Search found 68 matches

by blundar
Mon Oct 19, 2020 5:08 pm
Forum: Software
Topic: How do we tune V engines - how many WBO sensors?
Replies: 6
Views: 253

Re: How do we tune V engines - how many WBO sensors?

^^^ what he said. Additionally, it's fairly easy to check if cylinders are assigned to the wrong sensor. 1. in closed loop, make a significant but non-life threatening change to the fueling on a cylinder (10-20%) 2. Observe which sensor(s) see the AFR deflection 3. Rinse, repeat #1 and #2 until all ...
by blundar
Sun Sep 27, 2020 10:45 pm
Forum: Hardware
Topic: Soldering tricks & hints
Replies: 32
Views: 12332

Re: Soldering tricks & hints

Andrey asked me to explain what I'm using for desoldering ECU connectors off OEM ECUs. I have two tools that I use for this. One is a small wave solder machine / solder pot. It's a medium size (~100kg reservoir, ~3000W, ~150kg total machine weight) solder pot. It heats a reservoir of solder to melti...
by blundar
Sun Sep 06, 2020 3:01 am
Forum: Hello World
Topic: AFR target table
Replies: 15
Views: 1084

Re: AFR target table

I would completely make use of the PE vs. non-PE modes on my RB20DET skyline because it's so easy to make boost at low throttle angles going up a hill.
by blundar
Sun Sep 06, 2020 3:00 am
Forum: Hello World
Topic: AFR target table
Replies: 15
Views: 1084

Re: AFR target table

For cable throttle: 1. VE table for airflow and just airflow. 2. Pressure vs. maximum lambda (leanest allowable commanded) Why? So you don't end up at 1.1 lam @ 220kpa @ 3000 RPM on a small-turbo car 3. TPS vs RPM for power enrichment mode enable 4a. Power enrichment: RPM vs target lambda table, pre...
by blundar
Mon Aug 31, 2020 1:38 pm
Forum: Hello World
Topic: AFR target table
Replies: 15
Views: 1084

Re: AFR target table

I think this way of handling fuel (driver demand based, essentially) is a great idea. I'd do a similar thing on my skyline as it's entirely possible to get a couple pounds of boost at 3000RPM at 15% throttle going up a hill - and I have no desire to be at .8 there. Being able to modify or otherwise ...
by blundar
Wed Dec 07, 2016 2:21 pm
Forum: Software
Topic: Post cranking goes lean
Replies: 10
Views: 3104

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: 3104

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: 68
Views: 17255

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: 68
Views: 17255

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: 68
Views: 17255

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: 68
Views: 17255

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: 4515

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: 4515

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: 70
Views: 23174

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: 1508

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: 109
Views: 49317

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: 2475

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: 13
Views: 6562

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: 13004

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: 28156

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: 10030

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: 10030

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: 13004

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: 13004

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: 10030

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: 10030

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: 22159

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: 10336

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: 4770

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: 17356

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...