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Underbody braces, turbos and more!

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PostPosted: Thu Feb 11, 2016 9:19 pm 

Joined: Tue Aug 28, 2007 12:33 pm
Posts: 264
Location: yuma, AZ.
okay, so i went with a DIY computer on my 86 sprint. stock carb, missing the throttle switches and the choke (dont ask about the choke. im a dumbass. :oops: )

right now im using the throttle switch from a 90 geo, idle, cruise and WOT. idle position is larger than the stock idle switch.
currently running an Arduino pro mini, with a TIP 120 on the MCS, and a 7805 regulator. using an El Cheapo wideband o2 feeding into the arduino. i also have a tach input, but its not tested or used. keep in mind i go super rich comming off idle. it takes a 10 seconds or so at idle to get back to 15-16.

the next version of the computer will use wbo2, mcs, fcs, idle solinoid, and a real throttle position sensor.

MPG before rebuild with all stock carb, minus 3 way vaccum switch for the smog equipment:
35-40 in town.
37 freeway (80 mph)

current AF ratio:
idle: 15-16
cruise (sub 2500): 13.5-14.5
cruise (above 2500): 14-14.5
WOT (sub 2500): 10-11
WOT (2500 - 4000): 12-12.5
WOT 4000 - 6000): 12.5- 13.2

im starting this thread to keep a record of what ive been doing, the stock computer is the weak link in the mk1. the computer is build like a tank, but its still likely the first thing to go that can not be replaced.

Edit, current mpg in town is 32.

"muchos tanks, village destruidos"
"muchos sanks, menos submarinos"
"its the dreams that keep you alive"
-vernon wasser-

88 sprint, 4dr sold :(
87 turbo 2dr, never ran :( :(
86 sprint, 2dr current DD! :)

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