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SBG Competition Electric Water Pump Kit (FD3S RX-7)

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  • Image 1
  • NEW Davies Craig LCD EWP & Fan Digital Controller (DC-8000)
  • NEW Davies Craig LCD EWP & Fan Digital Controller (DC-8000)
  • Detail of the engine side of our coolant flow plate
  • Contoured and tapered flow path
  • Comparison of the stock water pump to our electric water pump
  • Our electric water pump has a more efficient impeller design
  • The coolant flow plate drastically reduces turbulence by eliminating many of the vortices formed in the coolant flow path
  • The coolant flow plate bolts directly up to your stock water pump housing without any modifications
  • Our electric water pump is located as low as possible in the system
  • Image 11

 Product Description


Turbocharge your cooling system -  SakeBomb Garage Competition Electric Water Pump Kit

SakeBomb Garage Competition Electric Water Pump Features from sakebombgarage on Vimeo.

We’ve been working on refining this design for the better part of a year now and are finally happy to make all of the R/D that went into this setup available to the rotary community.  For years we battled with cooling related issues with the RX7.  Adding high efficiency dual oil coolers really helped the situation but at the end of the day the FD still suffers from problems related to the lack of foresight with the stock water cooling system. 

The first issue with the cooling system is the mechanical pump itself.  The OEM pumps are (for lack of a better term) garbage with the impeller made from folded sheet metal.  Up until this year we've been using the Mazmart RE-medy machined mechanical pumps, however no impeller can be designed for optimal flow at all RPMs... the pump will either under-flow at low RPM's or cavitate at high RPM's.  The issue is that the pump, being mechanically connected to the motor, operates regardless of temperature and is forced to spin outside of its optimal range.

So, if you’re overheating but your motor speed drops, you’re now moving less coolant when you need it most.  Temperature, load, and RPM all become irrelevant factors with a mechanical pump tied to the crank pulley; it’s just along for the ride.  The mechanical pump just does whatever the motor is doing and robs power to do it regardless of how much or little that pump really needs to be working.  If we look at optimum pump speed, the mechanical waterpump is either under or overcooling, under or overspinning, or not spinning at all when you need it most (shutdown).

New OEM applications tend to favor electric waterpumps for a number of reasons, one being efficiency (no drag on the motor) and low power consumption (this one takes 8 amps max at full speed, and less as needed), but allows for other possibilities such as continuing to circulate coolant through the motor, radiator, and turbos after shutdown.  The controller module we use also has the ability to trigger the fans if the temperature set point is exceeded after ramping the pump speed up.  It’s a pretty nice piece of kit and may end up rendering the mechanical waterpump system a thing of the past. 


  • Continues cooling your engine after shutdown to prevent hotspots and boiling; the pump controller also controls your fans
  • No wax pellet thermostat to fail
  • Belt slip is now a thing of the past
  • No longer dependent on engine speed, so the pump is always flowing at optimal rate.  Flow speed is now based on temperature, not RPM; efficient in all RPM ranges
  • Goodbye turbo timers!
  • Low power draw (8 amps at full speed), frees up horsepower and increases throttle response
  • Programmable setpoints for maximum temperature and fan control; removes the need for upgraded thermosensor (such as FC thermosensor)
  • Flow optimized and contoured water pump delete plate redirects coolant flow with minimal turbulence
  • Easy to bleed the coolant system without the car being on; just use a 12V battery


  • No wax pellet thermostat, so your car may take a few minutes longer to warm up (3-4 minutes)
  • Must delete the air pump
  • MUST thoroughly bleed the cooling system for proper operation


  • 40 gallon per minute maximum flow rate
  • 72.5 psi maximum rated operating pressure
  • 8 amp maximum current draw
  • Recommended operating range of -40°F to 266°F
  • 2.6lb pump weight
  • Aluminum pump housing for improved durability
  • 7000+ hour manufacturer rated lifespan; this equates to roughly 200,000 miles at an average of 35mph
  • 1 year pump warranty


