Im trying to figure out why I'm running rich as i approach full boost as well as all the way through boost. I drops down to mid 9's now. Im looking at my old dyno chart and according to this my a/f barely dropped below 11 and that sounds about right from what i remember. I did pretty much re-design the entire setup but kept most of the essential components the same. I did change from a tial f38 38mm waste gate to a tial mvs 38mm. could that affect my afr's? also had to get new 440cc injectors, this time I got 2005 wrx injectors instead of 2002 wrx on accident. but come to find that they are actually high impeedance injectors so they work. is it possible theres something different with these injectors that im not aware of thats causing me to run rich? another possibility is that this much better design manifold lets the turbo spool up quicker and more efficiently than the crappy road race disign. but i would think that would cause it to run lean not rich as more air would be going into the engine.

another issue that im dealing with that kinda ties into the running rich issue is that my boost gauge is reading a steady 14psi. to me this is really weird because Im only running an 11.6psi spring setup in my wastegate. but it stays constant and i can hear my wastegate open so I know Im running on wategate boost. I just replace my boost gauge with an autometer as well and it seems accurate. so why if I was tuned on 11.6 psi with an afr of 10.8 at the lowest, am I now running on 14psi with an afr that drops down to 9.5. even though I have only the 11.6psi springs and no boost controller. How am I running more boost but still getting more fuel with no additional tuning? Im confused...

 

also i have been told by someone befor that its not good to T your bov or boost gauge vacuum line into to the fpr vacuum line. is this true? and could this maybe be causing some fuel issues?

 

Tuning can be mysterious at best sometimes. If you have used a couple boost gauges and they both show 14 psi I would be inclined to believe its reading correctly. As far as the fuel goes did you check to see if the new injectors were modded? You can uncap the injectors and turn them into 880cc. This would easily cause this rich condition. I run 11.5-11.7 at peak boost/torque then I richen up from there as I approach redline. As far as the Tee in the fpr line goes I have had my blow off valve and my boost gauge both tee'd into my fpr line from day one of my build with no issue from it.

 

I would look more into the issue of the 14psi. is the vacuum line still installed properly to the wastegate? No leaks in that vacuum line or anything restricting the airflow? If you're running a different amount of boost than you're tuned for, that could easily change your AFR's. You could also be experiencing knock from it and the ECU could be using the low octane fuel map and dump more fuel to try and fix the problem.

 

no mods on the injectors. the guy i got them from ran em in his brand new wrx until he took em out at 15k and put upgraded injectors in. they look stock to me as well.

trust me ive been looking into it from day one, the only think is that I had such a crappy boost gauge before when my car was turbo'd so i never got to see my actuall boost. so I could have actually been boosting closer to 14 before and not known it. my wastegate vac line is perfect. no kinks and nothing restricting it. in fact its only about 5 inches long anyway. lol but could the diaphram in the wastegate maybe be messing up? the other day for the first time i noticed something new as well. i had it at WOT and my wastegate was open, its really quiet because i have it recirculated but i still heard the wastegate close and then re-open a couple times while still under WOT. what could cause the wastegate to flutter like that? it is a brand new wastegate but i did get it from some guy on ebay so you never know. when I was replacing the wastegate springs i noticed a small knic in the diaphram. barely anything butmaybe that could do it? but even if it was the issue, none of this would cause me to boost higher than the 11.6psi wastegate spring.. if anythig a messed up diaphram or vac line would cause me to boost less. not more. if i had a boost controller that was messing up then i could understand it boosting more. but im running no boost controller.

 

If your vacuum line came off the wastegate, it would cause you to over boost. That's how a boost controller works, it restricts the airflow to the wastegate creating more boost. You can't boost less than amount the spring is rated for unless you have a boost leak and can't hold boost. But like you said. If you only noticed the change in boost when you got a new gauge, maybe the old gauge was bad. Just weird that you're having a change in afr values as well

 

Is there a way you can test your new wastegate by reinstalling the old one on and see if your values change?

 

Test your wg by connecting it to an air compressor and slowly raise the pressure to see when it begins to open to see if it is opening at the correct time.