Hey guys i was wondering if anybody could help regarding the Z4 ECU....What i would want to know if possible if anybody knows if the Z4 ECU is off a WRX or an STI Impreza....and if there is any difference between the blue label Z4 and the black label Z4?...Thanks in advance ..a picture of the ecu is attached...

 

Z4 ECU is 1994-1996 WRX and is 260ps (not BHP, probably around 250BHP, not 100% on that). No difference between the skickers as far as I know.

 

Boost Targets & Fuel-Cut Limits
WRX/STi Saloon ECU's 2C, U8, W6, W9 - As above, 11.47psi held to redline. Fuel-cut 14.57psi
WRX (1995/96) ECU Z4 - 12.71psi, dropping to 11.78psi @ 6600rpm. Fuel-cut 15.65psi.

This is what the inside of my blue stickered Z4 looks like.

 

Thanks alot guys..that clears many things....Cheers..