MembersPage/GergelyLezsak/BigSixTurbo (2006-04-07 20:22:04)

Big Six Turbo

BMW called M30 engines as "Big Six" (M20, just like mine is "Little Six"). This page is about an M30B34 turbo engine, originally in a 745i from 1985.

normal_45i%20017.jpg

It's not a weak car even it's stock form (3.5 Turbo, automatic, see pic),

but this engine is now in a light chassis (e30):

normal_alkatr%E9szek%20022%7E0.jpg

This page is about GenBoard-ing it!

Original setup

Car outlines:

Buylist at MembersPage/GergelyLezsak/BuyList


Project

Electronically the M30 engine seems very similar to the M20 little brother (from the same era: motronic 1.3). Even their original ECU can be swapped, and the engine will start up! (mapping is not the same, so don't use this as a common practice)

After i've received[first part of the order] I made a new harness, and ordered a new 3.3 GenBoard. Now, the car is running stable with GenBoard.


UPDATE

2006.04.03

At least we changed to the latest firmware. (1.0.38)

BMW-style dual IAC valve is fine now. And car had been mapped nice.

One strange problem with MAP: on boost, MAP values are less than real (probably the half of real) values.

I'm using 250kPa MAP sensor, and double checked the values with two (known good) analogue gauges.

I probably misconfigured something with the new firmware.

Config and tables are here: http://quasar.dynaweb.hu/~lezsi/bmw/attila/configtables20060402.txt

Needed:

2005.12.28-29

Car is running with GenBoard :)

We'have removed the whole factory harness. (Took a while to reproduce everything) Some experience: TPS wire's and IAC open/close wire's direction is always replaced :)

Had some difficulties with digital outs; EC36pin15 (Which is P259/5) didn't do anything (with the fuelpump). Tried to move it to the next pin (P259/6), resulted the same. Finally chose a different chip: S259/5, EC18pin5. It's working. Couldn't imagine what could be wrong, at the test time fuelpump out was working.

After we've got fuel I made it flooded. I don't know how but my previous calculations worthed nothing. I thought fuel_req at the 12ms range, but I needed to half that, and maybe we'll half it again. Idle (which is horrible now, but that's mainly pid-related) is around 1ms pw. Don't know why, these are ~300ccm injectors. Maybe too slow to close? Will try to lower pwm value of 30%, and PowerFlyback if necessary...

Since we've got 25cm of snow the day the car started, couldn't tune it yet...

Some pics:

Dashboard:

thumbnails_analog%20muszerek%20010.jpg [in big]

Nice work with the LCD mounting.

The first day at the backyard (no snow at all):

thumbnails_udvar2.jpg [in big]


TODO


and a [movie clip] for motivation

//Emil Larsson