Project EVO MR – Engine Bolt Ons Part 2

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Upon completion of the parts’ installation, Danny performed a boost leak smoke test to ensure all connections were tight and all the hose clamps properly in place.  The next day would be the ECU tune on Cobb SoCal’s dual roller Mustang dynamometer.

 

We strapped our EVO to the dyno rollers and were ready to go.  Cobb’s dyno cell is very impressive with ample air flow provided by huge fans.

Prior to doing the ProTune, Cobb’s tuner  Mitch McKee told me about the stock fuel pump voltage switching relay going bad in the Evo Xs.  The fuel pump relay will switch between 9V and 12V supply to the fuel pump when WOT.  Some of the relays in older cars are failing (contacts stuck or completely broken) and causing the car to run leaner.  It’s a good thing Mitch checked my fuel pump relay because when we shook it, it was evident that something was loose inside.  We replaced it with a new factory relay (blue color).  For those readers that are tuned, or about to be tuned with modifications, be sure to check the relay!

 

With the fuel pump relay check completed, the tuning process would be placed into the hands of Cobb ProTuners Mitch McKee and Jon Hebbeln. Mitch has done excellent work on our Subaru Projects and we were eager to see what he could make our EVO X do.

 

 
NOTE: Due to time constraints prior to bringing in the car, I was unable to do a baseline dyno measurement in stock form on Cobb’s Mustang Dyno.  I did, however do a baseline measurement on GMG’s Mustang dyno back in Feb 2010 after I had the car a few months. Granted they are different facilities, on different days, and not scientifically comparable, on the GMG dyno the MR pulled: 214 hp / 241 ft-lbs:

 

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