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  #81  
Old 02-26-2017, 08:50 AM
babywag's Avatar
babywag babywag is offline
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Location: Land of froot loops and cukcoo-nuts, CA
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Every engine is a little different, you'll need to play/experiment with settings.
Generally the things that need attention are cold start, accel, and hot restart.
Dunno what Fitch calls these, but the AMC engines I've tuned all needed a little tweak.

I'd ditch those worm style hose clamps, get some real FI clamps on there.
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
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  #82  
Old 05-14-2017, 09:09 AM
ShagWagon ShagWagon is offline
350 Buick
 
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Location: Oregon Coast
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Quick question on AFR settings.

I ran a tank of gas through it and got like 8.3mpg on the new rebuild. A lot of it is idling and working on it so I expected it to be low, but not that bad....

I can change the settings on it which aren't 14.1-14.7 I think it's defaulted to low 13s target AFR on the dashboard without running out and checking. But it goes 14.1-14.7 while cruising.

I have to go to a different menu under tuning to change em. Then reset to save.

Question is that there's three different AFR settings

One for idle
One for WOT
One for Cruising

Are those all to be set the same at 14.7, or do I want a different AFR setting for each scenario?

Thanks ^^
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  #83  
Old 05-14-2017, 10:56 AM
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babywag babywag is offline
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No, not all same.

Just my .02...

Idle I'd play around to find best lean idle w/ vacuum reading ~14.7
Cruise I'd go for lean 14.7-15.0 reading plugs after good hwy cruise helps.
WOT 13.8 or lower mine likes ~13.5

8 is pretty normal mpg for what you described.
16 is what I have gotten w/ lean hwy only crusing tune.
12 is avg. CITY mpg if I drive like an old lady.
9 is avg. CITY mpg if I drive like me.
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
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  #84  
Old 05-14-2017, 12:13 PM
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DarkMonohue DarkMonohue is offline
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Join Date: Jul 01, 2012
Location: PNW
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Quote:
Originally Posted by ShagWagon
Question is that there's three different AFR settings

One for idle
One for WOT
One for Cruising

Are those all to be set the same at 14.7..?
No, definitely not.

A three-stage map sounded too simple to be effective, so I did a quick Google search to get a better grip on how it actually works. Fitech actually covers this in their instructions:
http://fitechefi.com/tech-posts/fite...-instructions/

That should clarificate it for you. You may, once you learn more about what engines need and want, start playing around with different AFRs. I've gone as lean as 17:1 equivalent at low load cruise, when burning E85, and in a very different vehicle. But I was willing to risk mechanical damage and capable of correcting it if it occurred.

One tank full of fuel isn't enough for a good mileage figure, especially if you've been tuning and idling and futzing around. Concentrate on getting it tuned correctly and see what the mileage looks like when you're driving it normally. Three tanks of fuel is about enough to get a good average.
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Last edited by DarkMonohue : 05-14-2017 at 12:20 PM.
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