forcefedh22

I have a h22 with a garrett t3/t4 turbo, fmu ,stock injectors, 255lph pump, vafc, and a missing link. When I mash the throttle down it has good power untill the wastegate opens, Then it flutters and looses power. If I just give it 40% throttle and let it build 5psi instead of six (when the wastegate opens) it has great power. I know this might sound like a stupid question but I'm stumped.

PureTeg420

are you using anything to retard the timing for every lb of boost? It's probably unrelated to your problem, but if your not, your motor will be dead soon. Also, you're using an FMU and stock injectors, you should really be using an inline pump because I'm sure your fuel pressure is high. In fact it might be high enough that your walbro pump cannot keep up, and once you reach full boost your motor is running extra lean

forcefedh22

nope, I have an msd 6al I should probably get a boost timing master.

forcefedh22

oh, ok that might be why its flutters and looses power. thanks alot .

PureTeg420

no problem. It definatly sounds fuel related to me. You should look into borrowing a buddy's wideband o2, or hopping onto a dyno w/ a wb02 before you start throwing money at the problem. Nothing more frustrating then buying new parts and still having the same problem