so know i get a new tdo4l, but im getting a problem, it is only in 2nd gear and up, when i reach like 4000 rpm it start like desaccelerating but not constant , it like for instants , in 1st gear it works fine. can someone help me, im pushing 7 psi. sorry about my english im form guatemala

 

Probably a bad case of detonation caused by switching the turbo without tuning after. What AFRs are you seeing? What are you using for tuning?

 

mmm, im just runnig a fmu, with a walbro, a boost controller. what could i do?,

 

I'm guessing you just installed everything and drove away. You need something to tune with. You need a piggyback fuel controller or ECU reflashing software. You might damage your engine if you don't tune your engine for fuel and ignition timing. You may also need larger fuel injectors if your stock injectors are at maximum IDC.

 

^+1 thats what i think he did cause if i remember he also tried to drive with out a bov for a while so i dont think hes done to much research.

 

ok, yes im learning all this stuff, the are no much people in here that know very much about lancer, so it is kind of hard. about the bov it is ok know. the thing is that with the first turbo it work fine. could it be other reason before the tune?, i can figure that my air filter is already in bad shape, or maybe be the fuel pump?, im running stock inyectors.

 

You need to tune your car. You need the right gauges to know how your engine is running. What are your air/fuel ratios from 2500rpm - 6000rpm? What is your fuel pressure at? How much ignition timing are you running? You need to answer these questions for yourself to know why your engine is running bad.

 

Sounds like you are running out of fuel. What kind of intercooler do you have?

 

ok, know are running well, no more trouble, just change the air filter and no more trouble it run good, it seems the old one was in very bad shape. thanks to the people that help. the mechanic check the fuel ratios and it all right know. thanks a lot.