4.0 L SOHC Supercharger kit - How To Complete - Ford Truck Enthusiasts Forums

4.0 L SOHC Supercharger kit - How To Complete

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Old 02-03-2014, 09:56 PM
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4.0 L SOHC Supercharger kit - How To Complete

So I posted these "how to" blogs in there appropriate engine categories... but then started to think the supercharger/turbocharger category makes more sense. Here it is...

If you obtain a Moddbox Installation kit and any Eaton M90 supercharger (89-95 either style inlet), follow the following instructions and you're good to go. No tune required. 100% bolt-on mod. You can get your installation kit here:
ModdBoxModdBox - Engineering your driving experience @

I've also decided to post the "final result" first. If you like it.. proceed to read the "how to".

Here's a road test of the 3.5 psi pulley equipped with no cooling equipment installed.

Here's the Dyno. 215 hp & 237 lbft at the rear wheels.

Kit Photo:

Installed Photos:


Tools Required:
Standard metric socket set
Needle Nose Pliers
T-30 Torx Bit
Fluid Funnel
Flat Head Screw Driver
...will add more soon


Stock Throttle Cable Reference Diagram

Stock EGR System Reference Diagram

Stock Intake Manifold Reference Diagram

Stock Air Box Reference Diagram

Stock Throttle Reference Diagram

Belt Diagram Reference Diagram (Dark Belt Showing the ModdBox Orientation)


ModdBox Supercharger Bypass Valve

ModdBox 255lph Fuel Pump

ModdBox Heat Shield

ModdBox 70mm Air Filter

ModdBox Throttle Cable and Cruise Control Mount

ModdBox 3.0 & 3.5 psi Supercharger Pulleys

ModdBox Supercharger Pulley Quick Adapter

ModdBox Plenum Bottom Plate

ModdBox Plenum Top Plate

ModdBox Intake Manifold

ModdBox Intake Manifold Top

ModdBox M22-1.5mm EGR Extension

Black Silicone Liquid Gasket

6pk Serpentine Belt

1/4" Electrical Loom

16 ga wire & connections

Heater Hose

Fuel Hose

Hardware and Fittings


Remove the negative battery cable (1 bolt). Secure it to the side of the battery to prevent any accidental contact with the negative terminal.

Remove the Throttle Body Cover (2 bolts). If your model is equipped with a second Crank Case Ventilation hose, you will be required to remove the hose clips on the side of the Throttle Body Cover (not shown here).

Loosen the hose clamp and disconnect the Intake Tube from the Stock Air Box Assembly.

Loosen the hose clamp and disconnect the Intake Tube from the Throttle Body.

Disconnect the Crank Case Vent Hose(s) and remove the Intake Tube. Set the Intake Tube aside for later use. Some models have a second Crank Case Vent Hose. For more information, see the Stock Setup Diagrams provided at the beginning of this instruction manual.

Remove the Brake Booster Line from the back of the Intake Manifold. Tape and label if necessary.

Unplug the cable connected to the IAC Valve.

Unbolt and remove the IAC Valve (2 bolts). Set the IAC Valve aside for later use.

Unplug the Vac line connected to the EGR. Tape and label the Vac Line if necessary.

Unbolt the EGR Valve (2 – 12mm bolts).

Remove EGR Valve by disconnecting the EGR Tube. Set the EGR Valve aside for later use.

Unplug the TPS Sensor. Tape and label the plug if necessary.

Remove the Throttle Cable from the Throttle Body Valve. The cable can be slipped free by manually actuating the valve 90 degrees and providing slack in the cable.

Unbolt the Throttle Body Valve (4 bolts). Set the Throttle Body Valve aside for later use.

Disconnect the Throttle Cable and the Cruise Control Cable.

Disconnect the electrical wire mount from the left side of the Intake Manifold.

Locate the plastic Radiator Rock Shield located underneath the engine bay. Remove the bolts and set it aside.

Locate the plastic Radiator Drain Valve at the bottom passenger side of the Radiator. Turn this plug and release only approximately a 3/4 gallon of coolant fluid (~3L). This is to allow the removal and relocation of coolant lines in the proceeding steps.

Remove the HVAC Heater Hoses (2x 1/4” diameter) and the Intake Manifold Engine Vac Line (5/8” diameter) from the Hose Connector Fitting. Tape and label the hoses if necessary.

Remove the Hose Connector Fitting. Set the Hose Connector Fitting aside for later use.

Locate the 1 5/8” diameter Radiator to Thermostat Coolant Hose.

Relocate the Coolant Hose to be in front of the Oil Cap and around the AC Line as illustrated. Cut approximately 5” to 6” off of the hose and re-secure it to the radiator.

