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El Mirage

     The Dry Lake Gives You Less Room

Bonneville gives a land-speed car miles to gather itself together.

El Mirage is less generous.

The dry lake in California’s Mojave Desert has been one of the homes of American land-speed racing for generations, but its personality is different from the salt. The course is shorter, the start matters more, the hard-packed lakebed has its own traction problems and a driver has considerably less distance to turn horsepower into a useful number.

The objective is still simple enough to fit on the side of a toolbox: go through the timing lights faster than the record says you need to.

El Mirage simply gives the car less time to quit fooling around.

A Dry Lake Is Not a Salt Flat

El Mirage Dry Lake lies in the Mojave Desert west of Adelanto, California. The lakebed sits at roughly 2,840 feet of elevation and stretches for several miles across a broad, remarkably flat basin.

It looks empty because that is one of its better features.

The surface is hard-packed dry lakebed rather than Bonneville salt. When conditions are right it provides a long, flat place to accelerate a car or motorcycle without asking anybody to build several miles of pavement first.

But dry is doing important work in that description. Rain can close the lakebed, and surface condition changes with weather, traffic and the natural cracking and drying of the clay. A smooth course one meet is not a contractual promise for the next.

The racetrack is geography again.

This time geography brought dirt.

The Southern California Dry Lakes Built Hot Rodding’s Test Bench

Long before drag strips became organized pieces of pavement, Southern California hot rodders were taking stripped-down cars to dry lakes and finding out what their engines, gearing and nerve were worth.

That tradition produced more than fast cars. It helped produce organized land-speed racing itself. Racers from the dry-lakes clubs joined together to create the Southern California Timing Association so somebody could establish classes, safety rules, timing procedures and a reasonable answer to the question of whose speed actually counted.

El Mirage became one of the places where that culture survived and matured.

The connection to hot-rodding history is therefore more direct than a museum display. Roadsters, coupes, lakesters, streamliners and motorcycles still line up on the same kind of desert surface that taught earlier generations why lowering a car, improving airflow and finding another few horsepower were worth arguing about.

The machinery improved.

The stopwatch remained difficult to impress.

The Course Is Short Enough to Change the Engineering

The traditional SCTA El Mirage land-speed course is roughly 1.3 miles long from the start toward the timing area, followed by additional lakebed for shutdown.

That is a very different assignment from a long Bonneville course.

At Bonneville, a powerful car may spend miles building toward maximum speed before the important timed sections arrive. At El Mirage, the car starts from rest or a push start and has roughly a mile and a third to turn acceleration into a final timed speed.

Now the beginning of the run matters enormously.

A lazy launch, excessive wheelspin, a bogged engine or gearing that takes too long to reach the useful part of the power band consumes a substantial percentage of the available course. There may be plenty of horsepower waiting farther up the tachometer. The timing lights are under no obligation to move farther away while the car goes looking for it.

El Mirage therefore sits somewhere between the long patience of Bonneville and the immediate violence of a drag strip.

The racer needs acceleration.

He also needs enough top-end gearing that acceleration has somewhere useful to go.

Traction — Dirt Has Opinions About Horsepower

The lakebed can be firm and smooth, but it is still not a prepared drag strip.

A high-powered land-speed car has to put torque through tires running on hard-packed dirt and clay. Surface dust, loose material, small irregularities and changing conditions can all reduce the amount of power available before wheelspin begins.

That makes the first part of the run an engineering compromise. Apply too little power and precious distance disappears. Apply too much and the driven tires spend that same distance rotating faster than the car is traveling.

Neither condition impresses the timer.

Suspension, tire choice, tire pressure, weight distribution, gearing and power delivery all have to help the car accelerate without turning the starting area into a geology project.

The problem gets more interesting as speed rises. Wheelspin is no longer merely an acceleration problem if it begins moving the back of the car sideways. A few degrees of yaw at serious speed changes what the air sees, and now traction has invited aerodynamics into the disagreement.

El Mirage does not require less horsepower.

It requires horsepower that knows when to behave.

