IAG Performance Competition Series EJ Timing Belt Tensioner

The latest OEM Subaru timing belt tensioners perform adequately for mild performance builds, but under high-revving conditions or in vehicles equipped with sequential transmissions, the factory tensioner can lose its ability to maintain proper belt control. This can cause the engine to skip timing, which in some cases may be resolved by simply resetting the belt. However, skipped timing can also result in severe engine damage.

In testing with our Subaru GD STI road-race car equipped with a sequential transmission, the factory tensioner repeatedly allowed timing skips. This led to the development of a tensioner capable of holding the belt securely and maintaining precise timing. Extensive testing on the STI race car, as well as additional road-race and drag applications, confirmed that the IAG tensioner fully resolved the issue, eliminating all timing belt skips.

The IAG "WRC Style" V2 Tensioner combines proven components from previous Subaru models with an additional roller to improve timing control and belt tension. The base is CNC-machined from billet aluminum and anodized black for durability and corrosion resistance.

IAG leverages years of experience as both a manufacturer and a service facility specializing in timing rollers and idlers. Not all rollers perform equally, and some fail prematurely. The "WRC Style" V2 Tensioner uses NTN OEM-style rollers to ensure long-lasting reliability. IAG does not recommend substituting other rollers, as only the Subaru OEM-style roller guarantees proper function, despite its higher cost.

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