Reinforced valve spring kit Nissan Skyline Z VR30DDTT
Kit of 24 reinforced valve springs for the Nissan VR30DDTT 3.0 V6 twin-turbo engine.
- Brand: SUPERTECH
- Engines: VR30DDTT (Skyline V37, Z Z34)
- Springs: single conical
- Contents: springs, titanium upper retainers, lower spring seats
The Nissan engine covered
These springs are made for the Nissan 3.0 litre twin-turbo V6 with direct injection and 24 valves, engine code VR30DDTT, which has two overhead camshafts per bank. It powers the Skyline V37 from 2019 to 2023 and the Nissan Z (Z34) since 2022, with 305 to 420 hp.
As standard, each valve gets a single spring, part 13203-5CA1A, marked pink on the inlet side and yellow on the exhaust side. The assembly also includes upper retainers 13209-1KC0A, lower spring seats 13205-53Y00 and collets 13210-53Y00.
SUPERTECH reinforced valve spring kit
Once the cam lobe has passed its peak, the spring presses the valve back onto its seat. When revs climb, inertia takes over: the valve lifts off, bounces and may hit the piston, which is valve float.
This kit brings 24 single conical springs, one per valve, inlet and exhaust alike: 356 N on the seat, then 965 N at 10 mm lift.
Valve spring kit technical specification
| Part number | Brand | Springs | Outer / inner Ø | Seat pressure | Open pressure | Rate | Max lift | Kit contents |
|---|---|---|---|---|---|---|---|---|
| SPRK-FM46-VR30-BE2 | SUPERTECH | Single conical | Base 27.3 / 19.1 mm, top 24.5 / 16.3 mm | 356 N at 37.0 mm | 965 N at 10 mm | 60.9 N/mm | 12.7 mm | 24 springs, 24 titanium upper retainers, 24 lower spring seats; original collets kept |
Valve spring kit fitting details
| Part | Nissan original | Reinforced spring kit |
|---|---|---|
| Spring | 13203-5CA1A | Kit specific |
| Retainer | 13209-1KC0A | Kit specific (titanium) |
| Spring seat | 13205-53Y00 | Kit specific |
| Collets | 13210-53Y00 | Original kept |
The SUPERTECH SPRK-FM46-VR30-BE2 kit holds 24 single conical springs, 24 titanium upper retainers and 24 lower spring seats. The original collets are kept.
To get the installed height, measure the gap, valve closed, that separates the lower spring seat from the upper retainer. The 356 N load is quoted at a height of 37.0 mm. When the gap grows, for instance after the valve seats are recut deeper, each extra millimetre removes from the load the spring rate listed in the table above.
| SUPERTECH | |
|---|---|
| Installed height | 37.0 mm |
| Seat pressure at this height | 356 N |
Technical guide
Our brands
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SUPERTECH, a California firm, has supplied valve train parts to competition engine builders for over three decades. The spring wire is a chromium, silicon and vanadium alloy steel, the upper retainers are cut from titanium, and every lot is inspected using ultrasound, radiography and a laser. |
How to choose
Stiffer springs allow higher revs, a livelier camshaft or more turbo pressure without the valves starting to float. This kit gives 356 N on the seat and 965 N at 10 mm lift. Before ordering, measure the real lift of your camshafts and compare it with the datasheet: it has to stay under 12.7 mm, the limit of these springs. The check takes a few minutes and prevents a wrong purchase.
| Criterion | Key point |
|---|---|
| Choosing the pressure | Three criteria drive the choice: camshaft lift, the revs you are targeting and the boost pressure. If one of them rises, the load has to follow, without going past the maximum lift of the springs. This kit supplies 356 N on the seat. Going stiffer than needed gains nothing: cams and tappets would simply wear faster than they should. |
| Single or double spring | Every valve receives one spring whose coil tightens towards the top, hence the conical shape. No inner spring is added, unlike double spring kits. The kit supplies titanium upper retainers together with lower spring seats, while the existing collets carry on in service. |
When reinforced springs become necessary
- Camshafts opening valves further than standard
- Maximum revs far above the factory limit
- Turbo pressure raised after a remap
- Heads rebuilt for circuit, drift or rally
- Fatigued springs, valve float at high revs
Compatible vehicles
| Model | Engine code | Power | Years |
|---|---|---|---|
| Nissan Skyline (V37) 3.0 (RV37) | VR30DDTT | 305 hp | 2019-2023 |
| Nissan Z (Z34) 3.0 / 3.0L Twin-Turbo | VR30DDTT | 383-405 hp | from 2022 |
| Nissan Z (Z34) 3.0 NISMO | VR30DDTT | 420 hp | from 2023 |
OEM part number (valve spring): 13203-5CA1A (spring), 13209-1KC0A (upper retainer)
Related products
Cylinder heads off? Have the valves and guides inspected before refitting the springs. The valves made for this engine are offered below:
| Nissan Skyline Z VR30DDTT inlet valves → |
| Nissan Skyline Z VR30DDTT exhaust valves → |
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Brand
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ReferenceSPRK-FM46-VR30-BE2
