Rb25Det Missing Underload

[johnny boii]

hey guys i have what i believe to be a 1.5 series r33 with a rb25det in it

i fitted a rebuilt and hiflowed stock rb25det turbo to it after i did that the stock boost raised from 7psi to 9 psi i had no issues was running fine.

the other day i fitted a turbosmart boost tee into the equasion so i could raise the boost to about 12 psi once i had fitted my fmic

i fitted the boost tee having alot of trouble then realised that i had to take the ball and spring out of it to allow it to run on my engine.

now my issue is that once i raise the boost to about 12psi under wide open throttle it misses and feels like it is fuel cutting like it completely shuts down the engine for a millissecond and comes back on but only half throttle it boosts fine. when i turn the tap fully closed then open it about a half a turn it runs the stock 9psi and drives fine

i have replaced the plugs the day i fitted the boost tee

any help would be fantastic please help ahahah

Edited May 8, 2011 by johnny boii

[ahh 33 s2]

Standard computer? If so that would be ur problem is my guess

[JonnoHR31]

if its standard ecu your maxxing the afm and its cutting out to protect the motor. keep the boost under 10psi until you can get an aftermarket ecu

[johnny boii]

yes standard computer...i was planning on a safc2 would that fix the problem or?

[JonnoHR31]

it'll help but its not ideal and you certainly wont be able to get the most out of the highflow. a full aftermarket computer and possibly z32 afm and injectors, depending on power goals and the ecu, is the best solution.

[johnny boii]

i wanted around about 300hp atw but i dont really wanna splurge the money on a PFC for now so i guess im stuck to 9 psi hahahah cheers guys

[JonnoHR31]

300rwhp would be pushing it for injectors and afm aswell

[johnny boii]

if i had the money for a pfc i would have the money for injectors afm intake mani id do the lot haha

[ahh 33 s2]

well dont waste money on a SAFC and save for a bit longer for a PFC, its well worth the wait