Stock ECU MAF replacement project

[Sleeper_Avant]

china housings shouldnt be a problem, i had 100 made for use with Impreza`s and they were perfect, again high level carbon fiber spoilers from china, all 100% perfect

[prj]

Yea, the only way to make the female connector would be CNC.
I don't think the actual cutting is that bad though. The MAF adapter just becomes the new connector.

So, I finished up the firmware.
I have:
* Firmware mappable to 4096 points, 0.001 volts precision (overkill, but I have the free room, so why not, and why complicate things with interpolation).
* XDF for TunerPro and C++ plugin for TunerPro that allows me to adjust stuff.
* Tested the firmware with a potentiometer on my development board, tested some curves, everything works as expected.

So really now all that is left is making a board, and then getting the calibration data.
Once this is done, I will try and beta test with some people.
Need to get some china housings though.

[driftin jo]

Isn't there an ability to make it plug n play? Like putting a female connector to the board that's like one on the maf?

You can't get the female connector, well not without a huge cost increase anyway, don't you think he would have done this if he could have?

[Matas]

Isn't there an ability to make it plug n play? Like putting a female connector to the board that's like one on the maf?

[Error404]

[prj]

And we have progress.

I have written the firmware and have the rev1 board laid out for the converter.
The firmware is working on the evaluation board - I have mappable output based on input.

Next step is to print a few boards and order the components.

Now, the last remaining problem was the connector.
I believe the solution will be:

1) Cut off the old connector
2) On the board I will have these:
http://www.farnell.com/datasheets/652883.pdf (unless someone has a better idea.
You just put the wire in the position and push the cap on, done. No soldering, crimping, tools.
3) On the other end of the board the HFM5 connector will already be hanging out, so you just plug that into the new MAF.

So, going forward:
1) Cars <450hp will use the RS4 element in an Alfa housing, this should fit like stock, and with the converter the electrical output will actually match the RS2 MAF.
2) Cars >450hp will use the Pro-M 3" Pro-Tube blow through solution, which can read enough air for 1200 horsepower. They will also use the same converter, but it will be specially calibrated and the ECU will be specially calibrated as well.

Currently writing the software for calibration...
Goodbye wires.

[quattro84]

Indeed, i am watching these topics very closely.
I don't have the time nor the skills to reverse engineer the code but i would even be willing to pay for a workable guide with software setup based on the stock motronic.

[EspenW]

This sounds VERY promising

[prj]

Thanks for the offer...
I have a few things left to do, then I might take advantage of it

[hcman]

I will probably just make something, and then take my circuit to an electrical engineer for a 2nd opinion. See what they say.

Hi, i can help you with schematics, with protections etc., feel free to contact me

[prj]

Actually you are right.
LM309 costs something like 30 EUR.
Ignore my previous posts I searched for the opamp for some reason... getting sleepy.

I guess LM2937 it is then with a bunch of caps around it, that takes care of the reverse polarity protection as well.

[prj]

...

[Matas]

At my place your voltage regulator is quite pricey and for 5V it should get at least 7.4V. LM7805 has same characteristics and is very cheap. LM2937 is even better with wide working temps and low voltage dropout

[prj]

Well, my hobby is electronics, maybe I can help.

So, which voltage regulator would you use?
I am thinking of LM309

[Matas]

Well, my hobby is electronics, maybe I can help.