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Re: Super low cost FI?
Posted by: vwbusman66 ()
Date: April 20, 2017 06:35PM

So a traditional 555 is rated for a max output of 200ma.
Can I just use a transistor to increase the output to my required 1a (or less), or must I build a driver to do so?

-------------
James Keller
Kingsville, MD (21087)
Currently Corvair-less but on the hunt

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Re: Super low cost FI?
Posted by: ROD ()
Date: April 20, 2017 07:30PM

If you are still up for ideas :

Solar powered attic fan with wrecking yard parts.....

Hey I always wanted to build a rat trap out of a golf ball cannon so the rat crawls in the tube and next morning I can go outside and shoot him into space or at least the next few houses over.

Rod Tetrault
El Cajon , CA
65 Corsa Yenko Clone / 65 Corsa EO Creampuff Vert
66 Corsa "JIMISH" Mid engine Turbo LS1 currently 2nd fastest Corvair in the USA
Class 5 Corvair powered Baja
61 Vintage Rampy
Corvair powered Buggy x 3
Enough hidden parts to build a space ship

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Re: Super low cost FI?
Posted by: jmaechtlen ()
Date: April 20, 2017 09:04PM

a "driver pack" is a set of amplifiers, one channel per injector.
One of the right transistor per channel might be fine - 5000 rpm is less than 42 squirts per second per cylinder.

Fuel pump, etc - why would you buy new? Any crappy used efi pump that still runs would work fine.
Ditto the rest - get one or two used injectors off of a small 4-banger at the salvage yard. Probably too big, but good enough.

etc...

Jay Maechtlen
El Monte, Ca
Yes, it started out in life as a 61 2door.
It has a custom fiberglass skin, and a transverse 3.8 Buick.


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Re: Super low cost FI?
Posted by: DAVECS1 ()
Date: April 21, 2017 05:38AM

If you can re-create Ted's system, that in itself would be a huge learning experience. Ted did not build anything new per say. He took a good selection of what was already available from mother GM and reconfigured it to work for his situation. The big parts like the throttle body and ecm, and ignition all exist in a thousand different forms and brands, many of them done well. The amazing pieces of engineering in Teds system are not the big things, but the stuff that goes unnoticed, in the harnessing, fuel system plumbing, and bracketing. Last but not least he was able to reprogram probably the least expensive most capable efi ecm to date to make it work for the corvair.

You could build Teds system for 300 dollars all day long. If you can just manage that you will have learned a great deal. EFI is not cheap, cause even if the parts are cheap, there is expense in learning the stuff to make it work.

1964 Monza Convertible
110 4 speed
Peoria, IL




Edited 1 time(s). Last edit at 04/21/2017 05:39AM by DAVECS1.

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Re: Super low cost FI?
Posted by: DAVECS1 ()
Date: April 21, 2017 05:39AM

Double post

1964 Monza Convertible
110 4 speed
Peoria, IL




Edited 1 time(s). Last edit at 04/21/2017 05:40AM by DAVECS1.

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Re: Super low cost FI?
Posted by: cnicol ()
Date: April 21, 2017 06:15AM

Another example of repurposed GM hardware. The magic here was to select a donor with the same engine specs as a Corvair so no programming required. Built in '99, the car still runs like a charm today... and it was a huge learning experience when I built it.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: Super low cost FI?
Posted by: Chilly Willy ()
Date: April 21, 2017 06:30AM

cnicol Wrote:
-------------------------------------------------------
> Another example of repurposed GM hardware. The
> magic here was to select a donor with the same
> engine specs as a Corvair so no programming
> required. Built in '99, the car still runs like a
> charm today... and it was a huge learning
> experience when I built it.

Nice and clean.looks like it belongs there 😎



Will
Northern California

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Re: Super low cost FI?
Posted by: vwbusman66 ()
Date: April 21, 2017 08:10AM

I had also thought about adapting a newer gm system to work...

-------------
James Keller
Kingsville, MD (21087)
Currently Corvair-less but on the hunt

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Re: Super low cost FI?
Posted by: coleslaw31 ()
Date: April 21, 2017 08:53AM

cnicol Wrote:
-------------------------------------------------------
> Another example of repurposed GM hardware. The
> magic here was to select a donor with the same
> engine specs as a Corvair so no programming
> required. Built in '99, the car still runs like a
> charm today... and it was a huge learning
> experience when I built it.


I assume you have a thread on that? Man that's slick looking.

South Carolina Upstate



68 Monza convertible 140 4spd A/C (coming soon)
66 Corsa coupe 140 4spd

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Re: Super low cost FI?
Posted by: cnicol ()
Date: April 21, 2017 09:13AM

coleslaw31 Wrote:
-------------------------------------------------------
I assume you have a thread on that? Man that's slick looking.

