Search found 63 matches

by blundar
Wed Dec 07, 2016 2:21 pm
Forum: Software
Topic: Post cranking goes lean
Replies: 10
Views: 1826

Re: Post cranking goes lean

My bad... I misunderstood at first reading. There are typically two enrichments: 1. long term CLT vs. enrichment (I described previously, not what was being discussed) 2. short term "post startup" enrichment immediately after crank (what the topic was, I missed it first go) #2 is implemented in seve...
by blundar
Tue Dec 06, 2016 4:18 am
Forum: Software
Topic: Post cranking goes lean
Replies: 10
Views: 1826

Re: Post cranking goes lean

Post startup enrichment is pretty common...

extra% vs CLT is very simple. works fine.

Some systems adjust the target lambda / eq mix. Some add %. As long as you're not trying to pass emissions you can be very crude.
by blundar
Thu Dec 10, 2015 3:04 am
Forum: Software
Topic: CAN support
Replies: 58
Views: 8563

Re: CAN support

A friend of mine worked on a J2534 interface using a STM32F103. He got most of the way done with it. Is your friend planning to release this as a $49 product or open design by any chance? Is he doing smth for himself or a commercial product? My friend is intending to release it as a commercial prod...
by blundar
Thu Dec 10, 2015 3:00 am
Forum: Software
Topic: CAN support
Replies: 58
Views: 8563

Re: CAN support

And in case it wasn't clear from the last post... 95 or 99% working doesn't cut it for a J interface. Many computers can cost $500-1000 to replace if you fuck them up. Bricking computers while programming is extremely undesirable. A lot of what you're paying for with the more expensive J interfaces ...
by blundar
Thu Dec 10, 2015 2:56 am
Forum: Software
Topic: CAN support
Replies: 58
Views: 8563

Re: CAN support

And $250 is CHEAP for a J interface! My MyCanic was about $800 when I got it and the CarDAQ plus my buddy has was close to $1600 new) I guess that's the part which I am failing to comprehend. How comes there is no such thing as a $49 open hardware/open source J2534? well... There is a lot of nitty ...
by blundar
Wed Dec 09, 2015 4:35 am
Forum: Software
Topic: CAN support
Replies: 58
Views: 8563

Re: CAN support

Andrey, you're making this too hard. CAN is just like ethernet or USB (well not JUST like) - it's a transport mechanism. It's almost as inconsequential as TCP/IP is for delivering movies with Netflix. It's a means to an end, that's all. There are some standards and conventions, but no magic. The hig...
by blundar
Fri Nov 06, 2015 2:35 am
Forum: Your car & your engine
Topic: 3S-FE soon to be 3S-GTE 1995 Rav4 2door
Replies: 14
Views: 2983

Re: 3S-FE soon to be 3S-GTE 1995 Rav4 2door

and toyota vr sensors tend to age poorly and are very finicky to deal with. specifically very low voltage output at low rpm while cranking.
by blundar
Fri Nov 06, 2015 2:34 am
Forum: Your car & your engine
Topic: 3S-FE soon to be 3S-GTE 1995 Rav4 2door
Replies: 14
Views: 2983

Re: 3S-FE soon to be 3S-GTE 1995 Rav4 2door

12 evenly spaced teeth on crank wheel
1 tooth on cam sensor
mag (VR) sensors
by blundar
Tue Dec 23, 2014 5:27 am
Forum: Hardware
Topic: Ignition modules
Replies: 69
Views: 15650

Re: Ignition modules

Why are you making things so hard? Denso "pencil" coils come in all shapes and sizes with 3 or 4 pin connectors. Toyota uses them. Honda uses them. Nissan uses them. Mitsufeces uses them. Subaru use them. They support ~150-200hp/cylinder with a 0.020" spark gap and a copper plug or 0.018" spark gap ...
by blundar
Tue Dec 23, 2014 5:15 am
Forum: Software
Topic: Powershifting?
Replies: 3
Views: 1021

Re: Powershifting?

