Sounds like you should have a professional look at it at this point it would probably be the best for everything if you have the money.

 

Any clue?

 

Guys,
after i added another 7psi spring into my turbosmart w/g (total 14.5+7 = 21psi) the sound like boost cut / misfiring problem still occur...And im facing a more worst over boost issue...

I still not re-gap my new plugs and will it be :
1) Boost Solenoid problem?
2) Air flow sensor?

 

get a tune, bigger injectors, fuel pump, etc etc. its not as simple as just turning up the boost

 

Ive tried remapping, running on walbro 255 fp, fpr, w/gate, etc...
Will put in 800cc sard injectors soon...

 

What turbo is the OP running?

 

Hi Sparky, im still running on stock oem Evo 5 turbo.

Should i remove back the added 7 psi spring?

When i slowly allow the boost to build up i dont hv this misfiring or boost cut problem but whenever i full throttle it the problem come...

 

I am just trying to visualize a more complete picture of your turbo and wastegate setup. So, do you have the stock V turbo and a remote WG? Am I way wrong?

 

Hi Sparky,
here a picture of my set-up...

As my Mech have tested the w/gate after added the new 7psi spring and the w/g valve will only start opening on 1.6 bar...

 

I have a evo 4 and I had he same problem untill I upgraded the fuel pump to a walbro 255, and a good tune.