so this morning i get my replacement post maf hose, a mishimoto(matches my timc hoses), and replace it at lunch with a minimum amount of fuss. little bit of trimming but i already knew they came a bit long to accommodate cai intake systems. installed, new hose clamps and a quick seal check and ecm reset. drove back to work and all is good. no quick reset though as i was running a bit late.
tonight on the way home though. i hit the highway with intent of making the ecu happy. oh yea...happy all right. turbo? Not Happy. boost fluctuating at mid to full throttle. basically anything past wastegate pressure and the needle is a swinging. then the boost spike hit, thankfully as i had my eye on the gauge. spiked to 15-16psi and then dropped. further attempts at mid to full throttle(rpm or gear didnt make much difference but i never went past 5500rpm)resulted in the same behavior. spike to 15-16 psi then drop to 10-11psi and hold. maybe a little wiggle. and my foot would come right off the gas too.
up until todays after maf hose install and ecm reset my boost has been a absolute rock at 14.5 psi. never spiked, never dropped. definitely never went over factory boost levels. nothing else has been changed and i am still untuned. currently, all the plastic hoses have been replaced. timic, turbo inlet, and post maf are all now after market. the afta-maf was changed out for two reasons. ugly. uuugly. and, it was worn really thin in one of the bellow creases. swapped to illuminate unmetered air. ive checked all the vacuum lines and the lines for my boost gauge too. gauge aside, i can actually hear the turbo boost spike and drop when the gauge does its dance.
post maf hose the straw that broke my ecm's learning curve? i didnt think(with as much as ive already replaced) that it would cause that much chaos but i am about to remove it to wrap up the old plastic piece in duct tape and reinstall untill i get it figured out. thanks n stuff in advance guys n gals.