[Diy_efi] Air/Fuel meter now working! And L-jetronic

[James Seabolt]

At 03:46 PM 6/16/05, you wrote:
>--- James Seabolt <turbofiat at hotpop.com> wrote:
>
> > I built a custom turbo system about 8 years ago for
> > my Fiat Spider and it uses L-jet. It works great for
> > 7# systems.
>
>You used the flapper-type VAF?


Yes.

>How did you determine
>plenum air pressure?

Not sure what your talking about.


>How much boost did you run?

I run just 7 pounds and about 5? retard. Will sort of. You'll have to read 
my whole page about how I have my boost retard system setup.

Here's the dyno results. Notice that the fuel mixture stays constant until 
I hit 4600 rpms then it starts to gradually lean out. I've heard this is 
where the AFM maxxes out at. It looks to me like this is more RPM related 
than boost related.

http://users.chartertn.net/jseabolt/2nddyno.jpg

http://users.chartertn.net/jseabolt/80spider.htm


>You've piqued my curiosity.  I'm only familiar with
>one L-Jet style application on an OE turbo vehicle,
>and that was very low-boost, and retarded ignition
>timing as boost built.


7# of boost gives this little car quite a kick. I put a 4.11:1 final drive 
it in so that helps it even more. But not for acceleration. Before putting 
the turbo on the pinion gear broke in the original 3:90 final drive. I had 
this spare axle laying around and stuck it in.

The drivetrain is all stock in this car. So far I haven't busted anything. 
It's real hard to find stronger components for these old Fiats these days. 
There is no way I could push 14# of boost in this car and not break something.






James Seabolt
Tennessee, United States
Homepage --->>> http://users.chartertn.net/jseabolt/

2003 Subaru Baja
1980 FIAT 2000 "turbo" Spider
1968 Ford Fairlane 500 (Not a Ford Galaxie!!)
1987 Yugo GV 1500cc also turbocharged









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