1999 Forester S Turbo 5MT
I had a session with top UK tuner Bob Rawle a couple of weeks ago and a few things came up that I felt I should post. This is more for amateurs like myself who don't know enough about tuning and might be in need of a laymans experience. I have a 99 UK S Turbo with a TD04 fitted. I also replaced the fuel pump for a Walbro along with Samco hoses and, this is the important one, an aftermarket EBC. The new EBC brings the boost on mighty fast but when the mapper tried to match the EBC to the ECU, the results were less than he felt were satisfactory. If mapping is an option in the future consider not getting a stand alone EBC and put the money towards the map. Also, using an outboard BCS means that the ECU can't step in if there is trouble, so you lose your safety as well. I was under the impression that the factory unit, which is programmed to 0.55 Bar but using outboard methods, can be pushed to 0.8 Bar before the ECU cuts the fuel, would not be able to go farther than 0.8 Bar. It turns out I was incorrect. The stock unit will go to the 1.3 Bar that Bob has programmed the ECU to take along with the stand alone EBC. I will be going back in 4 weeks for a second session and the factory boost controller will be re-plumbed on the day as it takes only minutes to do. I also had a misfire which seems to be reported by a few Subie owners at re-map or dyno time, even if they weren't aware of this before. Suffice to say, Bob dragged a lot more grunt out of my Foz but it's somewhat crude in it's delivery at the moment with the EBC I am using. The second session is going to cost and I might have saved that money had I been aware of the EBC issues and changed my plugs beforehand. I will post again after the next session.