Reinforced valve spring kit Nissan 300ZX VG30DE VG30DETT

€1,238.15 (tax incl.)

Reinforced valve spring kits for the Nissan VG30DE and VG30DETT 3.0 V6 24V engines.

Brand: SUPERTECH
Engines: VG30DE and VG30DETT (300ZX Z32)
Springs: double
Contents: springs, upper retainers, lower spring seats

Nissan engine covered

This kit fits the 3.0 litre 24-valve V6 of the Nissan 300ZX Z32, sold as the naturally aspirated VG30DE and the twin-turbo VG30DETT and built from 1989 to 1997.

The double springs in the kit replace the standard ones, together with their upper and lower retainers; the original collets stay fitted.

SUPERTECH reinforced valve spring kit

Beyond the cam lobe's peak, the spring has to shut the valve and push it back onto its seat. Rising revs bring inertia into play: when load is lacking, the valve bounces, comes back late and may strike the piston. This is called valve float.

Seat load at 35 mm: 329 N (SPRK-TS1012-2) or 374 N (SPRK-TS1015-2), both with double springs.

Valve spring kit technical specification

Part number	Brand	Springs	Outer / inner Ø	Seat pressure	Open pressure	Rate	Max lift	Kit contents
SPRK-TS1012-2	SUPERTECH	Double	Outer 27.5 / 20.0 mm Inner 20.0 / 15.2 mm	329 N at 35 mm	854 N at 10 mm		12.0 mm	24 springs, 24 upper retainers, 24 lower spring seats
SPRK-TS1015-2	SUPERTECH	Double	Outer 27.5 / 20.0 mm Inner 20.0 / 15.2 mm	374 N at 35 mm	899 N at 10 mm		12.0 mm	24 springs, 24 upper retainers, 24 lower spring seats

Valve spring kit fitting details

Part	Nissan original	Reinforced spring kit
Spring		Kit specific: SPR-TS1012 or SPR-TS1015 (double)
Retainer		Kit specific: RET-NVG1015/T1
Spring seat		Kit specific: SEAT-TS1015
Collets		Original kept

Each SUPERTECH kit contains 24 double springs, 24 RET-NVG1015/T1 upper retainers and 24 SEAT-TS1015 lower spring seats; the original collets stay fitted.

Measured with the valve shut, installed height runs from the lower spring seat that supports the spring up to the upper retainer. Quoted loads hold only at that figure. If it grows, for instance after the valve seats are machined again, the spring relaxes and gives up load at each extra millimetre, according to its rate; see the table.

	SUPERTECH
Installed height	35 mm
Seat pressure at this height	329 / 374 N

Technical guide

Our brands

SUPERTECH is a California company making valvetrain components for competition, with over thirty years in the trade. Its springs are drawn from chrome-silicon-vanadium wire, and each production batch is then checked three ways: ultrasound, X-ray and laser.

How to choose

Heavier springs keep the valve pressed to the cam far higher in the rev range. Raising the limiter, fitting a livelier camshaft or turning up the boost becomes realistic with no risk of valve float. Both kits hold 329 N or 374 N on the seat at 35 mm, as the table above shows. What is left is to confirm the cam never opens the valve beyond what the springs can handle: 12.0 mm of net lift at most, whichever kit is fitted.

Criterion	Key point
Choosing the pressure	The 74 and 84 lbs figures describe seat load, meaning 329 N and 374 N. To choose, line up cam lift, your target revs and your boost level: each increase calls for extra load, within the kit's lift limit. Do not overdo it, though, as springs stiffer than necessary wear the cam lobes sooner. Think about real use too, not only the peak.
Single or double spring	Two concentric springs sit on every valve, sharing the work and damping each other. A single-coil spring would remain closer to the original fitment. Upper retainers and lower spring seats are supplied with each kit.

When reinforced springs become necessary

Camshaft more aggressive than standard
Maximum revs you want to raise
Boost raised past the factory setting
Head rebuilt for track or rally use
Worn standard springs, or valves floating at high revs

Compatible vehicles

Model	Engine code	Power	Years
Nissan 300ZX (Z32) 3.0	VG30DE		1989-1997
Nissan 300ZX (Z32) 3.0 Twin Turbo	VG30DETT		1989-1997

Important: these kits are for the Nissan VG30DE and VG30DETT 3.0 V6 24V engines of the 300ZX Z32. The 12-valve VG30 of the 300ZX Z31 is not covered. Check your engine code before ordering.