Thanks!
Here's a link to the project (and others) Click here

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: Super low cost FI?
Posted by: 66vairman ()
Date: April 21, 2017 09:46AM

vwbussman66 - Mechanical engineering is a big discipline as someone stated here.

An EFI project is a combination of mechanical and electrical knowledge, common now.

You'll do well if you learn BOTH disciplines. There was, and still is, a shortage of engineers that can handle both sides and integrate them.

Good luck with your project.

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Re: Super low cost FI?
Posted by: veverlove ()
Date: April 21, 2017 09:37PM

Craig - Just checked your link and that is one very clean installation on your Fiero EFI set-up. thumbs up

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Re: Super low cost FI?
Posted by: davemotohead ()
Date: April 21, 2017 10:42PM

There just doesn't seem to be anything left to say after all that!confused smiley ?





Email me at: Dave Motohead

Sign my guest book!
[motoheadmall.com]
-----------------------------------
Rust Free Lancaster Ca

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Re: Super low cost FI?
Posted by: toms73novass ()
Date: April 22, 2017 07:53AM

davemotohead Wrote:
-------------------------------------------------------
> There just doesn't seem to be anything left to say
> after all that!confused smiley ?

Dave, you asked for it! grinning smiley

-Tom


63' Monza Spyder Convertable (in process)
73' NovaSS 454 Big block
86' BMW 325es
98' Dodge 2500 12v Cummins Diesel with 1200 lb torque!
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo

NFCC
Grand Island, NY

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Re: Super low cost FI?
Posted by: Spectre ()
Date: April 22, 2017 09:33AM

Couldn't resist...

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Oklahoma City, OK

Click for Oklahoma City, Oklahoma Forecast

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Re: Super low cost FI?
Posted by: veverlove ()
Date: April 22, 2017 11:51AM

Dave, You did invite j3m to come out of his cave. Never mess with Trolls, if you don't want to smell their bad breath.

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Re: Super low cost FI?
Posted by: davemotohead ()
Date: April 22, 2017 12:03PM

He would have showed up even if I did not invite him, all it takes is a mention of Carbs or Fool Injection and BAM! j3m.





Email me at: Dave Motohead

Sign my guest book!
[motoheadmall.com]
-----------------------------------
Rust Free Lancaster Ca

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Re: Super low cost FI?
Posted by: Phil Dally ()
Date: April 22, 2017 12:15PM

You're my HERO Moto!!!

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Re: Super low cost FI?
Posted by: vwbusman66 ()
Date: April 22, 2017 01:01PM

Thread drift....


ANYWHO...
I got home yesterday and was able to spend a few hours playing with some C++ on my laptop and had something pretty basic written up. I have an Arduino and some other basic electronic components, so I schemed out a small test. I was able to make a LED flash at a varied interval based on a value declared by a potentiometer.

I also was able to add a section of code to display an O2 sensor reading in mV on an LCD. I think my plan is to have everything be adjustable like a carburetor- set the AF ratio based on a user-set idle speed on the throttle body butterfly. Then, once they know what the correct value of the pot is, they can set that as the minimum idle with a collar attached to the butterfly shaft.

I was able to simulate opening a throttle body and increasing the fuel flow to the engine. My LED can only pulse so fast, so I will need to get a real injector and TPS to start figuring out what comes next. I think I am planning to have a single throttle body mounted above the fan, with an injector mounted in a manifold (made by me) for each cylinder bank. I am thinking of making something similar to the system below, with a TB instead of a baseplate and carb.



I am concerned that the Arduino will not be able to pulse fast enough at 6000RPM. Apparently, my UNO is rated for 16MHZ. I am going to order a few 555 chips (MOSFET and analog) along with some transistors and better potentiometers to see if I can use a non-programmable system to build all of this. The lack of code may make things easier.

I also have a list of some tentative costs for a full system:
Bosch O2 sensor- $12
Fuel pump- $76
Fuel pressure regulator- $76
555 timer- $0.48
LCD display- $7
TB- ???
Manifold- ???

-------------
James Keller
Kingsville, MD (21087)
Currently Corvair-less but on the hunt

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Re: Super low cost FI?
Posted by: cnicol ()
Date: April 22, 2017 01:29PM

Sequential injection was created for emissions control. Batch-fire and TBI systemu DO NOT have to match engine RPM; in fact there's no relationship.

For those approaches, all you need to do is to alter the duty cycle at a fixed frequency. Just remember the injector duty cycle has upper an lower limits. (too short on-time and the injector doesn't open, too long and it overheats)

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Current Page: 2 of 3


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