Questions about our design

[Jason Borkowsky]

	A very small group of true hotrodders (ie: 2 people) are starting
to construct a batch fuel injection system for a 350 Olds dual exhaust
engine, and we have a few specific questions we'd like to ask about our
project:

1. Since the car is dual exhaust, is there ANY advantage to using dual
   oxygen sensors? (If we were to use two, we would just alternate
   reading each sensor, as opposed to reading each sensor every cycle
   and taking an average).

2. Timing control. Have other DIY implemented this in a fuel control
   system? We want to, and our choices of doing it thus far are a
   DIS ignition system (bit more expensive and complicated) or the
   MSD timing control method (Hook a transistor and capacitor across
   the coil, store the energy intended for the coil in the capacitor,
   and then release the energy into the coil after a certain delay.
   This is an oversimplistic view of how it works, but is the basics
   of it).

3. We are also interested in the HIP9010 knock sensor controller.
   How can we get info on it and is anybody planning group purchasing
   of these chips?

4. How heavily can we depend on the oxygen sensor? Originally we were
   planning to use the oxygen sensor as our main source in determining
   the fuel needs (along with references to a MAF and MAP sensor), but
   it seems this may not be such a great idea. Any comments?

5. Inlet air temperature: Do we need one, or will the combination of
   oxygen sensor and MAF sensor be enough to take care of air temp
   differences? (The underlying idea we are trying to achieve is
   simplicity, yet cutting edge).

6. All along we have been assuming that a MAF sensor would be easier
   to use as opposed to speed density. Before we totally commit
   ourselves to MAF, does anybody have any convincing arguments as
   to why we should consider speed density?

7. We are gravitating towards either using the 68HC11 or 68HC16 as the
   microcontroller for our system. I know this might seem to processor
   war inducing question, but we just want an opinion if there is any
   reason we should use the 68HC16 or would the 68HC11 be fine? (Our
   system inputs are basically coolant temp, MAF, MAP, oxygen sensor, RPM,
   timing, and possibly a knock sensor. And as stated, the output will
   be a batch injection system).

8. Does a home brew system need an IAC, or is this really used for
   stringent emission control? (As I said, we want SIMPLE!).

	We appreciate any comments. (Also, I might add, we are going to
use a pre-constructed 68HC11/68HC16 board to add even more simplicity).

						Bob

I6 - the quickest way to the future

(ravalent at liii.com)


						Jason

Matter cannot be created or destroyed, nor can it be returned without a
receipt

(jcborkow at ece.rutgers.edu)
(jcborkow at eden.rutgers.edu)