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Sorry for the latency, been super busy working on other cool stuff... https://www.youtube.com/watch?v=IzV_xrisMko Back to things that don't run in a datacenter: Yeah, I've seen how it finds the sync tooth (looks for a tooth between some ratios of a "normal" tooth length). But for the LS se...

location of magical synchronization tooth How does the trigger system determine which tooth is the magical sync tooth? For some trigger patterns (n-m like 60-2) it's an obvious case that the first tooth after the gap is the sync tooth, but what about something like 8-2-2-2 or GM's 24x pattern? PS: ...

russian wrote: ↑

Sat Oct 13, 2018 1:15 pm

Usually trigger synchronization point does not match TDC and most trigger definitions have the trigger offset to accommodate.

Wait, what? Why? That seems like a terrible design. Is there a deterministic way to determine where the synchronization point is?

Reopening the discussion on 24x crank trigger decoding, erm because reasons. I definitely don't have a freshly rebuilt one in my garage, or anything... https://imgur.com/G256F2x.jpg https://imgur.com/ysj8VGd.jpg I rewrote the trigger setup to use the exact values, instead of guessing (though the gue...

Basically you manually control the valve and create a look up table for various position through out the range. Such that with no PID, you would get these positions. Yup, that's what I did! Also do you have a separate idle air control valve? Nope. I don't think I've ever seen an engine that had an ...

And here's a video of the high speed response, cycling between around 20 and 70%. Second half of the video is at 1/10-ish speed.

Ok, I bought a Ford throttle body (read: Bosch) from Ebay, which I believe is for the 3.5 v6 in the Explorer/Mustang/Taurus/etc. The units for other engines appear very similar but are different sizes. Mine has two feedback signals, one that provides full scale output, and one that saturates past 50...

Boost control should just be a normal low-side driver like an injector, relay, etc, plus appropriate software (which doesn't exist but I've thought about implementing for my car). CAN hardware is fully present and functional. I'm close to building a screen that lets you change some parameters on the...

What insane engine do you have that runs 6 bar of boost and doesn't spool the turbo until 4000+ RPM?

Yep, I'm using an MPX4250 only because I harvested it from a Megasquirt!

I'll probably switch at some point to an in-engine bay sensor as I don't like the vacuum line entering the car. More easy failure points.

Abricos wrote: ↑

Mon Jun 18, 2018 10:40 pm

when i disconect LSU 4.2
VM VS/IP to gnd 1.41v

Hmm, should be 2.5v. Have you checked other pins for short to ground?

Abricos wrote: ↑

Mon Jun 18, 2018 10:09 pm

power supply 12.2v
UR to gnd 3.17v
UA to gnd 5.05v

On mine I get:
Ur = 4.92v
Ua = 1.50v

Are you set up for LSU 4.2 or 4.9?

What's the voltage at the "VM VS/IP" pin/wire to the sensor? Should be 2.5v. Measures 2.501v on mine.

it's vice versa. Most of those analog pins are safe to be used with 5V, unless they are used in ADC mode. Oops, I guess I missed the line that said "FT = 5 V tolerant except when in analog mode". I'm not sure why it says that though, because the protection diodes are still active in analo...

Regarding an MAP or MAF, is there one that's particularly well suited? I'll be making a custom intake, so as long as it's relatively compact to fit I wouldn't have a real preference. GM MAP sensors are pretty popular for swaps and such. The ones that look like this are convenient: https://www.wbo2....

I've heard, it requires quite precise and not commonly used resistor, that specifies the sensor version. is that true? The only weird resistor values are the 61.9 ohm shunt resistor, an 82.5 or 200 ohm resistance used for calibrating the temperature sensing circuitry, and a 10k or 31.6k resistor fo...

Use getVoltage instead of getVoltageDivided as I've connected the analog inputs without any division/buffering/etc. Are we allowed to feed UA signal without any division? I thought only UR range is safe for 3.3 ADC? From the cj125 datasheet: https://imgur.com/Xtz98eW.jpg Ur can be as high as 5v, bu...

With no O2 sensor connected, what are the voltages at Ur and Ua (pins 12 and 21 on cj125)?

Great--that looks like it should fix it. That might also help with a few spots where components are so close together that there's no solder mask between two pads. Some quick notes about those clamp meters. I had it on the 2 amp range, and this meter lets you zero it. So I zeroed it in place (clampe...

How does the heater chip handle thermally? Does it get hot? Can you touch it with a thermocouple or similar and tell me the temperature rise above ambient? I don't have any quantitative measurements, but after a spirited ~45 minute drive, the cj125 was slightly warm, and the heater MOSFET was stone...

Time for data. Here's a snip of the log (around 215 seconds, see below for attached log file). https://imgur.com/AMmKoRT.jpg These few seconds were from brake boosting the car in 3rd gear at around 3500 RPM. The width of the part at full boost (~180kpa = 11.5 psi) is 4.1 seconds. The upper panel con...

Oh, and here's how I'm testing the O2 setup. I have two identical Bosch LSU 4.9 sensors screwed in to adjacent bungs in my downpipe. One is connected to my AEM 30-4110 combined controller/gauge. The other is connected to the cj125 board mounted on my Frankenso.

I'm running semi-hacked SPI code. The CJ125 is changing its internal settings and responding properly, but the firmware is still reading the LSB of every response as a zero. As a result it emits some warning messages, but as they're only warnings it all functions totally fine. Something is also stil...

Finally, in the third post of the day, I have a working O2 sensor! Something was up with that board, as I had a short from one of the sensor pins to ground. I isolated it to the o2 sensor board, removed and replaced all the components on that net and even replaced the cj125 chip, but couldn't fix it...

Ok, made some more progress. I commented around all of the SPI stuff that was giving me trouble, and manually calibrated it using my meter, hard coding the calibration constants. Closed loop heater control works properly! https://www.youtube.com/watch?v=adAsApiKjvQ The right gauge is Ur (reference c...

Yeah, Ur is the pump reference output, used to control temperature. Ua is the output of the pump current amplifier, which indicates lambda. The hardware just requires two different value resistors (you're supposed to do it with the jumpers, I just used correct value resistors for 4.9). The more cruc...

I'm catching up to Abricos! I got the heater portion working today, installed on my Frankenso.



It looks like there's presently no software support for LSU 4.9, is that correct? I'm happy to implement it, if it in fact doesn't exist.

Can you start a new thread for no lift shift? How would it know that I am shifting on the track? Excuse my lack of knowledge. The tl;dr is that when the clutch pedal goes in, the ECU cuts fuel/spark so you don't have to lift off the accelerator. Then, when you're off the clutch again it brings them...

There's already support for per-cylinder ignition timing offsets, right? Might this combo work? - Set to 4 cylinder, 2 stroke (90 degrees between cylinders) - Ignition outputs 1/2 go to the 1st rotor, and 3/4 go to second - Set extra ignition advance to 0/80/0/80 for channel 1/2/3/4 respectively. I ...

Forced induction is great fun! So much fun that rusEFI has the power to make my clutch eat itself! And get power oversteer!

Good to hear your making use of it. Is there some code or settings which could be shared? A plain PID controller doesn't do a very great job, at least on my engine. It does fine enough when the response time is short (mid to high RPM, mid to high load), but when there's considerable phase (exhaust ...