The "semi-proper" thing to do is put a strain gauge on the shifter. Many higher-end sequential transmissions actually require this. The idea is that the strain gauge picks up force on the shifter, momentarily kills power from the engine (usually kills spark) and allows the shift to happen without fu...
by blundar
Sun Dec 21, 2014 4:24 pm
Forum: Your car & your engine
Topic: 2003 Dodge Neon (#9)
Replies: 108
Views: 27382

Re: 2003 Dodge Neon (#9)

That's pretty cool. We'll make a tuner out of you eventually, Andrey. Maybe. :)
by blundar
Fri Dec 05, 2014 6:54 pm
Forum: Misc
Topic: LS swap: rusEfi as a piggyback?
Replies: 5
Views: 1765

Re: LS swap: rusEfi as a piggyback?

Trans control is something we have not yet gotten into. I'm a thumbs up from a hardware support side of it. Do you have a schematic of either side of this transmission? Either something that shows the car side and what's connected to it, or even better would be something that shows the internals. H...
by blundar
Fri Dec 05, 2014 6:46 pm
Forum: Software
Topic: 101 on Matlab/Simulink
Replies: 11
Views: 1924

Re: 101 on Matlab/Simulink

This gets down to architecture. Implicit in a lot of what you are doing is a model. Many ECUs use incredibly simple models. Many use incredibly complex ones, sometimes unnecessarily so. Most of the time this ISN'T something that end users or people tuning ECUs think about in the forefront of their m...
by blundar
Fri Dec 05, 2014 6:28 pm
Forum: Software
Topic: FSIO: GPIO implementation
Replies: 37
Views: 9582

Re: FSIO: GPIO implementation

possibly. VCT is often more subtly complex. It's an example of where you typically need closed loop systems (PID) to achieve and maintain targets. remember the "classic" structure: 1. table(s) to generate targets 2. open loop table(s) to establish baseline 3. PID closedloop actions to steer to targe...
by blundar
Thu Jul 17, 2014 2:35 pm
Forum: Your car & your engine
Topic: 1995 Honda Accord - auto, vtec (#5)
Replies: 46
Views: 23789

Re: 1995 Honda Accord - auto, vtec

Honda's injector supplier (Keihin) didn't have a saturated injector when this was made. Or they had a ton of the older P+H injectors left in inventory. In any case, the resistor box on the injectors serves as a current limiting job to allow the injector drivers (NPN Darlington arrays, 2 inj per arra...
by blundar
Tue Jul 15, 2014 9:01 pm
Forum: Misc
Topic: new test mule suggestions?
Replies: 32
Views: 7311

Re: new test mule suggestions?

If you go with a Honda, stick to manual trans. IMO.
by blundar
Tue Jul 15, 2014 9:00 pm
Forum: Misc
Topic: new test mule suggestions?
Replies: 32
Views: 7311

Re: new test mule suggestions?

i don't know that much about Honda V6. They're not very popular with the enthusiast community, at least not until later engines.

92-98 have separate TCM for integra, Accord, Prelude
92-00 Civic (simpler trans) are integrated into ECM.
01+ pretty sure all the TCMs are integrated onto the ECM.
by blundar
Thu Jul 10, 2014 3:49 am
Forum: Software
Topic: FSIO: GPIO implementation
Replies: 37
Views: 9582

Re: GPIO implementation

remember in our discussion the suggestion of "dma" inputs and "dma" outputs? -Hardware inputs moved into variables -Hardware outputs set from state of variables -Control logic in middle simply manipulates variables How does this work on a practical level? unsigned char ECT_ADC; //8bit ADC value for ...
by blundar
Wed Jul 09, 2014 3:13 am
Forum: Software
Topic: FSIO: GPIO implementation
Replies: 37
Views: 9582

FSIO: GPIO implementation

Rather than keep implementing specific functions (i.e. fan control) it seems like it would be a good idea to implement general purpose condition driven I/O. This is done on many other systems and is a great way to implement features in a generic way so that the same code instance can be called with ...
by blundar
Wed Jul 09, 2014 12:48 am
Forum: Misc
Topic: new test mule suggestions?
Replies: 32
Views: 7311

Re: new test mule suggestions?

Saab have a small but loyal following. They do a lot of weird stuff. One of the few to use ion sensing in a production vehicle. Not sure how I'd feel about going after that. Same deal with Volvo... Small but loyal. Much like Saab, extremely small group of enthusiasts doing mods that would require a ...
by blundar
Tue Jul 08, 2014 6:05 pm
Forum: Misc
Topic: new test mule suggestions?
Replies: 32
Views: 7311

Re: new test mule suggestions?

