Questions...

[Johnny]

Todd Chisholm wrote:
> 
> Hey all,
> 
> I've got a couple of questions about your group orders.  First, when
> the order is placed, is it just for the PC board, or all the parts?

First of all, the group buy stuff is for the efi332 project... this is
the diy_efi mailing list. Most, if not all of the efi332 members are
also members of this list, but not the other way around. 

So in brief; The group buys are presented by who ever decides to sponsor
one. The web page is a completely automated database now, whatever you
see on there, is what there is. On the buyers page, any buys listed will
show a complete listing of all the parts included in that buy, as put
together by the buy's sponsor. Currently, I think the only thing on
there is one that I am sponsoring for the CPU board (again). There is
another one going on for the IO boards, but it is on the old version of
the page, which is at another URL and will be axed as soon as that buy
is over with. The driver boards are probably going to pick up a sponsor
again soon... as soon as someone gets tired of waiting for more of them
and decides to take the inititive to sponsor a buy for them.

> Is the list of the homepage up to date?  I would like to get a hold
> of the driver board.  There has been a lot of talk about diodes
> lately, and getting a sufficiently short pulse for the injectors.  I
> don't know much about that non-digital electrical stuff.  Am I
> correct in thinking that the driver board simply (!) takes a 5V
> signal from the controller and opens the injector for the length of
> time that the signal stays high?

Well, there are a couple ways to do it. Peak and hold is probably the
most popular (at least with me). With that method, the injector gets a
bigger jolt to get it open fast, and then the current is reduced to hold
it open, and then it is cut to allow it to close. It doesn't have to
work this way though, and what injectors you use can dictate how you
have to drive them, or what you will have to use as a driver.

I'll let the bike specialists take it from here...

> There seems to be some interest in EFI on motorcycles.  A few people
> have mentioned using throttle body instead of multiport.  I am
> curious as to why throttle body would be used.  I assumed that
> multiport would be more efficient.
> 
> My project seems to be taking its first steps.  I scavenged a board
> from a friend based on the 6811 with 8 channel A/D and 8 channel
> digital inputs.  Lots of output stuff.  It was originally for a
> robotics course, but I think that I can twist it to my needs.  I was
> thinking about easing into this slowly, perhaps hooking up a MAF
> sensor to the bike with the original carbs to get a feel for how
> much it is drawing at idle and under power.  Does anyone have an
> idea for what type of MAF sensor would be appropriate?
> 
> Thanks,
> 
> Todd.