68HC11F1 questions

[Frederic Breitwieser]

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Greetings Seth,

Honestly, you are jumping over your head a little bit.  But I won't stop =
you... the reason being learning hands-on is a fantastic experience and =
if you have access to slews of parts (i.e. engine!) as well as the =
electronics, you have nothing to lose, only to gain.

I've been reading "Fuel Injection" by Jeff Hartman ISBM 0-87938-743-2, =
avail from a larger WaldenBooks store or Motorbooks Internation, at =
800-826-6600.  This text will give you a stronger foundation, and does =
lightly discuss the concept of dual injectors in racing applications, =
which is somewhat similar to what you are trying to do... run regular =
injectors for street use, and have a second fuel system (Methonol, =
Alcohol, etc) running in parallel for boost requirements.

BTW, I have everything you have sitting in a box in the corner.. the =
Motorola EV-1 68HC11F1 Evaluation Board, battery backed Ram (using a =
Dallas 64K litium powered static ram chip instead of an eprom <G>), as =
well as eight LM1949 injectors.  Haven't done a thing with it.  I don't =
have the C compiler, however I do have the assembler as published on =
Motorola's website.  Just haven't done anything with it yet.

Seth, I'd like to stay in touch and follow along with your project if =
you don't mind :)

Frederic Breitwieser
Homebrew Automotive Mailing List
http://members.aol.com/fjb203/index.htm

-----Original Message-----
From:	Seth Allen [SMTP:n9540517 at cc.wwu.edu]
Sent:	Friday, April 25, 1997 10:42 PM
To:	diy_efi at coulomb.eng.ohio-state.edu
Subject:	68HC11F1 questions

Okay, I really wanted to write about radar, but instead, I think I will=20
pick something different. I am a student in an engineering technology=20
program, specifically involvin vehicle design.  My background is=20
mechanincal engineering tech. I started a bit of a propane/ methanol=20
sidetrack discussion a while back.=20

My situation is this:  I am thinking of trying, with considerable help,=20
to build a simple efi controller for adding supplementary fuel=20
(methanol)  to my engine during boost.  I am planing simple stuff, batch =

fire, with 4 injectors, a 0-2 bar MAP sensor, and firing the injectors=20
only during boost and varying pulsewidth according to MAP.  I have =
access=20
to free use of a 68HC11F1 board, with the extra battery backed RAM, I=20
have 4 LM1949N injector driver ICs (peak and hold). I have acces to=20
compilers for assembly and C, neither of which I know.  I can program=20
BASIC sort of.  I will have help from professors and students.  Am I=20
jumping in way over my head?

ANy input suggestions, experiences, would be helpful.  Also does anyone=20
know where I can get a 0-2 bar MAP sensor? Cheap? ANd what si the sort =
of=20
output I get from it?  I can put it in a pressure vessel and map the MAP =

sensor, but I dont want to.

Thanks in advance for the replies, hopefully many.

Seth Alen

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