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GRM+ | BMW
#TBT: This E30 BMW racer runs on biodiesel

Although this BMW looks like any other E30 racer, this one runs on biodiesel.

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GRM+
All about oil for street and autocross use

We ask various experts in the engine oil industry questions most commonly fielded by automotive enthusiasts.

David S. Wallens
GRM+
Is your clutch pedal slowing you down?

Want to go 3-4 mph faster down the straights after installing a simple $20 part? BimmerWorld offers that advantage.

David S. Wallens
GRM+
How crack checking and REM polishing can make a gearbox track-ready

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.

J.G. Pasterjak
How to accurately measure 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?

Carl Heideman
GRM+
Should you upgrade your clutch?

How well your car performs–and how nicely it drives–can often depend upon your clutch. Here's how to tell if it's time for an upgrade.

J.G. Pasterjak
GRM+
Straight talk on oil for track and race use

We ask various experts in the engine oil industry questions most commonly fielded by automotive enthusiasts.

David S. Wallens
GRM+
What design make the best air intake? | Swap Science

We built (and actually tested) different intake designs.

Carl Heideman
Toyota
Can blueprinting old fuel injectors really increase performance?

One of the first things we do whenever we pick up an older car? Go through the fuel system.

Tom Suddard
6 steps to make the most of your manual transmission

Manual transmissions might be crude, simple devices, but that doesn't mean improvements can't be made.

Robert Bowen
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