Stock ECU MAF replacement project

[prj]

I think this tutorial will help you:
http://www.youtube.com/watch?feature...v=IrB-FPcv1Dc#!

This is very basic, I already know all that.
I just don't have a lot of experience with design, so I don't know what kind of chips exist for certain tasks etc.

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

[Billman]

Really off topic, probably best to talk about it elsewhere, but I am not interested in publishing everything yet.

You're right. I just saw it.

[Matas]

I think this tutorial will help you:
http://www.youtube.com/watch?feature...v=IrB-FPcv1Dc#!

[prj]

How do you stand on this? I would like to test stuff with my old Motronic.....still have it in case I use it on the SWB project.

Really off topic, probably best to talk about it elsewhere, but I am not interested in publishing everything yet.

BTW what would be approx the price for this conversion board?

I am aiming for a price of 200-250 EUR for a brand new genuine Bosch MAF in the correct housing with the board attached to it.

The board will be pretty cheap to make, it's the engineering involved that's difficult and the MAF sensor from Bosch + housing will be also about 100 EUR.
I am not an electrical engineer, so even simple things like reverse current protection are difficult for me, because there are many options and I don't know which to pick

For example reverse protection on the 0-5V signal from the MAF, would probably be a diode with a fuse or a MOSFET.
Reverse protection on the +12V feed could be just a series diode, etc...

Basically I have the following inputs:
+12V - connected to the car
GND - ECU ground
0-5V - Signal from HFM5

And the following outputs:
+5V reference for HFM5
0-6V - Conditioned signal to ECU

Considering this thing will be possibly installed by people who can mess things up (sorry ), I need to make sure that if things accidentally are connected the wrong way around, the board does not melt.

The ones that are connected by people, will be +12V, GND, ECU signal. So at the very minimum, there needs to be reverse voltage protection on +12V/GND, short circuit and reverse voltage protection on the ECU signal.

[Billman]

I will eventually post all data for free about the M2.3.2 ECU.
The secrets have gone on way too long

The gear required to tune it is:
2x Moates Ostrich 2.0, 350$
1x Latch adapter, 37.10$
1x SLC DIY2, 190$
1x Programmer 70$

Total is around 650$ not including shipping.
It is possible to use just 1 emulator though...
RS4 MAF's can be had at around 120 EUR, if needed, etc.

How do you stand on this? I would like to test stuff with my old Motronic.....still have it in case I use it on the SWB project.

BTW what would be approx the price for this conversion board?

[prj]

Let's put some life into the thread.

Today I received the evaluation board for the ADUC814 microcontroller.
It has an on-board 12 bit DAC and ADC, 12 bit should be precise enough (5V/2^12 = 1.22mV precision).

I will be writing the test software for it, and trying on a car.
I have decided initially not to try and come up with a connector. Instead, the initial boards will have terminals, that will allow wires to be connected to it directly and fastened down.

This would mean cutting off the stock connector, and fitting the little box directly to the existing wires, which would then have a HFM5 connector exiting it.

Here is a picture of the evaluation board. It is quite big and has a lot of stuff on it, but the processor itself is tiny. I put a 5p coin next to the processor as a size comparison.
The finished custom board will be probably about 4-5x the size of the processor itself - very small.

[A80Avant]

but I think most standalones have been fitted not because the stock system is bad or hitting limitations, but because almost no one knows how to tune it.

exactly what i meant, but you also have to take into account that for anyone who tunes the car a little bit at a time, having motronic and yourself to readjust the map for every change would end up costing the amount of an aftermarket ecu (even the expensive ones).

For those who do one upgrade all at once and that is it, sure, its more logical now that there are the solutions for the motronic to go that way.

also, just because you think the aftermarket ECU are not as good as the motronic, doesnt mean we have to agree with you.

[prj]

Btw, realistic design limit for Motronic in Porsche guise is about 700 crank hp.
After that you have to start underscaling LOAD to get where you want.

Doing this you can probably get to 1000hp, but it's not using the ECU as it was intended by it's designer.

[prj]

I will eventually post all data for free about the M2.3.2 ECU.
The secrets have gone on way too long

The gear required to tune it is:
2x Moates Ostrich 2.0, 350$
1x Latch adapter, 37.10$
1x SLC DIY2, 190$
1x Programmer 70$

Total is around 650$ not including shipping.
It is possible to use just 1 emulator though...
RS4 MAF's can be had at around 120 EUR, if needed, etc.

I think it is a good option.

Also, there are not that many ECU's which are as good as the stock management.
VEMS is not quite there yet, KMS I did not like yet either.
Tatech, MOTEC, Autronic, but they are very expensive, especially if you want a plug and play solution.

There are legitimate uses for standalones, but I think most standalones have been fitted not because the stock system is bad or hitting limitations, but because almost no one knows how to tune it.

[A80Avant]

you dont need an aftermarket for purely dragracing. Dont oversimplify things.

nowdays you can easily fit an aftermarket ecu and be as good as the motronic, simpler, still safe and easy to be tuned by any tuner, and not the very few remaining that know the old motronic.

however, ill give that to you, that what you have done and are doing to that old ECU is trully amazing, and you just came a bit too late for some of us. Whether that is good or bad, its a different story.

[prj]

I dont read every posting...but development in this sector is amazing... my motronic time is over now... it is everybodys individual decision to buy or not to buy... or to drop the whole motronic stuff... I do not try to persuade anybody to anything... it is an offer... not more...

Too bad.
Probably should have helped you more, as I don't see any point to put aftermarket ECU on these cars unless you want the car for pure dragracing.
Especially after I post all my info... this will happen soon(tm).

[blackS2]

As for the development - I am planning to develop a box so people can use a HFM5 without altering their current chipset.
Fit it to stock/chipped/rs2-ed car and have the car behave exactly like before, without touching the ECU.

I believe I explained that in this thread many times.

I dont read every posting...but development in this sector is amazing... my motronic time is over now... it is everybodys individual decision to buy or not to buy... or to drop the whole motronic stuff... I do not try to persuade anybody to anything... it is an offer... not more...

[prj]

and one in Spain also ,works perfect

I totally forgot about you, sorry

[Rocco]

Because for a custom tune, that box is not needed.
Everything can be done by recalibrating the Motronic properly, instead of using a piggyback.

Unfortunately, not even DAMOS or Funktionsrahmen will help you calibrate the Motronic for a different MAF.
A full disassemble and tracing electronics with a scope at many points is needed to understand how it works.

Funktionsrahmen just says "KFUN"... without much explanation.
I believe Bosch calibrated the LMM using a special in house tool, which no one has.

P.S.
I have got 3 cars running in russia with HFM5 connected directly to ECU, 1 car in UK and 2 cars in Estonia.
No box needed!

and one in Spain also ,works perfect

[prj]

As for the development - I am planning to develop a box so people can use a HFM5 without altering their current chipset.
Fit it to stock/chipped/rs2-ed car and have the car behave exactly like before, without touching the ECU.

I believe I explained that in this thread many times.