Members Page/Gergely Lezsak/Big Six Turbo

MembersPage/GergelyLezsak/BigSixTurbo (2005-12-18 01:29:43)

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

Here I try to put together what's needed to GenBoard it

Original setup

Car outlines:

Engine: M30B34 turbo, 3400cc, 6 cyl inline, 12 Valves, SOHC
Fuel injection: Bosch injectors (part no. 0 280 150 200) maybe 270-300 cc/min @3/3.5bars (different sources say different values). R=2.4-2.6 Ohms.
Fuel pump: Stock
Stock pressure regulator, with manifold pressure reference
Turbo: stock KKK K27
Idle control : stock. (similar to M20)
Intake: stock AFM, Small stock air-to-air intercooler
Factory throttle pos switch (3 state; idle, between and WOT)
VR crank-trigger: 60-2.
- M20 baby series engine uses similar crank triggering, see MembersPage/GergelyLezsak/Trigger
Cam position sensor?
Coolant sensors - similar to M20
Knock. Two factory installed knock sensors.
More sensors: O2 sensor: narrowband , IAT in AFM
orig ECU: Bosch Motronic 0 046 430 136 0

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)

Since I've received the [first part of the order] I'm going to make a new harness, and ordered a new 3.3 GenBoard. I want to put it together on my M20 and then move the working system (with changed values of course) to the M30 engined car.

TODO

LCD with cable connection
- Done: not exactly with the specified resistors, but it's perfect. [pic1], [pic2]
Make whole harness
External MAP housing with connections
When GenBoard is ready, flash it with my IAC-tweaked firmware and test it on a "known good" (f.e. existing) harness
Swap the harness and test it with a "known good" (f.e. existing) ECU

Marcell, please use my [original pinout] as a template for the new ECU.

Here is a similar car: MembersPage/MattiasSandgren/BmwSevenTwentyEight - Unfortunately the owner had to sell it for 1300 euro..
Another similar car: MembersPage/MattiasSandgren/BmwFiveTwentyEight (Will be my daily driver //Mattias)

and a [movie clip] for motivation

//Emil Larsson