What is the hp potential? Is a tune required?

The hp potentials for an engine with stock internals are listed below (based on dynos performed at 400m elevation and tunes).  Note that all drive-by-wire (electronic throttle models) require tuning at all boost levels.

~Est.Crank HP RWHP Torque Boost* Boost Pulley Included? Tuning Required?
207 hp 165 hp 185 lbft Stock Not Applicable for Stock Not Applicable for Stock
262 hp 209 hp 230 lbft ~3.0 psi Pulley Included in Kit Tune Required (not required for non-electronic throttle models)
269 hp 215 hp 236 lbft ~3.5 psi Pulley Included in Kit Tune Required (not required for non-electronic throttle models)
294 hp 235 hp 258 lbft ~5.5 psi Sold Separately Tune Required, Injector MAF, & Cooling Upgrade Recommended
315 hp 250 hp 278 lbft ~7.5 psi Sold Separately Injector MAF & Tune Required, Cooling Upgrade Recommended
331 hp 262 hp 293 lbft ~9.5 psi Sold Separately Injector MAF & Tune Required, Cooling Upgrade Recommended

*Boost numbers are temporary maximum boost levels you will experience with the rectangular style blower (94/95).  The oval style blower (89-93) will produce slightly lower boost levels in the top end.

What supercharger do I need?

Okay, check out the supercharger installation PRODUCT listing. You will see a list of vehicles that have these superchargers equipped. When shopping around for a supercharger, use these vehicles to search for compatibility. We also have an INFORMATION listing for both types of superchargers that are compatible to our kit, namely the 1994/95 Eaton FORD M90 (rectangular-style) and the 1989-1993 FORD Eaton M90 (oval-style). Use these links to find out more information on these superchargers. We do not sell these.
The superchargers will look like this when they are still installed on the original Ford Thunderbird or Mercury Supercoupes (very useful if you are sourcing one at a yard or something). You can see it has large aluminum cast (heavy) pipes that go to an external air-to-air intercooler in the front radiator. Often times these pipes or pieces are included with online supercharger listings making them look different. Requesting a seller to remove these unneeded pieces will save you lots of $$ on shipping. Note also, that the STOCK installation (on the Ford Thunderbird and Merc Supercoupes) has a supercharger orientation that is 180 degrees rotated (up-side-down) when compared to the Moddbox installation orientation.  This makes the supercharger look different than our Moddbox photos and often confuses people.  See below:

This is all you need (19890-93 oval-style supercharger shown):
(pictured upsidedown from Moddbox installation orientation)
This is all you need except the stock pulley. You will need to remove the pulley during the Moddbox Installation if you purchase on with a stock pulley installed (19890-93 oval-style supercharger shown):
(pictured right-side-up from Moddbox installation position)
Here are photos of the TWO types of Eaton M90 units that are compatible. The Cardone part numbers are shown (different) and may help you in your search:
As mentioned above, there are actually TWO types that match our kit… either the 1994/1995 (rectangular inlet) or the 1989-1993 (oval inlet).  These look almost identical except for the inlet ports at the back (and the inlets are positioned slightly differently).  See pictures below:
(Note: The photo only shows the rear rotor pack cases of the rotor pack assembly which are part of the supercharger unit.  Photo shows the 1989-1993 case (left) and the 1994/1995 case (right) and clearly shows how the TWO types of compatible superchargers differ.  The photo does not show the internal rotor assembly or the snout assembly (shaft, case, and pulley assembly that goes on the front).  NOTE: snouts are interchangeable, meaning you can swap them between the two types because they are the same. Usually, the snout fails much quicker than the rotor pack due to the axial load on the snout bearing, so if you find a nice unit with a bad snout, no biggy. The snouts are VERY easy to rebuild yourself and bearings are cheap. We do not recommend trying to do the rotor pack rebuild yourself. Also, there are lots of rebuilders around if you find a core somewhere.

Can I see some Dyno sheets?

Here is a Dyno sheet from a basic 3.5psi setup (3.4″ pulley equipped).  The vehicle tested was a stock 2005 Ranger 4×4 XLT equipped with only a 2.5″ Magniflow Cat-Back exhaust kit and the parts provided in the Moddbox Supercharger Installation kit using a 1994 Thunderbird supercharger.  No tune or other modifications.  Note:  Red line is a stock 4.0L SOHC with a K&N cold-air intake kit installed.


Here is a Dyno sheet from a 8.0psi setup (2.9″ pulley equipped).  The vehicle tested was a stock 2005 Mustang equipped with a 2.5″ Magniflow Cat-Back exhaust kit and the parts provided in the Moddbox Supercharger Installation kit using a 1994 Thunderbird supercharger.  The vehicle was tuned by Lasota Racing remotely as per our Tuning Manual using and SCT X4 and PLX AFR gauge.

What is the fuel mileage like after supercharging?

