<VV> Production ECMs Re: EFI Info Re: OBD-II for Corvair
FrankCB at aol.com
FrankCB at aol.com
Wed Oct 13 17:25:51 EDT 2010
Mark,
For you guys using ECMs from production vehicles, how do you go about
CHANGING A/F ratios and ignition timing from the stock NON-Corvair settings to
fit what's needed in your Corvair, especially if you've made modifications
to the stock Corvair? On the MegaSquirt units you can take advantage of the
feedback from wide-band O2 sensors for the A/F and can use Ray Sedman's
SafeGuard with optional display to help you set the timing. Unless, of
course, you simply put the Corvair on the dyno and use the results to change the
MegaSquirt settings you start with. But how do you change factory
settings of production ECM units that are designed to work with NARROW-band O2
sensors that try to run the engine at stoichiometric A/F and timing that is
set for combustion chambers much different from Corvairs??
Frank "old dog trying to learn new tricks" Burkhard
In a message dated 10/11/2010 2:16:14 P.M. Eastern Daylight Time,
62vair at gmail.com writes:
Thanks Frank, its actually Charlie who is the receiver here. I've already
am
about half way through my EFI project. And, I've already been on the DIY
EFI
site quite a bit. Rather than building my own board, I bought a rebuilt
1223370 GM 90-92 Camaro stick ECM and chip for $50. I just finished my
wiring harnesses for the ecm (3 of them) and have acquired most of the
parts. I'm modifying the carbs to straight throttle bodies boring out the
venturi and ecpanding the bore to 1.33", will make a new set of throttle
plates for it. Have all the sensors, etc. Just waiting for bad weather to
bring the car inside (I still want to drive it on sunny days) and the
conversion will begin!
Mark Durham
On Mon, Oct 11, 2010 at 10:16 AM, <FrankCB at aol.com> wrote:
> Mark,
>
> A good idea to get started with this is to go to www.diyautotune.com
> and click on the "Tech Articles" button to access a number of detailed
(with
> pics) articles. The first is a conversion of a carbureted Chevy V-8 to
> throttle body EFI. Others cover multiport EFI. Whether you use the
> MegaSquirt or go to an EFI from a production car, these articles will
give
> you a lot of insight into what's needed and how to go about it,
> step-by-step.
>
> Incidentally, you can build your MegaSquirt from a kit of parts OR buy
one
> already assembled. If you build it yourself, I recommend getting a
> Illuminated magnifying glass light as well as a temp. controlled
soldering
> iron with a VERY small tip. If you don't have experience soldering micro
> circuit boards, I suggest buying the already assembled unit.
>
> Frank Burkhard
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