Supertech Upgraded Valve Springs for GR Corolla Engine

Description

Overview

At one point it was rumored that the USDM Corollas had stiffer valves springs compared to the GR Yaris. We have recently proven this to be false. This should be the first engine modification done as it’s the first limiting factor when tuning. Before the stock turbo is maxed out, valve float at high RPM occurs.

Here lies the “Drop in” solution. We highly suggest these to be installed by a professional. 
Uses Factory Retainers, Keepers and Seats.

Key Features & Highlights

• Performance-Oriented Design: Beehive profile lowers the mass at the top of the spring, helping to control harmonics and reduce the likelihood of valve float at elevated RPMs — ideal for performance and racing applications.

• Quality Construction: Made from high-grade Superclean chrome silicon vanadium steel for superior strength, fatigue resistance, and long-term durability under extreme engine conditions.

Optimized Spring Specs:

Supertech Spring Weights

• Intake- 90lb @ 42.6mm Seat Pressure (Closed) – 212lb @10mm (Open)
• Exhaust- 90lb @ 42.6mm Seat Pressure (Closed) – 212lb @ 10mm (Open)
• Max Net Lift- 17mm
• Coil Bind – 25.6mm
• Rate – 12.2 lb/mm

Stock Spring Weights

• Intake- 50lb – Seat Pressure (Closed)
• Exhaust- 80lb Seat Pressure (Closed)

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