Gearing — One Point Three Miles Is a Deadline

Land-speed gearing always balances acceleration against ultimate speed. El Mirage makes the deadline obvious.

Gear the car too short and the engine may reach its rpm limit before the timing lights. Gear it too tall and the engine can spend most of the course trying to climb into the power band.

The theoretical top-speed calculation is only the beginning. The racer has to ask whether the engine can actually pull that ratio through aerodynamic drag and whether the car can reach the useful rpm before the measured distance runs out.

A combination capable of 250 mph with unlimited room may be slower at El Mirage than one geared for less theoretical speed but considerably better acceleration.

The stopwatch does not award points for speed the gearing promised to deliver two miles after the course ended.

That is why El Mirage can be such a useful test bench. It forces engine power, torque curve, gear ratios, traction and aerodynamics to reach an agreement quickly.

Anybody can propose a committee.

The timing lights want a decision.

The Timing Number Comes Late, but the Run Is Built Early

El Mirage is timed as a land-speed event rather than an elapsed-time race. Reaction time is not the objective, but the short course makes everything before the timing area matter.

A strong run gets away cleanly, builds speed through the gears, stays centered and reaches the timing lights still doing useful work. Two cars with similar peak horsepower can therefore produce very different numbers if one has better traction, gearing or acceleration over the available distance.

The final speed is simply where all those earlier decisions become visible.

Horsepower gets a vote.

El Mirage counts the ballots at the other end.

Records — One Number, One Class, One Piece of Dirt

El Mirage maintains its own SCTA class records. Those records are related to Bonneville records because much of the same land-speed machinery and classification philosophy appears at both places, but the numbers are not interchangeable.

A car that holds a Bonneville record does not automatically own the corresponding El Mirage record. The course, surface and event procedure are different enough that each venue keeps its own book.

For an El Mirage certified record, the vehicle has to run faster than the existing record or meet the applicable class minimum when no established record provides the target, while satisfying the required inspection and certification procedures.

That single timed number can therefore carry considerable weight. There is no need to pretend a 190-mph record is insignificant because another class runs 260. The class tells you what problem the builder was actually solving.

A production-bodied coupe, blown roadster and streamliner may all use the same dirt.

They did not receive the same assignment.

Points — El Mirage Is Also a Season

Bonneville often feels like a major expedition built around a famous annual gathering. El Mirage has another personality: it is a recurring SCTA racing season.

Multiple meets let teams return, change the car, chase records and accumulate season points. Starting-line order is tied to current season standing, so the events develop continuity from one meet to the next.

That changes the rhythm of development.

A poor run does not necessarily end the year. The crew can study what happened, change gearing, revise the tune-up, repair whatever objected and come back at another meet with a slightly better theory.

That makes El Mirage especially useful to grassroots racers. It is not merely a place to make one heroic attempt. It is a place to keep working on the same problem until the car and timing slip finally begin telling the same story.

Racing is expensive enough without having to wait a year between mistakes.

The Clubs — Somebody Has to Put on the Race

The SCTA is built from member clubs, and El Mirage makes that club structure visible.

Land-speed racing does not arrive with a stadium staff waiting behind a gate. Volunteers inspect vehicles, prepare the course, patrol the lakebed, operate timing and communications, work the starting area and perform the collection of jobs required to turn public desert into an organized speed event.

That is part of why El Mirage has always felt closely connected to garage-built racing. The same broad community that brings the cars also helps make the event exist.

There is a guest-entry path for time-only participation, but regular competition is tied to the SCTA club system.

The club structure also preserves something useful in a sport where many machines are one-off creations. Knowledge moves through the pits. Somebody has fought the same cooling problem, gearing question, tire issue or inspection requirement before.

The fellow lending the tool may still want your record.

He would rather beat the car while it is running.

Before the Run — Inspection and Rookie Orientation

Dry-lake racing looks informal until somebody tries to enter the course.

Vehicles have to register and pass technical inspection. Drivers have licensing requirements appropriate to the speeds they intend to run. New El Mirage drivers go through rookie orientation before being released onto the course.

