Castle Creations Ghost RC Perfect Pass RC Cobra 5 ACE HV & 2028 1700KV Motor Combo

Before purchasing, please read all disclaimers regarding warranty and product use warnings for this motor.

The Castle 2028-1700KV motor paired with the Cobra 5 ACE HV ESC forms one of the most advanced and capable power systems available for high-speed 1/7 and 1/8-scale applications - only with 12S. Designed for users chasing extreme acceleration and maximum top-end performance, this combo delivers massive torque, exceptional stability, and the electrical support needed for demanding speed-run setups.

This system is intended for experienced RC hobbyists only, especially those building high-output speed cars, drag racing platforms, or aggressively geared street machines. When configured correctly, the combination offers blistering performance far beyond standard large-scale systems - while maintaining the control, efficiency, and data-driven tuning required for safe, consistent passes.

CONTROLLER

Unleash the Power of Cobra 5 ACE HV

Engineered by Castle Creations, Ghost RC, and Perfect Pass RC, the Cobra 5 ACE HV 12S ESC is the most advanced controller ever built for RC drag racing and speed runs. Designed for serious high-voltage builds and precision launches, it delivers unmatched performance with cutting-edge features that no other ESC offers.

KEY FEATURES

• 6S–12S LiPo / 50.4V capable – Extreme high-voltage performance for speed runs & drag racing
• Perfect Pass throttle ramping – Time-based launch control (0.1s–25s) for smooth, repeatable starts
• Boost, turbo timing & rev limiter – Fully adjustable for drag & speed run domination
• Advanced data-logging & G-force meter – Capture every run, analyze performance
• 6 AWG power wires & 8mm motor connectors – Heavy-duty build for maximum current flow
• Enhanced cooling design – Heat sink, high-output fan, and Cryo-Drive technology

Why Choose Cobra 5 ACE HV?

Whether you’re chasing 200+ mph passes or battling for the win on the drag strip, the Cobra 5 ACE HV is purpose-built to deliver. With Perfect Pass launch control built in, you get the smoothest acceleration ramp in RC — no more wheelspin, no more wasted launches. Pair that with 12S sensored precision and advanced tuning options, and you’ve got an ESC engineered for record-breaking speed.

⚠️ This ESC is intended for advanced RC enthusiasts only.

• No built-in safety protections (thermal shutdown, low-voltage cutoff, etc.)
• No warranty – users must ensure proper wiring, cooling, and safe use
• Improper setup may result in ESC failure or vehicle damage

Castle is excited to continue the partnership with Ghost RC, in association with Perfect Pass RC, to introduce the Cobra 5 HV ACE. Based on Castle's new Cobra 5 HV ESC, the Ghost RC Cobra 5 HV ACE was designed for the extreme demands of 1/7th scale drag racing and high-speed applications.

Ghost RC has removed or restricted the protection features found in the Castle Cobra 5 HV. This allows the Cobra 5 HV ACE to deliver incredible amounts of power; but with great power comes great responsibility. Caution must be used in setup selection and ESC tuning. Due to the inherently aggressive nature of RC drag racing and speed running, the Ghost RC Cobra 5 HV ACE is sold with no warranty. This ESC is for advanced users only.

GHOST RC COBRA 5 ACE UNIQUE FEATURES

• Upgraded 6-gauge battery wires.
• Perfect Pass™ feature - Allows time-based throttle ramping (up to 25 seconds) for smooth acceleration.
• Sensored Only operation allow for advanced timing.
  • Boost timing up to 45° - RPM based or throttle-based activation and control.
  • Turbo timing up to 45° - Power out activation and time-based control.
• Advanced Start Power
  • Start Power controls off the line acceleration.
  • Start Power Ramp Time controls how quickly start power engages.
  • Start Power Hold Time controls how long start power holds.
• RPM Limiter - Helps prevent damage to rotors in the event of driveline failure.
• Programmed Throttle Curve
  • Allows users to set a throttle curve that automatically engages at launch.
  • Time based activation that engages at an adjustable throttle input.

COBRA 5 HV ACE BASE FEATURES

• 32-Bit Processing power for smoother motor control and improved response time.
• Enhanced Data Logging includes:
  • Double the maximum sample frequency of older generations.
  • 8x increased logging time of older generations.
  • Data point for ESC electrical motor timing.
  • Data point for acceleration via onboard accelerometer.
  • Looping feature prevents interruptions in data log recording.
  • Ability to download specific sessions.
• Highly adjustable internal BEC. (5.0V - 8.0V adjustable in 0.1V increments)
• SmartSense® and brushed motor running modes
• Access to tuning options and firmware updates for free with Castle Link V4 USB programmer included with purchase. Now with USB-C connector! (Requires Windows 10 or higher)
• Mounting holes located in bottom of aluminum case for installation into vehicle.