Be sure the hose will not conflict with the belt. If not equipped with AC, secure the hose with restraining straps if necessary. Do not dispose of the 1 5/8” hose. The remaining hose will be needed in a later step.

Remove the Fuel Injection Vac Line located on the right side of the Intake Manifold. Tape and label it if necessary.

Pry off the Ignition Wire Mount located at the top of the Intake Manifold.

Unbolt the Ignition Wire Flange Mount.

With the Ignition Wire Flange Mount disconnected from the Intake Manifold, proceed to pry the Ignition Wire Flange Mount approximately 2 inches toward the driver side. This additional clearance will aid in the removal of the stock Intake Manifold as well as providing ample space for the future EGR Valve.

Unbolt the Vacuum Regulator (2 bolts) located towards the front drivers side of the Intake Manifold.

Remove the Fuel Vapor Return Line. This fitting is equipped with a simple push-style fitting. Simply push in the large curved shape and the fitting should pull off.

Remove the Throttle Cable and Cruise Control Cable Mount (2-bolts).

Loosen the Intake Manifold Bolts (12 – T30 Torx bolts). Note that these bolts do not remove completely. Once turned out of the Engine Block, the bolts remain connected to the Intake Manifold. Caution: You do not want to strip these bolts. It is advisable to inspect the Torx heads and use a vacuum to remove any dirt that may have accumulated inside the head. It may be necessary to use a machinist scribe or similar pointed object to loosen and vacuum out any dirt that may be residing inside the Torx heads before attempting to remove.

Lift out the Intake Manifold.

Caution: Do not drop anything into the Intake Ports. Before Proceeding, fill the Intake Ports with rags or paper towel. Clean and vacuum the area if necessary. Be sure to clean the Engine Block’s mating faces.

You are now ready to being modding your 4.0L J

Obtain the provided ModdBox stainless steel Supercharger Pulley Adaptor. Slip the supercharger Adapter onto your Eaton M90 Supercharger shaft until it binds (either an 89-93 oval or 94-95 rectangular style M90). The pulley is designed to have an interference fit which will cause the pulley to jam once it slips halfway onto the shaft. Use the stock Eaton M90 Supercharger lock nut to ratchet the pulley down the remaining length of the shaft until the Adapter hits the stop on the shaft. You may also want to use a press if you have one available. It is recommended that you use a low torque setting on an air or electric hammer-ratchet to suck the pulley down to the stop. If you do not have an automatic ratchet, you may carefully use a piece of soft lumber to stop the motion of the supercharger rotors. This will allow you to ratchet down the supercharger lock nut with a standard ratchet. Caution: Be sure that no debris falls into your Eaton M90 Supercharger. The tolerances on your supercharger are only a few thousandths of an inch and may be damaged if material falls or gets sucked into the supercharger housing. Even rotating the rotors by hand can often pull enough air to suck debris into the rotors. Use a vacuum to clear your rotors prior to installation.
<photo coming soon>

Obtain the provided ModdBox 6PK Custom Pulley and slip it onto the Supercharger Pulley Adaptor. Use the provided M5x16mm socket head cap screws.
<photo coming soon>

Locate the provided Black Liquid Gasket. Apply a thin bead of the gasket to the Eaton M90 Supercharger flange as illustrated.

Obtain the ModdBox Plenum Top Plate and bolt it to the base of the Eaton M90 Supercharger & Pulley Assembly. Use the provided M8x40mm socket head cap screws. Clean any excess gasket material.

Use the extra 1 5/8” diameter Radiator Hose that was remaining from a previous step. Measure out and cut a length of hose as is required for your supercharger:
For the 94’-95’ Eaton M90 Supercharger (rectangular inlet): 1-7/8”
For the 89’-93’ Eaton M90 Supercharger (oval inlet): 2-5/8”
Use one of the 2” stainless hose clamps to secure the hose to the Plenum Top Plate. Loosely place the other 2” diameter stainless hose clamp on the hose. Place the entire assembly aside for later use.

Obtain the ModdBox Plenum Base Plate. Apply a small bead of the provided Black Liquid Gasket around each Intake Port hole as shown.

Caution! The Plenum Base Plate is NOT reversible. Before placing the Plenum Base Plate on the Engine Block, be sure the wider ridge dimension (shown below) is placed at the back of the engine bay towards the firewall. If this is reversed, your supercharger pulley will not line up with your other engine pulleys.
Optional: If you have purchased a ModdBox Intercooler Kit, remove the 1/4”NPT plugs and replace them with the provided 1/4”NPT hose fittings. Refer to the ModdBox Intercooler Kit Installation Manual for further instructions.