That orientation exists because an open lakebed has fewer obvious visual instructions than a permanent racetrack. The driver and crew need to understand the course markers, starting procedure, shutdown area, patrol system and where the race vehicle is supposed to go after the timing lights.

At 150 mph, the desert is large.

At 250, the useful part becomes surprisingly narrow.

Progressive driver licensing also keeps speed from arriving faster than experience. A driver proves capability at lower speed ranges before moving into higher ones.

The objective is not to make land-speed racing bureaucratic.

It is to make sure everybody understands the same desert before somebody opens the throttle.

The Surface Can End the Meet Before the Engine Does

A dry lake works only while it remains dry enough and sound enough to race.

Rain can close El Mirage to vehicle use, and organized racing depends on the course remaining suitable. Driving on a wet lakebed can damage the surface, while mud and standing water make the idea of a high-speed run self-correcting.

Wind is another concern. A crosswind can push a high-speed car off line or make a machine with a large side area considerably more interesting than its builder intended.

Heat matters too. El Mirage sits in the Mojave Desert, and summer does not arrive there with subtle intentions. Hot air reduces density, which can reduce naturally aspirated engine power. Drivers and crews have their own cooling requirements and cannot be stored behind a radiator.

Then there is dust. It gets into equipment, onto cars and anywhere else an opening was carelessly left available.

Bonneville sends salt home with the crew.

El Mirage sends part of the desert.

The Pits Feel Like Hot Rodding Never Left Home

One of El Mirage’s strengths is that the machinery does not need to share one visual language.

A traditional roadster can sit near a streamlined motorcycle, a production coupe, a lakester, a blown sedan or a machine whose body seems to have been designed after everybody agreed doors were unnecessary.

The pits reveal how personal the sport remains. Many cars are built, maintained and developed by small teams rather than enormous professional organizations. Push vehicles, open trailers, hand-built brackets and expensive engines can occupy the same patch of dirt without anybody finding the combination contradictory.

There is also enough history in the place that traditional dry-lakes machinery does not look like a costume. A flathead-powered roadster belongs because racers were solving this same basic problem with flatheads when much of modern motorsport was still deciding where to put the hay bales.

The old cars are not there merely to demonstrate the past.

Some of them are still trying to improve its record.

One Meet Teaches You What to Change for the Next One

El Mirage rewards development because the season gives racers repeated chances to test an idea, read the timing slip and come back with a better one.

The short dirt course exposes problems quickly. Does the car launch cleanly? Does the engine pull the planned gear? Does it stay straight as speed rises? Do temperatures remain under control? Does the parachute work? Can the driver complete the shutdown without turning the return trip into another event?

One meet can answer enough of those questions to change the next one. Gearing gets revised. Power delivery gets softened or sharpened. Cooling gets improved. Weight moves. A problem that looked theoretical in the garage becomes very specific once the timing slip arrives.

Some racers also use that development to prepare for longer-course competition at Bonneville, but El Mirage does not need another venue to justify the work. Its own records, points and repeated meets provide plenty of reasons to get the answer right here.

A car that survives one theory at El Mirage earns the privilege of being introduced to the next one.

Reading an El Mirage Run

Start with the launch because the course is short enough that a poor beginning follows the car all the way to the timer.

Watch the driven tires. A little movement on dirt is not surprising, but sustained wheelspin means distance is being spent without the matching increase in vehicle speed. Listen to the engine as the car works through the gears. A clean rise in rpm followed by decisive shifts suggests the gearing and power band are cooperating.

Then watch the line. The car should settle as speed increases rather than begin wandering across the course. Repeated corrections can point toward traction, alignment, surface or aerodynamic-stability problems.

Near the far end, ask whether the engine still sounds as though it is pulling. A car that reaches the timing lights hard against its rpm limit may want more gear. One still struggling to reach useful rpm may already have too much.

Finally, put the speed in context. What class? What existing record or minimum? Was the car chasing points, a license, a new record or simply information for the next change?

At El Mirage, 180 mph can be disappointing, excellent or a new name in the record book.

The dirt provides the number.

The class explains it.

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