see the pic!
History
rb25de neo in a r32 shell
all supporting mods - fuel, ignition is not an issue (wasted spark setup), external gate is off the turbo exh housing at 35mm. air flow meter is a functioning z32 afm. tune is thru a nistune (or chipped std ecu).walbro 255,
turbo is 'unkonwn' but has been reported to me as a t04 variant. but from the graphs, it spools fairly late and should make more power than it is. the worrying part is the odd dip!! does anyone have an explanation or a theory from prev experience?
exhaust is 3" from the catback at least
attached dyno sheet is from the above config
my tuner thinks it could be a cam timing problem or an upset turbo with missing blades etc.
any help or suggestions much appreciated.