Engine Parts - EFI Upgrade Kits

500 EFI Tuned & Bored Throttle Body 1000CFM
Your Price:
$629.99

500 EFI Tuned & Bored Throttle Body 1000CFM

620-15530

500 EFI Tuned & Bored Throttle Body 1000CFM

Hardin Marine has taken your factory Mercury Racing EFI throttle body and combined their precision machining and tuning experience into a power producing option for all Mercury 500/525 EFI applications. High flow throttle bodies wake these engines up.

These “Monoblade” flow 1000 CFM to match Mercury’s 525HP EFI engine. The “Monoblade” has self lubricating bronze bushings for the shaft to rotate on, knife edged stainless steel throttle blade, Stock OEM sensors and throttle cable mounts in the original location. 25 HP gain is available with recalibration of the ecu and the throttle valve. Port matching to the plenum chamber and the center divider is required to be removed from the inlet of manifold allowing room for the throttle body blade to move freely.

Now that the units match the 525 efi size. This takes a 525 gasket where it mates to the manifold not the original o-ring that the 500s had. One bolt hole needs to be clearance d slightly once the gasket is laid on the throttle body. The front is machined and drilled/tapped 5/16 fine thread and now accepts the 525 flame arrestor.

Optional High Flow flame arrestor is suggested #625-5250

Note: You will have to remove and send in your throttle body to have this process done. This is not a shelf item. Please call our technical staff for any questions or assistance on the process.

Sold as an Exchange, $500.00 Core Charge.

HP525 Bored Throttle Body 1300CFM
Your Price:
$629.99

HP525 Bored Throttle Body 1300CFM

620-15535

HP525 Bored Throttle Body 1300CFM 

Hardin Marine has taken your factory Mercury Racing EFI throttle body and combined their precision machining and tuning experience into a power producing option for all Mercury 500/525 EFI applications.

These throttle Bodies reinstall easily providing an OEM fit while offering improved performance and quality than the stock OEM units. A factory stock 1080CFM unit is CNC Machined, Ported, and finally flowed to 1308CFM. A new larger precision knife blade style throttle blade is then hand contoured and (Blue Printed) to the throttle body bore. This delivers Increased airflow, improved throttle response, as well as 10-15 additional horsepower. These units are sold on an exchange basis. Note an aftermarket flame arresstor is suggested (Part #625-5250)  due to the increased throttle bore opening size 

Note: You will have to remove and send in your throttle body to have this process done. This is not a shelf item. Please call our technical staff for any questions or assistance on the process.

525 HP EFI Stage 1
Your Price:
$755.99

525 HP EFI Stage 1

485CM-525HP

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.


496 HO Stage 1
Your Price:
$660.99

496 HO Stage 1

485CM-496HO

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.


496 HO Stage 1 (DTS)
Your Price:
$660.99

496 HO Stage 1 (DTS)

485CM-496HOD

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.


496 Mag Stage 1
Your Price:
$660.99

496 Mag Stage 1

485CM-496MAG

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.


496 Mag Stage 1 (DTS)
Your Price:
$660.99

496 Mag Stage 1 (DTS)

485CM-496MAGD

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.


496 Magnum Base Stage 2 Kit
Your Price:
$707.99

496 Magnum Base Stage 2 Kit

485MK-5350

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
Your Price:
$707.99

496 Magnum HO Stage 2 Kit

485MK-5355

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.


8.2/502 Mag Base (DTS/ETC) Stage 1
Your Price:
$755.99

8.2/502 Mag Base (DTS/ETC) Stage 1

485CM-82MAG1D

8.2/502 Mag Base (DTS/ETC) Stage 1

A whopping 50 horsepower and 35 foot pounds of torque increase while maintaining use of 89 octane. This works with both the mechanical cable and digital throttle (DTS) as well as engines equipped with and without catalytic converters. This performance calibration of the stock PCM features a 250 RPM limiter increase and a revised fuel and spark curve to better enhance performance.

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


8.2/502 Mag Base (DTS/ETC) Stage 2
Your Price:
$850.99

8.2/502 Mag Base (DTS/ETC) Stage 2

485CM-82MAG2D

8.2/502 Mag Base (DTS/ETC) Stage 2

A whopping 75 horsepower and 55 foot pounds of torque increase with the use of 91 (or higher) octane. This works with both the mechanical cable and digital throttle (DTS) as well as engines equipped with and without catalytic converters. This performance calibration of the stock PCM features a 450 RPM limiter increase and a revised fuel and spark curve to better enhance performance.

