just thought I would post this, Ive spoken with the guys over at
www.ATP.com who have a turbo upgrade kit for the MSP6. They have a boost cut killer that you can buy that will prevent the ecu from killing the boost, I wonder if this could solve the boost cut condition that has been robbing you guys of your power. They have a video of their test car ripping off a sub 13 second 1/4 mile for those interested. I emailed them about what they used to tune, and if a boost controller and a their BCK (boost cut killer) would allow the boost to be raised and a safe a/f ratio maintained. They said that the factory fuel system has more than enough to run with what the stock turbo can put out and that a boost controller and their BCK would allow the boost to be turned up on the stock turbo.
On a second note, I believe the problem with the boost being cut is the top mount intercooler. I have yet to see a top mount intercooler that doesn't run into problems with detonation. Look at the top mount on Subaru's, even in stock trim on a hot day the ECU pulls out timing and cuts boost because the intercooler gets heat soaked and the intake temps skyrocket. Turbo magazine did a test on the stock intercooler (they did a whole build up of the STI) and found it to be completely heat soaked after just 2 runs on the dyno. This is with the STI's huge bird-swallowing hood scoop as well. All the MSP6 has is the two small inlets at the front of the hood. So, Im willing to bet that a water injection kit would alleviate the problem if you dont want to pony up the big bucks for a custom front mount job. At the very least plumb a windshield washer hose over to the intercooler and put a nozzle on it. This is another trick Subaru's use to keep the intercooler from getting heat soaked. This wouldn't void any warranty, and would cost like 15$ from any autoparts store. My 2 cents have turned into a rant, thanks for reading lol.
