Engine Parts - EFI Upgrade Kits

Computer Re-Calibration & Monitoring (ECU) - Non Supercharged Engines

Have you modified your stock Mercury EFI engine by adding high performance exhaust, a bigger cam, a high flow flame arrestor, or added a supercharger?

Hardin Marine can recalibrate your Mercury ECU (computer) to yield the very most of your engines power The ECU precisely controls fuel requirements, detonation control, idle speed and RPM limitations We have dyno-tested multiple combinations and know what works! Call us with your application requirements and we will lead you to maximum horsepower from you EFI engine Allow approximately 4-7 days turn around time.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

*** We Do not offer any outboard tuning options***

ECM 555 Computer Re-Calibration & Monitoring (ECU) - 496 Mag and HO, 525 Non Supercharged Engines

Have you modified your stock Mercury EFI engine by adding high performance exhaust, a bigger cam, a high flow flame arrestor, oradded a supercharger?

Hardin Marine can recalibrate your Mercury ECU (computer) to yield the very most of your engines power The ECU precisely controls fuel requirements, detonation control, idle speed and RPM limitations We have dyno-tested multiple combinations and know what works! Call us with your application requirements and we will lead you to maximum horsepower from you EFI engine. Allow approximately 4-7 days turn around time.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

"SE" Special Edition Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines

This kit is an excellent choice for those just beginning performance modifications on a MerCruiser Magnum EFI Series engine. This kit includes the "SE" Special Edition flame arrestor that utilizes a high flow K&N clamp-on style filter element and high velocity air inlet adapter which increases air flow by as much as 20%. The included Flow Command adjustable fuel pressure regulator allows you to tune to the proper air flow by allowing adjustments from 25 to 65 PSI.

"SS" Sport Series Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines

Do you want quicker acceleration, faster planing, and increased performance of up to 15 HP? If so, the "SS" Super Sport tuning kit for your MerCruiser Magnum MPI engine is what you need. This kit includes the "SS" Sport Series flame arrestor that utilizes a clamp-on style K&N element with our high velocity style air inlet. This kit include re-programming of your factory ECU in which we will modify both the fuel and spark curves as well as increasing your rev limiter and injector timing to 5400 RPM. This kit also comes with an adjustable billet Flow Command fuel pressure regulator that allows you to tune your air fuel mixture for optimum performance.

NOTE: You will need to send us your ECU with this questionnaire for re-calibration.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

Stage 1 Upgrade for Mercury 525 EFI

Performance computer re-calibration and a Custom High flow Billet Flame Arrestor that increases the maximum power by more than 25 HP* and 30 pounds of torque*. This upgrade will not only improve overall top end power but it also increases the low end power for a decrease in on to plane time and a gain in acceleration you can feel. The Preset Mercury racing factory rpm limit is also increased from 5400 to 6000 this is the point the the factory power band peaks.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

496 HO Stage 1

With full PCM control, we can offer customers many different options for stock and modified engines. Whether its the Stage 1 and 2 packages or custom calibrations for your application, we can easily handle it with incredible accuracy and a ultra fast turn-around time.

The Stage 1 system is a computer re-calibration that increases the maximum rpm level while maintaining a conservative timing curve for 89-octane gas. This calibration is designed to be conservative and reliable like stock, but a higher maximum rpm level for more prop selection. Stage 1 achieves only modest power increases such as 8-10 foot-pounds of torque and 8-10 horsepower.

Key features:
• 5450 RPM limit (5250 on Base models)
• 89 octane safe

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

496 HO Stage 1 (DTS)

With full PCM control, we can offer customers many different options for stock and modified engines. Whether its the Stage 1 and 2 packages or custom calibrations for your application, we can easily handle it with incredible accuracy and a ultra fast turn-around time.

The Stage 1 system is a computer re-calibration that increases the maximum rpm level while maintaining a conservative timing curve for 89-octane gas. This calibration is designed to be conservative and reliable like stock, but a higher maximum rpm level for more prop selection. Stage 1 achieves only modest power increases such as 8-10 foot-pounds of torque and 8-10 horsepower.

Key features:
• 5450 RPM limit (5250 on Base models)
• 89 octane safe

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

496 Mag Stage 1

With full PCM control, we can offer customers many different options for stock and modified engines. Whether its the Stage 1 and 2 packages or custom calibrations for your application, we can easily handle it with incredible accuracy and a ultra fast turn-around time.

The Stage 1 system is a computer re-calibration that increases the maximum rpm level while maintaining a conservative timing curve for 89-octane gas. This calibration is designed to be conservative and reliable like stock, but a higher maximum rpm level for more prop selection. Stage 1 achieves only modest power increases such as 8-10 foot-pounds of torque and 8-10 horsepower.

Key features:
• 5450 RPM limit (5250 on Base models)
• 89 octane safe

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

496 Mag Stage 1 (DTS)

With full PCM control, we can offer customers many different options for stock and modified engines. Whether its the Stage 1 and 2 packages or custom calibrations for your application, we can easily handle it with incredible accuracy and a ultra fast turn-around time.