Suggestions: 1. Miata. Huge community, relatively large installed base, decent support from Megasquirt already, fledgling ROM tuning stuffs starting to trickle into existence 2. VW gasoline. Think VR6, 20V 1.8T, pre-GDI stuff. Decent size community where at least ok drivetrains have stunted performa...
by blundar
Sat Jun 14, 2014 10:01 pm
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16103

Re: MAP but not SD as intermediate solution?

If you want a walkthrough/comparison of some common engine management systems and their (subjective) pluses and minuses, hit me up. I have (literally) hundreds if not thousands of datalogs and tunes from various real vehicles. Sometimes it's really handy to see some of the data analysis / mechanics ...
by blundar
Sat Jun 14, 2014 9:49 pm
Forum: Hardware
Topic: Ignition and Ignition modules
Replies: 28
Views: 8004

Re: Ignition and Ignition modules

There are several coils that I use on just about everything that have built-in ignitors and can be driven at logic level: 1. Denso coil sticks. 01+ Honda K/J/D series, Toyota 1zz/2zz, ... ... Very common well-constructed coil made by denso. Typically happy between 2.5 and 3.5ms of dwell depending on...
by blundar
Tue Apr 22, 2014 3:16 am
Forum: Hardware
Topic: Digital/discrete inputs - Sudo
Replies: 13
Views: 3454

Re: Digital/discrete inputs - Sudo

Might as well add some spark gaps... They're handy as a first line of defense.

.lbr isn't an allowed extension so I can't upload the library of cookie-cutter spark gaps I use. I can email you my eagle library if you want, but I don't do kicad yet.
by blundar
Tue Apr 15, 2014 4:47 am
Forum: Hardware
Topic: CAN module - SN65HVD230
Replies: 25
Views: 14566

Re: CAN module - SN65HVD230

Dude, your information is wrong. OSHPark manufactures all their PCBs here in the US. They may use some packaging made in China, but the PCBs are all USA. The guy that runs it is a huge proponent of open source hardware and developing manufacturing here in the US. Double check before spouting off nex...
by blundar
Tue Mar 25, 2014 6:07 am
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16103

Re: MAP but not SD as intermediate solution?

While I respect what Honda's programmers were able to accomplish (an ECU that would run an engine comfortably to 10,000 RPM in 1992 with a 10Mhz MCU and a well-designed ASIC), hardware is now cheap. The only conceivable motivation for doing pulsewidth or reqfuel lookups directly off RPM and MAP is s...
by blundar
Tue Mar 25, 2014 5:59 am
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16103

Re: MAP but not SD as intermediate solution?

I've spent hundreds of hours doing disassembly on 88-05 Honda systems. I did some quick looksies on my 85 CRX. I know that there was stuff before it but the PGMFI system that grew out of their F1 efforts is what I've sunk my teeth into and can speak more about. :mrgreen: You can most definitely tell...
by blundar
Tue Mar 25, 2014 5:52 am
Forum: Hardware
Topic: stimulator board
Replies: 182
Views: 38766

Re: stimulator board

I've had to tackle the issue of VR sensor simulation for a commercial product that I helped design. Before you get too brainiac about this, it pays to examine what the "detector" circuitry is inside the ECU. In almost all cases, VR sensor interfaces boil down to zero-crossing detectors that trigger ...
by blundar
Tue Mar 25, 2014 5:11 am
Forum: Software
Topic: MAP but not SD as intermediate solution?
Replies: 69
Views: 16103

Re: MAP but not SD as intermediate solution?

This is basically how early Honda (~1988-2005) systems worked. It's kind of ghetto IMHO. These MCUs were typically 8 - 16mhz and lacked FPUs. Having worked with more modern algorithms that divorce fueling from airflow (i.e. semi-proper SD, MAF, SD-MAF mix, AlphaN-SD-MAF mix, MAP-compensated Alpha-N,...
by blundar
Sat Mar 08, 2014 3:14 am
Forum: Misc
Topic: Crowdfunding? Thoughts?
Replies: 18
Views: 7529

Re: Crowdfunding? Thoughts?

IMHO, I would wait. Kickstarter IMHO is most useful for advertising. It's useful for taking something that is ALMOST a product and reaching a much broader audience with it than would be possible otherwise without a HUGE advertising budget. Coupled with a social media campaign and maybe some targeted...