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How Turbochargers Work

Ever wondered how a turbocharger makes your engine produce more power?

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Can Retrofitting Newer Injectors Really Provide a Quick, Inexpensive Power Bump?

Looking for an easy, low-buck power gain? Newer fuel injectors may be a quick fix.

Easy ND Mazda MX-5 Performance Tips from Good-Win Racing

What are the three most important modifications to make on an ND MX-5? Good-Win Racing’s Brian Goodwin gave us two separate lists, one for street and autocross, and another for …

When is it time to upgrade your clutch?

How well your car performs–and how nicely it drives–can often depend upon your clutch.

Honda
What's the Diff? | Figuring Out Which Differential Setup Is Fastest on Track

Three differential approaches, three different answers.

How to pick the right gear ratio for your needs

There are lots of ways to adjust gearing.

Turbo Boost Is Good, but Too Much Can Be Bad

Don't get us wrong: More boost is almost always more better. But there is such thing as too much boost.

What makes the best air intake?

We built (and actually tested) different intake designs.

How to Accurately Measure Your Compression Ratio

After building an engine, the bombardment of questions soon follows. Unfortunately, you might not know the answer to one important question: What is your engine’s compression ratio?

How Crack Checking and REM Polishing Can Better Prepare a Transmission for Track Use

Transmission internals are subject to intense stresses. Crack checking and polishing can help ensure that those stresses don’t lead to failures down the road.

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