The Stage 1 system is a computer re-calibration that increases the maximum rpm level while maintaining a conservative timing curve for 89-octane gas. This calibration is designed to be conservative and reliable like stock, but a higher maximum rpm level for more prop selection. Stage 1 achieves only modest power increases such as 8-10 foot-pounds of torque and 8-10 horsepower.

Key features:
• 5450 RPM limit (5250 on Base models)
• 89 octane safe

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

496 Magnum Base Stage 2 Kit

With full PCM control, we can offer customers many different options for stock and modified engines. Whether its the Stage 1 and 2 packages or custom calibrations for your application, we can easily handle it with incredible accuracy and a ultra fast turn-around time.

The Stage 2 maximizes the power output of the stock engine by running 91 octane or better, increasing the maximum spark advance, increased ignition power from the individual coils, denser air charge from the low temp thermostat and maximized air-fuel ratio in each individual cylinder. Calibration increases torque levels throughout the entire rpm curve while making more peak hp for increased speeds.

Key features:
• Hi-performance PCM calibration
• Low-temp thermostat
• 5450 RPM limit
• 5% - 8% power increase over stock
• Increased acceleration with increased torque output

NOTE: You will have to remove and send in your ECU to have this process done.

496 Magnum HO Stage 2 Kit

With full PCM control, we can offer customers many different options for stock and modified engines. Whether its the Stage 1 and 2 packages or custom calibrations for your application, we can easily handle it with incredible accuracy and a ultra fast turn-around time.

The Stage 2 maximizes the power output of the stock engine by running 91 octane or better, increasing the maximum spark advance, increased ignition power from the individual coils, denser air charge from the low temp thermostat and maximized air-fuel ratio in each individual cylinder. Calibration increases torque levels throughout the entire rpm curve while making more peak hp for increased speeds.

Key features:
• Hi-performance PCM calibration
• Low-temp thermostat
• 5450 RPM limit
• 5% - 8% power increase over stock
• Increased acceleration with increased torque output

NOTE: You will have to remove and send in your ECU to have this process done.

525 HP EFI Stage 1

The Stage 1 system is a computer re-calibration that increases the maximum power by more than 25 HP and 30 pounds of torque.  This also increases the low rpm power range for a decrease in plane time and a noticeable gain in acceleration. The factory rpm limiter is also increased, giving customers the ability to increase top speed MPH with proper propping. The stock RPM limit of 5400 is modified to 6000 rpm where peak power ends.

Key features:
• Hi-performance PCM calibration with MPH gains of 1-3mph
• Increased horsepower for increased top speed MPH
• Increased low-speed torque for decreased plane time
• Increased low, mid and high speed torque for better acceleration and throttle response
• Increased spark at low and mid speeds for increased engine efficiency
• 6000 RPM limit vs. stock 5400 RPM limit giving increased propping range and increased horsepower
• 91 octane safe (RON+MON)/2
• Stock idle, starting and drive-ability is maintained
• Fully compatible with all Smartcraft equipped vessels
• Custom calibrations available upon request

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

Mercury 6.2MX MPI Stage 1 (DTS)

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

Mercury Racing 600 SCI Stage 1

The Stage 1 system is a computer re-calibration that increases the maximum power by more than 100 HP* and 90 pounds of torque*. Increases the low rpm power range for a significant decrease in plane time and a noticeable gain in acceleration. The factory rpm limiter is also increased, giving customers the ability to greatly increase top speed MPH while running original props. The stock RPM limit of 5400 is modified to 5850 rpm where peak power ends.

Key features:
• Hi-performance PCM calibration with MPH gains of 5-8mph**
• Increased horsepower for increased top speed MPH
• Increased low-speed torque for decreased plane time
• Increased low, mid and high speed torque for better acceleration and throttle response
• Increased spark at low and mid speeds for increased engine efficiency
• 5850 RPM limit vs. stock 5400 RPM limit giving increased propping range and increased horsepower
• 91 octane safe (RON+MON)/2
• Stock idle, starting and drive-ability is maintained

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

Mercury Racing 600 SCI Stage 2

The Stage 2 system boasts even more power than stage 1 by coupling a Stage 2 performance calibration with a stage 2 supercharger pulley. The Stage 2 system also includes a simple bolt on water system upgrade to increase system pressure and intercooler efficiency. This system helps boost the engines output by more than 150 HP* and 130 pounds of torque*. Also increases the low rpm power range for significant decrease in plane time and a healthy gain in acceleration. The factory rpm limiter is also increased, giving customers the ability to greatly increase top speed MPH while running original props. The stock RPM limit of 5400 is modified to 5850 rpm where peak power ends.

