2002WRX, was running 14psi boost according to the stock guage almost 1 bar. I installed a 3/16'' coupling between the wastegate and solenoid to improve boost response and was also now able to hit 14psi in second. Next I removed the intake silencer and used large diameter hose to reconnect the airbox into the wheelwell. I also removed the hoodscoop/intercooler cover from under the hood, at this point still hitting 14psi. Finally I reset the ECM following these steps. Disconnected neg. battery lead, let sit overnight and reconnected battery lead, started car did not touch throttle, car reached operating temperature and shut car off, restarted car and took for a drive, took 1st and 2nd gear to red-line a few times and parked at work. Now I hit 8-9psi best in any gear. Did I do something attempting this reset? Car runs great other than the loss of boost, all vacume lines and connections seem fine, no leaks. Blow off valve seems o.k. its a TurboXS, never had any problems with it with one washer in it. Their are no other mods done to this car other than Apexi timer and Autometer gauages. Please any help, I want my boost back.

 

I would imagine you need to give the ECU more time to adjust itself for optimal operation.

 

Any idea how long it will take to reprogram? It has been about 1 week and 2 tanks of fuel. I didn't think reseting it would effect the peak boost.

 

From the discussions I've seen, it looks like two tank's worth is the usual time it takes to get itself tuned. Dunno beyond that, sorry.

 

Yes, I have read the info. for accelerating the factory ECU ignition timing process. After a ECU reset it said it could take a few hours or afew weeks, this makes it happen in 5 seconds. Had considered trying this but was waiting for feedback and wanted to make sure I gave it enough time to see if my boost would return beforehand. Every one seems to agree that the lost boost is from the ECU reset, if it does not eventually reproram itself for 14psi, should i take it to the dealership?

 

Go and do the reset like you have read. It will not hurt anything and will make a difference right away. Something you might want to consider is eliminating the 3/16th mod. I bought my car brand new and did the 3/16th mod. I had no boost gauge so I could not see any change. Went to a Subaru all wheel drive dyno day and with a turbo back exhaust I was only making 144 at the wheels. Had a friend hook up his computer to my car and it was only running 8 psi, which is basically wastegate. Tried several different things that day and no change. I brought the car into subaru for them to check out the problem. They told me to replace the factory exhaust and then bring it back. I got the stock fitting from a friend to return the 3/16th mod back to factory. By this time I had installed a boost gauge. I replaced the 3/16th piece with the original and reset the ecu. I took the car for a test drive and I was producing 14 psi again. Prior to returning to factory i was only able to run mid 15's at the dragstrip, after eliminating the 3/16th mod I am able to run mid 14's. All this with the only change being the return to roiginal on the 3/16th mod.

 

Thanks for the info., I figure I will replace the original connector first, test it, and then do the quick learning process. You had to replace the stock exhaust before the dealer would work on the car or was it for warrenty coverage? I've only had my car to the track once and it was stock not even these simple mods plus it was my first time so my reaction times were really bad but I still was able to do 14.70 and could tell the car would do better with a skilled driver. The car does feel quicker up until I hit the 8-9psi.