m50b25 non-vanos questions... fuel efficiency?

[Adrian_Visser]

im too lazy to search.

Good luck with that.:roll:

If you want gas mileage get a 2.79 or 2.93 diff out of an eta. Mucho low revs on the highway. I don't know how you plan on running ITB's unless you are going to:

a) go standalone and alpha-N tune OR
b) build a plenum and run a MAF with the stock engine management.

[pantelones]

haha, yeah no 4.10 for me. i probably should have stated that ill be running a 3.73lsd (maybe a 3.46 or 3.25) and a getrag 260 trans...

[nwe30]

heads up, don't get a 4.10 lsd haha. i have a non vanos m50 and i get some shit gas mileage.

[pantelones]

i am in the process of getting an e30 and have been doing a lot of reading about these cars. i plan on doing a 24valve swap, but i also plan on at some point putting a turbo on the car. from what i have read, the m50b25 non-vanos seems to be the best/easiest to boost, but please correct me if im wrong. in the mean time i think im going to tune it for fuel efficiency, so i was wondering if anyone has done this and what kind of numbers they were getting. when i do the initial swap im going to port and polish the head, make a set of equal length headers, and get a set of euro itb's and make them work. i figure with the motor flowing air smoothly, and a good tune i was thinking i could maybe get around 30mpg highway. im not really sure what these motors get stock, and im too lazy to search so if anyone knows please post it.