What Does a Turbo Timer Do?

When a turbocharged engine is driven hard, the turbocharger can reach extremely high temperatures.

Immediately shutting off the engine after aggressive driving can:

• Trap hot oil inside the turbo
• Increase oil coking
• Accelerate bearing wear
• Reduce turbocharger lifespan

A turbo timer allows the engine to continue idling after the key is removed, giving oil and coolant time to circulate and remove excess heat.

Why Turbo Timers Became Popular

Turbo timers exploded in popularity during the golden age of JDM tuning.

Popular applications included:

• Nissan Skyline GT-R
• Toyota Supra
• Mitsubishi Eclipse GSX
• Mitsubishi Lancer Evolution
• Subaru WRX STI
• Nissan 240SX SR20DET Swaps
• Mazda RX-7
• Toyota MR2 Turbo

Back when every modified car seemed to have a boost gauge, blow-off valve, and giant exhaust tip, a turbo timer was almost mandatory.

Automatic Cool-Down Function

The primary feature is automatic post-drive idling.

Benefits

• Protects turbo bearings
• Reduces heat soak
• Improves oil circulation
• Helps prevent oil coking

The system automatically determines the appropriate idle duration based on operating conditions.

Manual Timer Mode

For enthusiasts who prefer direct control, the timer includes:

Adjustable Idle Times

• 0 seconds
• Up to 10 minutes

Adjustment Range

• 16 selectable increments

This allows drivers to customize cooldown periods based on:

• Driving style
• Turbo size
• Track use
• Ambient temperatures

Built-In Digital Monitoring Functions

Unlike basic turbo timers, this unit also provides several useful engine-monitoring features.

Air/Fuel Value Display

Allows monitoring of fuel mixture data when properly connected.

O2 Sensor Voltage

Displays oxygen sensor readings.

Battery Voltage

Monitors charging system voltage.

Countdown Display

Shows remaining timer duration.

Blue Digital LED Display

The timer features:

Display Style

• Blue digital LED

Benefits include:

• Easy readability
• Classic tuner-car appearance
• Nighttime visibility
• Retro JDM aesthetic

For many enthusiasts, the glowing display alone is enough nostalgia to justify the purchase.

Universal Compatibility

Fitment

• Universal 12-volt vehicles

Compatible with:

• Turbocharged vehicles
• Naturally aspirated vehicles
• Import platforms
• Domestic platforms
• Custom builds

Any vehicle with a switched 12V ignition source can potentially utilize the timer.

Useful for Naturally Aspirated Cars Too

While turbo timers are traditionally associated with turbocharged engines, naturally aspirated owners may also find value.

Potential uses include:

• Cabin warming
• Cabin cooling
• Remote-style idle operation
• Engine warm-up periods

Although modern remote-start systems have largely replaced this function, it remains useful in some applications.

What’s Included?

Package Contents

• Control Unit
• Relay Unit
• English Installation Guide

Additional installation supplies may be required.

Installation Considerations

The package does not include:

• Zip ties
• Double-sided tape
• Electrical taps
• Splice connectors
• Mounting accessories

Professional installation is recommended for users unfamiliar with automotive wiring.

Pros and Cons

Pros

• Helps protect turbochargers
• Adjustable idle times
• Automatic timer function
• Air/Fuel monitoring capability
• O2 sensor monitoring
• Battery voltage display
• Universal compatibility
• Classic JDM appearance

Cons

• Wiring required
• Additional installation hardware not included
• Modern water-cooled turbos reduce the need for turbo timers
• Some local laws prohibit unattended idling

Frequently Asked Questions

Do modern turbo cars still need a turbo timer?

Many modern turbocharged vehicles use water-cooled turbochargers and sophisticated cooling strategies that reduce the need for turbo timers. However, they can still be beneficial for heavily modified applications.

Can this be installed on a naturally aspirated car?

Yes. The timer is compatible with most 12-volt vehicles.

Does it display battery voltage?

Yes. Battery voltage monitoring is one of its built-in functions.

Is this a direct plug-and-play installation?

No. Wiring connections are required.

Final Thoughts

The Universal Apexi Auto Timer remains one of the most iconic electronic upgrades from the golden era of import tuning. Combining turbo protection, engine monitoring functions, and unmistakable JDM nostalgia, it continues to appeal to enthusiasts building classic turbocharged projects and period-correct street cars.

Because nothing says “2002 tuner culture” quite like parking your car, taking the keys with you, and having the engine casually continue running while confused bystanders wonder if you forgot something.