1967 Fiat 850 Coupe EFI and Electronic Ignition Project

X1/9 , 124 Coupe or Spider, 128, 131, or whatever your Fiat passion is. Talk about it here.
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stanz
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1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by stanz » Fri Mar 09, 2012 8:14 pm

I'm taking the plunge. I just picked up a MegaSquirt-I ECU Kit for my 1967 850
Coupe conversion. Since I won't be getting the car for a month I have time to
assemble it and get used to the software.

I got it from a guy who ran 20+ pounds of boost through his 38 year old head
gaskets and blew them. The kit was actually purchase in 2006 and never
assembled. Everything is still in the original bags waiting for solder. The
kit was purchased with stuff for a turbo engine so there's some "extra" parts I
won't need, it even came with the Stimulator kit to test the assembled unit and
get used to the tuning software.

Once I get going I'll document it here and 850 yahoo group. What I'm doing can
be done to most any old Fiat so FLU is the obvious place to share it.

Ignition will be done first and then the throttle body. Pretty much the same as
Trent's Sedan before the turbo. I'll use off-the-shelf stuff whenever possible
so that others can replicate the install. Obviously the throttle body will
require either a custom manifold or adapter plate. I have to search my
inventory to see what I have from other 850s/600s.

Stan in MA

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daled
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by daled » Thu Mar 15, 2012 8:25 am

sounds interesting...
as there is only one hole in the 850 head, i have to ask, is your kit a single injector? like a TBI injector?
71' 850 with (1.8L)
58? abarth 750
81' 124 (3.0L)

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stanz
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by stanz » Thu Mar 15, 2012 11:57 am

Dale,

There's no "kit" to make this happen. I will be using a throttle Body Injection system, probably from a Geo Metro.

The hardest part is going to be dealing with the 850 gas tank. At the least I need to pull it, clean it, and coat the insides. I may just replace it with an aluminum or plastic tank ... no more rust!

If you were referring to the Megasquirt kit, that's just the ECU, it's a universal engine control computer. You still need to add injector(s), ignition, and sensors. I have a wide band O2 sensor which will make the task MUCH easier. None of this is cheap but it should eliminate two trouble spots in an 850; ignition and fuel delivery. As an added bonus my fuel economy will improve, I'm figuring on around 50MPG since the carb gets around 40.
daled wrote:sounds interesting...
as there is only one hole in the 850 head, i have to ask, is your kit a single injector? like a TBI injector?

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stanz
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by stanz » Wed Apr 11, 2012 7:34 am

Quick update to the project ... my car finally arrived last Friday. It was full of spare parts, new and lightly used.

I put a battery into it Monday and it started right up once gas got into the carb. The exhaust is a bit louder than my last 850 which had a "Monza" exhaust. I'll have to take pictures of the exhaust. It's an unusual type that I have seen before but is not as popular as the Monza or Abarth styles.

Anyway, it runs but there's a problem with first ... it won't engage. Gotta fix that first. If I have to pull the tranny it will give me the opportunity to pull the gas tank!

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Chris Layton
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by Chris Layton » Wed Apr 11, 2012 10:18 am

I have fond memories of my 67 850 with a Monza exhast. The sound of a Ferrari with all the acceleration of a moped...great for staying out of trouble with the local police :)
Chris Layton (Forum Admin)
2012 Subaru Imprezza (Kid Transporter)
2005 Toyota MR2
2007 Lotus Elise
1981 124 Spider
1972 124 Spider (In pieces all across TN)

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stanz
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by stanz » Thu Apr 12, 2012 3:46 pm

Chris Layton wrote:I have fond memories of my 67 850 with a Monza exhast. The sound of a Ferrari with all the acceleration of a moped...great for staying out of trouble with the local police :)
C'mon Chris, they're not that bad. I remember my first 600, my step brother drove it home for me the first day and told me the engine was shot, it had no power. He was used to driving big Mopar V8s so he shifted the 600 at the same rev levels.

Well, I took him for a ride a couple days later and revved the crap out of it on blind country roads. He quickly changed his tune. Those little engines are useless until 4,000 RPM.