Place the Plenum Base Plate onto the Engine Block in the correct orientation (shown in the previous step). Align the Inlet Ports with the Plenum Bottom Plate holes. Use the supplied M6x30mm socket head cap screws and loosely bolt down the Plenum Base Plate to the Engine Block (you will need to verify the alignment of the supercharger pulley before tightening the bolts).

Place and align the Eaton M90 Supercharger and Plenum Top Plate Assembly onto the Plenum Base Plate. Visually inspect the alignment of the supercharger pulley and the other engine pulleys. A miss-alignment of approximately 1/16” is acceptable due to the length of pulley to the adjacent pulleys and the lack of ribs on the idler pulley. If the alignment of your pulley is more than approximately 1/16”, you can fine tune the alignment of the Plenum Base Plate. Simply adjust the Plenum Bottom Plate as required (they are fitted with slotted holes) and torque it down to the Engine Block.
Locate the HVAC Heater Hoses (2x 1/4” diameter) that were removed from the Hose Connector Fitting and the Intake Manifold in a previous step. The hoses need to be reconnected to the Hose Connector Fitting in a new location approximately 3” above the rear-passenger side Inlet Port on the engine block (Inlet Port to combustion chamber). Review the illustration below for reference.

Cut the 1/4” diameter HVAC Heater Hose that originates from near the firewall. Be sure to leave at least a few extra inches to allow room for error. Reconnect the 1/4? diameter hose to the Hose Connector Fitting. Note: You can connect to either 1/4? barb on the fitting.

The Intake Manifold Engine Vac line (the 5/8” diameter hose that was connected to the Hose Connector Fitting and Intake Manifold) will need to be shortened and re-connected to the Hose Connector Fitting. This 5/8” Vac line consists of rubber hose AND plastic rigid tube that runs around behind the Intake Manifold. The plastic section of this line running along the firewall needs to be cut at approximately the centerline of the Intake Manifold. Reference the photo below and proceed to cut the 5/8” plastic tube. Use the provided piece of 5/8” hose (9” length) and connect one end to the 5/8” plastic line and the other to the Hose Connector Fitting. Secure both ends of the hose with a hose clamp.

(Note: the second 1/4? hose shown will be described in the next step)

Locate the remaining 1/4” diameter HVAC Heater Hose (it originates from in behind the alternator as illustrated). Remove and replace this hose with the provided 1/4” hose (24” long). Connect the other hose end to the Hose Connector Fitting. Secure both hoses with hose clamps.

Remove the rags or paper towels in your Engine Inlet Ports then proceed with the installation of the Supercharger Assembly. Apply a thin bead of Black Liquid Gasket along the Plenum Base Plate (already aligned and bolted to the Engine Block). Caution: Be sure to apply gasket material around all the bolt holes (as illustrated in the photo below). The gasket material must be extended to the inside edge of the mating face as shown on the bottom-left of the photo below. Failure to do so will result in a leak in your Intake Manifold Assembly.

(Note: Engine rags/paper towels removed from engine ports prior to installing Plenum Top Plate)

Obtain the Eaton M90 Supercharger Assembly (already assembled in a previous step). Place the assembly onto the Plenum Base Plate and bolt it down with the provided M6x30mm flange bolts. Caution: Do not drop anything into the 1 5/8” hose on the Plenum Top Plate. Debris may fall into your Engine Inlet Ports. Place a small rag or paper towel into the hose to make sure nothing falls in (make sure the rag does not fall in).

Install the stock IAC Valve on to the ModdBox Intake Manifold using the M6x12mm socket head cap screws.

Proceed with the ModdBox Intake Manifold installation by adjusting the illustrated hoses as described below.

Clear the future Throttle Cable and Cruise Control Cable location of any loose hose, ignition cables, electrical wires, fittings, etc. Be sure to fasten these components securely and away from the action of the throttle body. Caution: Failure to keep this area clear could result in your throttle sticking open! Be sure this area is kept clear and that all components in the engine bay are kept secure.

Note the orientation of the Hose Connector fitting in relationship to the ModdBox Intake Manifold.

Take the ModdBox Intake Manifold Assembly and connect the Hose Connector (already connected to two 1/4? hoses and one 5/8” hose) using the M5x10mm socket head cap screws.

Locate the Stock Throttle Cable and Cruise Control Cable (if equipped). Connect the cables to the ModdBox Cable Mount as illustrated. Snap-in the Throttle Cable to the slot on the passenger side. The Cruise Control Cable must be snapped into the driver side slot.

(Note: Contrary to the photo, it’s easier to bolt on the Throttle Body after the assembly is bolted to the supercharger)

Locate your Throttle Position Sensor Plug and Idle Air Control Valve Plug.

Carefully expose the wires from the plastic guard and electrical tape.

