Micro Rusefi for a Renault KM4 engine

What engine are you torturing? Is it inside some car?
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JPh
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Micro Rusefi for a Renault KM4 engine

Post by JPh »

My project is to tune a MRE for a K4M engine. The idea is to have a stand alone ECU for trackdays with its own loom and easyly go back to OEM for street use. I will share the steps I follow so perhaps readers will not have to search on the forum, wiki, github, slack channels to find some informations.

JPh
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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

First step : connect the MRE to tunerstudio.
Some problems with the drivers (see micro rusefi connection to tunerstudio viewtopic.php?f=5&t=1671).
Now everything is working and some hours will be necessary to use all the features.

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

Next step : cut an OEM loom from a spare engine to make the mre one. Need it to calibrate the sensors and for the bench tests. With the mre connector it's easy to make.

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Re: Micro Rusefi for a Renault KM4 engine

Post by AndreyB »

JPh wrote:
Fri Mar 13, 2020 8:04 pm
I will share the steps I follow so perhaps readers will not have to search on the forum, wiki, github, slack channels to find some information.
We need more threads like this, thank you!
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

You help me a lot making such a product available. Open source and co-desing are great!

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

Today construction of the flywheel drive.
Why bother with hardware when we can simulate it?
Because real world signals learn you more about functioning, gap limits, voltage increase with rpm, sync loss...
I have all I need handy, so I jumped in.
À VR simulator is also on the list, I don't want to spin my heavy OEM wheel 10000 rpm...
When I will go for an aluminum flywheel, the different trigger wheel will also be worth a spin.

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

It's running!
15848068282586754662431216785393.jpg
15848068282586754662431216785393.jpg (2.28 MiB) Viewed 768 times
60 to 5000 rpm

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Re: Micro Rusefi for a Renault KM4 engine

Post by AndreyB »

JPh wrote:
Sat Mar 21, 2020 4:10 pm
60 to 5000 rpm
Can you safely go above 5000rpm?
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

I'm limited by motor power, and fear getting the flywheel flying...
High rpm test will be done with function generator.
I will capture the signal at 5000 and feed the wave form in the generator and then go up in revs.
But I have to find an amplifier to get the right voltage level.
I will post a 60 and 5000 rpm sample for reference purpose.

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Re: Micro Rusefi for a Renault KM4 engine

Post by AndreyB »

Thank you for amazing content! :geek: :ugeek:
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

I hope there be more to come!

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

Here are the waveforms for low and high speed :
slow speed.png
slow speed.png (7.78 KiB) Viewed 753 times
high speed.png
high speed.png (7.95 KiB) Viewed 753 times
If there are some data scientists in the community : attached the samplings corresponding.
Sensor gap 0,5mm.
Attachments
high speed.txt
(53.77 KiB) Downloaded 11 times
slow speed.txt
(53.66 KiB) Downloaded 12 times

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Re: Micro Rusefi for a Renault KM4 engine

Post by mck1117 »

JPh wrote:
Sat Mar 21, 2020 6:08 pm
Here are the waveforms for low and high speed :
...
If there are some data scientists in the community : attached the samplings corresponding.
Sensor gap 0,5mm.
Signal looks great! Should do just fine with MRE.

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

Some data calculated from the above test :
Rpm 71 peak to peak 1,1v
Rpm 5555 peak to peak 88v

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Re: Micro Rusefi for a Renault KM4 engine

Post by dexter_lab »

Looks VR by the book :) the TLE8888 will handle it. It will be interesting to see how it look like when ignition is attached. Do you plan to simulate with hardware as well?

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

Yes my MRE will be tested with hardware up to 5500 rpm.
From that point to max possible it will be tested with a signal generator.

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

Now that injectors and coils are running, it will be time to test sync with spinner

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

Not much time to test today.
First run the vr sensor was wired inverted : there were two big spikes on the fast logger with the shorter first. Mre worked with 60/2 trigger but timing was not on mark.
Inverted the vr wires spikes are in order after but 60/2 trigger didn't work anymore.
Switched to 60/2 vw had sync losses at low speed.
Need more research and work on the system.

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Re: Micro Rusefi for a Renault KM4 engine

Post by mck1117 »

JPh wrote:
Wed Mar 25, 2020 7:31 pm
Not much time to test today.
First run the vr sensor was wired inverted : there were two big spikes on the fast logger with the shorter first. Mre worked with 60/2 trigger but timing was not on mark.
Inverted the vr wires spikes are in order after but 60/2 trigger didn't work anymore.
Switched to 60/2 vw had sync losses at low speed.
Need more research and work on the system.
What do you mean timing wasn't on mark? The trigger logger page in TS should show 58 short teeth, then one tooth that's 3 times the height. You also don't need to swap the wires - there's an option in the trigger input page to invert the trigger polarity.

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

To test I ran on fixed advance, setting it to 0.

I don't know what is 0 advance for rusefi.
On other systems it's during the large tooth and the next normal tooth is number 1.
During the different tests I made, the timing light showed a point in the large tooth, this point changed dured the different test I made.

But this was not the problem for me : the problem was with inverted vr 60/2 setting for trigger worked but shifted with rpm.

With normal vr wiring 60/2 stopped to work and 60/2 vw worked but only at high rpm. At slow rpm the mre lost sync randomly for a short moment an re synced and so on.

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Re: Micro Rusefi for a Renault KM4 engine

Post by JPh »

After some more work and with Gwendal's help, mre is working now.

My problem was an operator's error. I mis interpreted TS fast logger : I thought that the mid long tooth followed by the long tooth was the sign of an inverted vr polarity. This was wrong, if inverted both 60/2 and 60/2 vw were no more working.

With a working sync I could check ignition accuracy.
First with an old timing light. I saw some stability problems that needed more checking. With the scopes, the problems disappeared so my timing light has triggering problems.

I decided to make a new test setup to have real world results. I know you cannot pick up the vr signal to sync the scope. There are common ground problems which make the ecu malfunction.
So I added an other vr sensor only for scope sync :
IMG_20200326_182209.jpg
IMG_20200326_182209.jpg (2.71 MiB) Viewed 443 times
There is an angle between the two sensors, So I set the fixed ignition advance to 2 degrees which compensated this angle.
Here the résultats for different rpm :

750 rpm
Image750.png
Image750.png (6.73 KiB) Viewed 442 times
2500 rpm
Image2500.png
Image2500.png (5.96 KiB) Viewed 442 times
4000 rpm
Image4000.png
Image4000.png (7.04 KiB) Viewed 442 times
5700 rpm
Image5700.png
Image5700.png (7.25 KiB) Viewed 442 times
For me these are very good results.

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Re: Micro Rusefi for a Renault KM4 engine

Post by mck1117 »

Looks great, that's a good test!

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