ADDITIONAL FEATURES

• CRYO-DRIVE™ Technology minimizes the amount of time the ESC’s electrical components spend generating heat, resulting in improved thermal performance during partial throttle operation where the majority of driving occurs
• ESC is housed in a rugged CNC aluminum case and potted in waterproof epoxy to protect the electronics and promote efficient heat transfer
• Premium forged heatsink with elliptical fins for superior air flow and increased heat dissipation
• Oversized factory equipped thermally controlled 50mm cooling fan
• Waterproof design for all weather conditions
• Auxiliary wire functionality for "on-the-fly" adjustments using your transmitter
• Audible alerts for easy diagnosis of common issues such as motor-over-temperature and low-voltage cutoff
• Convenient transmitter programming for six common adjustable settings including cutoff voltage and drag brake

MOTOR

The new GHOST RC 2028-1700KV Drag and Speed Run Motor is an upgraded version of the classic Castle 2028-1700KV, developed by Castle Creations & Ghost RC to improve reliability and consistency in extreme drag racing and speed run applications. Designed specifically for 1/5 scale drag builds, it delivers high KV performance without sacrificing torque, providing fast launches and strong top-end speed when geared appropriately. The 2028-1700KV pairs perfectly with the COBRA 5 ACE, providing an incredibly powerful racing setup.

ENHANCEMENTS FROM PREVIOUS GENERATION: 

• Larger rear bearing to provide more support at higher RPM
  
• Winding wires extend directly from the back of the motor, decreasing resistance.
• 8mm shaft extends the full length of the rotor, increase strength and balancing
• Stainless-steel wrapped rotor and ultra balanced shaft to protect in high RPM applications

This 1700KV brushless motor from Ghost RC & Castle Creations is purpose-built for high-demand straight-line driving - whether you are chasing times in drag racing or pushing top speed in speed runs, this motor is manufactured with tight tolerances, consistent magnetic alignment, and a high-efficiency rotor architecture that maintains stability at extended full-throttle pulls. Perfect Pass RC brings this unit to our catalog for builders who want competition-grade hardware with clean, predictable, repeatable power delivery - without compromise.

Key Features:

• Max. RPM: 60,000.
• 1700 KV without sacrificing torque.
• Beautiful robust construction: Built with a stainless-steel wrapped rotor and an ultra-balanced shaft to maintain integrity and stability at extreme RPM.
• Ideal for running up to 8s LiPo

Product Use Statements:

• This is an extremely powerful motor designed for advanced and experienced users ONLY!
• Below are suggestions for increasing your likelihood of success but it is not guaranteed.
• This is a VERY high RPM motor. Start with very conservative gearing (small pinion/large spur).
• Check your data logs, temperatures and setup closely after each run to ensure you are not stressing components.
• This motor is intended for single passes only; allow time between runs for the ESC and motor to cool down to ambient temperatures.
• This motor can pull very high amperages. Make sure your batteries, connectors and soldering are capable of handling the loads. Inadequate power can cause poor performance and damage the batteries and/or ESC.
• Do NOT free rev the motor with no load, particularly when running 6s or higher. The RPM output of the motor is much higher with no load as the kv and battery voltages do not drop.
• Set ESC timing to Lowest (0). This motor will pull considerably more amperage as you increase timing. This does not necessarily equate to more speed as it puts more strain on the batteries and causes the voltage to sag. Less is more sometimes.
• Do not exceed 33.6v when using this motor.
• Be sure your pinion and motor bullets are secure before and after each run.

WARRANTY: Due to the abusive nature of drag racing and speedrun setups, Castle is not liable for incidental or consequential damages to other equipment such as ESCs and batteries when using this motor and is not responsible for failures resulting from abuse, improper installation, misapplication or alteration, NO WARRANTY!

WARNING: Drag and speed run setups are inherently abusive and extremely hard on all electronic components. Every component in the configuration can be strained, weakened (or worse) without using extreme caution, observance of electric theory and advanced knowledge of all aspects of the RC hobby. High speed runs and drag racing are the most advanced, aggressive and volatile applications in the RC car hobby. Improper setup or use of this product can result in catastrophic failures of the motor, ESC and/or batteries and yourself!