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LLY Ficm
Yeah, I had meant using resistor nets for settings only, not the main I/O. That all needs to be as robust as possible, as you say. Since we have to support at least some CAN messages to make the ECU happy, it might be easy to add some custom messages for debug / development, like holding the... -
LLY Ficm
If you use resistor nets you can combine a bunch of settings onto one ADC pin, saving some inputs. Or since settings don't change real-time, move them to a I²C expander chip which will take only a couple pins and let you read as many as you need. Some of the settings can be detected at startup... -
Changing turbo setup
Hit the last day of the season at Firebird Raceway, and now that the rough edges of the tune are worked out, put down a new personal best: 12.609 @ 111 MPH This was with a full tank of fuel, tow hitch, tools, etc. Probably right at 8,200 lb with me in it. I could launch a bit harder, but...- DAVe3283
- Post #34
- Forum: Turbo Talk
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lb7 throttle sensitivity
I've always tuned it to reduce twitchiness. In my mind, it's easier to plug in a laptop than ness with springs. You're on the right track with your tune, and as was mentioned reducing fuel pressure slightly in the low throttle area will make it less responsive too. Just be careful with fuel...- DAVe3283
- Post #10
- Forum: Duramax Tuning, Logging, and Gauges
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LLY Ficm
If it's going to have a CPU fast enough to monitor everything, why not have it do the 90° delay too? The programming wouldn't be trivial, but it's not insurmountable either. I've done embedded code with similar hard timing requirements before, but it's been a while. Might be fun to take a crack... -
LLY Ficm
That might be possible, but what's the end goal? If the stock ECU already expects a 90° delay, there is no need to make it fire "on time". (Though really what you'd be doing is making it a 360° delay instead of 90°). Even if the plan is to run an aftermarket ECU, all of them support entering a... -
LLY Ficm
The U1000 could just be the ECM not being able to talk to a BCM. Any slight glitch and most GMT800 modules will store a U1000. So much so that if I don't see a U1000 stored somewhere on a vehicle, I assume the batteries have been disconnected or codes cleared very recently. The accelerator... -
September '23 Chat --"Jason finds his truck!"
I'd like to believe someone out there, somewhere, is making good money. Cause it ain't me! Sent from my FlashScan V2 using Tapatalk- DAVe3283
- Post #70
- Forum: Smoke Signals
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September '23 Chat --"Jason finds his truck!"
Didn't UPS just reach an agreement with the union to pay their drivers like 2x what I make as an electrical engineer? [emoji14] Sent from my FlashScan V2 using Tapatalk- DAVe3283
- Post #68
- Forum: Smoke Signals
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Battery not charging, service air bag, service brake system, only 800rpms WOT, engine oil life stays at 5%, fuel filter life no longer shown.
That's almost certainly one of the audio ground / drain wires, and I believe that's factory. Older trucks had that wire in a clear plastic sleeve, I'm guessing GM switched to tape to save a few cents. Sent from my FlashScan V2 using Tapatalk -
Roughy idle and zero power
Yeah, you should see MAP match Baro with the truck off (which you do, so the sensor is OK) and with the truck idling (which you don't). Since it's low at idle, something is restricting airflow prior to the intake. Did you take the intercooler tube(s) off and leave a rag in them? I'd disconnect... -
September '23 Chat --"Jason finds his truck!"
The LB7 in my Suburban takes forever for the oil to turn blank. It'll look like you posted after 1000 miles. Nothing weird on the oil sample. And for what it's worth, I also run Delo. I also recommend an oil sample, especially given what all happened to the motor. But if you're not making oil I...- DAVe3283
- Post #47
- Forum: Smoke Signals
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LLY Ficm
Do they only go to the NOR chip? That could be a way for the CPU to monitor if the ECU is trying to fire injectors or not, while they also directly run the FETs. I still think this feels like an amplifier board with too much monitoring and self-diagnostics. Why would GM run 8 wires with the... -
LLY Ficm
The fuel to cool it was always nonsense. I've got 60,000 miles on my FICM running dry in the stock location, and 350k miles (10,000 hours) on it total. Sometimes I think designers and engineers get bit by bureaucracy or just make an honest mistake, and we end up with fuel cooled injector drivers... -
LLY Ficm
I'm partial to the teensy myself, but it isn't rated for the temps we'd need for production units. The ST stuff is pretty good, and I used to do a lot with Microchip but their software stack has become really subpar by today's standards. Sent from my FlashScan V2 using Tapatalk -
02' LB7 Tow Pig Build
Heck, I did the same thing when I built my motor. Doing the cranking to prime the fuel and oil, and my brother yells out STOP! Pumped half a gallon of oil onto the floor out of a gallery plug I forgot to install. Sent from my FlashScan V2 using Tapatalk- DAVe3283
- Post #174
- Forum: Garage Builds