Re: [Amc-list] EFI install on [anything modest]

[Wrambler242@xxxxxxxxxxx]

Not sure this is exactly the same, but Dino over on the strokers group is in Saudi Arabia. He has an exprot 90's XJ. It runs off of MAP,coolant, etc; no O2 sensor on it at all. 
  I would imagine the ecu from it would allow running even leaded fuels without too much problem. He uses a map voltage adjuster and some other tricks to alter the fuel curve to go with its stroker and 24 lb Ford injectors.

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5

 -------------- Original message ----------------------
From: adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)
> " From: Tom Jennings <tomj@xxxxxxx>
> " 
> " On Mon, 2 Apr 2007, Sandwich Maker wrote:
> " 
> " > " From: Tom Jennings <tomj@xxxxxxx>
> " > "
> " > " The only thing I've read "bad" about Howell and others is from
> " > " people who tried to set them up without enough sensor feedback,
> " > " "open loop", and feedback is the whole POINT of FI. Except for
> " > " those few, I've not heard a bad thing about Howell.
> " >
> " > i disagree about feedback.  it's the only practical way to zero in on
> " > perfect mixture under widely and wildly changing conditions, but i've
> " > always thought that to a degree it was a crutch for systems that
> " > didn't have the proper sensors to read the environment going in.
> " 
> " I was specifically referring to non-OEMs adding EFI to an
> " engine that's either older, modified, rebuilt, customized,
> " or otherwise not-factory-unit-to-unit consistent.
> " 
> " Saab designed a limited feedback FI system for some particular
> " engine coming off an assembly line with probably good consistency
> " unit to unit. That's not what hobbyists are doing.
> 
> agreed, though saab didn't design this system - it was the original
> bosch jetronic first seen on the '66 vw squareback.  afaik it had -no-
> feedback.
> 
> " Isn't it funny though, that a carb basically has one "sensor",
> " an air-velocity/partially-mass measuring device aka venturi, and
> " with that one crappy old thing meters gas pretty damn well over
> " a surprising range of variables. (OK power valves etc count.)
> 
> don't forget 'booster' venturii!
> 
> " Carbs are lousy at: engine (coolant) temperature compensation,
> " economy/partial throttle cruise vs. power "modes", and
> " altitude. Chokes and vacuum or progressive-mechanical secondaries
> " pick the low-hanging-fruit of the first two, and there's some
> " 80's carbs that attempt altitude but we don't hear about those
> " any more!
> 
> this is all why a simple open-loop system like the jetronic worked so
> well.  the only thing it couldn't measure was humidity.
> 
> " > this was btw an
> " > analog system, based afaik on bendix patents that may have been on the
> " > '57 rebel system.
> " 
> " It would be very interesting to re-visit those older analog
> " systems with the electronic gunk we have now! Too bad the
> " hardware is all museum quality and availability now. Analog
> " servo stuff is something I'm good at (useless skill).
> 
> analog stuff can take real math skills which i think is why it's
> gotten passed over, but i think it's a shame.  the elegant simplicity
> of it all...
> ________________________________________________________________________
> Andrew Hay                                  the genius nature
> internet rambler                            is to see what all have seen
> adh@xxxxxxxxxxxxxxxxx                       and think what none thought
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