Hellen 72 - Miata NB2 up to 8 cylinders

Hardware inside and outside of the ECU
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Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

https://github.com/rusefi/rusefi/wiki/Hellen72 is a board for Miata NB2 designed to run up to 8 cylinders

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

This board has too many jumpers removed but still a very weird behavior on real vehicle. While that's not a legit jumper configuration it does not feel like adding jumpers would resolve this?

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

it's alive!



back to boring testing
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by andreika »

Hellen72c will have a WBO module.
In order to simplify the LSU sensor wiring, we used a board-to-wire connector on the board:
image.png
image.png (93.87 KiB) Viewed 1064 times
This is a XH series connector (XH-8A) with 2.50mm pitch and 3A current rated pins. We use double pins for the heater output and ground.
The best part is that JLCPCB has this connector in stock; actually, they have even two options: C146110 (white) and C37940 (black), over 10k+ total in stock.
image.png
image.png (235.85 KiB) Viewed 1064 times
Of course, this is a wide-known connector type with lots of mating female connectors with wires on ebay and aliexpress:
https://www.ebay.com/itm/10Sets-XH2-54-8Pin-1007-24AWG-Single-End-15cm-Wire-To-Board-Connector/201846818384
image.png
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Some of the sellers write "2.54mm" pitch, but that's not correct, it's actually 2.50 (anyway, all XH series have the same pitch). One should look for 24AWG or less wires, not 26AWG.
There are also versions with long wires (up to 30 cm):
https://www.ebay.com/itm/JST-2-5mm-XH-8-Pin-Male-Female-Connector-plug-with-30cm-wire-x-10-sets/171346705538

Or versions with raw contacts for manual crimping:
https://www.ebay.com/itm/20x-8-Pin-JST-XH-2-54mm-Male-Female-Connector-Plug-fr-7S-Balance-Battery-charger/171988306208

Most go with both male and female connectors, though.
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by puff »

Will it be just one WBO (considering initial notion of 8 cylinders, which probably implies two banks of cylinders, hence, two WBO sensors)?
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by mck1117 »

puff wrote:
Sun Mar 14, 2021 8:20 pm
Will it be just one WBO (considering initial notion of 8 cylinders, which probably implies two banks of cylinders, hence, two WBO sensors)?
it's really designed as a miata pnp board, so two sensors is overkill
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

Picture as received - JLC solders mini USB now! We just did not have time to change the board to use JLC SD card socket.

DFU button worked as expected

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

Auto-rotate is really odd, but more testing progress on wired board. Total success so far.

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

Delayed power off, something weird happens on power off. VSS/CAM/CRANK LEDs inverted



Scary stuff if ECU powered by USB



Soooo close to start but MAP does not read properly

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

R11 removal has changed MAP behavior - now it's showing closer to 100 kPa

Problem is it's showing more or less same 100 kPa even while cranking regardless of throttle application, that does not seem right. Sooooo close to fire up!

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

Nevermind that's all already covered by https://github.com/rusefi/rusefi/issues/2258

Once I've started running master instead of release things got way more proper in terms of power management - the delay is gone and USB does not confuse the ECU anymore.

Now we are back in NB2 Miata hall resistance hell. First three pages of https://rusefi.com/forum/viewtopic.php?f=2&t=1095 cover the drama which so far was worst with Frankenso/MAX9926. Looks to me like we have similar story here with Hellen72-c

Actual result, note broken 5-1-5-1 series on top line
2021-04-01_17_08_43_968rpm_247_maf_1.74-hellen72-c-as-is.png
2021-04-01_17_08_43_968rpm_247_maf_1.74-hellen72-c-as-is.png (66.21 KiB) Viewed 407 times
Expected - note different spacing on top line
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

Signal GND 4O
Signal 3V, 3Y

pictured here is "wired" Hellen72-c with default 0R R3 and R4, with only CAM, CRANK, GND and MR control/MR voltage wires.

I've already attempted to run a modified "connector" Hellen72-c with 2.7K R3 and R4 and engine sniffer looked bad in same exact way.
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20210404_nb2-hellen72c-wired-no-mods.jpg
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by stefanst »

Explain- what looks bad in that picture? I see the 1-2-1-2 on the cam and the 4 crank pulses in between.
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

stefanst wrote:
Sun Apr 04, 2021 10:04 pm
Explain- what looks bad in that picture? I see the 1-2-1-2 on the cam and the 4 crank pulses in between.
Note how VVT has 5-1-5-1-5-1 events on engine sniffer, should be 4-2-4-2-4-2 - spacing is really weird.

I've realized that I need to take engine sniffer images without the "display logic representation" mode in settings.
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

R3=R4=2.7K board

one logic_level_trigger and few physical level
Attachments
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2021-04-08_00_00_21_150rpm_0_maf_1.295.png (66.09 KiB) Viewed 306 times
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

Unmodified board, just ~9 wires between Hellen and vehicle - no injectors no coils, smooth cranking
Attachments
2021-04-08_00_10_09_478rpm_232_maf_0.051000000000000004.png
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2021-04-08_00_09_32_200rpm_0_maf_0.051000000000000004.png (73.02 KiB) Viewed 305 times
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

Same wired board with 0R resistors

Logic level VVT signal looks good.

I am worried about uneven spark cycle
Attachments
2021-04-08_00_29_39_521rpm_237_maf_0.051000000000000004.png
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2021-04-08_00_29_35_885rpm_238_maf_0.051000000000000004.png
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2021-04-08_00_29_33_756rpm_239_maf_0.051000000000000004.png
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2021-04-08_00_29_29_758rpm_240_maf_0.051000000000000004.png
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2021-04-08_00_29_22_704rpm_243_maf_0.051000000000000004.png
2021-04-08_00_29_22_704rpm_243_maf_0.051000000000000004.png (69.95 KiB) Viewed 302 times
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

So while I am fighting with NB2 trigger decoding we got things running on NA6 :)

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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

This USB connector is spaced a bit to clear the recommended case.
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110657539-94376500-81c9-11eb-985c-178839ba3ca5.jpg
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Re: Hellen 72 - Miata NB2 up to 8 cylinders

Post by AndreyB »

Default tune sparks both coils now, apparently it's MUCH easier to start a cold car on 4 cylinders than on two cylinders.





Unable to properly upload logs due to https://github.com/rusefi/rusefi/issues/2554
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