Got my test mule running for two seconds on this board today! That's a huge success, first spin seems to be functional!
Tomorrow I hope to add MAP sensor wiring to get it properly running
Re: microRusEfi pnp Miata MX5 NB2
Posted: Thu Mar 26, 2020 1:26 pm
by stefanst
That's great success indeed. Perfect way to not go crazy (or crazier as the case may be) during the shutdown.
Re: microRusEfi pnp Miata MX5 NB2
Posted: Sat Mar 28, 2020 1:39 pm
by dexter_lab
Yeah looks great I am checking against my harness.
Some concerns to express
1. the heat around mosfet for 5V, could be a problem
2. if I remember correctly the tach output is 12V, it was not working with 5V (memories from 5 years ago)
3. from https://raw.githubusercontent.com/wiki/rusefi/rusefi_documentation/Hardware/pnp_microRusEfi_nb2/hw72nb.pdf
3.1 D21 and D23 should be on pin 37,38
3.2 12_IGN_KEY on 4S - I have to check the hardware, as on my scheme 4S is not connected, same for 3H
Re: microRusEfi pnp Miata MX5 NB2
Posted: Sat Mar 28, 2020 2:54 pm
by dexter_lab
About alternator warring lamp, you are going to control it (on/off) via in PA15 from STM?
2. if I remember correctly the tach output is 12V, it was not working with 5V (memories from 5 years ago)
3.2 12_IGN_KEY on 4S - I have to check the hardware, as on my scheme 4S is not connected, same for 3H
microRusEfi jumper needs to be set to +12v high-side, I believe we feed +12v signal into both tach and alternator
First order! This board goes to MA hopefully there will be a report here
Re: MREAdapter72 pnp Miata MX5 NB2
Posted: Sun May 17, 2020 6:19 pm
by AndreyB
That's how OEM case looks like
Re: MREAdapter72 pnp Miata MX5 NB2
Posted: Mon May 18, 2020 5:55 pm
by AndreyB
On this board both OEM pressure sensor and external MAP are possible (we made some mistakes on 0.2).
external MAP 5v: pin 4K added into OEM harness, MRE72_0.2 has it
external MAP signal: pin 4U added into OEM harness, MRE72_0.2 has it
external MAP GND: pin 3Z added into OEM harness, MRE_02 work-around: black wire: GND to 3Z
external AFR signal: pin 3L added into OEM harness, MRE_02 work-around: blue wire: top 3L to bottom 2O
MRE_02 work-around - 4H removed
Re: MREAdapter72 pnp Miata MX5 NB2
Posted: Tue Jul 07, 2020 6:11 pm
by stefanst
What pin on the main connector are we adding the Pull-down resistor (as seen in the pictures) to and what it the pulldown resistance?
// by the way NB2 MAF internal diameter is about 2.5 inches / 63mm
// 1K pull-down to read current from this MAF
engineConfiguration->mafAdcChannel = EFI_ADC_6; // PA6 W46 <> W46
1k pull-down is added to the MAF signal pin
At some point @mck1117 was planning to look into OEM ECU schematics but I am not sure what was the outcome.
At some point @mck1117 was planning to look into OEM ECU schematics but I am not sure what was the outcome.
I traced out the OEM ECU, and didn't come up with anything interesting. They just had a 1k pulldown to ground, RC low pass filter, clamp diodes, then a buffer. Exactly the same circuit that we run on all of our ECUs.
