m20b20 vs m20b25

[mikeedler]

they are the same exact ecu for the 1000000000000000000000000time!
the smaller injectors, and the fpr combined with the lambda (oxygen sensor) make it all work.
END!

[elsabor67]

I go with mike on this one. I've driven 320i's before and to me they feel slow and sluggish at times and to me swallow the same amount of gas. I would do the whole 2.0 to 2.5 swap if I was you. You won't regret it.

[Rocla]

I don't think you'll notice any difference in fuel consumption unless you floor it everywhere, that M20B20 is really thirsty for what it is.

It is very thirsty, and yes you will notice, m20b25 will most likely take less than b20.

[mikeedler]

I think it depends on your driving style really. I like to zip around when I am in an e30, and honestly get the same mileage with an m40/m10 318i as i do in an M20b25- I seem to always have the pedal almost to the floor in the 4 cyl. cars where the 2.5 requires a whole lot less throttle to accel. the same.
and yes, the dif. between a 2.5 and a 2.0 M20 is like night and day!!!!!

[steinbachphoto]

I want to do the swap to, but a 320i is a rarity over here in NA and I don't want to ruin that :(

[alpinaclone]

Do the swap! I have had two 320is, one of which i swapped to a 2.5l. It totally changed the character of the car. It made it better on the autobahn, better in the city, better everywhere.

[TOPSPEED]

I have a 320i Touring here in Canada and no matter how rare this slowpoke is ... it's getting a larger heart, just unsure how big. Currently have 2 M30s in storage, one from a E28 (complete swap with brackets) and a M30 from the E34 but seeing how much work they require to install ... I might just go with the M20 swap and track the thing till it dies.

[frantic]

All this talk about ECU's...

Does anyone know if a b20 AFM and b25 AFM are the same? If they are both from a motronic 1.3 e30? I have a b20 AFM that came out of my 89 320i with motronic 1.3 and I wanna know if I can use it with my 2.7i build which will be converted to motronic 1.3 using a 164 325i ECU.

And on another note, Hopefully I will get rid of my m20b20 within the next couple of weeks for my 2.7i beast. I am sure I will be much more pleased :)

[thornado327i]

I had b20.

After trying to find a descent b25 I ended up with putting eta block and alpina ecu in there. The difference was enormous! After a year or so, I've put b25 stuff to go leavig the b20 head (modified though). Again - power gain was really noticable. Fuel consumption was too...

[liquidgroove]

I have a B20 as well, ECU ends with 172. I thought B25 normally has 173 ECU?

I believe AFM has different number as well.

Anyway, B20 sux......

[ADEN]

but, I'm some how happy with my clean b20, i have beaten a mustang on the high way.but i haven't tried the b25 and i bet it's a bit stronger.I've searched for b25 here in Yemen but no success, do you guys know how much the b25+shipping to Yemen will cost?
I'm sure it's a fortune.