different ECU ?

[e30topless]

is there a difference in 325 and 320 ecu's ?

[Speedtouch]

Just the EPROM chip and the sticker on the box.

[EndaW]

The flash speed of the micro is faster on the 320 post 1988, before then both were identical appart from the dip chip.

[Speedtouch]

Pre '88 320i is analogue L-Jetronic! Motronic from '88 onwards.

[EndaW]

read your pm speedtouch

[e30topless]

thanks guys I am using a 320 one at the minute I have just done an engine swap from 320 to 325 so there's gains from fitting the 325 one ? it's a facelift model

[Speedtouch]

Not much really to be gained though the 173 is best for the 325i engine in terms of ease of chipping and reliability.

[e30topless]

thanks I will be chipping later no doubt !

[Brianmoooore]

thanks I will be chipping later no doubt !

If you're using an unmodified 320 ECU on a 325, you need to be chipping it NOW!

[e30topless]

325 ecu now fitted tickover is much better
are the afm's the same on 320 and 325 ? should i look for a 325 afm ?

[Brianmoooore]

AFMs are different.

[e30topless]

thanks brian i will look out for one