  • Prevents heat soak
    • Runs after key-off to continue circulating coolant through the motor, turbos, and radiator – this prevents hot spots and boiling
    • Can trigger fans as needed to further cool the engine even while the car is off
    • Goodbye heat soak and goodbye turbo timers
    • Pulls very little power (only 8 amps) so you won’t have to worry about your battery going flat
    • Helps save turbo seals, coolant o-rings inside the motor, and prevents warping and hot spots from lack of cooling after shutoff
  • Maximum cooling efficiency
    • Highly efficient impeller design - Optimized for maximum flow efficiency
    • Standard mechanical OEM fitment pumps can be efficient either at high RPM or low RPM, but not both. Our electric water pump is de-coupled from engine speed and is therefore efficient and effective regardless of engine speed.
  • Cooling on demand
    • Electric water pump operation is based on coolant temperature, and the controller can modulate the speed of the pump in real time based on cooling requirements.
    • Controller temperature settings are customizable
    • The fans can be activated by the pump controller to increase cooling capabilities if the controller finds that the temperature is continuing to increase so that control of the water pump and fan operation is optimized to prevent overheating.
    • Belt slip on the mechanical water pump pulley is now a thing of the past!
    • The end result of the system is the ability to activate maximum cooling even at low RPM, or after key-off.
  • Free up power and throttle response
    • Saves horsepower by removing the resistance of the mechanical water pump on the engine.  2-7hp depending on RPM.
    • Only draws a maximum of 8 amps at full speed, and less as needed.
  • 3D-optimized CNC milled billet 6061 aircraft-grade aluminum delete plate, milspec hard anodized
    • Contoured fluid path to drastically reduce turbulence and vortices forming in the water pump housing with the mechanical water pump removed
    • Months of flow testing and revisions to create bowled output to fluid passage; this reduces turbulence by preventing quickly moving coolant from hitting a flat wall rather than smoothly directed towards the coolant inlet.  The smooth flow contour aims to achieve as close to truly laminar flow as design constraints allow.  Less turbulence means less flow restrictions and therefore more efficient and effective cooling.
    • The plate has a C-ring that seats in the same beveled surface that the mechanical water pump blades do, forcing the vast majority of the coolant through the flow path rather than allowing it to whirl around, causing turbulence
  • Located in lowest possible orientation to aid in reducing trapped air, essential for operation of the pump
    • Electric water pumps are significantly more sensitive to air pockets than mechanical water pumps, so properly bleeding the cooling system is a must.  The pump is also installed as low in the engine bay as possible to help make this easier.
    • Having an electric water pump allows you to bleed the coolant system easier; with a 12V power source, you can manually circulate coolant through the engine without needing the car to be on.  (With a manual pump we found the bleeding procedure to be a multi-day process if done thoroughly.)
  • Optionally available with high quality Samco silicone hose upgrade made to spec
  • Thermosensor included with the kit
  • Correctly sized belt is included to allow for deletion of the water pump and pulley from the system
  • Milspec wire used on essential under-hood components to promote wire longevity




Upgrade to the new Davies Craig LCD EWP & Fan Digital Controller


  • NEW LCD screen
  • 12V and 24V operation
  • Visual “Live Read” thermometer allows for accurate engine temp monitoring
  • Diagnostic check & warm-up signal
  • Nine (9) targeted/set coolant temperatures, 140F (60C) to 212F (100C)
  • Flashing “EWP” logo signifying water pump in operation
  • Davies Craig Thermatic® Fan logo, circulating signifying fan in operation
  • Flashing High & Low Voltage indicators
  • Low & High Temp indicators
  • Optional Audible alarm
  • Above Set/Target Temperature indicator accompanies audible alarm
  • Temperature Sensor short & open circuit indicators
  • Automatic time-out, EWP runs for 3 minutes or until engine temp has reduced to -14F (10C) below set/targeted temp whichever occurs first

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 Product Reviews

  1. Best cooling mod

    Posted by Clayton Norman on 23rd Dec 2018

    I installed this kit (with optional wire harness) on my JDM '96 FD. Everything works exactly as the description says. So well that it commonly dips by 5-10 degrees from the set temp within seconds. I think I have my tripple pass aluminum radiator to blame for that. The "pulsing" the pump does upon the ignition switching on is probably my favorite added benefit due to my radiator's dificulty to flush air from as well. It makes burping the coolant system SIGNIFICANTLY easier and less risky. The only down side I encountered is that the precut wire option doesnt discriminate between RHD and LHD(at least as far as I can tell). Luckily all that meant for me was trimming one wire shorter, and extending 2 other wires, but be informed RHD owners. Otherwise, fantastic product and excellend R&D. I will be buying this kit again for any RX7 I end up with in the future.

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