sputters as soon as wastegate opens

[rocket_dog]

At WOT the motors start sputtering as soon as the waste gate opens,other than that the car runs fine. It used to run fine with stock injectors, Access ECU, stock MAF and 9psi.The mods i have,550 cc injectors (Venom of Ebay any takes on this anybody???)Top mount cast iron manifold38 mm Tial wastegate @1 bar boost (open)TO4E turbo 63 hotside 50 cold300 zx MAFReprogrammed ECUWalbro fuel pump and I did change the fuelfilter.

Please Help

[AB-R40]

check your injectors if they are plugged in or check your maf wiring.

[the converted]

Check for boost leaks and what is your timing set at? Do you know what your a/f is when it is sputtering?

[240life]

I would also recomend running your spark plug gap at 22, and using a 7 series ngk plug, it almost sounds like the extra boost is blowing out your spark

[Koshin]

gap at 22?? hmmmm, mine has a similar issue at times when the ambient temp gets hot...Ima try a regap maybe

[240life]

yeah its a trick I learned from an old SR guy, he done tons of swaps...now he does alot of RB stuff,...I need to do mine cause I just started boosting 21psi and after 16psi it starts to blow out my spark, Im still gapped at 32...guess I am going to have to keep it set on low boost for now

[rocket_dog]

OK Changed my spring back to 9psi, did not help f**k,Wireing seems fine and all the injectors are fireing, (disconect 1 and the idle slows down)I don't know my a/f and what my timing is set at, to be honest never even checked the timing did not know you should since there is no distributor.

Starting to think I have a boost leak somewhere or my AFM is bad, all the clamps are fine, everithing looks OK, but how do I check for boost leaks?

Thank you all for your help