hIGGI

iTrader: (7)

do i have to change harness/ECU when swapping Series 5 turbo motor into Series 4 turbo car ?

i tough that i have to change harness/ecu only for NA to turbo swap.....

hIGGI

iTrader: (7)

+ for those questions

what would u do with blown series 5 turbo motor (probably just water seal or something not bad for rotors/housings and good series 4 turbo motor ?

FC3sRacingSD

Nope. There is a couple of things you have to do. You need to use 2 cycle oil premix in the gas.....1oz per gallon and if you have the early 87-88 model.....you need to use your injectors off the series 4 motor. Low impedance. If you have the later 88... June of 88 and on...then you dont have to worry about swapping injectors. I have been running this combo for 2 years and had no problems at all. It runs cleaner also because of the 2 cycle oil. It burns cleaner than conventional oil.

hIGGI

iTrader: (7)

what about using series 4 block and series 5 injectors, fuel rails, all intakes, turbo and stuff ?
what about oil metering pump ?

the krza

if you run premix like FC3sRacing said, you will have no need for the OMP.

....im not sure if you absolutely HAVE to do this, but you may as well