inlet manifold and injector help please

[andy325]

hi all

can anyone tell me if the early 325 and later 325 had the same inlet manifolds?

can anyone tell me if the early 325 and later 325 had the same fuel injectors?

is a 320 inlet manifold the same as a 325 inlet manifold?

i have a early 325 sport mtech 1 and thinking of swopping for the later type motronic so from my understanding i need -

crank pulley and crank sensor
wiring loom
ecu

is this right or have i missed something

[kam-325i]

As far as i know, all the 325 engines were the same apart from a difference in comprestion ratios for early/late models....

I dont think the 320i intake manifold will fit on the 325i.

[andy325]

from what i know my car has motronic 1.1 as did all early 325's and the later cars had motronic 1.3

it is this motronic 1.3 i wish to convert to and just wondered how much work it was

[kam-325i]

i cant really seeing it being much work, the hardest bit being changing the loom part from the engine connector to the ECU and the engine loom....

Dont know of many people that have done a 1.1 -> 1.3 upgrade on a M20B25

[kam-325i]

I have just looked at the part numbers for the 325i ECU, and there appears to be 7 different ones......

325i 2.5 litre (M20) 85-87 Bosch Motronic ML3.3 0 261 200 073
325i 2.5 litre (M20) 85-87 Bosch Motronic ML3.3 0 261 200 081
325i 2.5 litre (6 cyl) 87-88 Bosch Motronic 1.3 0 261 200 164
325i 2.5 litre (M20) 88-90 Bosch Motronic 1.3 0 261 200 173
325i 2.5 litre (M20) 90-92 Bosch Motronic 1.3 0 261 200 380
325i 2.5 litre (6 cyl) 89-92 Bosch Motronic 3.1 0 261 200 402
325i 2.5 litre (6 cyl) 89-92 Bosch Motronic 3.1 0 261 200 403


They dont make it easy do they.........