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Removing the Stock Cobra Eaton Supercharger
Having your Eaton supercharger ported by Bob Stiegemeier obviously means you have to get it to his shop. Unless you plan to drive to Missouri you're going to have to remove and ship the supercharger. Stiegemeier can turn the unit around in three days or less so your car wont be down long. Once you learn how to remove the blower installation is a snap. It only takes a few hours, here's how you do it.

You'll need a set of standard and deep well metric socket set and varying extensions. You'll also need a T20 Torx bit to get the Mass Air Sensor out. Finally, summon a friend since the blower itself is a pretty heavy unit that has to be lifted while hoses are unclamped from underneath.


If you still have the stock pulley cage, unbolt it via the 3 8mm bolts. Next remove the supercharger belt. Use a 1/2 inch wratchet or pry bar. To get the belt off easier, slide it off of an idler versus a pulley.

Disconnect the throttle cable and cruise control cable from butterfly. Next remove the two bolts from the throttle cable bracket connected to the supercharger. Pull this out of the way.


Unplug the IAC and TPS sensors. These are the two black sensors that are on the plenum right behind the throttle body. Disconnect the MAT sensor on the drivers side of the supercharger, which is below the EGR.


Disconnect the black air duct from the mass-air meter and air box. Then remove the four 13mm nuts holding the plenum and throttle body to the supercharger and carefully slide it off as a unit. Save the gasket for reuse if it's in good shape. The plenum and throttle body will also be shipped to Stiegemeier.

Unscrew the black bracket on the driver side that holds several sensors. There are two bolts on the side of the supercharger and one nut on the back of the EGR that holds this on. Unplug the sensors and vacuum lines necessary to pull it clear. Make sure to note which wires you have disconnected and where they go.

Disconnect the EGR tube from the EGR assembly. There will be a large nut holding the EGR tube to the EGR assembly. Then remove the EGR from from the supercharger. There is one bolt and one stud. Take it off carefully and save the gasket, because you will re-use it.


Remove the vacuum lines from the back of the supercharger, there are a total of 3 and one vacuum line that goes to the drivers side valve cover that needs to be disconnected.


Unbolt the two 10mm fuel rail bolts on each side of the supercharger. The fuel rail and injectors can be removed now or after the blower is off the motor.

Remove the ten 10mm intake manifold to cylinder-head bolts. These are the bottom bolts. The upper ten bolts hold the lower intake to the supercharger and can be loosened at this time, but do not remove.

Remove the two black intercooler hoses from the front fittings. There is a hose clamp on each one, and after you slide the clamp back, spin the hose back and foreth while pulling. A little intercooler fluid will spill out.

Now lift the supercharger and intake manifold up and out of the engine bay. This takes two people. Make sure to put towels in the 8 intake holes to prevent tools or grime from falling in.

We removed the injectors and rails, but if you are careful it is not necessary. Remove the MAT sensor and boost bypass valve. We rounded off a bolt on the EGR so it was removed in this step, but it is easier to remove it when the blower is still on the engine. Save these items for when the blower is reinstalled.

With the supercharger out of the car, unbolt the four bolts holding the intercooler cap in place. Pull it off carefully.

Note the silicone RTV sealant on the intercooler cap. Clean this up and reapply a bead of silicone when it comes time to reinstall the ported blower.


Now remove the 10 intake bolts and separate the supercharger from the intake manifold. Save the supercharger to manifold gasket, it will be reused as well. If yours looks comprimised obtain a new one from Ford.


Flip the blower over and remove the intercooler. Carefully unbolt all 10 bolts that hold it to the bottom of the supercharger.

The next time we see this supercharger this outlet area will look completely different.

Pack the blower, throttle body and plenum up securely and ship it off to Stiegemeier Engine Airflow. Then find another way to get to work for the next couple days.
 
(Blower intallation and dyno testing)
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Here is a 3.10 and 2.93 pulley side by side. The difference in boost is 1.5lbs.


Upper Pulley Belt Guide
3.65
(Stock)
Goodyear Gatorback Belt
4080750 - 75"
3.4Goodyear Gatorback Belt
4080750 - 75"
3.2Goodyear Gatorback Belt
4080745 - 74.5"
2.93Goodyear Gatorback Belt
4080740 - 74"
2.8Goodyear Gatorback Belt
4080735 - 73.5"

















 

 

 


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