When i go WOT in 2nd or higher gears, power and smoothness is fine untill 4500 rpms when the secondary kicks in then i'll get just a few stuters till redline, and it sounds like i can hear it breaking up in the exhaust note.I still reach full boost just sounds terrible and the car shakes alittle.Feels like alittle loss of power.Never had a problems with this set up,nothing new added. I think it's been maybe close to a year since i did spark change. It sound like little backfires when it's breaking up, and it'll get a louder every once in a while?

Would this be a ignition problem or fuel.

I 'm boosting 13-14-14.
intake
full exhaust
HKS FCON (fuel)
manaul boost controllers

 

fuel

if you have a FCON you must have a way to monitor you AFR's. What do they say.

 

i dont see any types of fuel mods other then your fcon which does not really help other then to juice your stock injectors. are you using higher octane gas as well? what are your a/f ratios (have you put yoru car on a dyno with a wideband?)? who tuned your fcon?

 

I don't have a a/f guage, i had HKS program the fcon for my mods. There's dials in the fcon that i can make adjustments, i'm sure that something else has to be causing this.I've been running this setup for over 2 years with out problems, but i was getting only 12lbs of boost, now i'm running 14 lbs. Does this sysptom mean i'm running rich or lean ? I know it's hard to tell with out a a/f guage, but i remember that a/f guage aren't accurate unless i have a wideband, which i don't have the cash flow for.

 

fuel? as in not enough fuel being delievered?