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


8.2/502 Mag Base (Mechanical Throttle) Stage 1
Your Price:
$755.99

8.2/502 Mag Base (Mechanical Throttle) Stage 1

485CM-82MAG1

8.2/502 Mag Base (Mechanical Throttle) Stage 1

A whopping 50 horsepower and 35 foot pounds of torque increase while maintaining use of 89 octane. This works with both the mechanical cable and digital throttle (DTS) as well as engines equipped with and without catalytic converters. This performance calibration of the stock PCM features a 250 RPM limiter increase and a revised fuel and spark curve to better enhance performance.

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


8.2/502 Mag Base (mechanical throttle) Stage 2
Your Price:
$850.99

8.2/502 Mag Base (mechanical throttle) Stage 2

485CM-82MAG2

8.2/502 Mag Base (mechanical throttle) Stage 2

A whopping 75 horsepower and 55 foot pounds of torque increase with the use of 91 (or higher) octane. This works with both the mechanical cable and digital throttle (DTS) as well as engines equipped with and without catalytic converters. This performance calibration of the stock PCM features a 450 RPM limiter increase and a revised fuel and spark curve to better enhance performance.

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


8.2/502 Mag HO (DTS/ETC) Stage 1
Your Price:
$755.99

8.2/502 Mag HO (DTS/ETC) Stage 1

485CM-82HO1D

8.2/502 Mag HO (DTS/ETC) Stage 1

While the HO version of the 8.2 makes significantly more power than the Base models, after extensive testing, we found another 10 horsepower and 15 foot pounds of torque while using 89 octane fuel. This cal offers a 200 rpm increase on the rev limiter for more prop options, as well as a modified spark and fuel curve for better acceleration and top speed.

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


8.2/502 Mag HO (DTS/ETC) Stage 2
Your Price:
$850.99

8.2/502 Mag HO (DTS/ETC) Stage 2

485CM-82HO2D

8.2/502 Mag HO (DTS/ETC) Stage 2

While the HO version of the 8.2 makes significantly more power than the Base models, after extensive testing, we found another 25 horsepower and 35 foot pounds of torque while using 91 octane fuel. This cal offers a 300 rpm increase on the rev limiter for more prop options, as well as a modified spark and fuel curve for better acceleration and top speed.

If your modifying your engine with upgrades such as headers, camshafts or complete custom builds, we can work with your custom needs to get the factory PCM working properly.

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


8.2/502 Mag HO (mechanical throttle) Stage 1
Your Price:
$755.99

8.2/502 Mag HO (mechanical throttle) Stage 1

485CM-82HO1

8.2/502 Mag HO (mechanical throttle) Stage 1

While the HO version of the 8.2 makes significantly more power than the Base models, after extensive testing, we found another 10 horsepower and 15 foot pounds of torque while using 89 octane fuel. This cal offers a 200 rpm increase on the rev limiter for more prop options, as well as a modified spark and fuel curve for better acceleration and top speed.

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


8.2/502 Mag HO (mechanical throttle) Stage 2
Your Price:
$850.99

8.2/502 Mag HO (mechanical throttle) Stage 2

485CM-82HO2

8.2/502 Mag HO (mechanical throttle) Stage 2

While the HO version of the 8.2 makes significantly more power than the Base models, after extensive testing, we found another 25 horsepower and 35 foot pounds of torque while using 91 octane fuel. This cal offers a 300 rpm increase on the rev limiter for more prop options, as well as a modified spark and fuel curve for better acceleration and top speed.

If your modifying your engine with upgrades such as headers, camshafts or complete custom builds, we can work with your custom needs to get the factory PCM working properly.

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


Mercury 4.3L Stage 1
Your Price:
$660.99

Mercury 4.3L Stage 1

485CM-43L

Mercury 4.3L Stage 1

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


Mercury 6.2MX MPI Stage 1 (DTS)
Your Price:
$660.99

Mercury 6.2MX MPI Stage 1 (DTS)

485CM-62MX

Mercury 6.2MX MPI Stage 1 (DTS)

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


Mercury Racing 600 SCI Stage 1
Your Price:
$1,990.99

Mercury Racing 600 SCI Stage 1

485CM-600SCI

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.