so last weekend i was tuning my car and it was doing fine. this weekend i keep getting a wierd load increase at about 5000 rpm. Trying to figure out what it could be, my first thought was maf but i swapped it out with a known good one and same thing happened so i know its not that. Could this be a boost leak, or maybe my cat plugging up? I have an 03 stock turbo, 3in dp, 3in catback with stock cat, cop, 880cc injectors, NGK iridium 7 gaped @ .24, areomotive 340 fuel pump, aem cone filter, and im tuning with tephra v7, evo scan and AEM wb o2. I also thought maybe it was just the stock boost controller so i put a manual on it and it does the same thing. the first log is last wekend while it ws running good and the other one was the same tune this weekend. Im stumpped please help if you can. Thanks

 

well youre knocking quite a bit

 

thats the problem. I wasnt last weekend and now i am. nothing between these logs change except the gas and about 300 miles of normal driving. I tried 3 different stations to see if it was that and its not.

 

load = higher airflow. somehow you are now overboosting, possibly from the colder weather. you said you swapped out to a MBC, but did you lower boost?

 

Those 2 logs are both on the stock ecu controlled boost. And yes I turned the boost down with the mbc but it still does the same thing. It doesn't spike as hard as it used to and it's almost like boost creep at 5000 till 6000 then it levels out like it should. As far as the weather there hasn't been much difference here. And it's never affected the car like this.

 

Ok I figured it out. I had a couple small boost leaks and one major boost leak on my bov hose. Fixed those and put my timing map back where it belongs and it runs 24psi no problem. Thanks for the help.