1G Motor swap ECU question

[metalicsnake]

i have a 90 tsi awd. the engine threw a rod so i bought a 91 tsi awd auto. i am putting the 91 motor in my 90. putting on my 14b, and the stock 90 injectors (450's i think) i am just wondering what ecu i should run? the original one in my 90? or the auto one from the 91? any help would be appreciated.

 

[DaveSM]

Use the 90 ecu for two reasons:

- You will be using all the 90 electricals I assume, so you will need to use the 90 ecu
- And the other ecu you have is from an auto, which has 390cc injectors so it won't work properly

 

[wishihadatalon]

and if you use a 91-94 ecu in a 90 you have to switch two wires that go to the ecu and your tach and speedo wont work.