Oh, I managed to get first gear working. It wasn't anything to do with mounts or the linkage. Something was "stuck" in the tranny. I started the car and went from neutral to first with some force about 10-20 times until I heard the old familiar grind... first gear is back.

I don't know if the first gear syncro or thrust plate were jammed but I got it loose. It now shifts fine in the first three gears. It's not registered so I couldn't get it up to fourth gear on my little street.

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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by Chris Layton » Thu Apr 12, 2012 3:59 pm

I know it wasnt that bad. It was very fun to drive and kept me out of trouble. I really do enjoy driving slower cars fast vs fast cars slow :)
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2012 Subaru Imprezza (Kid Transporter)
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1981 124 Spider
1972 124 Spider (In pieces all across TN)

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stanz
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by stanz » Mon Apr 16, 2012 4:58 pm

Instead of hunting through boneyards for an EDIS 4 system I just picked one up on ebay for $75. The EDIS 4 system is ideal for a small Fiat conversion to distributorless ignition.

I got it from a seller that sells a lot of them and they're guaranteed.

seller: http://myworld.ebay.com/atomicjawbreaker

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racydave
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by racydave » Tue Apr 17, 2012 10:08 am

I run the Megajolt with a carbd set-up on my 124 and its great! It has to be a great improvment for any engine with a distributor. I hope you have a lap-top to set it up with, and some educated help to program it too!
1979 spider 2000

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stanz
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by stanz » Tue Apr 17, 2012 1:06 pm

I purchased a 2Ghz. tablet PC on ebay for $91, dedicated to this project.

I'm eliminating the distributor TOTALLY, no more points, condenser, rotor, or distributor cap to worry about. Just a 36 tooth wheel and sensor on the crank.

Trent has already done this on his 850 so I'm hoping he has some of his old settings before he upgraded to turbo.

The megasquirt controls both EFI and ignition. Even if the megasquirt dies the EDIS has a "limp home" feature, it can run standalone.

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stanz
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by stanz » Wed Apr 25, 2012 7:16 am

Chris Layton wrote:I have fond memories of my 67 850 with a Monza exhast. The sound of a Ferrari with all the acceleration of a moped...great for staying out of trouble with the local police :)
Wait a minute, that was my old car!

http://gallery.italiancarclub.com/124og ... 1.AVI.html

Yes, that's the sound I remember. I hated to sell it but I couldn't afford to fix it back then and I needed cash.

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stanz
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by stanz » Fri May 18, 2012 9:13 pm

I had some down time tonight, assembled my MegaStim kit. I sure wish I had my 20 year old eyes again. It's not the neatest solder job I've ever done but it will work.

Nice practice for the Megasquirt build. I think I'll get one of those magnifying head straps.

If you haven't soldered in a while, or you've never done it, I'd recommend buying the assembled kit. I'm working with a LOW budget so every penny counts.
Attachments
IMG_0764[1].JPG
Assembled MicroStim board

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Chris Layton
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by Chris Layton » Sun May 20, 2012 8:38 pm

Good to see you back in the 850 fold again Stan! Your old car was a great Fiat and I hated to sell it but I had to realize that owning it meant I wanted to drive it and after seeing it next to a H3 in traffic I figured a larger car might be safer :(

BTW your project looks very cool ! Cant wait to see it in action!
Chris Layton (Forum Admin)
2012 Subaru Imprezza (Kid Transporter)
2005 Toyota MR2
2007 Lotus Elise
1981 124 Spider
1972 124 Spider (In pieces all across TN)

mporlando
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by mporlando » Sun Feb 16, 2014 12:31 am

stan keep me updated im interested in the 850 project i justpicked up a 67 spider like my 69 72 was not enough! its a sickness it started with my dads 75 131 coupe i was not even yet born but growin up wit that car changed my perception of what a car should be!!

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mharrall
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Re: 1967 Fiat 850 Coupe EFI and Electronic Ignition Project

Post by mharrall » Sat Nov 29, 2014 10:45 am

Hi Stan how did converstion turn out i am about to embark on a project like this and would like to start lining up the parts needed. I am new to the FIAT world with my 71 spider
1971 Fiat 850 Spider

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