Key features:
• Hi-performance PCM calibration with MPH gains of 7-10mph**
• Intercooler water re-route
• Increased horsepower for increased top speed MPH
• Increased low-speed torque for decreased plane time
• Increased low, mid and high speed torque for better acceleration and throttle response
• Increased spark at low and mid speeds for increased engine efficiency
• 5850 RPM limit vs. stock 5400 RPM limit giving increased propping range and increased horsepower
• 91 octane safe (RON+MON)/2
• Stock idle, starting and drive-ability is maintained

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

Mercury Racing 600 SCI Stage 3

The Stage 3 system boasts even more power than stage 2 system by coupling a Stage 3 performance calibration with a high-flow flame arrestor element. The high-flow flame arrestor replaces the stock paper gauze style arrestor with a stainless steel mesh arrestor for increased airflow. This system helps boost the engines output by more than 170 HP* and 140 pounds of torque*. Also increases the low rpm power range for significant decrease in plane time and a healthy gain in acceleration. The factory rpm limiter is also increased, giving customers the ability to greatly increase top speed MPH while running original props. The stock RPM limit of 5400 is modified to 5850 rpm where peak power ends.

Key features:
• Hi-performance PCM calibration with MPH gains of 8-12mph**
• Intercooler water re-route
• Increased horsepower for increased top speed MPH
• Increased low-speed torque for decreased plane time
• Increased low, mid and high speed torque for better acceleration and throttle response
• Increased spark at low and mid speeds for increased engine efficiency
• 5850 RPM limit vs. stock 5400 RPM limit giving increased propping range and increased horsepower
• 91 octane safe (RON+MON)/2
• Stock idle, starting and drive-ability is maintained

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

Mercury Racing 600 SCI Stage 4

The Stage 4 system boasts even more power than stage 3 by coupling a Stage 4 performance calibration with a stage 4 supercharger pulley and stage 4 camshaft kit. The camshaft works well with all stock valve train for a very simple swap. The Stage 4 system also includes a simple bolt on water system upgrade to increase system pressure and intercooler efficiency. This system helps boost the engines output by more than 290 HP* and 225 pounds of torque*. Also increases the low rpm power range for significant decrease in plane time and a stunning gain in acceleration. The factory rpm limiter is also increased, giving customers the ability to greatly increase top speed MPH while running original props. The stock RPM limit of 5400 is modified to 6000 rpm where peak power ends.

Key features:
• Hi-performance PCM calibration with MPH gains of 15-20mph**
• High flow intercooler fittings (10AN)
• High-flow billet flame arrestor
• 10-Rib Gates supercharger belt
• Increased horsepower for increased top speed MPH
• Increased low-speed torque for decreased plane time
• Increased low, mid and high speed torque for better acceleration and throttle response
• Increased spark at low and mid speeds for increased engine efficiency
• Stage 4 camshaft to produce more power throughout the rpm range
• Colder NGK Racing spark plugs
• 6000 RPM limit vs. stock 5400 RPM limit giving increased propping range and increased horsepower
• 91 octane safe (RON+MON)/2
• Stock idle, starting and drive-ability is maintained

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

Mercury Racing 662 SCI Stage 1

The Stage 1 system is a computer re-calibration that increases the maximum power by more than 95 HP* and 90 pounds of torque*. Also increases the low rpm power range for a significant decrease in plane time and a noticeable gain in acceleration. The factory rpm limiter is also increased, giving customers the ability to greatly increase top speed MPH while running original props. The stock RPM limit of 5400 is modified to 6000 rpm where peak power ends.

Key features:
• Hi-performance PCM calibration with MPH gains of 4-7mph**
• Increased horsepower for increased top speed MPH
• Increased low-speed torque for decreased plane time
• Increased low, mid and high speed torque for better acceleration and throttle response
• Increased spark at low and mid speeds for increased engine efficiency
• 6000 RPM limit vs. stock 5400 RPM limit giving increased propping range and increased horsepower
• 91 octane safe (RON+MON)/2
• Stock idle, starting and drive-ability is maintained

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.

Mercury Racing 662 SCI Stage 2 (Cal, Pulley, Belt)

The Stage 2 system boasts even more power than stage 1 by coupling a Stage 2 performance calibration with a stage 2 supercharger pulley. The Stage 2 system also includes a simple bolt on water system upgrade to increase system pressure and intercooler efficiency. This system helps boost the engines output by more than 170 HP* and 130 pounds of torque*. Also increases the low rpm power range for significant decrease in plane time and a healthy gain in acceleration. The factory rpm limiter is also increased, giving customers the ability to greatly increase top speed MPH while running original props. The stock RPM limit of 5400 is modified to 6000 rpm where peak power ends.

Key features:
• Hi-performance PCM calibration with MPH gains of 6-10mph**
• Intercooler water re-route
• Increased horsepower for increased top speed MPH
• Increased low-speed torque for decreased plane time
• Increased low, mid and high speed torque for better acceleration and throttle response
• Increased spark at low and mid speeds for increased engine efficiency
• 6000 RPM limit vs. stock 5400 RPM limit giving increased propping range and increased horsepower
• 91 octane safe (RON+MON)/2
• Stock idle, starting and drive-ability is maintained

NOTE: You will have to remove and send in your ECU to have this process done.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.