<VV> Fwd: Old EFI system on a Corvair

[ScottyGrover at aol.com]

I've seen Milt Binyon's rig, talked to him about it; it used a 280Z's  
system; that setup was purely analog, no microcontroller to program; the mass  
air flow meter was a Bosch facsimile, which could be adjusted for various CFM 
 airflows to match the size of the engine.  I built a system of my own  
design on breadboards and ran it on a neighbor's 280Z, it worked as well as the 
 factory original but there was so much hardware that I didn't think it 
would be  worth my time to build it as made; I wound up converting the 
system--at least  the digital part--to a PIC program and using the PIC's 
analog-to-digital  converter to model the analog part.  If anyone wants a look I'll be 
glad to  send the program, understanding that I used Chuck Hellebuyck's OEM 
breadboard  for the hardware; it wasn't expensive then.  
 
Scotty from Hollyweird
 
 
  
____________________________________
 From: bryan at skiblack.com
To: shortle556 at earthlink.net
CC:  virtualvairs at corvair.org
Sent: 10/13/2010 6:51:23 P.M. Pacific Daylight  Time
Subj: Re: <VV> Old EFI system on a Corvair


The originator of this swap was Milton Binion - pretty sure  it was a 280Z, 
not a 260.  He wrote a quite involved piece for the  Communique, which I 
believe was put into the Tech Guide.  Milton wrote  several other tips that 
were put in the Tech Guide as well.

One of our  club members here did the conversion to one of his cars, and 
got parts and  advice from Milton.  Jeff did very good work and the install 
looked and  started very nicely, but the engine really didn't run right at 
speed.  He  and I discussed it at length, IMHO the Z system was poorly suited 
for a  Corvair since the engine characteristics were wildly different - 
compare the  torque curves even casually and you'll see what I mean.  The Datsun  
engine is tuned to a much higher power peak and the curve is quite a bit  
peakier, the cam profile and the bore/stroke is different.

The Fiero  conversion that Craig Nicol did, OTOH, is a much better match, 
the GM 2.8 V-s  has a very similar power curve to a Corvair, the cam profile 
is very close to  the same, and so is the bore/stroke ratio.  Craig's 
results sound really  good.

--Bryan