[T3] FI brains reinvented?
Jim Adney
jadney at vwtype3.org
Mon Oct 22 09:49:24 PDT 2018
On 21 Oct 2018 at 10:20, Micah Medway wrote:
> I've been musing for a while on the possibility of re-engineering FI brains
> for VWs
They probably could, but it's probably not worth the effort, because the OG
brains have been exceptionally reliable. While there's always interest in
adding adjustability, that can currently be done externally, and most of those
efforts turn out to be misleading or counterproductive anyway.
There's a class of computer-like chips called microcontrollers. I'm sure one
of those could be adapted to replace most of what's in our brains in a
package about the size of a large postage stamp. Of course a "new" brain
would also need power filtering and regulation circuitry much like it already
has, and interface circuitry to drive the injectors, but most everything else
could be done in the ucontroller, which would be reprogrammable.
It could all be done for a few hundred dollars, plus a few thousand hours of
development time. Since you can replace everything with a Megasquirt
system for about $1000, there seems to be very little point in doing this,
since very few people would ever buy it.
Consider this: I spent hours and $$$ developing a $75 relay kit to take
almost all the load off the ignition switch in my '71. That kit would be a
godsend for anyone with a '71, and it's been working well in my '71 for a
couple years. I wrote up detailed instructions and packaged 5 kits, but so far
I've sold exactly one, and it's not been installed yet. It's waiting for the car to
be finished and working in the stock configuration before the kit gets
installed.
I sell lots of the $25-33 gas tank overflow kits, quite a few $11 or $30 fuel
pump primer kits, but $75 seems to be a bit more than most of our owners
are willing to pay for something that seems to be optional, at least at the
moment.
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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