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Originally Posted by ahains
Cosmo,
Thank you for sharing this information. I was intending to swap in a ball & spring MBC (and boost gauge) off of my Talon to regulate to a conservative ~13psi, with a goal of increasing 1st and 2nd gear boost.
I would greatly appreciate it if you could provide any hard numbers of what you have observed, correlating the a/f ratio with the boost & throttle position. Doesn't have to be precise, just ball park numbers that you recall. If it is somewhere south of 12.0 a/f under all TPS values for 13psi, I may still be satisfied since I will be installing my water injection system as well for some additional safety. This is assuming that WRX's do not run super aggressive timing, which I will need to research first (just started researching yesterday).
I know that replacing the first cat is highly recommended for increasing boost / power, but I would much prefer to keep my exhaust system stock at the expense of less power. I'm at a stage in life of caring more about the exhaust I'm shooting at the person behind me in traffic 
Thanks much!
-Adrian |
Now that I am a bit older and wiser on WRX's, I thought I'd reply back to myself.
The fact is that on 04 and 05 WRX's, the stock programming will target 14.7/1 AFR even at full boost. This is horrible horrible horrible. Not only would I NEVER but a boost controller on a stock 04 or 05, I wouldn't put up with leaving the factory programming in place.
If you know anyone in your area with an OpenPort cable from tactrix.com in your area, they can use free software to flash your stock ECU with some changes to the open loop/close loop delay and protect you from this horrible stock programming.
Once you do this, it is not nearly as risk to up the boost slightly with a boost controller. Although it is better just to use the same cable to edit your boost targets in the stock ECU to raise the pressure. Since there is not yet a published tool to do this it means busting out your hex editor, but it is not hard if you are a geek
-Adrian