For stock drive-by-cable models (Ranger, Sport-Trac, Explorer) running the stock tune with only the Moddbox supercharger kit at a 3-3.5psi boost level, a fuel mileage change of +(0-1)mpg City and -(1-3)mpg Highway. In general, fuel mileage is better but you are required to run minimum 91 octane fuel. On custom-tuned vehicles with boost levels 5psi and higher, the mpg can vary considerably based on the particular tune you are running. In addition, if you change your driving habits fuel mileage may suffer.

Can I purchase your supercharger kit without the supercharger?

Yes.  In fact, we only sell the rebuilt superchargers separately now.  Since the quality of rebuilt superchargers can vary in aesthetic quality, we want to differentiate the amazing quality of CNC manufactured parts when compared to the casted parts of our big name competitors.

For the 3.5psi pulley, no need for a tune until you upgrade to a higher boost?
– Chuck

You are correct.  However, this is only applicable to all Rangers and the Explorer/STs with non-electronic throttles.  The stock ecu on the Ford Ranger/B4000/Explorer/Sport Trac will supply enough fuel for this boost level provided that that ~4 bar (or 55psi) is present at the fuel rail under load.  Although you can safely tune these vehicles with the stock fuel pump (even up to the higher boost levels), we have included a free high-flow fuel pump to ensure that a static >55psi is maintained without a tune.

If I was to purchase my own m90, will your kit be compatible to the oval and the rectangular m90? 
– Richard

That’s right.  This kit is designed for ALL Thunderbird Eaton M90s between the 1989-1995.  You may also be interested to know that the 94/95 blower is a bit more efficient than the 89-93 in the top end.  In rpms below 3000, the blowers are very similar in their efficiency.  Porting and coating rotors can also change or improve the efficiency in the top or bottom end.

Why does Moddbox recommend cooling when using the 3.5 psi pulley?  I know you offer methanol/water injection kits, but do you offer an intercooler kit as well?
– Tom

As for our recommendation for cooling, it may be possible that under extreme driving conditions (long extended heavy towing, hill climbs, racing, hot/dry/low elevations, etc), higher EGT (exhaust gas temperatures) may be experienced with an un-tuned vehicle running the 3.5psi pulley.  Although the temperatures are very similar to the stock naturally aspirated setup, the addition of cooling equipment is recommended to mitigate these risks.  We no longer offer the intercooler kit, since the water/methanol injection is much more popular, is more cost-effective, and has a lower overall cost.  It is also more efficient at cooling and provides additional fuel directly proportional to boost which adds further protection to knock.

I have a 2003 model and my vehicle does not have an exhaust gas re-circulation (EGR) system.  Is the kit compatible?
– Joey

Yes.  For vehicles that are not equipped with EGR, our kit comes with an EGR block plate.   To our knowledge, only the US built 2003 Ford Ranger does not come with it standard equipped.  If you order a 2002-2003 Ranger kit, we automatically include parts for both setups.

My truck has A/C.  Will the belt included in the kit fit my vehicle?
– Joey

Yes the belt will fit.  Almost all the 4.0L models are equipped with air conditioning.  If your model did not have air conditioning equipped or if it was removed, the belt would be too long.

I have a 4.0 SOHC but my vehicle model & year are not advertised.  Is your kit compatible to other 4.0L SOHC engines?
– Wilfred

Yes. Our kit is compatible to other vehicles that are not advertised, however, we do not guarantee 100% bolt-on compatibility. Some vehicles that ARE 100% compatible include pre-2002 Ford Explorers, Ford Explorer Sport Tracs, and the Austrailian Ford Courier.  In addition to these models, the Land Rover LR3 and other 4.0L SOHC models may be compatible with minor modifications (typically vacuum lines and electrical connections).

Here are a few photos detailing the various 4.0L SOHC models and notes regarding their compatibility:

The following engine photo is 100% Bolt-on compatible to one of our kits.  This setup can be found on Rangers, 2-door Explorers (some 4-door Explorers in the USA), and pre-2006 Ford Explorer Sport Tracs.


The following engine photo is 100% Bolt-on compatible to one of our kits.  This setup can be found all 2002+ 4-door Explorers, and 2007+ Ford Explorer Sport Tracs (minor variations including drive by wire or electronic throttle).


This setup can be found on 2005-2010 4.0L Ford Mustangs.  This engine arrangement is 100% compatible.


Any engine that looks like the following photo is compatible.  We have confirmed that our kit is compatible and several of our customers have already installed our product successfully.  You will require a throttle body off a Ford Ranger (4.0L 2002-2011).  We do not advertise this compatibility, however, we have all the parts instock and we can set them up for you.  This setup can be found on various Gen II Explorer models between 1997-2003.


This is the 4.0L V6 Ford Courier.  Although we have had several customers purchase and install these without incident, we do not advertise or provide installation details since we have not had access to one.


Finally, there is the Land Rover LR3.  We have confirmed that our kit is compatible with this vehicle, however, our kit has yet to be installed on one of these models.


If your engine bay looks like the following photo, you have the 4.0L OHV.   This engine is not compatible and we do not currently offer products for this engine.  This setup can be found on various Explorer and Ranger models pre-2003.