rusefi.com

correct, still don't know the actual root cause, just breadcrumbs of symptoms with comparison to good board

the startup time difference is solved by soldering sb10 on disco board bottom:

https://rusefi.com/forum/viewtopic.php?f=4&t=2747

image.png from discussion on discord: 5vp does not light up with just 12v below a certain battery voltage, causing a no-start condition this was traced down to a severe enough drop at the main 5v regulator that would cause the main MCU to power down, aborting enabling 5vp, entering a loop. fix is r...

Howdy all. I have a DIY rusefi ECU based on 407-Discovery board, and I noticed it was taking 2+ seconds to boot up before it started to try to sync/perform engine management actions. after looking around, the solution is to solder SB10 solder bridge at the bottom of the board in the st-link area. no...

more mounting suggestions:

carrier board in a stock ECU case
able to close the cover:

pins into UAEFI molex connectors at almost straight angles:


for molex spacing, 3 pin connectors with middle pin removed:

it's not, that's just a way to generate a +5v signal for coils using this kind of driver and using "inverted" ignition setting. that part works fine, and it works fine once it's initialized. this is how old megasquirt1/2 would set up smart coil ignition from the front LED that were driven ...

i'm using a low-side driver to drive the coils, uln2803a IC to pull down 5v low. ignition is in "inverted" mode in ignition setup. so the startup time impacts that portion of the init sequence in this video: https://www.youtube.com/watch?v=-EUrvMpdcLA the LED array on the left is ignition ...

hmm, perhaps once i get better gate drivers for the ignition setup on there that doesn't need to start inverted.

the pinout isn't quite the same between these two setups, so maybe disco firmware on uaefi could work if i set just a basic proof of life sign up.

kind of comparing apple to rotten potatoes here, but would be neat to have a reason for why delay after 12v is applied is different on UAEFI compared to basically same 407 disco setup: UAEFI startup sequence, 4 super bright LEDS are stepper motor coils https://rusefi.com/online/view.php?msq=1623 htt...

oil pump must not care then which way it's spinning., or it's splash-lubricated.

hmmm, yes, falling edge cyl1 into cam signal with VVT tracking, interesting. i'll get the other patch harness ready i guess and test this on the bench

@AndreyB - perhaps the part of the code that tracks the current VVT offset could be used with a magnetic pickup on cyl1 to attempt to capture the drift of a particular ECU at a certain RPM, using an extra patch harness.

would be pretty trivial to do for me, another patch through harness between the ecu and engine with sniffer device

maybe we can connect timing light's inductive pickup to VR input to capture what the timing light sees ?

also, taking this a bit further, since that just basically becomes and automotive signal sniffer/analyzer. you could use this to force an OEM ECU to give up its secrets. take in cyl1 for timing (or all of them, why not) - timing map take in inj1 for timing AND pulse width (of all of them, why not) -...

can’t measure it - can’t fix it. i’ll try taking a video with a different camera (d800) and lens to make it a bit clearer, something i can control aperture on. maybe we can rig up an f407 disco, or a secondary uaefi to be a watchdog, where hall3 input is cyl1 ignition. perhaps with knowing the advan...

image.png image.png the setup is the same, ignition advance locked at 15 degrees. iphone on a tripod, pointed at the intake cam sprocket. actual advance values don't matter much, we're looking for how much timing jumps around when engine accelerates/decelerates from bottom left, clockwise: MS3PRO P...

RPM updates once per engine cycle, unless the option "always use instant RPM" is selected in the experimental settings. I've endurance raced on that setting so it's probably fine to use. MAP updates once per cylinder, since it averages pressure over an angle window (configurable with the ...

awesome ! thank you !

hmmm, so RPM, MAP, AFR, BATV, PW, IGNTIMING here's what happens when there's a stairstep like that, more vague images coming: this CHUNK of data; don't worry what the actual values are, shape is more important: image.png in MLV, that produces a MAP TRAIL, that is overlayed on the VE map: image.png t...

from the logs, i'm seeing RPM "stairstep" 50ms between updates, TPS is much smoother, MAP is 10ms between updates.

WHITE line is RPM
RED is MAP
GREEN is TPS

log resolution seems to be around 5ms, which is how often the green line seems to be changing.

is that expected ?

It's alive and runs and idles: like 2nd or 3rd startup: headphone warning on all of these. https://youtu.be/ySHCzs3spFg https://youtu.be/id7PRcgcvQA idle short https://youtube.com/shorts/Xxg6QUtrjys rev and back to idle from the engine bay: https://youtu.be/3oy5nil6sjY tune is here: https://rusefi.c...

add e9-28 as a ground. seems to be a dedicated ground for the maf that’s not listed in any of the lists

position sensor grounds are all tied together. so type should be same for all 3 grounds. image.png for stepper valve, indicate which coil is which: 32 + 34 = IAC_coil1 33 + 35 = IAC_coil2 image.png 47 + 48 are oxygen sensors, they are def used not totally sure which one is which on the harness. imag...

I found this channel with some fairly old videos that are packed with a whole lot of knowledge on MegaLogViewer usage and tuning (mostly megasquirt) EFI systems: Using historgram and table generator: https://www.youtube.com/watch?v=N7zqmWfblxg&t=1s This one helped me lots to fix my hunting idle:...

the only reason i even brought up 1uz-fe engines is cause for a few years, probably while partsbin was real hot, there was a shared ECU, probably before VVTI was bolted onto the V8s. the connector is really the main thing i was after even looking at the V8. i don't think there's very many desireable...

there are 3 plugs total. 2 are paired connected with a bolt between them


this is the 40 pin - IGNSW- pin 1 is being held

this is the 80 pin - pin4, ground is being held:

this is how they go in:

the pinout link is accurate.

this is what multispark looks like on logic analyzer:

1 5 3 6 2 4 firing order


D1 = 36-2 wheel
D2 - D7 = cyl1-6 ign

maximum 3 extra spark
this is about 1000 rpm, main dwell is 4.2ms

(right click -> open image in new tab, to actually see wtf)

there was a question about A under the 40 pin connector and whether there's a B, out of this pile, top to bottom USDM 2jz-gte 6MT supra = A JDM 2jz-gte Aristo ?? trans = B diyautotune ms3pro pnp = A AEM EMS v2 supra = A img_4256-ecu-pile.jpg only the JDM ECU seems to be B, no difference between them...

couple more that nobody asked for, but as i'm testing things for melting, i took a video: 250-ish rpm, cranking mode, 6 cylinder sequential ignition, and injection, but injection is simultaneous while cranking: https://www.youtube.com/shorts/v0IeTYYb0yA and 700-ish rpm running mode, sequential ignit...

lets call this: 2JZ-GTE-NON-VVTI 2jz-gte-pinout.pdf what's the software to make the interactive pinout ? additions to that: 80 pin - 28 = MAF 80 pin - 47 = o2 #2 40 pin = 16 - tach out idle = 32 + 34 = coil 1 idle = 33 + 35 = coil 2 plug names image.png 80 pin: jza80-80pin.jpg 40 pin: jza80-40pin.jpg