work in progress bosch 7506280 GDI driver

Hardware inside and outside of the ECU
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AndreyB
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bosch 7506280 GDI driver

Post by AndreyB » Wed May 08, 2019 12:27 am

BMW 760 e65/e66 had separate electrics boxes just to drive direct injectors - those were the early days of GDI. Each v12 engine was running using two of these blocks - each box controls 6 lowZ injectors. Overall they had 5 separate control units to run that N73 v12 engine.

We got one of these boxes - bosch 7506280 from BMW 760 - to click a GDI injector. Two wires to GND, two wires to +12v. Low-side control signal - and it's alive :) Next step is hooking this to an oscilloscope.

Engine wiring diagram is located at https://github.com/rusefi/rusefi_docume ... Series_e65

The larger chip says 30429, obviously google knows nothing about this 30429.

P-MQFP-44 chip is infineon sakc505 - that's a 8-Bit Single-Chip Microcontroller with CAN, datasheet is available.



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Re: bosch 7506280 GDI driver

Post by 960 » Wed May 08, 2019 8:50 am

This should be the diagram for the ECU:

GDI Driver CJ830:
MED7511C2_439_7.1.3.pdf
(143.98 KiB) Downloaded 38 times
MCU:
MED7511C2_439_7.1.2.pdf
(278.13 KiB) Downloaded 30 times
IN/Outputs:
MED7511C2_439_7.1.1.pdf
(378.46 KiB) Downloaded 24 times
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MED7511C2_439_7.1.3-rotated.pdf
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Re: bosch 7506280 GDI driver

Post by 960 » Wed May 08, 2019 12:47 pm

Just saw your PCB picture.

Is this a pure GDI driver box?

Is it only controlling two injectors?

The big IC looks like the ASIC you find in all older Bosch ecus.

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Re: bosch 7506280 GDI driver

Post by AndreyB » Wed May 08, 2019 1:43 pm

960 wrote:
Wed May 08, 2019 12:47 pm
Is this a pure GDI driver box?

Is it only controlling two injectors?
Yes, just edited first post in this thread to make it less confusing :)
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Re: bosch 7506280 GDI driver

Post by AndreyB » Sat May 11, 2019 6:38 pm

Do we know enough about typical GDI flow rate and typical rail pressure to know typical GDI pulse duration per engine cycle?

Are we interested to hook up an oscilloscope anywhere? Can we/do we need to measure current, voltage or what?

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Re: bosch 7506280 GDI driver

Post by OrchardPerformance » Mon May 13, 2019 8:47 pm

Without even looking to check I can say you are looking at anything from 12 to 35 bar for pressures depending on the injectors so pulse width is all over the place.

In terms of running the engine (ignoring emissions and knock limited stuff) then any pressure around 20bar will do and adjust the fuel from there.

Probably worth just fixing the pressure and adjusting fuel until you can start it as normal.

Are there no flow rates for those injectors published?

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