SFR D-Series HD Timing Belt Tensioner Spring
SFR
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SpeedFactory Part# SF-05-012
The SpeedFactory Racing D-Series HD Timing Belt Tensioner Spring is made from durable & corrosion resistant 302 stainless steel and is over 6x stronger (the OEM spring is very weak & we found the need for a much higher spring rate).

Tired of trying to consistently set your timing belt tension to a suitable level for your high-performance D-Series engine? Those days are over thanks to our solution to this common problem.

This high-quality spring gives your timing belt the proper tension level for high-performance and racing applications, especially when using a heavy-duty racing timing belt (such as Gates Racing) which are much stiffer & stronger than an OEM type belt.

Not enough tension (OEM spring) and you get excessive belt deflection with poor cam timing control and a high risk of jumping teeth resulting in expensive valve damage or worse.

Pulling on the tensioner with a hook to try and get enough tension has been a work-around but yields non-repeatable results at best and easily results in over-tightening which can cause undue stress on the belt and cam journal wear issues.

This is what we use for our own top level engine builds with no other form of additional tensioners.

*Special Order, Generally Ships in 2-4 Weeks*

A cold air intake system relocates the filter outside of the engine compartment to deliver cool air inlet temperatures. Cooler air carries more oxygen, which translates into a more intense explosion in the combustion chamber to create more horsepower and torque. But that's only part of the power equation. Tuning the inlet pipe in length and diameter to match the engine's resonance helps move more air to the cylinders (think of your engine as a big air pump), and this tuning allows us to deliver large power gains. We also monitor fuel trim correction factors and all OBDII sensors during product development to eliminate leaning the engine out and/or throwing a check engine light.

Every AEM cold air induction system features high standards of construction and we are so confident in their fit and performance that we guarantee them for the life of your vehicle. All AEM cold air systems include a lifetime Dryflow™ synthetic air filter and come with a limited lifetime warranty.