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I will be using rusefi to control a bmw m62tu 4.4 v8. Aftermarket ecu is necessary due to the addition of a turbocharger, map sensor, and n75 electronic wastegate control. I am a software dev so access and contribution to source code is important to me.

The engine has electronic throttle and variable intake camshafts which will make this interesting. Will use the stock engine harness, and I already purchased the correct plug and 134 pin breakout, nice!

Tentative plan is to gut a stock ecu and turn it into a translator box using the breakout, and have the rusefi in an adjacent separate enclosure. This seems easiest to me, I am sure a board could be designed to use the 134 pin plug directly but I am a software guy not a hardware guy. Perhaps once I am further along I can do this.

Welcome to the forum!

https://github.com/rusefi/rusefi/wiki/Hardware

You probably should not use two microRusEfi to run this. Your choice of hardware is older less visually appealing Frankenso which is available assembled today, or waiting for X number of week/months for a much nicer Proteus.

Proteus appears to be the best choice, with dual h bridge. That would leave only the ignition coils for me to figure out. Easy enough to switch to smart coils, but that would circumvent usage of oem harness.

Cleanest solution would be to design my own breakout with integrated BTS2140 igniters.

alanmhayes wrote: ↑

Tue Apr 14, 2020 5:37 am

Proteus appears to be the best choice, with dual h bridge. That would leave only the ignition coils for me to figure out. Easy enough to switch to smart coils, but that would circumvent usage of oem harness.

Cleanest solution would be to design my own breakout with integrated BTS2140 igniters.

Proteus 0.3 is about to get ordered - see its thread here if you're interested: https://rusefi.com/forum/viewtopic.php?p=36159#p36159

Ignition coil wise, a few of us have wired up a handful of FGP3040G2 IGBTs for our coils, and that's seemed to work pretty well. You don't want to use a mosfet (like the bts2140), since they don't have active clamping and high voltage tolerance like an IGBT does. You could also use an off-the-shelf igniter module, or swap to smart coils, as you suggested.

alanmhayes wrote: ↑

Fri Apr 10, 2020 9:25 am

n75 electronic wastegate control

What protocol does a BMW wastegate actuator speak?

mck1117 wrote: ↑

Tue Apr 14, 2020 7:32 am

alanmhayes wrote: ↑

Fri Apr 10, 2020 9:25 am

n75 electronic wastegate control

What protocol does a BMW wastegate actuator speak?

N75 is just a pwm boost controller, will use with dual 38mm external wastegates. I would prefer to directly control the wastegate, but the only aftermarket solution (turbosmart) for this is excessively expensive.

alanmhayes wrote: ↑

Tue Apr 14, 2020 8:23 am

N75 is just a pwm boost controller, will use with dual 38mm external wastegates. I would prefer to directly control the wastegate, but the only aftermarket solution (turbosmart) for this is excessively expensive.

Ah - got it, that makes more sense. PWM is easy to control, so should be covered there.

Im about to do the same with a M62tu in a E39 535i, but only normally aspirated and my own design ECU.
Not having even started on the car,any idea whats not going to work once the factory ECU is removed or should i be piggy backing on to the standard system?

I have had good success with BMW coils connected via the VW 1.8t ignition module.