Reinforced valve spring kit Toyota 2RZ-FE 3RZ-FE

€916.70 (tax incl.)

Reinforced valve spring kits for Toyota with 2RZ-FE and 3RZ-FE engines.

Brand: SUPERTECH
Engines: 2RZ-FE 2.4 and 3RZ-FE 2.7 (Hilux, Tacoma, 4Runner, Land Cruiser)
Springs: double
Contents: springs, upper retainers and lower spring seats

Toyota 2RZ-FE and 3RZ-FE engines covered

The 2.4 litre 2RZ-FE and the 2.7 litre 3RZ-FE are Toyota four-cylinder engines with 16 valves and twin overhead camshafts. They power the Hilux, Tacoma, 4Runner, T100, Land Cruiser 90 and Prado.

The kit replaces the original spring together with its upper retainer and its lower spring seat.

SUPERTECH reinforced valve spring kit

Once the cam backs off, the spring alone returns the valve onto its seat. Once revs are high the valve is slow to follow: with too little load it bounces, shuts late or hits the piston, which is valve float.

Seat pressure: 343 N at 35.6 mm for the SPRK-EC3025D-2RZ and 480 N at 35.6 mm for the SPRK-EC3027D-2RZ, 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-EC3025D-2RZ	SUPERTECH	Double		343 N at 35.6 mm				Springs, titanium upper retainers, lower spring seats
SPRK-EC3027D-2RZ	SUPERTECH	Double	Outer 26.6 / 19.6 mm Inner 19.6 / 14.2 mm	480 N at 35.6 mm				Springs, titanium upper retainers, lower spring seats

Valve spring kit fitting details

Part	Toyota original	Reinforced spring kit
Spring	90501-31017 ; 90501-36002	Kit specific: SPR-EC3025D or SPR-EC3027D
Retainer	13741-46020	Kit specific: RET-EC3020/T6P
Spring seat	90201-18015	Kit specific: SEAT-3020-2RZ
Collets	90913-03021	KPR-6T-ST-32 (1 groove)

The SPRK-EC3025D-2RZ and SPRK-EC3027D-2RZ both pair double springs, SPR-EC3025D or SPR-EC3027D, with RET-EC3020/T6P titanium upper retainers and SEAT-3020-2RZ lower spring seats.

By installed height we mean the space between the two retainers while the valve rests on its seat. The loads in the table apply at that exact figure only: a larger gap, caused by skimming the cylinder head for instance, lowers the load in step with the spring rate. The two kits sit side by side in the table below, height and load together.

	SUPERTECH
Installed height	35.6 / 35.6 mm
Seat pressure at this height	343 / 480 N

Technical guide

Our brands

SUPERTECH is a company from California that specialises in racing valvetrain parts and has served that market for over thirty years. Every series of springs is examined by radiography, ultrasound and laser before shipment, in order to reject internal flaws in the material.

How to choose

More seat load keeps the valve pressed on the cam where the original spring gives up: a pushed-back limiter, a more aggressive camshaft, a turbo added without float. The two kits announce 343 N for the SPRK-EC3025D-2RZ and 480 N for the SPRK-EC3027D-2RZ, measured at the heights in the earlier table. Stay reasonable: a spring harder than needed ages cams and tappets sooner.

Criterion	Key point
Choosing the pressure	The number of pounds, 77 or 108, is the seat load of the kit and the table converts it to newtons. To decide, look at the camshaft lift, the revs you intend to reach and the planned boost: the higher any of the three, the more load you need. Past that need, extra load serves no purpose and wears cams and tappets for nothing.
Kit contents	Both kits deliver the same parts around the spring: RET-EC3020/T6P titanium upper retainers and SEAT-3020-2RZ lower spring seats. Only the double spring differs, SPR-EC3025D in the first kit and SPR-EC3027D in the second, which explains the gap in load between them.

When reinforced springs become necessary

Camshaft with a higher valve lift
Rev limiter you plan to raise
2RZ-FE or 3RZ-FE converted to turbo or supercharger
Head rebuilt for circuit, rally or off-road work
Tired springs, valve float before the limiter

Compatible vehicles

Model	Engine code	Power	Years
4Runner III (N18) 2.7	2RZ-FE / 3RZ-FE	152 hp	1995-2002
Granvia (H1, H2) 2.7	2RZ-FE / 3RZ-FE	145 hp	1995-1998
Hilux III (N1, N2) 2.7	2RZ-FE / 3RZ-FE	145-152 hp	1995-2005
Hilux VI (N1) 2.4 / 2.7	2RZ-FE / 3RZ-FE	140-150 hp	1997-2005
Land Cruiser 90 (J9) 2.7	2RZ-FE / 3RZ-FE	150 hp	1995-2002
Land Cruiser Prado (J12) 2.7	2RZ-FE / 3RZ-FE	152 hp	2002-2004
T100 2.7	2RZ-FE / 3RZ-FE	152 hp	1993-1998
Tacoma (N1) 2.4 / 2.7	2RZ-FE / 3RZ-FE	144-152 hp	1995-2004