useful as a retrospective.
The finished photographs show an attractive modified Nissan.
The actual build history shows the mechanical problems that had to be solved to get there.
A transmission conversion affected the driveline.
The driveline changes affected the brakes.
A turbocharger installation exposed a damaged engine.
The engine rebuild exposed valve-lash problems.
And the final calibration required correcting questionable electrical work.
None of those problems could be solved simply by ordering another expensive performance component.
They required understanding how the systems interacted.
That's what makes Zimmerman's 280ZX interesting.
Not a spectacular horsepower claim.
Not an exotic engine swap.
Just a classic turbocharged Datsun, thoroughly reworked around the L28ET, with considerably more engineering beneath its skin than the finished photographs initially suggest.
Sometimes the most impressive thing about a build is everything that went wrong before somebody finally got it right.
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