Take the Idle Air Control Valve Plug Wire and cut it approximately 3” from the plug end. Splice in approximately 3’ of wire to extend the wire to the new IAC location and plug it in. Use the provided tie-downs to secure the wire away from any moving parts. Caution: Make sure you do not reverse the polarity of the wires.

Apply the supplied Liquid Gasket to the ModdBox Intake Manifold as illustrated.

Line up the 1 5/8” Supercharger Bypass Hose and press the assembly down. Secure the 2” Hose Clamp to the Supercharger Bypass Valve. Caution: Do not drop anything into the Supercharger Bypass opening in the Plenum Top Plate. It may fall into an engine inlet port which could cause damage to your engine. Remove any rag or paper towel that you may have placed in the tube.

(Note: It may be easiest to have the tube connected to the Plenum Top Plate as suggested earlier)

Bolt down the ModdBox Intake Manifold Assembly to the back of the supercharger using the provided M8x25mm socket head caps screws.

Bolt the Stock Throttle Body onto the the Intake Manifold as shown using the provided M6x16mm socket head caps screws.

Locate the TPS plug wire and cut it approximately 3” from the plug end. Splice in approximately 3’ of wire to extend the wire to the new IAC location and plug it in. Use the provided 1/4" loom and tie-downs to secure the wire away from any moving parts. Caution: Make sure you do not reverse the polarity of the wires.

Place a thin bead of Black Liquid Gasket on the ModdBox Intake Manifold’s mating face as illustrated.

Place and bolt up the ModdBox Intake Manifold Cover with the provided M6x12mm socket head cap screws.

Locate and connect the Brake Booster Hose to the provided 3/8” barb located on the back driver side of the ModdBox Intake Manifold.

Locate the Fuel Injection Vac Line and connect it to the 3/8” barb located beside the Supercharger Bypass Valve.

Locate the Fuel Vapor Return Line. Cut off the press fit connection and reconnect it to the remaining 3/8” barb on the ModdBox Intake Manifold. Secure the hoses with the provided hose clamps.

Locate the Stock EGR Valve. Connect the valve to the provided Stainless Steel EGR Extension.

Use the provided M8x25mm bolts and secure the EGR Valve to the ModdBox Intake Manifold as illustrated.

Reconnect the EGR Vac Line.

Use the provided 5/8” hose (16” long) and connect one end to the Crank Case Ventilation Tube. The Stock Crank Case Ventilation Tube can be removed by pressing the plastic spring release on the end of the fitting.

Connect the other end of the Crank Case Vent Hose to the Stock Intake Tube. Secure both ends with a hose clamp.

Remove your vehicle’s Stock Airbox Assembly (see stock diagrams for more details). Use a saw to cut the Stock MAF Tube approximately 1” in front of the MAF mount. Re-connect the MAF tube to the Stock Intake Tube. Plug the MAF back into the electrical socket. See illustration below.

(Note: Some models will be equipped with a flange between the airbox and the MAF)

Connect the downstream side of the Stock Intake Tube to the Throttle Body. Secure both hose clamps.

Bolt the ModdBox Intake Heat Shield to the bolt located behind the passenger side headlight assembly. Secure the Intake Shield to the radiator coolant hose with the provided strap. Place your 70mm ModdBox Cold Air Intake Filter to the Stock MAF Tube and secure the hose clamp.

Replace the Stock Fuel Pump with the Moddbox 255lph Fuel Pump. See description here:
Install Instructions 4.0L V6 Cologne @ ModdBox

Re-install Radiator Rock Shield. Replace the 3/4 gallon (~3L) of coolant back to into the radiator cap.

Slack your Belt Tensioner using a 3/8” Box Wrench or Belt Removal Tool. Remove the Stock belt and replace it with the ModdBox 6PK Belt as illustrated below.

Optional. Obtain your stock throttle body cover. Cut the cover as shown in the below diagram. Remove one M6 bolt from your ModdBox Intake Manifold Cover and bolt down the throttle body cover.


EGR Vac Line
EGR Electrical Plug
EGR Stainless Line
Crank Case Vent Hose (may be 2 depending on your model)
IAC Electrical Plug
TPS Electrical Plug
Electrical wires (from side of Intake Manifold) should be secured away from the Throttle Cable and Cruise Control cables.
Fuel Vapor Return Line
Fuel Injection Vacuum Line
Brake Booster Line

more edits to come... for the most up-to-date information... click here:
Install Instructions 4.0L V6 Cologne @ ModdBox
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Old 05-16-2014, 11:31 PM
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moddbox moddbox is offline
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update: fixed video link from blog

Here is an 8psi dyno. We actually have a bunch more mods coming soon that can make much more hp

*ps. Thats +8hp & +23hp over the Mustang GT
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