coldfire

iTrader: (1)

i've been reading up all i can find about the MegaSquirt, as i am really interested in using it for an EMS because of the open source DIY aspect, and the fact that it is so cheap.

now i'm just wondering what people are using for a wideband oxygen sensor for AFR display/datalogging.

- do you need to buy/make a seperate aftermarket wideband controller?
- can the MS directly read a wideband sensor?

and also what is the extent of the wideband signal functionality in the MS software/firmware? it would be interesting if someone has tried implenting something like fixed-AFR ratio mode for cruising, where the MS would maintain a specified AFR (kind of like closed-loop mode on the stock ECU)...

thanks

pmrobert

The MSNS-Extra code variant for the MS-I processor has such functionality, image of tuning software screen below (and tons more stuff, see http://megasquirt.sourceforge.net/extra/ ). The base MS-II processor/codebase ( http://www.msefi.com/msinfo/ms2/ ) also does AFR mapping but does not offer nearly the variety of extras the Extra code does but has more future potential due to the processor being quite a bit more powerful (more inputs, timers, RAM, speed, CAN interface in nect shipment, etc) then the -I and the source being written in C as opposed to asm. It is thought that the C codebase will be more comprehensible to more users/contributors.

Also, it is not able to use or derive data from just a wideband sensor - you need to supply a signal from just about any WB sensor controller - Innovate and wbo2.com make very acceptable devices.

-Mike

coldfire

iTrader: (1)

ok, thanks for the reply, that helps a lot

yeah, it's interesting to see that the "Extra" is only offered currently for the MS-I.
do most people with the MS-II use a seperate controller with datalogging or is the included functionality enough for tuning?

so i can just get the techedge basic kit without any of their datalogging?
i'm basically just wondering if the MS will datalog the O2 signal.

- Aaron

pmrobert

The MS-II definitely will log all you need. I've been doing so since 11/04. It's capabilities are a superset of the MS-I base code. I would think that most, if not all and then some, of the Extra capabilities will appear in MS-II compatible open source code.

-Mike

coldfire

iTrader: (1)

so if i am looking to purchase a kit at this point, the MS-II V3 board would be the one to go with? makes sense to me, i always assume newer is better in the electronics world.

i'm really liking the MS more and more. i really don't mind assembling it, after all i am in school for computer engineering.

there are still a lot of things about it i don't know though, like timing. i guess i'll just ask the questions in this thread...

i have heard that the MS can now control timing for a 13b, however what is the extent of this?
does it just control overall timing, or can you adjust the split on the ignition map?

edit:
is anyone using the zeitronix ZT-2 with a MS?
http://www.zeitronix.com/Products/zt2/zt2.htm

it's just slightly more expensive (like $10) than getting the wbo2.com DIY kit, but you don't have to build it yourself and it even comes with it's own software datalogger...

muythaibxr

Right now I'm working out the final bugs in trailing ignition for rotary. Leading only works perfectly though.

The way trailing is now, it has a 6x6 table for split, and split is specified as degrees after leading.

I hope to have the remaining bugs fixed in the next few days.

For the O2 controller, you can get an Innovate LC-2 with a sensor for $200, that should be cheaper than the ZT-2....

coldfire

iTrader: (1)

thanks a lot muythaibxr.
i didn't realize that you could by the innovate controller seperately, that definetly looks like a good deal.

other than the info given on some of the MS sites, are there any threads, either here or somewhere else, that have updates or discussion on the rotary ignition functionality development?

thanks
- Aaron

muythaibxr

there are a few threads here at rx7club, but the most up-to-date one is here:

http://www.msefi.com/viewtopic.php?p=63884#63884

coldfire

iTrader: (1)

hmmm, i'm glad to see my negative split discussion i started on the rotary performance forum has carried its way into a discussion on implementation...

anyways, thanks for the link.

another question: are you writing this functionality for just MS-I, or if i buy the new MS-II V3 can i still implement what you are working on here?

- Aaron

muythaibxr

I'm only working on it for MS1 right now as I don't have an MS2, and I don't think they're for sale yet..... still waiting for them to get back in stock.

Once I have an ms2 and get everything working the way I like it on MS1, I'll start porting everything to ms2... it's an assembly to C port, so it's not something that can be done quickly.